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Changes in 4.4.108
arm64: Initialise high_memory global variable earlier
cxl: Check if vphb exists before iterating over AFU devices
x86/mm: Add INVPCID helpers
x86/mm: Fix INVPCID asm constraint
x86/mm: Add a 'noinvpcid' boot option to turn off INVPCID
x86/mm: If INVPCID is available, use it to flush global mappings
mm/rmap: batched invalidations should use existing api
mm/mmu_context, sched/core: Fix mmu_context.h assumption
sched/core: Add switch_mm_irqs_off() and use it in the scheduler
x86/mm: Build arch/x86/mm/tlb.c even on !SMP
x86/mm, sched/core: Uninline switch_mm()
x86/mm, sched/core: Turn off IRQs in switch_mm()
ARM: Hide finish_arch_post_lock_switch() from modules
sched/core: Idle_task_exit() shouldn't use switch_mm_irqs_off()
x86/irq: Do not substract irq_tlb_count from irq_call_count
ALSA: hda - add support for docking station for HP 820 G2
ALSA: hda - add support for docking station for HP 840 G3
arm: kprobes: Fix the return address of multiple kretprobes
arm: kprobes: Align stack to 8-bytes in test code
cpuidle: Validate cpu_dev in cpuidle_add_sysfs()
r8152: fix the list rx_done may be used without initialization
crypto: deadlock between crypto_alg_sem/rtnl_mutex/genl_mutex
sch_dsmark: fix invalid skb_cow() usage
bna: integer overflow bug in debugfs
net: qmi_wwan: Add USB IDs for MDM6600 modem on Motorola Droid 4
usb: gadget: f_uvc: Sanity check wMaxPacketSize for SuperSpeed
usb: gadget: udc: remove pointer dereference after free
netfilter: nfnl_cthelper: fix runtime expectation policy updates
netfilter: nfnl_cthelper: Fix memory leak
inet: frag: release spinlock before calling icmp_send()
pinctrl: st: add irq_request/release_resources callbacks
scsi: lpfc: Fix PT2PT PRLI reject
KVM: x86: correct async page present tracepoint
KVM: VMX: Fix enable VPID conditions
ARM: dts: ti: fix PCI bus dtc warnings
hwmon: (asus_atk0110) fix uninitialized data access
HID: xinmo: fix for out of range for THT 2P arcade controller.
r8152: prevent the driver from transmitting packets with carrier off
s390/qeth: no ETH header for outbound AF_IUCV
bna: avoid writing uninitialized data into hw registers
net: Do not allow negative values for busy_read and busy_poll sysctl interfaces
i40e: Do not enable NAPI on q_vectors that have no rings
RDMA/iser: Fix possible mr leak on device removal event
irda: vlsi_ir: fix check for DMA mapping errors
netfilter: nfnl_cthelper: fix a race when walk the nf_ct_helper_hash table
netfilter: nf_nat_snmp: Fix panic when snmp_trap_helper fails to register
ARM: dts: am335x-evmsk: adjust mmc2 param to allow suspend
KVM: pci-assign: do not map smm memory slot pages in vt-d page tables
isdn: kcapi: avoid uninitialized data
xhci: plat: Register shutdown for xhci_plat
netfilter: nfnetlink_queue: fix secctx memory leak
ARM: dma-mapping: disallow dma_get_sgtable() for non-kernel managed memory
cpuidle: powernv: Pass correct drv->cpumask for registration
bnxt_en: Fix NULL pointer dereference in reopen failure path
backlight: pwm_bl: Fix overflow condition
crypto: crypto4xx - increase context and scatter ring buffer elements
rtc: pl031: make interrupt optional
net: phy: at803x: Change error to EINVAL for invalid MAC
PCI: Avoid bus reset if bridge itself is broken
scsi: cxgb4i: fix Tx skb leak
scsi: mpt3sas: Fix IO error occurs on pulling out a drive from RAID1 volume created on two SATA drive
PCI: Create SR-IOV virtfn/physfn links before attaching driver
igb: check memory allocation failure
ixgbe: fix use of uninitialized padding
PCI/AER: Report non-fatal errors only to the affected endpoint
scsi: lpfc: Fix secure firmware updates
scsi: lpfc: PLOGI failures during NPIV testing
fm10k: ensure we process SM mbx when processing VF mbx
tcp: fix under-evaluated ssthresh in TCP Vegas
rtc: set the alarm to the next expiring timer
cpuidle: fix broadcast control when broadcast can not be entered
thermal: hisilicon: Handle return value of clk_prepare_enable
MIPS: math-emu: Fix final emulation phase for certain instructions
Revert "Bluetooth: btusb: driver to enable the usb-wakeup feature"
ALSA: hda - Clear the leftover component assignment at snd_hdac_i915_exit()
ALSA: hda - Degrade i915 binding failure message
ALSA: hda - Fix yet another i915 pointer leftover in error path
alpha: fix build failures
Linux 4.4.108
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
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commit 252d2a4117bc181b287eeddf848863788da733ae upstream.
idle_task_exit() can be called with IRQs on x86 on and therefore
should use switch_mm(), not switch_mm_irqs_off().
This doesn't seem to cause any problems right now, but it will
confuse my upcoming TLB flush changes. Nonetheless, I think it
should be backported because it's trivial. There won't be any
meaningful performance impact because idle_task_exit() is only
used when offlining a CPU.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Fixes: f98db6013c55 ("sched/core: Add switch_mm_irqs_off() and use it in the scheduler")
Link: http://lkml.kernel.org/r/ca3d1a9fa93a0b49f5a8ff729eda3640fb6abdf9.1497034141.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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commit f98db6013c557c216da5038d9c52045be55cd039 upstream.
By default, this is the same thing as switch_mm().
x86 will override it as an optimization.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Reviewed-by: Borislav Petkov <bp@suse.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/df401df47bdd6be3e389c6f1e3f5310d70e81b2c.1461688545.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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* refs/heads/tmp-79f138a
Linux 4.4.107
ath9k: fix tx99 potential info leak
IB/ipoib: Grab rtnl lock on heavy flush when calling ndo_open/stop
RDMA/cma: Avoid triggering undefined behavior
macvlan: Only deliver one copy of the frame to the macvlan interface
udf: Avoid overflow when session starts at large offset
scsi: bfa: integer overflow in debugfs
scsi: sd: change allow_restart to bool in sysfs interface
scsi: sd: change manage_start_stop to bool in sysfs interface
vt6655: Fix a possible sleep-in-atomic bug in vt6655_suspend
scsi: scsi_devinfo: Add REPORTLUN2 to EMC SYMMETRIX blacklist entry
raid5: Set R5_Expanded on parity devices as well as data.
pinctrl: adi2: Fix Kconfig build problem
usb: musb: da8xx: fix babble condition handling
tty fix oops when rmmod 8250
powerpc/perf/hv-24x7: Fix incorrect comparison in memord
scsi: hpsa: destroy sas transport properties before scsi_host
scsi: hpsa: cleanup sas_phy structures in sysfs when unloading
PCI: Detach driver before procfs & sysfs teardown on device remove
xfs: fix incorrect extent state in xfs_bmap_add_extent_unwritten_real
xfs: fix log block underflow during recovery cycle verification
l2tp: cleanup l2tp_tunnel_delete calls
bcache: fix wrong cache_misses statistics
bcache: explicitly destroy mutex while exiting
GFS2: Take inode off order_write list when setting jdata flag
thermal/drivers/step_wise: Fix temperature regulation misbehavior
ppp: Destroy the mutex when cleanup
clk: tegra: Fix cclk_lp divisor register
clk: imx6: refine hdmi_isfr's parent to make HDMI work on i.MX6 SoCs w/o VPU
clk: mediatek: add the option for determining PLL source clock
mm: Handle 0 flags in _calc_vm_trans() macro
crypto: tcrypt - fix buffer lengths in test_aead_speed()
arm-ccn: perf: Prevent module unload while PMU is in use
target/file: Do not return error for UNMAP if length is zero
target:fix condition return in core_pr_dump_initiator_port()
iscsi-target: fix memory leak in lio_target_tiqn_addtpg()
target/iscsi: Fix a race condition in iscsit_add_reject_from_cmd()
powerpc/ipic: Fix status get and status clear
powerpc/opal: Fix EBUSY bug in acquiring tokens
netfilter: ipvs: Fix inappropriate output of procfs
powerpc/powernv/cpufreq: Fix the frequency read by /proc/cpuinfo
PCI/PME: Handle invalid data when reading Root Status
dmaengine: ti-dma-crossbar: Correct am335x/am43xx mux value type
rtc: pcf8563: fix output clock rate
video: fbdev: au1200fb: Return an error code if a memory allocation fails
video: fbdev: au1200fb: Release some resources if a memory allocation fails
video: udlfb: Fix read EDID timeout
fbdev: controlfb: Add missing modes to fix out of bounds access
sfc: don't warn on successful change of MAC
target: fix race during implicit transition work flushes
target: fix ALUA transition timeout handling
target: Use system workqueue for ALUA transitions
btrfs: add missing memset while reading compressed inline extents
NFSv4.1 respect server's max size in CREATE_SESSION
efi/esrt: Cleanup bad memory map log messages
perf symbols: Fix symbols__fixup_end heuristic for corner cases
net/mlx4_core: Avoid delays during VF driver device shutdown
afs: Fix afs_kill_pages()
afs: Fix page leak in afs_write_begin()
afs: Populate and use client modification time
afs: Fix the maths in afs_fs_store_data()
afs: Prevent callback expiry timer overflow
afs: Migrate vlocation fields to 64-bit
afs: Flush outstanding writes when an fd is closed
afs: Adjust mode bits processing
afs: Populate group ID from vnode status
afs: Fix missing put_page()
drm/radeon: reinstate oland workaround for sclk
mmc: mediatek: Fixed bug where clock frequency could be set wrong
sched/deadline: Use deadline instead of period when calculating overflow
sched/deadline: Throttle a constrained deadline task activated after the deadline
sched/deadline: Make sure the replenishment timer fires in the next period
drm/radeon/si: add dpm quirk for Oland
fjes: Fix wrong netdevice feature flags
scsi: hpsa: limit outstanding rescans
scsi: hpsa: update check for logical volume status
openrisc: fix issue handling 8 byte get_user calls
intel_th: pci: Add Gemini Lake support
mlxsw: reg: Fix SPVMLR max record count
mlxsw: reg: Fix SPVM max record count
net: Resend IGMP memberships upon peer notification.
dmaengine: Fix array index out of bounds warning in __get_unmap_pool()
net: wimax/i2400m: fix NULL-deref at probe
writeback: fix memory leak in wb_queue_work()
netfilter: bridge: honor frag_max_size when refragmenting
drm/omap: fix dmabuf mmap for dma_alloc'ed buffers
Input: i8042 - add TUXEDO BU1406 (N24_25BU) to the nomux list
NFSD: fix nfsd_reset_versions for NFSv4.
