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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 EFI changes from Ingo Molnar:
"The main changes:
- Add debug code to the dump EFI pagetable - Borislav Petkov
- Make 1:1 runtime mapping robust when booting on machines with lots
of memory - Borislav Petkov
- Move the EFI facilities bits out of 'x86_efi_facility' and into
efi.flags which is the standard architecture independent place to
keep EFI state, by Matt Fleming.
- Add 'EFI mixed mode' support: this allows 64-bit kernels to be
booted from 32-bit firmware. This needs a bootloader that supports
the 'EFI handover protocol'. By Matt Fleming"
* 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (31 commits)
x86, efi: Abstract x86 efi_early calls
x86/efi: Restore 'attr' argument to query_variable_info()
x86/efi: Rip out phys_efi_get_time()
x86/efi: Preserve segment registers in mixed mode
x86/boot: Fix non-EFI build
x86, tools: Fix up compiler warnings
x86/efi: Re-disable interrupts after calling firmware services
x86/boot: Don't overwrite cr4 when enabling PAE
x86/efi: Wire up CONFIG_EFI_MIXED
x86/efi: Add mixed runtime services support
x86/efi: Firmware agnostic handover entry points
x86/efi: Split the boot stub into 32/64 code paths
x86/efi: Add early thunk code to go from 64-bit to 32-bit
x86/efi: Build our own EFI services pointer table
efi: Add separate 32-bit/64-bit definitions
x86/efi: Delete dead code when checking for non-native
x86/mm/pageattr: Always dump the right page table in an oops
x86, tools: Consolidate #ifdef code
x86/boot: Cleanup header.S by removing some #ifdefs
efi: Use NULL instead of 0 for pointer
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Conflicts:
arch/x86/kernel/setup.c
arch/x86/platform/efi/efi.c
arch/x86/platform/efi/efi_64.c
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The traditional approach of using machine-specific types such as
'unsigned long' does not allow the kernel to interact with firmware
running in a different CPU mode, e.g. 64-bit kernel with 32-bit EFI.
Add distinct EFI structure definitions for both 32-bit and 64-bit so
that we can use them in the 32-bit and 64-bit code paths.
Acked-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
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Conflicts:
arch/x86/include/asm/efi.h
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There's no good reason to keep efi_enabled() under CONFIG_X86 anymore,
since nothing about the implementation is specific to x86.
Set EFI feature flags in the ia64 boot path instead of claiming to
support all features. The old behaviour was actually buggy since
efi.memmap never points to a valid memory map, so we shouldn't be
claiming to support EFI_MEMMAP.
Fortunately, this bug was never triggered because EFI_MEMMAP isn't used
outside of arch/x86 currently, but that may not always be the case.
Reviewed-and-tested-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
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As we grow support for more EFI architectures they're going to want the
ability to query which EFI features are available on the running system.
Instead of storing this information in an architecture-specific place,
stick it in the global 'struct efi', which is already the central
location for EFI state.
While we're at it, let's change the return value of efi_enabled() to be
bool and replace all references to 'facility' with 'feature', which is
the usual word used to describe the attributes of the running system.
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 cpu handling changes from Ingo Molnar:
"Bigger changes:
- Intel CPU hardware-enablement: new vector instructions support
(AVX-512), by Fenghua Yu.
- Support the clflushopt instruction and use it in appropriate
places. clflushopt is similar to clflush but with more relaxed
ordering, by Ross Zwisler.
- MSR accessor cleanups, by Borislav Petkov.
