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| author |   Vincent Guittot <vincent.guittot@linaro.org> | 2018-07-19 14:00:06 +0200 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2018-07-25 11:41:05 +0200 |
| commit | 2e62c4743adc4c7bfcbc1f45118fc7bec58cf30a (patch) | |
| tree | ab27fa04b39f5636b852e243a3f0581f65af4dc3 /kernel/sched/cpufreq_schedutil.c | |
| parent | Merge branch 'sched/urgent' into sched/core, to pick up fixes (diff) | |
| download | linux-dev-2e62c4743adc4c7bfcbc1f45118fc7bec58cf30a.tar.xz linux-dev-2e62c4743adc4c7bfcbc1f45118fc7bec58cf30a.zip | |
sched/fair: Remove #ifdefs from scale_rt_capacity()
Reuse cpu_util_irq() that has been defined for schedutil and set irq util
to 0 when !CONFIG_IRQ_TIME_ACCOUNTING.
But the compiler is not able to optimize the sequence (at least with
aarch64 GCC 7.2.1):
free *= (max - irq);
free /= max;
when irq is fixed to 0
Add a new inline function scale_irq_capacity() that will scale utilization
when irq is accounted. Reuse this funciton in schedutil which applies
similar formula.
Suggested-by: Ingo Molnar <mingo@redhat.com>
Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: rjw@rjwysocki.net
Link: http://lkml.kernel.org/r/1532001606-6689-1-git-send-email-vincent.guittot@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to '')
| -rw-r--r-- | kernel/sched/cpufreq_schedutil.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c index 97dcd4472a0e..3fffad3bc8a8 100644 --- a/kernel/sched/cpufreq_schedutil.c +++ b/kernel/sched/cpufreq_schedutil.c @@ -247,8 +247,7 @@ static unsigned long sugov_get_util(struct sugov_cpu *sg_cpu) * U' = irq + ------- * U * max */ - util *= (max - irq); - util /= max; + util = scale_irq_capacity(util, irq, max); util += irq; /* |