NFSD: fix nfsd_minorversion(.., NFSD_AVAIL)
net: bcmgenet: Power up the internal PHY before probing the MII
net: bcmgenet: power down internal phy if open or resume fails
net: bcmgenet: reserved phy revisions must be checked first
net: bcmgenet: correct MIB access of UniMAC RUNT counters
net: bcmgenet: correct the RBUF_OVFL_CNT and RBUF_ERR_CNT MIB values
net: initialize msg.msg_flags in recvfrom
userfaultfd: selftest: vm: allow to build in vm/ directory
userfaultfd: shmem: __do_fault requires VM_FAULT_NOPAGE
md-cluster: free md_cluster_info if node leave cluster
usb: phy: isp1301: Add OF device ID table
mac80211: Fix addition of mesh configuration element
KEYS: add missing permission check for request_key() destination
ext4: fix crash when a directory's i_size is too small
ext4: fix fdatasync(2) after fallocate(2) operation
dmaengine: dmatest: move callback wait queue to thread context
sched/rt: Do not pull from current CPU if only one CPU to pull
xhci: Don't add a virt_dev to the devs array before it's fully allocated
Bluetooth: btusb: driver to enable the usb-wakeup feature
ceph: drop negative child dentries before try pruning inode's alias
usbip: fix stub_send_ret_submit() vulnerability to null transfer_buffer
USB: core: prevent malicious bNumInterfaces overflow
USB: uas and storage: Add US_FL_BROKEN_FUA for another JMicron JMS567 ID
tracing: Allocate mask_str buffer dynamically
autofs: fix careless error in recent commit
crypto: salsa20 - fix blkcipher_walk API usage
crypto: hmac - require that the underlying hash algorithm is unkeyed
UPSTREAM: arm64: setup: introduce kaslr_offset()
UPSTREAM: kcov: fix comparison callback signature
UPSTREAM: kcov: support comparison operands collection
UPSTREAM: kcov: remove pointless current != NULL check
UPSTREAM: kcov: support compat processes
UPSTREAM: kcov: simplify interrupt check
UPSTREAM: kcov: make kcov work properly with KASLR enabled
UPSTREAM: kcov: add more missing includes
UPSTREAM: kcov: add missing #include <linux/sched.h>
UPSTREAM: kcov: properly check if we are in an interrupt
UPSTREAM: kcov: don't profile branches in kcov
UPSTREAM: kcov: don't trace the code coverage code
BACKPORT: kernel: add kcov code coverage
Conflicts:
Makefile
mm/kasan/Makefile
scripts/Makefile.lib
Change-Id: Ic19953706ea2e700621b0ba94d1c90bbffa4f471
Signed-off-by: Srinivasarao P <spathi@codeaurora.org>
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Changes in 4.4.107
crypto: hmac - require that the underlying hash algorithm is unkeyed
crypto: salsa20 - fix blkcipher_walk API usage
autofs: fix careless error in recent commit
tracing: Allocate mask_str buffer dynamically
USB: uas and storage: Add US_FL_BROKEN_FUA for another JMicron JMS567 ID
USB: core: prevent malicious bNumInterfaces overflow
usbip: fix stub_send_ret_submit() vulnerability to null transfer_buffer
ceph: drop negative child dentries before try pruning inode's alias
Bluetooth: btusb: driver to enable the usb-wakeup feature
xhci: Don't add a virt_dev to the devs array before it's fully allocated
sched/rt: Do not pull from current CPU if only one CPU to pull
dmaengine: dmatest: move callback wait queue to thread context
ext4: fix fdatasync(2) after fallocate(2) operation
ext4: fix crash when a directory's i_size is too small
KEYS: add missing permission check for request_key() destination
mac80211: Fix addition of mesh configuration element
usb: phy: isp1301: Add OF device ID table
md-cluster: free md_cluster_info if node leave cluster
userfaultfd: shmem: __do_fault requires VM_FAULT_NOPAGE
userfaultfd: selftest: vm: allow to build in vm/ directory
net: initialize msg.msg_flags in recvfrom
net: bcmgenet: correct the RBUF_OVFL_CNT and RBUF_ERR_CNT MIB values
net: bcmgenet: correct MIB access of UniMAC RUNT counters
net: bcmgenet: reserved phy revisions must be checked first
net: bcmgenet: power down internal phy if open or resume fails
net: bcmgenet: Power up the internal PHY before probing the MII
NFSD: fix nfsd_minorversion(.., NFSD_AVAIL)
NFSD: fix nfsd_reset_versions for NFSv4.
Input: i8042 - add TUXEDO BU1406 (N24_25BU) to the nomux list
drm/omap: fix dmabuf mmap for dma_alloc'ed buffers
netfilter: bridge: honor frag_max_size when refragmenting
writeback: fix memory leak in wb_queue_work()
net: wimax/i2400m: fix NULL-deref at probe
dmaengine: Fix array index out of bounds warning in __get_unmap_pool()
net: Resend IGMP memberships upon peer notification.
mlxsw: reg: Fix SPVM max record count
mlxsw: reg: Fix SPVMLR max record count
intel_th: pci: Add Gemini Lake support
openrisc: fix issue handling 8 byte get_user calls
scsi: hpsa: update check for logical volume status
scsi: hpsa: limit outstanding rescans
fjes: Fix wrong netdevice feature flags
drm/radeon/si: add dpm quirk for Oland
sched/deadline: Make sure the replenishment timer fires in the next period
sched/deadline: Throttle a constrained deadline task activated after the deadline
sched/deadline: Use deadline instead of period when calculating overflow
mmc: mediatek: Fixed bug where clock frequency could be set wrong
drm/radeon: reinstate oland workaround for sclk
afs: Fix missing put_page()
afs: Populate group ID from vnode status
afs: Adjust mode bits processing
afs: Flush outstanding writes when an fd is closed
afs: Migrate vlocation fields to 64-bit
afs: Prevent callback expiry timer overflow
afs: Fix the maths in afs_fs_store_data()
afs: Populate and use client modification time
afs: Fix page leak in afs_write_begin()
afs: Fix afs_kill_pages()
net/mlx4_core: Avoid delays during VF driver device shutdown
perf symbols: Fix symbols__fixup_end heuristic for corner cases
efi/esrt: Cleanup bad memory map log messages
NFSv4.1 respect server's max size in CREATE_SESSION
btrfs: add missing memset while reading compressed inline extents
target: Use system workqueue for ALUA transitions
target: fix ALUA transition timeout handling
target: fix race during implicit transition work flushes
sfc: don't warn on successful change of MAC
fbdev: controlfb: Add missing modes to fix out of bounds access
video: udlfb: Fix read EDID timeout
video: fbdev: au1200fb: Release some resources if a memory allocation fails
video: fbdev: au1200fb: Return an error code if a memory allocation fails
rtc: pcf8563: fix output clock rate
dmaengine: ti-dma-crossbar: Correct am335x/am43xx mux value type
PCI/PME: Handle invalid data when reading Root Status
powerpc/powernv/cpufreq: Fix the frequency read by /proc/cpuinfo
netfilter: ipvs: Fix inappropriate output of procfs
powerpc/opal: Fix EBUSY bug in acquiring tokens
powerpc/ipic: Fix status get and status clear
target/iscsi: Fix a race condition in iscsit_add_reject_from_cmd()
iscsi-target: fix memory leak in lio_target_tiqn_addtpg()
target:fix condition return in core_pr_dump_initiator_port()
target/file: Do not return error for UNMAP if length is zero
arm-ccn: perf: Prevent module unload while PMU is in use
crypto: tcrypt - fix buffer lengths in test_aead_speed()
mm: Handle 0 flags in _calc_vm_trans() macro
clk: mediatek: add the option for determining PLL source clock
clk: imx6: refine hdmi_isfr's parent to make HDMI work on i.MX6 SoCs w/o VPU
clk: tegra: Fix cclk_lp divisor register
ppp: Destroy the mutex when cleanup
thermal/drivers/step_wise: Fix temperature regulation misbehavior
GFS2: Take inode off order_write list when setting jdata flag
bcache: explicitly destroy mutex while exiting
bcache: fix wrong cache_misses statistics
l2tp: cleanup l2tp_tunnel_delete calls
xfs: fix log block underflow during recovery cycle verification
xfs: fix incorrect extent state in xfs_bmap_add_extent_unwritten_real
PCI: Detach driver before procfs & sysfs teardown on device remove
scsi: hpsa: cleanup sas_phy structures in sysfs when unloading
scsi: hpsa: destroy sas transport properties before scsi_host
powerpc/perf/hv-24x7: Fix incorrect comparison in memord
tty fix oops when rmmod 8250
usb: musb: da8xx: fix babble condition handling
pinctrl: adi2: Fix Kconfig build problem
raid5: Set R5_Expanded on parity devices as well as data.
scsi: scsi_devinfo: Add REPORTLUN2 to EMC SYMMETRIX blacklist entry
vt6655: Fix a possible sleep-in-atomic bug in vt6655_suspend
scsi: sd: change manage_start_stop to bool in sysfs interface
scsi: sd: change allow_restart to bool in sysfs interface
scsi: bfa: integer overflow in debugfs
udf: Avoid overflow when session starts at large offset
macvlan: Only deliver one copy of the frame to the macvlan interface
RDMA/cma: Avoid triggering undefined behavior
IB/ipoib: Grab rtnl lock on heavy flush when calling ndo_open/stop
ath9k: fix tx99 potential info leak
Linux 4.4.107
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
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[ Upstream commit 2317d5f1c34913bac5971d93d69fb6c31bb74670 ]
I was testing Daniel's changes with his test case, and tweaked it a
little. Instead of having the runtime equal to the deadline, I
increased the deadline ten fold.
Daniel's test case had:
attr.sched_runtime = 2 * 1000 * 1000; /* 2 ms */
attr.sched_deadline = 2 * 1000 * 1000; /* 2 ms */
attr.sched_period = 2 * 1000 * 1000 * 1000; /* 2 s */
To make it more interesting, I changed it to:
attr.sched_runtime = 2 * 1000 * 1000; /* 2 ms */
attr.sched_deadline = 20 * 1000 * 1000; /* 20 ms */
attr.sched_period = 2 * 1000 * 1000 * 1000; /* 2 s */
The results were rather surprising. The behavior that Daniel's patch
was fixing came back. The task started using much more than .1% of the
CPU. More like 20%.
Looking into this I found that it was due to the dl_entity_overflow()
constantly returning true. That's because it uses the relative period
against relative runtime vs the absolute deadline against absolute
runtime.
runtime / (deadline - t) > dl_runtime / dl_period
There's even a comment mentioning this, and saying that when relative
deadline equals relative period, that the equation is the same as using
deadline instead of period. That comment is backwards! What we really
want is:
runtime / (deadline - t) > dl_runtime / dl_deadline
We care about if the runtime can make its deadline, not its period. And
then we can say "when the deadline equals the period, the equation is
the same as using dl_period instead of dl_deadline".
After correcting this, now when the task gets enqueued, it can throttle
correctly, and Daniel's fix to the throttling of sleeping deadline
tasks works even when the runtime and deadline are not the same.
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Daniel Bristot de Oliveira <bristot@redhat.com>
Cc: Juri Lelli <juri.lelli@arm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Luca Abeni <luca.abeni@santannapisa.it>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Romulo Silva de Oliveira <romulo.deoliveira@ufsc.br>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tommaso Cucinotta <tommaso.cucinotta@sssup.it>
Link: http://lkml.kernel.org/r/02135a27f1ae3fe5fd032568a5a2f370e190e8d7.1488392936.git.bristot@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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deadline
[ Upstream commit df8eac8cafce7d086be3bd5cf5a838fa37594dfb ]
During the activation, CBS checks if it can reuse the current task's
runtime and period. If the deadline of the task is in the past, CBS
cannot use the runtime, and so it replenishes the task. This rule
works fine for implicit deadline tasks (deadline == period), and the
CBS was designed for implicit deadline tasks. However, a task with
constrained deadline (deadine < period) might be awakened after the
deadline, but before the next period. In this case, replenishing the
task would allow it to run for runtime / deadline. As in this case
deadline < period, CBS enables a task to run for more than the
runtime / period. In a very loaded system, this can cause a domino
effect, making other tasks miss their deadlines.