- 'forcepae' boot flag for those who have way too much time to spend
on way too old Pentium-M systems and want to live way too
dangerously, by Chris Bainbridge"
* 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86, cpu: Add forcepae parameter for booting PAE kernels on PAE-disabled Pentium M
Rename TAINT_UNSAFE_SMP to TAINT_CPU_OUT_OF_SPEC
x86, intel: Make MSR_IA32_MISC_ENABLE bit constants systematic
x86, Intel: Convert to the new bit access MSR accessors
x86, AMD: Convert to the new bit access MSR accessors
x86: Add another set of MSR accessor functions
x86: Use clflushopt in drm_clflush_virt_range
x86: Use clflushopt in drm_clflush_page
x86: Use clflushopt in clflush_cache_range
x86: Add support for the clflushopt instruction
x86, AVX-512: Enable AVX-512 States Context Switch
x86, AVX-512: AVX-512 Feature Detection
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Rename TAINT_UNSAFE_SMP to TAINT_CPU_OUT_OF_SPEC, so we can repurpose
the flag to encompass a wider range of pushing the CPU beyond its
warrany.
Signed-off-by: Dave Jones <davej@fedoraproject.org>
Link: http://lkml.kernel.org/r/20140226154949.GA770@redhat.com
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull scheduler changes from Ingo Molnar:
"Bigger changes:
- sched/idle restructuring: they are WIP preparation for deeper
integration between the scheduler and idle state selection, by
Nicolas Pitre.
- add NUMA scheduling pseudo-interleaving, by Rik van Riel.
- optimize cgroup context switches, by Peter Zijlstra.
- RT scheduling enhancements, by Thomas Gleixner.
The rest is smaller changes, non-urgnt fixes and cleanups"
* 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (68 commits)
sched: Clean up the task_hot() function
sched: Remove double calculation in fix_small_imbalance()
sched: Fix broken setscheduler()
sparc64, sched: Remove unused sparc64_multi_core
sched: Remove unused mc_capable() and smt_capable()
sched/numa: Move task_numa_free() to __put_task_struct()
sched/fair: Fix endless loop in idle_balance()
sched/core: Fix endless loop in pick_next_task()
sched/fair: Push down check for high priority class task into idle_balance()
sched/rt: Fix picking RT and DL tasks from empty queue
trace: Replace hardcoding of 19 with MAX_NICE
sched: Guarantee task priority in pick_next_task()
sched/idle: Remove stale old file
sched: Put rq's sched_avg under CONFIG_FAIR_GROUP_SCHED
cpuidle/arm64: Remove redundant cpuidle_idle_call()
cpuidle/powernv: Remove redundant cpuidle_idle_call()
sched, nohz: Exclude isolated cores from load balancing
sched: Fix select_task_rq_fair() description comments
workqueue: Replace hardcoding of -20 and 19 with MIN_NICE and MAX_NICE
sys: Replace hardcoding of -20 and 19 with MIN_NICE and MAX_NICE
...
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Pick up fixes before queueing up new changes.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Currently there is lots of hard coding to 19 and -20, to represent
maximum and minimum of nice values.
This patch add three macros in prio.h for maximum, minimum and width
of nice value, and uses it to remove hardcoded values in prio.h.
Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/3994e89327b2b15f992277cdf9f409c516f87d1b.1392103744.git.yangds.fnst@cn.fujitsu.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
[ Collapsed two small patches. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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There is already a macro named DEFAULT_PRIO in prio.h, we can use it
to define NICE_TO_PRIO and PRIO_TO_NICE rather than use hard coding
of (MAX_RT_PRIO + 20).
Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/4e28ec36fb49e8906027cbbdd900ab26a149905e.1392103744.git.yangds.fnst@cn.fujitsu.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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If a PI boosted task policy/priority is modified by a setscheduler()
call we unconditionally dequeue and requeue the task if it is on the
runqueue even if the new priority is lower than the current effective
boosted priority. This can result in undesired reordering of the
priority bucket list.
If the new priority is less or equal than the current effective we
just store the new parameters in the task struct and leave the
scheduler class and the runqueue untouched. This is handled when the
task deboosts itself. Only if the new priority is higher than the
effective boosted priority we apply the change immediately.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
[ Rebase ontop of v3.14-rc1. ]
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Dario Faggioli <raistlin@linux.it>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1391803122-4425-7-git-send-email-bigeasy@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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might_sleep() can tell us where interrupts have been disabled, but we
have no idea what disabled preemption. Add some debug infrastructure.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1391803122-4425-4-git-send-email-bigeasy@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Reason: Bring bakc upstream modification to resolve conflicts
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Track depth in cgroup tree, this is useful for things like
find_matching_se() where you need to get to a common parent of two
sched entities.
