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| author | Morten Rasmussen <morten.rasmussen@arm.com> | 2018-07-04 13:17:39 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2018-09-10 12:05:48 +0300 |
| commit | df054e8445a4011e3d693c2268129c0456108663 (patch) | |
| tree | 038941b242044a465ce5662d559495849aa95009 /kernel/sched/fair.c | |
| parent | e1799a80a4f5a463f252b7325da8bb66dfd55471 (diff) | |
| download | linux-df054e8445a4011e3d693c2268129c0456108663.tar.xz | |
sched/topology: Add static_key for asymmetric CPU capacity optimizations
The existing asymmetric CPU capacity code should cause minimal overhead
for others. Putting it behind a static_key, it has been done for SMT
optimizations, would make it easier to extend and improve without
causing harm to others moving forward.
Signed-off-by: Morten Rasmussen <morten.rasmussen@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: dietmar.eggemann@arm.com
Cc: gaku.inami.xh@renesas.com
Cc: valentin.schneider@arm.com
Cc: vincent.guittot@linaro.org
Link: http://lkml.kernel.org/r/1530699470-29808-2-git-send-email-morten.rasmussen@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched/fair.c')
| -rw-r--r-- | kernel/sched/fair.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index f808ddf2a868..3e5071aeb117 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -6188,6 +6188,9 @@ static int wake_cap(struct task_struct *p, int cpu, int prev_cpu) { long min_cap, max_cap; + if (!static_branch_unlikely(&sched_asym_cpucapacity)) + return 0; + min_cap = min(capacity_orig_of(prev_cpu), capacity_orig_of(cpu)); max_cap = cpu_rq(cpu)->rd->max_cpu_capacity; |