To avoid this problem, in the activation of a constrained deadline
task after the deadline but before the next period, throttle the
task and set the replenishing timer to the begin of the next period,
unless it is boosted.
Reproducer:
--------------- %< ---------------
int main (int argc, char **argv)
{
int ret;
int flags = 0;
unsigned long l = 0;
struct timespec ts;
struct sched_attr attr;
memset(&attr, 0, sizeof(attr));
attr.size = sizeof(attr);
attr.sched_policy = SCHED_DEADLINE;
attr.sched_runtime = 2 * 1000 * 1000; /* 2 ms */
attr.sched_deadline = 2 * 1000 * 1000; /* 2 ms */
attr.sched_period = 2 * 1000 * 1000 * 1000; /* 2 s */
ts.tv_sec = 0;
ts.tv_nsec = 2000 * 1000; /* 2 ms */
ret = sched_setattr(0, &attr, flags);
if (ret < 0) {
perror("sched_setattr");
exit(-1);
}
for(;;) {
/* XXX: you may need to adjust the loop */
for (l = 0; l < 150000; l++);
/*
* The ideia is to go to sleep right before the deadline
* and then wake up before the next period to receive
* a new replenishment.
*/
nanosleep(&ts, NULL);
}
exit(0);
}
--------------- >% ---------------
On my box, this reproducer uses almost 50% of the CPU time, which is
obviously wrong for a task with 2/2000 reservation.
Signed-off-by: Daniel Bristot de Oliveira <bristot@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Juri Lelli <juri.lelli@arm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Luca Abeni <luca.abeni@santannapisa.it>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Romulo Silva de Oliveira <romulo.deoliveira@ufsc.br>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tommaso Cucinotta <tommaso.cucinotta@sssup.it>
Link: http://lkml.kernel.org/r/edf58354e01db46bf42df8d2dd32418833f68c89.1488392936.git.bristot@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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[ Upstream commit 5ac69d37784b237707a7b15d199cdb6c6fdb6780 ]
Currently, the replenishment timer is set to fire at the deadline
of a task. Although that works for implicit deadline tasks because the
deadline is equals to the begin of the next period, that is not correct
for constrained deadline tasks (deadline < period).
For instance:
f.c:
--------------- %< ---------------
int main (void)
{
for(;;);
}
--------------- >% ---------------
# gcc -o f f.c
# trace-cmd record -e sched:sched_switch \
-e syscalls:sys_exit_sched_setattr \
chrt -d --sched-runtime 490000000 \
--sched-deadline 500000000 \
--sched-period 1000000000 0 ./f
# trace-cmd report | grep "{pid of ./f}"
After setting parameters, the task is replenished and continue running
until being throttled:
f-11295 [003] 13322.113776: sys_exit_sched_setattr: 0x0
The task is throttled after running 492318 ms, as expected:
f-11295 [003] 13322.606094: sched_switch: f:11295 [-1] R ==> watchdog/3:32 [0]
But then, the task is replenished 500719 ms after the first
replenishment:
<idle>-0 [003] 13322.614495: sched_switch: swapper/3:0 [120] R ==> f:11295 [-1]
Running for 490277 ms:
f-11295 [003] 13323.104772: sched_switch: f:11295 [-1] R ==> swapper/3:0 [120]
Hence, in the first period, the task runs 2 * runtime, and that is a bug.
During the first replenishment, the next deadline is set one period away.
So the runtime / period starts to be respected. However, as the second
replenishment took place in the wrong instant, the next replenishment
will also be held in a wrong instant of time. Rather than occurring in
the nth period away from the first activation, it is taking place
in the (nth period - relative deadline).
Signed-off-by: Daniel Bristot de Oliveira <bristot@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Luca Abeni <luca.abeni@santannapisa.it>
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Reviewed-by: Juri Lelli <juri.lelli@arm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Romulo Silva de Oliveira <romulo.deoliveira@ufsc.br>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tommaso Cucinotta <tommaso.cucinotta@sssup.it>
Link: http://lkml.kernel.org/r/ac50d89887c25285b47465638354b63362f8adff.1488392936.git.bristot@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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commit f73c52a5bcd1710994e53fbccc378c42b97a06b6 upstream.
Daniel Wagner reported a crash on the BeagleBone Black SoC.
This is a single CPU architecture, and does not have a functional
arch_send_call_function_single_ipi() implementation which can crash
the kernel if that is called.
As it only has one CPU, it shouldn't be called, but if the kernel is
compiled for SMP, the push/pull RT scheduling logic now calls it for
irq_work if the one CPU is overloaded, it can use that function to call
itself and crash the kernel.
Ideally, we should disable the SCHED_FEAT(RT_PUSH_IPI) if the system
only has a single CPU. But SCHED_FEAT is a constant if sched debugging
is turned off. Another fix can also be used, and this should also help
with normal SMP machines. That is, do not initiate the pull code if
there's only one RT overloaded CPU, and that CPU happens to be the
current CPU that is scheduling in a lower priority task.
Even on a system with many CPUs, if there's many RT tasks waiting to
run on a single CPU, and that CPU schedules in another RT task of lower
priority, it will initiate the PULL logic in case there's a higher
priority RT task on another CPU that is waiting to run. But if there is
no other CPU with waiting RT tasks, it will initiate the RT pull logic
on itself (as it still has RT tasks waiting to run). This is a wasted
effort.
Not only does this help with SMP code where the current CPU is the only
one with RT overloaded tasks, it should also solve the issue that
Daniel encountered, because it will prevent the PULL logic from
executing, as there's only one CPU on the system, and the check added
here will cause it to exit the RT pull code.
Reported-by: Daniel Wagner <wagi@monom.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-rt-users <linux-rt-users@vger.kernel.org>
Fixes: 4bdced5c9 ("sched/rt: Simplify the IPI based RT balancing logic")
Link: http://lkml.kernel.org/r/20171202130454.4cbbfe8d@vmware.local.home
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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kcov provides code coverage collection for coverage-guided fuzzing
(randomized testing). Coverage-guided fuzzing is a testing technique
that uses coverage feedback to determine new interesting inputs to a
system. A notable user-space example is AFL
(http://lcamtuf.coredump.cx/afl/). However, this technique is not
widely used for kernel testing due to missing compiler and kernel
support.
kcov does not aim to collect as much coverage as possible. It aims to
collect more or less stable coverage that is function of syscall inputs.
To achieve this goal it does not collect coverage in soft/hard
interrupts and instrumentation of some inherently non-deterministic or
non-interesting parts of kernel is disbled (e.g. scheduler, locking).
Currently there is a single coverage collection mode (tracing), but the
API anticipates additional collection modes. Initially I also
implemented a second mode which exposes coverage in a fixed-size hash
table of counters (what Quentin used in his original patch). I've
dropped the second mode for simplicity.
This patch adds the necessary support on kernel side. The complimentary
compiler support was added in gcc revision 231296.
We've used this support to build syzkaller system call fuzzer, which has
found 90 kernel bugs in just 2 months:
https://github.com/google/syzkaller/wiki/Found-Bugs
We've also found 30+ bugs in our internal systems with syzkaller.
Another (yet unexplored) direction where kcov coverage would greatly
help is more traditional "blob mutation". For example, mounting a
random blob as a filesystem, or receiving a random blob over wire.
Why not gcov. Typical fuzzing loop looks as follows: (1) reset
coverage, (2) execute a bit of code, (3) collect coverage, repeat. A
typical coverage can be just a dozen of basic blocks (e.g. an invalid
input). In such context gcov becomes prohibitively expensive as
reset/collect coverage steps depend on total number of basic
blocks/edges in program (in case of kernel it is about 2M). Cost of
kcov depends only on number of executed basic blocks/edges. On top of
that, kernel requires per-thread coverage because there are always
background threads and unrelated processes that also produce coverage.
With inlined gcov instrumentation per-thread coverage is not possible.
kcov exposes kernel PCs and control flow to user-space which is
insecure. But debugfs should not be mapped as user accessible.
Based on a patch by Quentin Casasnovas.
[akpm@linux-foundation.org: make task_struct.kcov_mode have type `enum kcov_mode']
[akpm@linux-foundation.org: unbreak allmodconfig]
[akpm@linux-foundation.org: follow x86 Makefile layout standards]
Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: syzkaller <syzkaller@googlegroups.com>
Cc: Vegard Nossum <vegard.nossum@oracle.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Tavis Ormandy <taviso@google.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com>
Cc: Kostya Serebryany <kcc@google.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Kees Cook <keescook@google.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Sasha Levin <sasha.levin@oracle.com>
Cc: David Drysdale <drysdale@google.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Kirill A. Shutemov <kirill@shutemov.name>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Bug: 64145065
(cherry-picked from 5c9a8750a6409c63a0f01d51a9024861022f6593)
Change-Id: I17b5e04f6e89b241924e78ec32ead79c38b860ce
Signed-off-by: Paul Lawrence <paullawrence@google.com>
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* refs/heads/tmp-2fea039
Linux 4.4.106
usb: gadget: ffs: Forbid usb_ep_alloc_request from sleeping
arm: KVM: Fix VTTBR_BADDR_MASK BUG_ON off-by-one
Revert "x86/mm/pat: Ensure cpa->pfn only contains page frame numbers"
Revert "x86/efi: Hoist page table switching code into efi_call_virt()"
Revert "x86/efi: Build our own page table structures"
net/packet: fix a race in packet_bind() and packet_notifier()
packet: fix crash in fanout_demux_rollover()
sit: update frag_off info
rds: Fix NULL pointer dereference in __rds_rdma_map
tipc: fix memory leak in tipc_accept_from_sock()
more bio_map_user_iov() leak fixes
s390: always save and restore all registers on context switch
ipmi: Stop timers before cleaning up the module
audit: ensure that 'audit=1' actually enables audit for PID 1
ipvlan: fix ipv6 outbound device
afs: Connect up the CB.ProbeUuid
IB/mlx5: Assign send CQ and recv CQ of UMR QP
IB/mlx4: Increase maximal message size under UD QP
xfrm: Copy policy family in clone_policy
jump_label: Invoke jump_label_test() via early_initcall()
atm: horizon: Fix irq release error
sctp: use the right sk after waking up from wait_buf sleep
sctp: do not free asoc when it is already dead in sctp_sendmsg
sparc64/mm: set fields in deferred pages
block: wake up all tasks blocked in get_request()
sunrpc: Fix rpc_task_begin trace point
NFS: Fix a typo in nfs_rename()
dynamic-debug-howto: fix optional/omitted ending line number to be LARGE instead of 0
lib/genalloc.c: make the avail variable an atomic_long_t
route: update fnhe_expires for redirect when the fnhe exists
route: also update fnhe_genid when updating a route cache
mac80211_hwsim: Fix memory leak in hwsim_new_radio_nl()
kbuild: pkg: use --transform option to prefix paths in tar
EDAC, i5000, i5400: Fix definition of NRECMEMB register
EDAC, i5000, i5400: Fix use of MTR_DRAM_WIDTH macro
powerpc/powernv/ioda2: Gracefully fail if too many TCE levels requested
drm/amd/amdgpu: fix console deadlock if late init failed
axonram: Fix gendisk handling
netfilter: don't track fragmented packets
zram: set physical queue limits to avoid array out of bounds accesses
i2c: riic: fix restart condition
crypto: s5p-sss - Fix completing crypto request in IRQ handler
ipv6: reorder icmpv6_init() and ip6_mr_init()
bnx2x: do not rollback VF MAC/VLAN filters we did not configure
bnx2x: fix possible overrun of VFPF multicast addresses array
bnx2x: prevent crash when accessing PTP with interface down
spi_ks8995: fix "BUG: key accdaa28 not in .data!"
arm64: KVM: Survive unknown traps from guests
arm: KVM: Survive unknown traps from guests
KVM: nVMX: reset nested_run_pending if the vCPU is going to be reset
irqchip/crossbar: Fix incorrect type of register size
scsi: lpfc: Fix crash during Hardware error recovery on SLI3 adapters
workqueue: trigger WARN if queue_delayed_work() is called with NULL @wq
libata: drop WARN from protocol error in ata_sff_qc_issue()
kvm: nVMX: VMCLEAR should not cause the vCPU to shut down
USB: gadgetfs: Fix a potential memory leak in 'dev_config()'
usb: gadget: configs: plug memory leak
HID: chicony: Add support for another ASUS Zen AiO keyboard
gpio: altera: Use handle_level_irq when configured as a level_high
ARM: OMAP2+: Release device node after it is no longer needed.