Keeping the depth avoids having to calculate it on the spot, which
saves a number of possible cache-misses.
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1328936700.2476.17.camel@laptop
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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As patch "sched: Move the priority specific bits into a new header file" exposes
the priority related macros in linux/sched/prio.h, we don't have to implement
task_nice() in kernel/sched/core.c any more.
This patch implements it in linux/sched/sched.h as static inline function,
saving the kernel stack and enhancing performance a bit.
Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
Cc: clark.williams@gmail.com
Cc: rostedt@goodmis.org
Cc: raistlin@linux.it
Cc: juri.lelli@gmail.com
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1390878045-7096-1-git-send-email-yangds.fnst@cn.fujitsu.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Some macros in kernel/sched/sched.h about priority are
private to kernel/sched. But they are useful to other
parts of the core kernel.
This patch moves these macros from kernel/sched/sched.h to
include/linux/sched/prio.h so that they are available to
other subsystems.
Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
Cc: raistlin@linux.it
Cc: juri.lelli@gmail.com
Cc: clark.williams@gmail.com
Cc: rostedt@goodmis.org
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/2b022810905b52d13238466807f4b2a691577180.1390859827.git.yangds.fnst@cn.fujitsu.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Some bits about priority are defined in linux/sched/rt.h, but
some of them are not only for rt scheduler, such as MAX_PRIO.
This patch move them all into a new header file, linux/sched/prio.h.
Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
Cc: clark.williams@gmail.com
Cc: rostedt@goodmis.org
Cc: raistlin@linux.it
Cc: juri.lelli@gmail.com
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/f7549508a1588da2c613d601748ca9de30fa5dcf.1390859827.git.yangds.fnst@cn.fujitsu.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Conflicts:
kernel/sysctl.c
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Tracing the code that decides the active nodes has made it abundantly clear
that the naive implementation of the faults_from code has issues.
Specifically, the garbage collector in some workloads will access orders
of magnitudes more memory than the threads that do all the active work.
This resulted in the node with the garbage collector being marked the only
active node in the group.
This issue is avoided if we weigh the statistics by CPU use of each task in
the numa group, instead of by how many faults each thread has occurred.
To achieve this, we normalize the number of faults to the fraction of faults
that occurred on each node, and then multiply that fraction by the fraction
of CPU time the task has used since the last time task_numa_placement was
invoked.
This way the nodes in the active node mask will be the ones where the tasks
from the numa group are most actively running, and the influence of eg. the
garbage collector and other do-little threads is properly minimized.
On a 4 node system, using CPU use statistics calculated over a longer interval
results in about 1% fewer page migrations with two 32-warehouse specjbb runs
on a 4 node system, and about 5% fewer page migrations, as well as 1% better
throughput, with two 8-warehouse specjbb runs, as compared with the shorter
term statistics kept by the scheduler.
Signed-off-by: Rik van Riel <riel@redhat.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Chegu Vinod <chegu_vinod@hp.com>
Link: http://lkml.kernel.org/r/1390860228-21539-7-git-send-email-riel@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Use the active_nodes nodemask to make smarter decisions on NUMA migrations.
In order to maximize performance of workloads that do not fit in one NUMA
node, we want to satisfy the following criteria:
1) keep private memory local to each thread
2) avoid excessive NUMA migration of pages
3) distribute shared memory across the active nodes, to
maximize memory bandwidth available to the workload
This patch accomplishes that by implementing the following policy for
NUMA migrations:
1) always migrate on a private fault
2) never migrate to a node that is not in the set of active nodes
for the numa_group
3) always migrate from a node outside of the set of active nodes,
to a node that is in that set
4) within the set of active nodes in the numa_group, only migrate
from a node with more NUMA page faults, to a node with fewer
NUMA page faults, with a 25% margin to avoid ping-ponging
This results in most pages of a workload ending up on the actively
used nodes, with reduced ping-ponging of pages between those nodes.
