diff options
| author | Morten Rasmussen <morten.rasmussen@arm.com> | 2015-01-13 13:50:46 +0000 |
|---|---|---|
| committer | Leo Yan <leo.yan@linaro.org> | 2016-05-10 16:49:50 +0800 |
| commit | f0f739d887a4f144ab4937e619288d4cede2cc91 (patch) | |
| tree | 514b7aef24b1a5904260ddcc46c3e1960687e95c | |
| parent | 4ce990ec65231af6a148c2c0e6b4745fc1d12368 (diff) | |
sched: Introduce SD_SHARE_CAP_STATES sched_domain flag
cpufreq is currently keeping it a secret which cpus are sharing
clock source. The scheduler needs to know about clock domains as well
to become more energy aware. The SD_SHARE_CAP_STATES domain flag
indicates whether cpus belonging to the sched_domain share capacity
states (P-states).
There is no connection with cpufreq (yet). The flag must be set by
the arch specific topology code.
cc: Russell King <linux@arm.linux.org.uk>
cc: Ingo Molnar <mingo@redhat.com>
cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Morten Rasmussen <morten.rasmussen@arm.com>
| -rw-r--r-- | arch/arm/kernel/topology.c | 3 | ||||
| -rw-r--r-- | include/linux/sched.h | 1 | ||||
| -rw-r--r-- | kernel/sched/core.c | 10 |
3 files changed, 10 insertions, 4 deletions
diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c index 614554765e44..38e7be162b79 100644 --- a/arch/arm/kernel/topology.c +++ b/arch/arm/kernel/topology.c @@ -277,7 +277,8 @@ void store_cpu_topology(unsigned int cpuid) static inline int cpu_corepower_flags(void) { - return SD_SHARE_PKG_RESOURCES | SD_SHARE_POWERDOMAIN; + return SD_SHARE_PKG_RESOURCES | SD_SHARE_POWERDOMAIN | \ + SD_SHARE_CAP_STATES; } static struct sched_domain_topology_level arm_topology[] = { diff --git a/include/linux/sched.h b/include/linux/sched.h index 5bee272a86d8..09e2d43406eb 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -989,6 +989,7 @@ extern void wake_up_q(struct wake_q_head *head); #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */ #define SD_OVERLAP 0x2000 /* sched_domains of this level overlap */ #define SD_NUMA 0x4000 /* cross-node balancing */ +#define SD_SHARE_CAP_STATES 0x8000 /* Domain members share capacity state */ #ifdef CONFIG_SCHED_SMT static inline int cpu_smt_flags(void) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index f1b1c9eaeb10..2863d223c07e 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -5775,7 +5775,8 @@ static int sd_degenerate(struct sched_domain *sd) SD_BALANCE_EXEC | SD_SHARE_CPUCAPACITY | SD_SHARE_PKG_RESOURCES | - SD_SHARE_POWERDOMAIN)) { + SD_SHARE_POWERDOMAIN | + SD_SHARE_CAP_STATES)) { if (sd->groups != sd->groups->next) return 0; } @@ -5807,7 +5808,8 @@ sd_parent_degenerate(struct sched_domain *sd, struct sched_domain *parent) SD_SHARE_CPUCAPACITY | SD_SHARE_PKG_RESOURCES | SD_PREFER_SIBLING | - SD_SHARE_POWERDOMAIN); + SD_SHARE_POWERDOMAIN | + SD_SHARE_CAP_STATES); if (nr_node_ids == 1) pflags &= ~SD_SERIALIZE; } @@ -6472,6 +6474,7 @@ static int sched_domains_curr_level; * SD_SHARE_PKG_RESOURCES - describes shared caches * SD_NUMA - describes NUMA topologies * SD_SHARE_POWERDOMAIN - describes shared power domain + * SD_SHARE_CAP_STATES - describes shared capacity states * * Odd one out: * SD_ASYM_PACKING - describes SMT quirks @@ -6481,7 +6484,8 @@ static int sched_domains_curr_level; SD_SHARE_PKG_RESOURCES | \ SD_NUMA | \ SD_ASYM_PACKING | \ - SD_SHARE_POWERDOMAIN) + SD_SHARE_POWERDOMAIN | \ + SD_SHARE_CAP_STATES) static struct sched_domain * sd_init(struct sched_domain_topology_level *tl, int cpu) |