ARM: OMAP2+: Fix device node reference counts
module: set __jump_table alignment to 8
selftest/powerpc: Fix false failures for skipped tests
x86/hpet: Prevent might sleep splat on resume
ARM: OMAP2+: gpmc-onenand: propagate error on initialization failure
vti6: Don't report path MTU below IPV6_MIN_MTU.
Revert "s390/kbuild: enable modversions for symbols exported from asm"
Revert "spi: SPI_FSL_DSPI should depend on HAS_DMA"
Revert "drm/armada: Fix compile fail"
mm: drop unused pmdp_huge_get_and_clear_notify()
thp: fix MADV_DONTNEED vs. numa balancing race
thp: reduce indentation level in change_huge_pmd()
scsi: storvsc: Workaround for virtual DVD SCSI version
ARM: avoid faulting on qemu
ARM: BUG if jumping to usermode address in kernel mode
arm64: fpsimd: Prevent registers leaking from dead tasks
KVM: VMX: remove I/O port 0x80 bypass on Intel hosts
arm64: KVM: fix VTTBR_BADDR_MASK BUG_ON off-by-one
media: dvb: i2c transfers over usb cannot be done from stack
drm/exynos: gem: Drop NONCONTIG flag for buffers allocated without IOMMU
drm: extra printk() wrapper macros
kdb: Fix handling of kallsyms_symbol_next() return value
s390: fix compat system call table
iommu/vt-d: Fix scatterlist offset handling
ALSA: usb-audio: Add check return value for usb_string()
ALSA: usb-audio: Fix out-of-bound error
ALSA: seq: Remove spurious WARN_ON() at timer check
ALSA: pcm: prevent UAF in snd_pcm_info
x86/PCI: Make broadcom_postcore_init() check acpi_disabled
X.509: reject invalid BIT STRING for subjectPublicKey
ASN.1: check for error from ASN1_OP_END__ACT actions
ASN.1: fix out-of-bounds read when parsing indefinite length item
efi: Move some sysfs files to be read-only by root
scsi: libsas: align sata_device's rps_resp on a cacheline
isa: Prevent NULL dereference in isa_bus driver callbacks
hv: kvp: Avoid reading past allocated blocks from KVP file
virtio: release virtio index when fail to device_register
can: usb_8dev: cancel urb on -EPIPE and -EPROTO
can: esd_usb2: cancel urb on -EPIPE and -EPROTO
can: ems_usb: cancel urb on -EPIPE and -EPROTO
can: kvaser_usb: cancel urb on -EPIPE and -EPROTO
can: kvaser_usb: ratelimit errors if incomplete messages are received
can: kvaser_usb: Fix comparison bug in kvaser_usb_read_bulk_callback()
can: kvaser_usb: free buf in error paths
can: ti_hecc: Fix napi poll return value for repoll
BACKPORT: irq: Make the irqentry text section unconditional
UPSTREAM: arch, ftrace: for KASAN put hard/soft IRQ entries into separate sections
UPSTREAM: x86, kasan, ftrace: Put APIC interrupt handlers into .irqentry.text
UPSTREAM: kasan: make get_wild_bug_type() static
UPSTREAM: kasan: separate report parts by empty lines
UPSTREAM: kasan: improve double-free report format
UPSTREAM: kasan: print page description after stacks
UPSTREAM: kasan: improve slab object description
UPSTREAM: kasan: change report header
UPSTREAM: kasan: simplify address description logic
UPSTREAM: kasan: change allocation and freeing stack traces headers
UPSTREAM: kasan: unify report headers
UPSTREAM: kasan: introduce helper functions for determining bug type
BACKPORT: kasan: report only the first error by default
UPSTREAM: kasan: fix races in quarantine_remove_cache()
UPSTREAM: kasan: resched in quarantine_remove_cache()
BACKPORT: kasan, sched/headers: Uninline kasan_enable/disable_current()
BACKPORT: kasan: drain quarantine of memcg slab objects
UPSTREAM: kasan: eliminate long stalls during quarantine reduction
UPSTREAM: kasan: support panic_on_warn
UPSTREAM: x86/suspend: fix false positive KASAN warning on suspend/resume
UPSTREAM: kasan: support use-after-scope detection
UPSTREAM: kasan/tests: add tests for user memory access functions
UPSTREAM: mm, kasan: add a ksize() test
UPSTREAM: kasan: test fix: warn if the UAF could not be detected in kmalloc_uaf2
UPSTREAM: kasan: modify kmalloc_large_oob_right(), add kmalloc_pagealloc_oob_right()
UPSTREAM: lib/stackdepot: export save/fetch stack for drivers
UPSTREAM: lib/stackdepot.c: bump stackdepot capacity from 16MB to 128MB
BACKPORT: kprobes: Unpoison stack in jprobe_return() for KASAN
UPSTREAM: kasan: remove the unnecessary WARN_ONCE from quarantine.c
UPSTREAM: kasan: avoid overflowing quarantine size on low memory systems
UPSTREAM: kasan: improve double-free reports
BACKPORT: mm: coalesce split strings
BACKPORT: mm/kasan: get rid of ->state in struct kasan_alloc_meta
UPSTREAM: mm/kasan: get rid of ->alloc_size in struct kasan_alloc_meta
UPSTREAM: mm: kasan: remove unused 'reserved' field from struct kasan_alloc_meta
UPSTREAM: mm/kasan, slub: don't disable interrupts when object leaves quarantine
UPSTREAM: mm/kasan: don't reduce quarantine in atomic contexts
UPSTREAM: mm/kasan: fix corruptions and false positive reports
UPSTREAM: lib/stackdepot.c: use __GFP_NOWARN for stack allocations
BACKPORT: mm, kasan: switch SLUB to stackdepot, enable memory quarantine for SLUB
UPSTREAM: kasan/quarantine: fix bugs on qlist_move_cache()
UPSTREAM: mm: mempool: kasan: don't poot mempool objects in quarantine
UPSTREAM: kasan: change memory hot-add error messages to info messages
BACKPORT: mm/kasan: add API to check memory regions
UPSTREAM: mm/kasan: print name of mem[set,cpy,move]() caller in report
UPSTREAM: mm: kasan: initial memory quarantine implementation
UPSTREAM: lib/stackdepot: avoid to return 0 handle
UPSTREAM: lib/stackdepot.c: allow the stack trace hash to be zero
UPSTREAM: mm, kasan: fix compilation for CONFIG_SLAB
BACKPORT: mm, kasan: stackdepot implementation. Enable stackdepot for SLAB
BACKPORT: mm, kasan: add GFP flags to KASAN API
UPSTREAM: mm, kasan: SLAB support
UPSTREAM: mm/slab: align cache size first before determination of OFF_SLAB candidate
UPSTREAM: mm/slab: use more appropriate condition check for debug_pagealloc
UPSTREAM: mm/slab: factor out debugging initialization in cache_init_objs()
UPSTREAM: mm/slab: remove object status buffer for DEBUG_SLAB_LEAK
UPSTREAM: mm/slab: alternative implementation for DEBUG_SLAB_LEAK
UPSTREAM: mm/slab: clean up DEBUG_PAGEALLOC processing code
UPSTREAM: mm/slab: activate debug_pagealloc in SLAB when it is actually enabled
sched: EAS/WALT: Don't take into account of running task's util
BACKPORT: schedutil: Reset cached freq if it is not in sync with next_freq
UPSTREAM: kasan: add functions to clear stack poison
Conflicts:
arch/arm/include/asm/kvm_arm.h
arch/arm64/kernel/vmlinux.lds.S
include/linux/kasan.h
kernel/softirq.c
lib/Kconfig
lib/Kconfig.kasan
lib/Makefile
lib/stackdepot.c
mm/kasan/kasan.c
sound/usb/mixer.c
Change-Id: If70ced6da5f19be3dd92d10a8d8cd4d5841e5870
Signed-off-by: Srinivasarao P <spathi@codeaurora.org>
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For upmigrating misfit running task case, the currently running
task's util has been counted into cpu_util(). Thus currently
__cpu_overutilized() which add task's uitl twice is overestimated.
Signed-off-by: Ke Wang <ke.wang@spreadtrum.com>
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'cached_raw_freq' is used to get the next frequency quickly but should
always be in sync with sg_policy->next_freq. There are cases where it is
not and in such cases it should be reset to avoid switching to incorrect
frequencies.
Consider this case for example:
- policy->cur is 1.2 GHz (Max)
- New request comes for 780 MHz and we store that in cached_raw_freq.
- Based on 780 MHz, we calculate the effective frequency as 800 MHz.
- We then decide not to update the frequency as
sugov_up_down_rate_limit() return true.
- Here cached_raw_freq is 780 MHz and sg_policy->next_freq is 1.2 GHz.
- Now if the utilization doesn't change in next request, then the next
target frequency will still be 780 MHz and it will match with
cached_raw_freq and so we will directly return 1.2 GHz instead of 800
MHz.
BACKPORT of upstream commit 07458f6a5171 ("cpufreq: schedutil: Reset
cached_raw_freq when not in sync with next_freq").
This also updates sugov_update_commit() for handling up/down tunables, which
aren't present in mainline.