Signed-off-by: Rik van Riel <riel@redhat.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Chegu Vinod <chegu_vinod@hp.com>
Link: http://lkml.kernel.org/r/1390860228-21539-6-git-send-email-riel@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Track which nodes NUMA faults are triggered from, in other words
the CPUs on which the NUMA faults happened. This uses a similar
mechanism to what is used to track the memory involved in numa faults.
The next patches use this to build up a bitmap of which nodes a
workload is actively running on.
Signed-off-by: Rik van Riel <riel@redhat.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Chegu Vinod <chegu_vinod@hp.com>
Link: http://lkml.kernel.org/r/1390860228-21539-4-git-send-email-riel@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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In order to get a more consistent naming scheme, making it clear
which fault statistics track memory locality, and which track
CPU locality, rename the memory fault statistics.
Suggested-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Rik van Riel <riel@redhat.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Chegu Vinod <chegu_vinod@hp.com>
Link: http://lkml.kernel.org/r/1390860228-21539-3-git-send-email-riel@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Excessive migration of pages can hurt the performance of workloads
that span multiple NUMA nodes. However, it turns out that the
p->numa_migrate_deferred knob is a really big hammer, which does
reduce migration rates, but does not actually help performance.
Now that the second stage of the automatic numa balancing code
has stabilized, it is time to replace the simplistic migration
deferral code with something smarter.
Signed-off-by: Rik van Riel <riel@redhat.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Chegu Vinod <chegu_vinod@hp.com>
Link: http://lkml.kernel.org/r/1390860228-21539-2-git-send-email-riel@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Missing "@" in include/linux/wait.h causes "make htmldocs" to fail
with the following warning messages:
Warning(/home/iida/Repo/linux-next//include/linux/wait.h:304):
No description found for parameter 'cmd1'
Warning(/home/iida/Repo/linux-next//include/linux/wait.h:304):
No description found for parameter 'cmd2'
Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Cc: trivial@kernel.org
Cc: peterz@infradead.org
Link: http://lkml.kernel.org/r/1390321326-23120-1-git-send-email-standby24x7@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf changes from Ingo Molnar:
"Main changes:
Kernel side changes:
- Add SNB/IVB/HSW client uncore memory controller support (Stephane
Eranian)
- Fix various x86/P4 PMU driver bugs (Don Zickus)
Tooling, user visible changes:
- Add several futex 'perf bench' microbenchmarks (Davidlohr Bueso)
- Speed up thread map generation (Don Zickus)
- Introduce 'perf kvm --list-cmds' command line option for use by
scripts (Ramkumar Ramachandra)
- Print the evsel name in the annotate stdio output, prep to fix
support outputting annotation for multiple events, not just for the
first one (Arnaldo Carvalho de Melo)
- Allow setting preferred callchain method in .perfconfig (Jiri Olsa)
- Show in what binaries/modules 'perf probe's are set (Masami
Hiramatsu)
- Support distro-style debuginfo for uprobe in 'perf probe' (Masami
Hiramatsu)
Tooling, internal changes and fixes:
- Use tid in mmap/mmap2 events to find maps (Don Zickus)
- Record the reason for filtering an address_location (Namhyung Kim)
- Apply all filters to an addr_location (Namhyung Kim)
- Merge al->filtered with hist_entry->filtered in report/hists
(Namhyung Kim)
- Fix memory leak when synthesizing thread records (Namhyung Kim)
- Use ui__has_annotation() in 'report' (Namhyung Kim)
- hists browser refactorings to reuse code accross UIs (Namhyung Kim)
- Add support for the new DWARF unwinder library in elfutils (Jiri
Olsa)
- Fix build race in the generation of bison files (Jiri Olsa)
- Further streamline the feature detection display, trimming it a bit
to show just the libraries detected, using VF=1 gets a more verbose
output, showing the less interesting feature checks as well (Jiri
Olsa).
- Check compatible symtab type before loading dso (Namhyung Kim)
- Check return value of filename__read_debuglink() (Stephane Eranian)
- Move some hashing and fs related code from tools/perf/util/ to
tools/lib/ so that it can be used by more tools/ living utilities
(Borislav Petkov)
- Prepare DWARF unwinding code for using an elfutils alternative
unwinding library (Jiri Olsa)
- Fix DWARF unwind max_stack processing (Jiri Olsa)
- Add dwarf unwind 'perf test' entry (Jiri Olsa)
- 'perf probe' improvements including memory leak fixes, sharing the
intlist class with other tools, uprobes/kprobes code sharing and
use of ref_reloc_sym (Masami Hiramatsu)
- Shorten sample symbol resolving by adding cpumode to struct
addr_location (Arnaldo Carvalho de Melo)
- Fix synthesizing mmaps for threads (Don Zickus)
- Fix invalid output on event group stdio report (Namhyung Kim)
- Fixup header alignment in 'perf sched latency' output (Ramkumar
Ramachandra)
- Fix off-by-one error in 'perf timechart record' argv handling
(Ramkumar Ramachandra)
Tooling, cleanups:
- Remove unused thread__find_map function (Jiri Olsa)
- Remove unused simple_strtoul() function (Ramkumar Ramachandra)
Tooling, documentation updates:
- Update function names in debug messages (Ramkumar Ramachandra)
- Update some code references in design.txt (Ramkumar Ramachandra)
- Clarify load-latency information in the 'perf mem' docs (Andi
Kleen)
- Clarify x86 register naming in 'perf probe' docs (Andi Kleen)"
* 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (96 commits)
perf tools: Remove unused simple_strtoul() function
perf tools: Update some code references in design.txt
perf evsel: Update function names in debug messages
perf tools: Remove thread__find_map function
perf annotate: Print the evsel name in the stdio output
perf report: Use ui__has_annotation()
perf tools: Fix memory leak when synthesizing thread records
perf tools: Use tid in mmap/mmap2 events to find maps
perf report: Merge al->filtered with hist_entry->filtered
perf symbols: Apply all filters to an addr_location
perf symbols: Record the reason for filtering an address_location
perf sched: Fixup header alignment in 'latency' output
perf timechart: Fix off-by-one error in 'record' argv handling
perf machine: Factor machine__find_thread to take tid argument
perf tools: Speed up thread map generation
perf kvm: introduce --list-cmds for use by scripts
perf ui hists: Pass evsel to hpp->header/width functions explicitly
perf symbols: Introduce thread__find_cpumode_addr_location
perf session: Change header.misc dump from decimal to hex
perf ui/tui: Reuse generic __hpp__fmt() code
...
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Merge the latest fixes.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge the latest fixes before queueing up new changes.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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This patch adds the PCI ids for the Intel SandyBridge,
IvyBridge, Haswell Client memory controller (IMC).
Cc: mingo@elte.hu
Cc: acme@redhat.com
Cc: ak@linux.intel.com
Cc: zheng.z.yan@intel.com
Cc: peterz@infradead.org
Signed-off-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1392132015-14521-4-git-send-email-eranian@google.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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On Mon, Feb 10, 2014 at 08:45:16AM -0800, Dave Hansen wrote:
> The reason I coded this up was that NMIs were firing off so fast that
> nothing else was getting a chance to run. With this patch, at least the
> printk() would come out and I'd have some idea what was going on.
It will start spewing to early_printk() (which is a lot nicer to use
from NMI context too) when it fails to queue the IRQ-work because its
already enqueued.
It does have the false-positive for when two CPUs trigger the warn
concurrently, but that should be rare and some extra clutter on the
early printk shouldn't be a problem.