Change-Id: I70bca2c5dfdb545a0471d1c9e4c5addb30ab5494
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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* refs/heads/tmp-9fbf3d7
Linux 4.4.103
Revert "sctp: do not peel off an assoc from one netns to another one"
xen: xenbus driver must not accept invalid transaction ids
s390/kbuild: enable modversions for symbols exported from asm
ASoC: wm_adsp: Don't overrun firmware file buffer when reading region data
btrfs: return the actual error value from from btrfs_uuid_tree_iterate
ASoC: rsnd: don't double free kctrl
netfilter: nf_tables: fix oob access
netfilter: nft_queue: use raw_smp_processor_id()
spi: SPI_FSL_DSPI should depend on HAS_DMA
staging: iio: cdc: fix improper return value
iio: light: fix improper return value
mac80211: Suppress NEW_PEER_CANDIDATE event if no room
mac80211: Remove invalid flag operations in mesh TSF synchronization
drm: Apply range restriction after color adjustment when allocation
ALSA: hda - Apply ALC269_FIXUP_NO_SHUTUP on HDA_FIXUP_ACT_PROBE
ath10k: set CTS protection VDEV param only if VDEV is up
ath10k: fix potential memory leak in ath10k_wmi_tlv_op_pull_fw_stats()
ath10k: ignore configuring the incorrect board_id
ath10k: fix incorrect txpower set by P2P_DEVICE interface
drm/armada: Fix compile fail
net: 3com: typhoon: typhoon_init_one: fix incorrect return values
net: 3com: typhoon: typhoon_init_one: make return values more specific
net: Allow IP_MULTICAST_IF to set index to L3 slave
dmaengine: zx: set DMA_CYCLIC cap_mask bit
PCI: Apply _HPX settings only to relevant devices
RDS: RDMA: return appropriate error on rdma map failures
e1000e: Separate signaling for link check/link up
e1000e: Fix return value test
e1000e: Fix error path in link detection
PM / OPP: Add missing of_node_put(np)
net/9p: Switch to wait_event_killable()
fscrypt: lock mutex before checking for bounce page pool
sched/rt: Simplify the IPI based RT balancing logic
media: v4l2-ctrl: Fix flags field on Control events
cx231xx-cards: fix NULL-deref on missing association descriptor
media: rc: check for integer overflow
media: Don't do DMA on stack for firmware upload in the AS102 driver
powerpc/signal: Properly handle return value from uprobe_deny_signal()
parisc: Fix validity check of pointer size argument in new CAS implementation
ixgbe: Fix skb list corruption on Power systems
fm10k: Use smp_rmb rather than read_barrier_depends
i40evf: Use smp_rmb rather than read_barrier_depends
ixgbevf: Use smp_rmb rather than read_barrier_depends
igbvf: Use smp_rmb rather than read_barrier_depends
igb: Use smp_rmb rather than read_barrier_depends
i40e: Use smp_rmb rather than read_barrier_depends
NFC: fix device-allocation error return
IB/srp: Avoid that a cable pull can trigger a kernel crash
IB/srpt: Do not accept invalid initiator port names
libnvdimm, namespace: make 'resource' attribute only readable by root
libnvdimm, namespace: fix label initialization to use valid seq numbers
clk: ti: dra7-atl-clock: fix child-node lookups
clk: ti: dra7-atl-clock: Fix of_node reference counting
SUNRPC: Fix tracepoint storage issues with svc_recv and svc_rqst_status
KVM: SVM: obey guest PAT
KVM: nVMX: set IDTR and GDTR limits when loading L1 host state
target: Fix QUEUE_FULL + SCSI task attribute handling
iscsi-target: Fix non-immediate TMR reference leak
fs/9p: Compare qid.path in v9fs_test_inode
fix a page leak in vhost_scsi_iov_to_sgl() error recovery
ALSA: hda/realtek - Fix ALC700 family no sound issue
ALSA: timer: Remove kernel warning at compat ioctl error paths
ALSA: usb-audio: Add sanity checks in v2 clock parsers
ALSA: usb-audio: Fix potential out-of-bound access at parsing SU
ALSA: usb-audio: Add sanity checks to FE parser
ALSA: pcm: update tstamp only if audio_tstamp changed
ext4: fix interaction between i_size, fallocate, and delalloc after a crash
ata: fixes kernel crash while tracing ata_eh_link_autopsy event
rtlwifi: fix uninitialized rtlhal->last_suspend_sec time
rtlwifi: rtl8192ee: Fix memory leak when loading firmware
nfsd: deal with revoked delegations appropriately
nfs: Fix ugly referral attributes
NFS: Fix typo in nomigration mount option
isofs: fix timestamps beyond 2027
bcache: check ca->alloc_thread initialized before wake up it
eCryptfs: use after free in ecryptfs_release_messaging()
nilfs2: fix race condition that causes file system corruption
autofs: don't fail mount for transient error
MIPS: BCM47XX: Fix LED inversion for WRT54GSv1
MIPS: Fix an n32 core file generation regset support regression
dm: fix race between dm_get_from_kobject() and __dm_destroy()
dm bufio: fix integer overflow when limiting maximum cache size
ALSA: hda: Add Raven PCI ID
MIPS: ralink: Fix typo in mt7628 pinmux function
MIPS: ralink: Fix MT7628 pinmux
ARM: 8721/1: mm: dump: check hardware RO bit for LPAE
ARM: 8722/1: mm: make STRICT_KERNEL_RWX effective for LPAE
x86/decoder: Add new TEST instruction pattern
lib/mpi: call cond_resched() from mpi_powm() loop
sched: Make resched_cpu() unconditional
vsock: use new wait API for vsock_stream_sendmsg()
AF_VSOCK: Shrink the area influenced by prepare_to_wait
ipv6: only call ip6_route_dev_notify() once for NETDEV_UNREGISTER
s390/disassembler: increase show_code buffer size
s390/disassembler: add missing end marker for e7 table
s390/runtime instrumention: fix possible memory corruption
s390: fix transactional execution control register handling
BACKPORT: time: Clean up CLOCK_MONOTONIC_RAW time handling
BACKPORT: time: Fix CLOCK_MONOTONIC_RAW sub-nanosecond accounting
UPSTREAM: arm64: vdso: fix clock_getres for 4GiB-aligned res
f2fs: updates on 4.15-rc1
UPSTREAM: android: binder: fix type mismatch warning
Linux 4.4.102
mm, hwpoison: fixup "mm: check the return value of lookup_page_ext for all call sites"
Conflicts:
fs/ext4/crypto_key.c
mm/debug-pagealloc.c
Change-Id: Ibe35d78bd0397f3ff2049e0a1dda20fcb06f2f75
Signed-off-by: Srinivasarao P <spathi@codeaurora.org>
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Changes in 4.4.103
s390: fix transactional execution control register handling
s390/runtime instrumention: fix possible memory corruption
s390/disassembler: add missing end marker for e7 table
s390/disassembler: increase show_code buffer size
ipv6: only call ip6_route_dev_notify() once for NETDEV_UNREGISTER
AF_VSOCK: Shrink the area influenced by prepare_to_wait
vsock: use new wait API for vsock_stream_sendmsg()
sched: Make resched_cpu() unconditional
lib/mpi: call cond_resched() from mpi_powm() loop
x86/decoder: Add new TEST instruction pattern
ARM: 8722/1: mm: make STRICT_KERNEL_RWX effective for LPAE
ARM: 8721/1: mm: dump: check hardware RO bit for LPAE
MIPS: ralink: Fix MT7628 pinmux
MIPS: ralink: Fix typo in mt7628 pinmux function
ALSA: hda: Add Raven PCI ID
dm bufio: fix integer overflow when limiting maximum cache size
dm: fix race between dm_get_from_kobject() and __dm_destroy()
MIPS: Fix an n32 core file generation regset support regression
MIPS: BCM47XX: Fix LED inversion for WRT54GSv1
autofs: don't fail mount for transient error
nilfs2: fix race condition that causes file system corruption
eCryptfs: use after free in ecryptfs_release_messaging()
bcache: check ca->alloc_thread initialized before wake up it
isofs: fix timestamps beyond 2027
NFS: Fix typo in nomigration mount option
nfs: Fix ugly referral attributes
nfsd: deal with revoked delegations appropriately
rtlwifi: rtl8192ee: Fix memory leak when loading firmware
rtlwifi: fix uninitialized rtlhal->last_suspend_sec time
ata: fixes kernel crash while tracing ata_eh_link_autopsy event
ext4: fix interaction between i_size, fallocate, and delalloc after a crash
ALSA: pcm: update tstamp only if audio_tstamp changed
ALSA: usb-audio: Add sanity checks to FE parser
ALSA: usb-audio: Fix potential out-of-bound access at parsing SU
ALSA: usb-audio: Add sanity checks in v2 clock parsers
ALSA: timer: Remove kernel warning at compat ioctl error paths
ALSA: hda/realtek - Fix ALC700 family no sound issue
fix a page leak in vhost_scsi_iov_to_sgl() error recovery
fs/9p: Compare qid.path in v9fs_test_inode
iscsi-target: Fix non-immediate TMR reference leak
target: Fix QUEUE_FULL + SCSI task attribute handling
KVM: nVMX: set IDTR and GDTR limits when loading L1 host state
KVM: SVM: obey guest PAT
SUNRPC: Fix tracepoint storage issues with svc_recv and svc_rqst_status
clk: ti: dra7-atl-clock: Fix of_node reference counting
clk: ti: dra7-atl-clock: fix child-node lookups
libnvdimm, namespace: fix label initialization to use valid seq numbers
libnvdimm, namespace: make 'resource' attribute only readable by root
IB/srpt: Do not accept invalid initiator port names
IB/srp: Avoid that a cable pull can trigger a kernel crash
NFC: fix device-allocation error return
i40e: Use smp_rmb rather than read_barrier_depends
igb: Use smp_rmb rather than read_barrier_depends
igbvf: Use smp_rmb rather than read_barrier_depends
ixgbevf: Use smp_rmb rather than read_barrier_depends
i40evf: Use smp_rmb rather than read_barrier_depends
fm10k: Use smp_rmb rather than read_barrier_depends
ixgbe: Fix skb list corruption on Power systems
parisc: Fix validity check of pointer size argument in new CAS implementation
powerpc/signal: Properly handle return value from uprobe_deny_signal()
media: Don't do DMA on stack for firmware upload in the AS102 driver
media: rc: check for integer overflow
cx231xx-cards: fix NULL-deref on missing association descriptor
media: v4l2-ctrl: Fix flags field on Control events
sched/rt: Simplify the IPI based RT balancing logic
fscrypt: lock mutex before checking for bounce page pool
net/9p: Switch to wait_event_killable()
PM / OPP: Add missing of_node_put(np)
e1000e: Fix error path in link detection
e1000e: Fix return value test
e1000e: Separate signaling for link check/link up
RDS: RDMA: return appropriate error on rdma map failures
PCI: Apply _HPX settings only to relevant devices
dmaengine: zx: set DMA_CYCLIC cap_mask bit
net: Allow IP_MULTICAST_IF to set index to L3 slave
net: 3com: typhoon: typhoon_init_one: make return values more specific
net: 3com: typhoon: typhoon_init_one: fix incorrect return values
drm/armada: Fix compile fail
ath10k: fix incorrect txpower set by P2P_DEVICE interface
ath10k: ignore configuring the incorrect board_id
ath10k: fix potential memory leak in ath10k_wmi_tlv_op_pull_fw_stats()
ath10k: set CTS protection VDEV param only if VDEV is up
ALSA: hda - Apply ALC269_FIXUP_NO_SHUTUP on HDA_FIXUP_ACT_PROBE
drm: Apply range restriction after color adjustment when allocation
mac80211: Remove invalid flag operations in mesh TSF synchronization
mac80211: Suppress NEW_PEER_CANDIDATE event if no room
iio: light: fix improper return value
staging: iio: cdc: fix improper return value
spi: SPI_FSL_DSPI should depend on HAS_DMA
netfilter: nft_queue: use raw_smp_processor_id()
netfilter: nf_tables: fix oob access
ASoC: rsnd: don't double free kctrl
btrfs: return the actual error value from from btrfs_uuid_tree_iterate
ASoC: wm_adsp: Don't overrun firmware file buffer when reading region data
s390/kbuild: enable modversions for symbols exported from asm
xen: xenbus driver must not accept invalid transaction ids
Revert "sctp: do not peel off an assoc from one netns to another one"
Linux 4.4.103
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
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commit 4bdced5c9a2922521e325896a7bbbf0132c94e56 upstream.
When a CPU lowers its priority (schedules out a high priority task for a
lower priority one), a check is made to see if any other CPU has overloaded
RT tasks (more than one). It checks the rto_mask to determine this and if so
it will request to pull one of those tasks to itself if the non running RT
task is of higher priority than the new priority of the next task to run on
the current CPU.