Cc: hpa@zytor.com
Cc: tglx@linutronix.de
Cc: dzickus@redhat.com
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: mingo@kernel.org
Fixes: 6a02ad66b2c4 ("perf/x86: Push the duration-logging printk() to IRQ context")
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20140211150116.GO27965@twins.programming.kicks-ass.net
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Calling printk() from NMI context is bad (TM), so move it to IRQ
context.
This also avoids the problem where the printk() time is measured by
the generic NMI duration goo and triggers a second warning.
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Link: http://lkml.kernel.org/n/tip-75dv35xf6dhhmeb7nq6fua31@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull hweight type fix from Ingo Molnar:
"This lone commit makes sure that __const_hweight8() is unsigned, which
addresses a build warning if code is built with -Wsign-compare.
I hope the type cast in this cleanup is fine - another option would be
to eliminate the double unary negation and use a construct with more
obvious integer type characteristics, along the lines of:
((w) & (1ULL << 1) ? 1U : 0U)
or so"
* 'core-types-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
bitops: Fix signedness of compile-time hweight implementations
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Enabling '-Wsign-compare' compiler warnings on code that includes
include/linux/bitops.h can generate the following warning:
In file included from include/linux/kernel.h:10:0,
from <random filename>:48:
include/linux/bitops.h: In function 'hweight_long':
include/linux/bitops.h:77:26: error: signed and unsigned type in conditional expression [-Werror=sign-compare]
(converted to an error with -Werror)
This is due to the use of the logical negation operator '!' in the
__const_hweight8 macro in include/asm-generic/bitops/const_hweight.h.
The use of that operator here results in a signed value.
Fix by explicitly casting the __const_hweight8 macro expansion to
'unsigned int'. While here, clean up several checkpatch.pl warnings.
Signed-off-by: Paul Walmsley <pwalmsley@nvidia.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/alpine.DEB.2.02.1312180459580.30198@tamien
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull RCU updates from Ingo Molnar:
"Main changes:
- Torture-test changes, including refactoring of rcutorture and
introduction of a vestigial locktorture.
- Real-time latency fixes.
- Documentation updates.
- Miscellaneous fixes"
* 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (77 commits)
rcu: Provide grace-period piggybacking API
rcu: Ensure kernel/rcu/rcu.h can be sourced/used stand-alone
rcu: Fix sparse warning for rcu_expedited from kernel/ksysfs.c
notifier: Substitute rcu_access_pointer() for rcu_dereference_raw()
Documentation/memory-barriers.txt: Clarify release/acquire ordering
rcutorture: Save kvm.sh output to log
rcutorture: Add a lock_busted to test the test
rcutorture: Place kvm-test-1-run.sh output into res directory
rcutorture: Rename TREE_RCU-Kconfig.txt
locktorture: Add kvm-recheck.sh plug-in for locktorture
rcutorture: Gracefully handle NULL cleanup hooks
locktorture: Add vestigial locktorture configuration
rcutorture: Introduce "rcu" directory level underneath configs
rcutorture: Rename kvm-test-1-rcu.sh
rcutorture: Remove RCU dependencies from ver_functions.sh API
rcutorture: Create CFcommon file for common Kconfig parameters
rcutorture: Create config files for scripted test-the-test testing
rcutorture: Add an rcu_busted to test the test
locktorture: Add a lock-torture kernel module
rcutorture: Abstract kvm-recheck.sh
...
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git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu
Pull RCU update from Paul E. McKenney:
" [...] one late-breaking commit. This one was requested for 3.15 by Peter Zijlstra.
It is low risk because it adds a new in-kernel API with minimal changes to the
existing code. Those minimal changes are the addition of memory barriers and
ACCESS_ONCE() macro calls, neither of which should be able to break things.
This commit has passed significant rcutorture testing, with these additional
additions to rcutorture slated for 3.16. This commit has also been exposed to
-next testing. "
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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The following pattern is currently not well supported by RCU:
1. Make data element inaccessible to RCU readers.
2. Do work that probably lasts for more than one grace period.
3. Do something to make sure RCU readers in flight before #1 above
have completed.
Here are some things that could currently be done:
a. Do a synchronize_rcu() unconditionally at either #1 or #3 above.