When we deal with large number of CPUs, the original pull logic suffered
from large lock contention on a single CPU run queue, which caused a huge
latency across all CPUs. This was caused by only having one CPU having
overloaded RT tasks and a bunch of other CPUs lowering their priority. To
solve this issue, commit:
b6366f048e0c ("sched/rt: Use IPI to trigger RT task push migration instead of pulling")
changed the way to request a pull. Instead of grabbing the lock of the
overloaded CPU's runqueue, it simply sent an IPI to that CPU to do the work.
Although the IPI logic worked very well in removing the large latency build
up, it still could suffer from a large number of IPIs being sent to a single
CPU. On a 80 CPU box, I measured over 200us of processing IPIs. Worse yet,
when I tested this on a 120 CPU box, with a stress test that had lots of
RT tasks scheduling on all CPUs, it actually triggered the hard lockup
detector! One CPU had so many IPIs sent to it, and due to the restart
mechanism that is triggered when the source run queue has a priority status
change, the CPU spent minutes! processing the IPIs.
Thinking about this further, I realized there's no reason for each run queue
to send its own IPI. As all CPUs with overloaded tasks must be scanned
regardless if there's one or many CPUs lowering their priority, because
there's no current way to find the CPU with the highest priority task that
can schedule to one of these CPUs, there really only needs to be one IPI
being sent around at a time.
This greatly simplifies the code!
The new approach is to have each root domain have its own irq work, as the
rto_mask is per root domain. The root domain has the following fields
attached to it:
rto_push_work - the irq work to process each CPU set in rto_mask
rto_lock - the lock to protect some of the other rto fields
rto_loop_start - an atomic that keeps contention down on rto_lock
the first CPU scheduling in a lower priority task
is the one to kick off the process.
rto_loop_next - an atomic that gets incremented for each CPU that
schedules in a lower priority task.
rto_loop - a variable protected by rto_lock that is used to
compare against rto_loop_next
rto_cpu - The cpu to send the next IPI to, also protected by
the rto_lock.
When a CPU schedules in a lower priority task and wants to make sure
overloaded CPUs know about it. It increments the rto_loop_next. Then it
atomically sets rto_loop_start with a cmpxchg. If the old value is not "0",
then it is done, as another CPU is kicking off the IPI loop. If the old
value is "0", then it will take the rto_lock to synchronize with a possible
IPI being sent around to the overloaded CPUs.
If rto_cpu is greater than or equal to nr_cpu_ids, then there's either no
IPI being sent around, or one is about to finish. Then rto_cpu is set to the
first CPU in rto_mask and an IPI is sent to that CPU. If there's no CPUs set
in rto_mask, then there's nothing to be done.
When the CPU receives the IPI, it will first try to push any RT tasks that is
queued on the CPU but can't run because a higher priority RT task is
currently running on that CPU.
Then it takes the rto_lock and looks for the next CPU in the rto_mask. If it
finds one, it simply sends an IPI to that CPU and the process continues.
If there's no more CPUs in the rto_mask, then rto_loop is compared with
rto_loop_next. If they match, everything is done and the process is over. If
they do not match, then a CPU scheduled in a lower priority task as the IPI
was being passed around, and the process needs to start again. The first CPU
in rto_mask is sent the IPI.
This change removes this duplication of work in the IPI logic, and greatly
lowers the latency caused by the IPIs. This removed the lockup happening on
the 120 CPU machine. It also simplifies the code tremendously. What else
could anyone ask for?
Thanks to Peter Zijlstra for simplifying the rto_loop_start atomic logic and
supplying me with the rto_start_trylock() and rto_start_unlock() helper
functions.
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Clark Williams <williams@redhat.com>
Cc: Daniel Bristot de Oliveira <bristot@redhat.com>
Cc: John Kacur <jkacur@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Scott Wood <swood@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20170424114732.1aac6dc4@gandalf.local.home
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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commit 7c2102e56a3f7d85b5d8f33efbd7aecc1f36fdd8 upstream.
The current implementation of synchronize_sched_expedited() incorrectly
assumes that resched_cpu() is unconditional, which it is not. This means
that synchronize_sched_expedited() can hang when resched_cpu()'s trylock
fails as follows (analysis by Neeraj Upadhyay):
o CPU1 is waiting for expedited wait to complete:
sync_rcu_exp_select_cpus
rdp->exp_dynticks_snap & 0x1 // returns 1 for CPU5
IPI sent to CPU5
synchronize_sched_expedited_wait
ret = swait_event_timeout(rsp->expedited_wq,
sync_rcu_preempt_exp_done(rnp_root),
jiffies_stall);
expmask = 0x20, CPU 5 in idle path (in cpuidle_enter())
o CPU5 handles IPI and fails to acquire rq lock.
Handles IPI
sync_sched_exp_handler
resched_cpu
returns while failing to try lock acquire rq->lock
need_resched is not set
o CPU5 calls rcu_idle_enter() and as need_resched is not set, goes to
idle (schedule() is not called).
o CPU 1 reports RCU stall.
Given that resched_cpu() is now used only by RCU, this commit fixes the
assumption by making resched_cpu() unconditional.
Reported-by: Neeraj Upadhyay <neeraju@codeaurora.org>
Suggested-by: Neeraj Upadhyay <neeraju@codeaurora.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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commit 3bda2b55b41d ("Merge android-4.4.96 (aed4c54) into msm-4.4")
replaced HMP scheduler check_for_migration() implementation with
EAS scheduler implementation. This breaks HMP scheduler upmgiration
functionality. Fix this by restoring the previous implementation.
Change-Id: I3221f3efe42e1e43f8009cfa52c11afbb9d9c5b3
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
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User space tasks will have the same semantics for hotplug and isolation.
Currently the sched_getaffinity() include isolated CPU on which user
space tasks are forbidden to run. So fix this by excluding isolated cpus
while returning cpu mask for user space tasks in sched_getaffinity().
Change-Id: Ib6a8ca864754f73bbaf809c3ceaef5f91d567ca9
Signed-off-by: Lingutla Chandrasekhar <clingutla@codeaurora.org>
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Update sched_get_task_cpu_cycles trace to include pid and name of the
task to help with debug better.
Change-Id: Ic307ebcf0a44c94bf0a2aa1a02b8aeff39010b29
Signed-off-by: Puja Gupta <pujag@codeaurora.org>
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
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Truncating period to u32 could lead to incorrect results. Make it u64
instead.
Change-Id: I5224a943e64bc6d64b6c8e614a01f798a6cdc796
Signed-off-by: Puja Gupta <pujag@codeaurora.org>
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
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The exiting task's prev_window and curr_window arrays are freed
with rq->lock acquired. The kfree() may wakeup kswapd and if
kswapd wakeup needs the same rq->lock, we hit a deadlock. Fix
this issue by freeing these arrays after releasing the lock.
Since the task is already marked as exiting under lock, delaying
the freeing of the current and window arrays will not have
any side effect.
Change-Id: I3282d91ba715765e38177b9d66be32aaed989303
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
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* refs/heads/tmp-46d256d
Linux 4.4.97
staging: r8712u: Fix Sparse warning in rtl871x_xmit.c
xen: don't print error message in case of missing Xenstore entry
bt8xx: fix memory leak
s390/dasd: check for device error pointer within state change interrupts
mei: return error on notification request to a disconnected client
exynos4-is: fimc-is: Unmap region obtained by of_iomap()
staging: lustre: ptlrpc: skip lock if export failed
staging: lustre: hsm: stack overrun in hai_dump_data_field
staging: lustre: llite: don't invoke direct_IO for the EOF case
platform/x86: intel_mid_thermal: Fix module autoload
scsi: aacraid: Process Error for response I/O
xen/manage: correct return value check on xenbus_scanf()
cx231xx: Fix I2C on Internal Master 3 Bus
perf tools: Only increase index if perf_evsel__new_idx() succeeds
drm/amdgpu: when dpm disabled, also need to stop/start vce.
i2c: riic: correctly finish transfers
ext4: do not use stripe_width if it is not set
ext4: fix stripe-unaligned allocations
staging: rtl8712u: Fix endian settings for structs describing network packets
mfd: axp20x: Fix axp288 PEK_DBR and PEK_DBF irqs being swapped
mfd: ab8500-sysctrl: Handle probe deferral
ARM: pxa: Don't rely on public mmc header to include leds.h
mmc: s3cmci: include linux/interrupt.h for tasklet_struct
PM / wakeirq: report a wakeup_event on dedicated wekup irq
Fix tracing sample code warning.
tracing/samples: Fix creation and deletion of simple_thread_fn creation
drm/msm: fix an integer overflow test
drm/msm: Fix potential buffer overflow issue
perf tools: Fix build failure on perl script context
ocfs2: fstrim: Fix start offset of first cluster group during fstrim
ARM: 8715/1: add a private asm/unaligned.h
ARM: dts: mvebu: pl310-cache disable double-linefill
arm64: ensure __dump_instr() checks addr_limit
ASoC: adau17x1: Workaround for noise bug in ADC
KEYS: fix out-of-bounds read during ASN.1 parsing
KEYS: return full count in keyring_read() if buffer is too small
cifs: check MaxPathNameComponentLength != 0 before using it
ALSA: seq: Fix nested rwsem annotation for lockdep splat
ALSA: timer: Add missing mutex lock for compat ioctls
BACKPORT: xfrm: Clear sk_dst_cache when applying per-socket policy.
Revert "ANDROID: sched/rt: schedtune: Add boost retention to RT"
cpufreq: Drop schedfreq governor
ANDROID: sched/rt: schedtune: Add boost retention to RT
ANDROID: sched/rt: add schedtune accounting
ANDROID: Revert "arm64: move ELF_ET_DYN_BASE to 4GB / 4MB"
ANDROID: Revert "arm: move ELF_ET_DYN_BASE to 4MB"
sched: EAS: Fix the calculation of group util in group_idle_state()
sched: EAS: update trg_cpu to backup_cpu if no energy saving for target_cpu
sched: EAS: Fix the condition to distinguish energy before/after
Conflicts:
drivers/cpufreq/Kconfig
drivers/gpu/drm/msm/msm_gem_submit.c
kernel/sched/core.c
kernel/sched/fair.c
kernel/sched/rt.c
kernel/sched/sched.h
Change-Id: I0d8c5287cb67fd47c8944a002c0ca71adcdef537
Signed-off-by: Srinivasarao P <spathi@codeaurora.org>
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This reverts commit d194ba5d712f051ff6c025f3484bb72f219764e3.
Reason for revert: Broke some builds. Will fix and resubmit.
Change-Id: I4e6fa1562346eda1bbf058f1d5ace5ba6256ce07
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We all should be using (and improving) the schedutil governor now. Get
rid of the non-upstream governor.
Tested on Hikey.
Change-Id: Ic660756536e5da51952738c3c18b94e31f58cd57
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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Boosted RT tasks can be deboosted quickly, this makes boost usless
for RT tasks and causes lots of glitching. Use timers to prevent
de-boost too soon and wait for long enough such that next enqueue
happens after a threshold.
While this can be solved in the governor, there are following
advantages:
- The approach used is governor-independent
- Reduces boost group lock contention for frequently sleepers/wakers
- Works with schedfreq without any other schedfreq hacks.
Bug: 30210506
Change-Id: I41788b235586988be446505deb7c0529758a9898
Signed-off-by: Joel Fernandes <joelaf@google.com>
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This patch adds schedtune enqueue/dequeue to RT scheduling class.
Change-Id: If416e64319d62191f3aedd675d3e9a21fe2102fb
Signed-off-by: Joel Fernandes <joelaf@google.com>
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util_delta becomes not zero in eenv_before, which will affect the
calculation of grp_util in group_idle_state(). Fix it under the
new condition.
Change-Id: Ic3853bb45876a8e388afcbe4e72d25fc42b1d7b0
Signed-off-by: Ke Wang <ke.wang@spreadtrum.com>
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If no energy saving for target_cpu in the calculation of energy_diff(),
backup_cpu will be set as the new dst_cpu for the next calculation. At this
point, we also need update the new trg_cpu as backup_cpu to make sure the
subsequent calculation of energy_diff() is correct.
Signed-off-by: Ke Wang <ke.wang@spreadtrum.com>
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Before commit 5f8b3a757d65 ("sched/fair: consider task utilization in
group_norm_util()"), eenv->util_delta is used to distinguish energy
before and energy after in sched_group_energy(). After that commit,
eenv->util_delta can not do that any more.
In this commit, use trg_cpu to distinguish energy before/after in
sched_group_energy().
Before apply this commit, cap_before/cap_delta is not correct:
<idle>-0 [001] 147504.608920: sched_energy_diff: pid=7 comm=rcu_preempt
src_cpu=1 dst_cpu=3 usage_delta=7 nrg_before=250 nrg_after=250 nrg_diff=0
cap_before=0 cap_after=528 cap_delta=1056 nrg_delta=0 nrg_payoff=0
After apply this commit, cap_before/cap_delta retrun to normal:
<idle>-0 [001] 220.494011: sched_energy_diff: pid=7 comm=rcu_preempt
src_cpu=1 dst_cpu=2 usage_delta=3 nrg_before=248 nrg_after=248 nrg_diff=0
cap_before=528 cap_after=528 cap_delta=0 nrg_delta=0 nrg_payoff=0
Signed-off-by: Ke Wang <ke.wang@spreadtrum.com>
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* refs/heads/tmp-aed4c54
Linux 4.4.96
Revert "drm: bridge: add DT bindings for TI ths8135"
ecryptfs: fix dereference of NULL user_key_payload
x86/microcode/intel: Disable late loading on model 79
regulator: fan53555: fix I2C device ids
can: kvaser_usb: Ignore CMD_FLUSH_QUEUE_REPLY messages
can: kvaser_usb: Correct return value in printout
can: sun4i: fix loopback mode
scsi: sg: Re-fix off by one in sg_fill_request_table()
scsi: zfcp: fix erp_action use-before-initialize in REC action trace
assoc_array: Fix a buggy node-splitting case
Input: gtco - fix potential out-of-bound access
Input: elan_i2c - add ELAN0611 to the ACPI table
xen/gntdev: avoid out of bounds access in case of partial gntdev_mmap()
fuse: fix READDIRPLUS skipping an entry
spi: uapi: spidev: add missing ioctl header
usb: xhci: Handle error condition in xhci_stop_device()
ceph: unlock dangling spinlock in try_flush_caps()
ALSA: hda - fix headset mic problem for Dell machines with alc236
ALSA: hda/realtek - Add support for ALC236/ALC3204
workqueue: replace pool->manager_arb mutex with a flag
sched: EAS: upmigrate misfit current task
sched: avoid pushing tasks to an offline CPU
sched: Extend active balance to accept 'push_task' argument
Revert "sched/core: Warn if ENERGY_AWARE is enabled but data is missing"
Revert "sched/core: fix have_sched_energy_data build warning"
FROMLIST: kbuild: clang: fix build failures with sparse check
Revert "Revert "UPSTREAM: efi/libstub/arm64: Set -fpie when building the EFI stub""
BACKPORT: efi/libstub: Unify command line param parsing
Conflicts:
drivers/usb/host/xhci-hub.c
kernel/sched/core.c
kernel/sched/fair.c
Change-Id: Ie36ce5de516f02b2d553043009d9afee64e7ff24
Signed-off-by: Blagovest Kolenichev <bkolenichev@codeaurora.org>
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Upmigrate misfit current task upon scheduler tick with stopper.
We can kick an random (not necessarily big CPU) NOHZ idle CPU when a
CPU bound task is in need of upmigration. But it's not efficient as that
way needs following unnecessary wakeups:
1. Busy little CPU A to kick idle B
2. B runs idle balancer and enqueue migration/A
3. B goes idle
4. A runs migration/A, enqueues busy task on B.
5. B wakes up again.
This change makes active upmigration more efficiently by doing:
1. Busy little CPU A find target CPU B upon tick.
2. CPU A enqueues migration/A.
Change-Id: Ie865738054ea3296f28e6ba01710635efa7193c0
[joonwoop: The original version had logic to reserve CPU. The logic is
omitted in this version.]
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>
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Currently active_load_balance_cpu_stop is run by cpu stopper and it
pushes running tasks off the busiest CPU onto idle target CPU. But
there is no check to see whether target cpu is offline or not before
pushing the tasks. With the introduction of active migration in the
scheduler tick path (see check_for_migration()) there have been
instances of attempts to migrate tasks to offline CPUs.
Add a check as to whether the target cpu is online or not to prevent
scheduling on offline CPUs.
Change-Id: Ib8ac7f8aeabd3ca7365f3eae977075952dab4f21
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>
[rameezmustafa@codeaurora.org]: Port to msm-3.18]
Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>
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Active balance currently picks one task to migrate from busy cpu to
a chosen cpu (push_cpu). This patch extends active load balance to
recognize a particular task ('push_task') that needs to be migrated to
'push_cpu'. This capability will be leveraged by HMP-aware task
placement in a subsequent patch.
Change-Id: If31320111e6cc7044e617b5c3fd6d8e0c0e16952
Signed-off-by: Srivatsa Vaddagiri <vatsa@codeaurora.org>
[rameezmustafa@codeaurora.org]: Port to msm-3.18]
Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org>
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This reverts commit a21299785a502ca4b3592a0f977aa1202b105260.
Change-Id: Idb707c80788d8b6d26d400a59d9b14f854cce89f
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This reverts commit a899b9085c8d5d581b214c24dc707466e8cb479f.
Reverting for now due to suspend warning issues.
Change-Id: I9387297b52552a73d5a253b9e8e4467b366479a5
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* refs/heads/tmp-ceee5bd
BACKPORT: arm64: relocatable: suppress R_AARCH64_ABS64 relocations in vmlinux
sched/core: fix have_sched_energy_data build warning
sched/core: Warn if ENERGY_AWARE is enabled but data is missing
sched: walt: Correct WALT window size initialization
FROMLIST: sched/fair: Use wake_q length as a hint for wake_wide
sched: WALT: account cumulative window demand
sched/fair: remove useless variable in find_best_target
sched/tune: access schedtune_initialized under CGROUP_SCHEDTUNE
sched/fair: consider task utilization in group_max_util()
sched/fair: consider task utilization in group_norm_util()
sched/fair: enforce EAS mode
sched/fair: ignore backup CPU when not valid
sched/fair: trace energy_diff for non boosted tasks
UPSTREAM: sched/fair: Sync task util before slow-path wakeup
UPSTREAM: sched/fair: Fix usage of find_idlest_group() when the local group is idlest
UPSTREAM: sched/fair: Fix usage of find_idlest_group() when no groups are allowed
BACKPORT: sched/fair: Fix find_idlest_group when local group is not allowed
UPSTREAM: sched/fair: Remove unnecessary comparison with -1
BACKPORT: sched/fair: Move select_task_rq_fair slow-path into its own function
UPSTREAM: sched/fair: Force balancing on nohz balance if local group has capacity
UPSTREAM: sched/core: Add missing update_rq_clock() call in set_user_nice()
UPSTREAM: sched/core: Add missing update_rq_clock() call for task_hot()
UPSTREAM: sched/core: Add missing update_rq_clock() in detach_task_cfs_rq()
UPSTREAM: sched/core: Add missing update_rq_clock() in post_init_entity_util_avg()
UPSTREAM: sched/core: Fix find_idlest_group() for fork
BACKPORT: sched/fair: Fix PELT integrity for new tasks
BACKPORT: sched/cgroup: Fix cpu_cgroup_fork() handling
UPSTREAM: sched/fair: Fix and optimize the fork() path
BACKPORT: sched/fair: Make it possible to account fair load avg consistently
cpufreq/sched: Consider max cpu capacity when choosing frequencies
Linux 4.4.95
FS-Cache: fix dereference of NULL user_key_payload
fscrypto: require write access to mount to set encryption policy
KEYS: Fix race between updating and finding a negative key
fscrypt: fix dereference of NULL user_key_payload
f2fs crypto: add missing locking for keyring_key access
f2fs crypto: replace some BUG_ON()'s with error checks
sched/autogroup: Fix autogroup_move_group() to never skip sched_move_task()
parisc: Fix double-word compare and exchange in LWS code on 32-bit kernels
parisc: Avoid trashing sr2 and sr3 in LWS code
pkcs7: Prevent NULL pointer dereference, since sinfo is not always set.
KEYS: don't let add_key() update an uninstantiated key
lib/digsig: fix dereference of NULL user_key_payload
KEYS: encrypted: fix dereference of NULL user_key_payload
rtlwifi: rtl8821ae: Fix connection lost problem
clockevents/drivers/cs5535: Improve resilience to spurious interrupts
bus: mbus: fix window size calculation for 4GB windows
brcmsmac: make some local variables 'static const' to reduce stack size
i2c: ismt: Separate I2C block read from SMBus block read
ALSA: hda: Remove superfluous '-' added by printk conversion
ALSA: seq: Enable 'use' locking in all configurations
drm/nouveau/mmu: flush tlbs before deleting page tables
drm/nouveau/bsp/g92: disable by default
can: esd_usb2: Fix can_dlc value for received RTR, frames
usb: musb: Check for host-mode using is_host_active() on reset interrupt
usb: musb: sunxi: Explicitly release USB PHY on exit
can: gs_usb: fix busy loop if no more TX context is available
ALSA: usb-audio: Add native DSD support for Pro-Ject Pre Box S2 Digital
usb: hub: Allow reset retry for USB2 devices on connect bounce
usb: quirks: add quirk for WORLDE MINI MIDI keyboard
usb: cdc_acm: Add quirk for Elatec TWN3
USB: serial: metro-usb: add MS7820 device id
USB: core: fix out-of-bounds access bug in usb_get_bos_descriptor()
USB: devio: Revert "USB: devio: Don't corrupt user memory"
ANDROID: binder: show high watermark of alloc->pages.
ANDROID: binder: Add thread->process_todo flag.