This works, but imposes needless work and latency.
b. Post an RCU callback at #1 above that does a wakeup, then
wait for the wakeup at #3. This works well, but likely results
in an extra unneeded grace period. Open-coding this is also
a bit more semi-tricky code than would be good.
This commit therefore adds get_state_synchronize_rcu() and
cond_synchronize_rcu() APIs. Call get_state_synchronize_rcu() at #1
above and pass its return value to cond_synchronize_rcu() at #3 above.
This results in a call to synchronize_rcu() if no grace period has
elapsed between #1 and #3, but requires only a load, comparison, and
memory barrier if a full grace period did elapse.
Requested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu
Pull RCU updates from Paul E. McKenney:
* Update RCU documentation. These were posted to LKML at
https://lkml.org/lkml/2014/2/17/555.
* Miscellaneous fixes. These were posted to LKML at
https://lkml.org/lkml/2014/2/17/530. Note that two of these
are RCU changes to other maintainer's trees: add1f0995454
(fs) and 8857563b819b (notifer), both of which substitute
rcu_access_pointer() for rcu_dereference_raw().
* Real-time latency fixes. These were posted to LKML at
https://lkml.org/lkml/2014/2/17/544.
* Torture-test changes, including refactoring of rcutorture
and introduction of a vestigial locktorture. These were posted
to LKML at https://lkml.org/lkml/2014/2/17/599.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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torture.2014.02.23a: locktorture addition and rcutorture changes
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The specific torture modules (like rcutorture) need to call
torture_cleanup() in any case, so this commit makes torture_cleanup()
deal with torture_shutdown_cleanup() and torture_stutter_cleanup() so
that the specific modules don't have to deal with these details.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
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Stopping of kthreads is not RCU-specific, so this commit abstracts
out torture_stop_kthread(), saving a few lines of code in the process.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
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Creation of kthreads is not RCU-specific, so this commit abstracts
out torture_create_kthread(), saving a few tens of lines of code in
the process.
This change requires modifying VERBOSE_TOROUT_ERRSTRING() to take a
non-const string, so that _torture_create_kthread() can avoid an
open-coded substitute.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
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Not all of the rcutorture kthreads waited for kthread_should_stop()
before returning from their top-level functions, and none of them
used torture_shutdown_absorb() properly. These problems can result in
segfaults and hangs at shutdown time, and some recent changes perturbed
timing sufficiently to make them much more probable. This commit
therefore creates a torture_kthread_stopping() function that does the
proper kthread shutdown dance in one centralized location.
Accommodate this grouping by making VERBOSE_TOROUT_STRING() capable of
taking a non-const string as its argument, which allows the new
torture_kthread_stopping() to pass its "title" argument directly to
the updated version of VERBOSE_TOROUT_STRING().
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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Because auto-shutdown of torture testing is not specific to RCU,
this commit moves the auto-shutdown function to kernel/torture.c.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
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Because stuttering the test load (stopping and restarting it) is useful
for non-RCU testing, this commit moves the load-stuttering functionality
to kernel/torture.c.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
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This commit introduces the torture_must_stop() function in order to
keep use of the fullstop variable local to kernel/torture.c. There
is also a torture_must_stop_irq() counterpart for use from RCU callbacks,
timeout handlers, and the like.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
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Because handling the race between rmmod and system shutdown is not
specific to RCU, this commit abstracts torture_shutdown_notify(),
placing this code into kernel/torture.c. This change also allows
fullstop_mutex to be private to kernel/torture.c.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
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This commit creates a torture_cleanup() that handles the generic
cleanup actions local to kernel/torture.c.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
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This commit creates torture_init_begin() and torture_init_end() functions
to abstract locking and allow the torture_type and verbose variables
in kernel/torture.o to become static. With a bit more abstraction,
fullstop_mutex will also become static.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
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Because online/offline torturing is not specific to RCU, this commit
abstracts it into the kernel/torture.c module to allow other torture
tests to use it.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
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