UPSTREAM: arm64: compat: Remove leftover variable declaration
ANDROID: sched/fair: Select correct capacity state for energy_diff
Revert "UPSTREAM: efi/libstub/arm64: Set -fpie when building the EFI stub"
cpufreq: schedutil: clamp util to CPU maximum capacity
FROMLIST: android: binder: Fix null ptr dereference in debug msg
FROMLIST: android: binder: Change binder_shrinker to static
cpufreq/sched: Use cpu max freq rather than policy max
Conflicts:
include/linux/sched.h
kernel/sched/core.c
kernel/sched/fair.c
Change-Id: I2751f851df741f00e797deaf2119872b3dced655
Signed-off-by: Blagovest Kolenichev <bkolenichev@codeaurora.org>
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Changes in 4.4.95
USB: devio: Revert "USB: devio: Don't corrupt user memory"
USB: core: fix out-of-bounds access bug in usb_get_bos_descriptor()
USB: serial: metro-usb: add MS7820 device id
usb: cdc_acm: Add quirk for Elatec TWN3
usb: quirks: add quirk for WORLDE MINI MIDI keyboard
usb: hub: Allow reset retry for USB2 devices on connect bounce
ALSA: usb-audio: Add native DSD support for Pro-Ject Pre Box S2 Digital
can: gs_usb: fix busy loop if no more TX context is available
usb: musb: sunxi: Explicitly release USB PHY on exit
usb: musb: Check for host-mode using is_host_active() on reset interrupt
can: esd_usb2: Fix can_dlc value for received RTR, frames
drm/nouveau/bsp/g92: disable by default
drm/nouveau/mmu: flush tlbs before deleting page tables
ALSA: seq: Enable 'use' locking in all configurations
ALSA: hda: Remove superfluous '-' added by printk conversion
i2c: ismt: Separate I2C block read from SMBus block read
brcmsmac: make some local variables 'static const' to reduce stack size
bus: mbus: fix window size calculation for 4GB windows
clockevents/drivers/cs5535: Improve resilience to spurious interrupts
rtlwifi: rtl8821ae: Fix connection lost problem
KEYS: encrypted: fix dereference of NULL user_key_payload
lib/digsig: fix dereference of NULL user_key_payload
KEYS: don't let add_key() update an uninstantiated key
pkcs7: Prevent NULL pointer dereference, since sinfo is not always set.
parisc: Avoid trashing sr2 and sr3 in LWS code
parisc: Fix double-word compare and exchange in LWS code on 32-bit kernels
sched/autogroup: Fix autogroup_move_group() to never skip sched_move_task()
f2fs crypto: replace some BUG_ON()'s with error checks
f2fs crypto: add missing locking for keyring_key access
fscrypt: fix dereference of NULL user_key_payload
KEYS: Fix race between updating and finding a negative key
fscrypto: require write access to mount to set encryption policy
FS-Cache: fix dereference of NULL user_key_payload
Linux 4.4.95
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
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commit 18f649ef344127ef6de23a5a4272dbe2fdb73dde upstream.
The PF_EXITING check in task_wants_autogroup() is no longer needed. Remove
it, but see the next patch.
However the comment is correct in that autogroup_move_group() must always
change task_group() for every thread so the sysctl_ check is very wrong;
we can race with cgroups and even sys_setsid() is not safe because a task
running with task_group() == ag->tg must participate in refcounting:
int main(void)
{
int sctl = open("/proc/sys/kernel/sched_autogroup_enabled", O_WRONLY);
assert(sctl > 0);
if (fork()) {
wait(NULL); // destroy the child's ag/tg
pause();
}
assert(pwrite(sctl, "1\n", 2, 0) == 2);
assert(setsid() > 0);
if (fork())
pause();
kill(getppid(), SIGKILL);
sleep(1);
// The child has gone, the grandchild runs with kref == 1
assert(pwrite(sctl, "0\n", 2, 0) == 2);
assert(setsid() > 0);
// runs with the freed ag/tg
for (;;)
sleep(1);
return 0;
}
crashes the kernel. It doesn't really need sleep(1), it doesn't matter if
autogroup_move_group() actually frees the task_group or this happens later.
Reported-by: Vern Lovejoy <vlovejoy@redhat.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: hartsjc@redhat.com
Cc: vbendel@redhat.com
Link: http://lkml.kernel.org/r/20161114184609.GA15965@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
[sumits: submit to 4.4 LTS, post testing on Hikey]
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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have_sched_energy_data is defined only for CONFIG_SMP, so declare it
only with CONFIG_SMP.
Fixes warning from intel bot:
tree: https://android.googlesource.com/kernel/msm android-4.4
head: a21299785a502ca4b3592a0f977aa1202b105260
commit: a21299785a502ca4b3592a0f977aa1202b105260 [5/5] sched/core: Warn
if ENERGY_AWARE is enabled but data is missing
config: i386-randconfig-x002-201743 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
git checkout a21299785a502ca4b3592a0f977aa1202b105260
# save the attached .config to linux build tree
make ARCH=i386
All warnings (new ones prefixed by >>):
>> kernel//sched/core.c:94:13: warning: 'have_sched_energy_data' used
but never defined
static bool have_sched_energy_data(void);
^~~~~~~~~~~~~~~~~~~~~~
vim +/have_sched_energy_data +94 kernel//sched/core.c
93
> 94 static bool have_sched_energy_data(void);
95
Change-Id: I266b63ece6fb31d2b5b11821a8244e147ba6d3a4
Signed-off-by: Joel Fernandes <joelaf@google.com>
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If the EAS energy model is missing or incomplete, i.e. sd_scs is NULL, then
sched_group_energy will return -EINVAL on the assumption that it raced with a
CPU hotplug event. In that case, energy_diff will return 0 and the energy-aware
wake path will silently fail to trigger any migrations.
This case can be triggered by disabling CONFIG_SCHED_MC on existing platforms,
so that there are no sched_groups with the SD_SHARE_CAP_STATES flag, so that
sd_scs is NULL.
Add checks so that a warning is printed if EAS is ever enabled while the
necessary data is not present.
Change-Id: Id233a510b5ad8b7fcecac0b1d789e730bbfc7c4a
Signed-off-by: Brendan Jackman <brendan.jackman@arm.com>
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It is preferable that WALT window rollover occurs just
before a tick, since the tick is an opportune moment
to record a complete window's statistics, as well as report
those stats to the cpu frequency governor. When CONFIG_HZ
results in a TICK_NSEC that isn't a integral number, this
requirement may be violated. Account for this by reducing
the WALT window size to the nearest multiple of TICK_NSEC.
Commit d368c6faa19b ("sched: walt: fix window misalignment
when HZ=300") attempted to do this but WALT isn't using
MIN_SCHED_RAVG_WINDOW as the window size and the patch was
doing nothing.
Also, change the type of 'walt_disabled' to bool and warn
if an invalid window size causes WALT to be disabled.
Change-Id: Ie3dcfc21a3df4408254ca1165a355bbe391ed5c7
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>
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(from https://patchwork.kernel.org/patch/9895261/)
This patch adds a parameter to select_task_rq, sibling_count_hint
allowing the caller, where it has this information, to inform the
sched_class the number of tasks that are being woken up as part of
the same event.
The wake_q mechanism is one case where this information is available.
select_task_rq_fair can then use the information to detect that it
needs to widen the search space for task placement in order to avoid
overloading the last-level cache domain's CPUs.
* * *
The reason I am investigating this change is the following use case
on ARM big.LITTLE (asymmetrical CPU capacity): 1 task per CPU, which
all repeatedly do X amount of work then
pthread_barrier_wait (i.e. sleep until the last task finishes its X
and hits the barrier). On big.LITTLE, the tasks which get a "big" CPU
finish faster, and then those CPUs pull over the tasks that are still
running:
v CPU v ->time->
-------------
0 (big) 11111 /333
-------------
1 (big) 22222 /444|
-------------
2 (LITTLE) 333333/
-------------
3 (LITTLE) 444444/
-------------
Now when task 4 hits the barrier (at |) and wakes the others up,
there are 4 tasks with prev_cpu=<big> and 0 tasks with
prev_cpu=<little>. want_affine therefore means that we'll only look
in CPUs 0 and 1 (sd_llc), so tasks will be unnecessarily coscheduled
on the bigs until the next load balance, something like this:
v CPU v ->time->
------------------------
0 (big) 11111 /333 31313\33333
------------------------
1 (big) 22222 /444|424\4444444
------------------------
2 (LITTLE) 333333/ \222222
------------------------
3 (LITTLE) 444444/ \1111
------------------------
^^^
underutilization
So, I'm trying to get want_affine = 0 for these tasks.
I don't _think_ any incarnation of the wakee_flips mechanism can help
us here because which task is waker and which tasks are wakees
generally changes with each iteration.
However pthread_barrier_wait (or more accurately FUTEX_WAKE) has the
nice property that we know exactly how many tasks are being woken, so
we can cheat.
It might be a disadvantage that we "widen" _every_ task that's woken in
an event, while select_idle_sibling would work fine for the first
sd_llc_size - 1 tasks.
IIUC, if wake_affine() behaves correctly this trick wouldn't be
necessary on SMP systems, so it might be best guarded by the presence
of SD_ASYM_CPUCAPACITY?
* * *
Final note..
In order to observe "perfect" behaviour for this use case, I also had
to disable the TTWU_QUEUE sched feature. Suppose during the wakeup
above we are working through the work queue and have placed tasks 3
and 2, and are about to place task 1:
v CPU v ->time->
--------------
0 (big) 11111 /333 3
--------------
1 (big) 22222 /444|4
--------------
2 (LITTLE) 333333/ 2
--------------
3 (LITTLE) 444444/ <- Task 1 should go here
--------------
If TTWU_QUEUE is enabled, we will not yet have enqueued task
2 (having instead sent a reschedule IPI) or attached its load to CPU
2. So we are likely to also place task 1 on cpu 2. Disabling
TTWU_QUEUE means that we enqueue task 2 before placing task 1,
solving this issue. TTWU_QUEUE is there to minimise rq lock
contention, and I guess that this contention is less of an issue on
big.LITTLE systems since they have relatively few CPUs, which
suggests the trade-off makes sense here.
Change-Id: I2080302839a263e0841a89efea8589ea53bbda9c
Signed-off-by: Brendan Jackman <brendan.jackman@arm.com>
Signed-off-by: Chris Redpath <chris.redpath@arm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Josef Bacik <josef@toxicpanda.com>
Cc: Joel Fernandes <joelaf@google.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
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Energy cost estimation has been a long lasting challenge for WALT
because WALT guides CPU frequency based on the CPU utilization of
previous window. Consequently it's not possible to know newly
waking-up task's energy cost until WALT's end of the current window.
The WALT already tracks 'Previous Runnable Sum' (prev_runnable_sum)
and 'Cumulative Runnable Average' (cr_avg). They are designed for
CPU frequency guidance and task placement but unfortunately both
are not suitable for the energy cost estimation.
It's because using prev_runnable_sum for energy cost calculation would
make us to account CPU and task's energy solely based on activity in the
previous window so for example, any task didn't have an activity in the
previous window will be accounted as a 'zero energy cost' task.
Energy estimation with cr_avg is what energy_diff() relies on at present.
However cr_avg can only represent instantaneous picture of energy cost
thus for example, if a CPU was fully occupied for an entire WALT window
and became idle just before window boundary, and if there is a wake-up,
energy_diff() accounts that CPU is a 'zero energy cost' CPU.
As a result, introduce a new accounting unit 'Cumulative Window Demand'.
The cumulative window demand tracks all the tasks' demands have seen in
current window which is neither instantaneous nor actual execution time.
Because task demand represents estimated scaled execution time when the
task runs a full window, accumulation of all the demands represents
predicted CPU load at the end of window.
Thus we can estimate CPU's frequency at the end of current WALT window
with the cumulative window demand.
The use of prev_runnable_sum for the CPU frequency guidance and cr_avg
for the task placement have not changed and these are going to be used
for both purpose while this patch aims to add an additional statistics.
Change-Id: I9908c77ead9973a26dea2b36c001c2baf944d4f5
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
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Patch 5680f23f20c7 ("sched/fair: streamline find_best_target
heuristics") has reworked function find_best_target, as result the
variable "target_util" is useless now. So remove it.
Change-Id: I5447062419e5828a49115119984fac6cd37db034
Signed-off-by: Leo Yan <leo.yan@linaro.org>
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