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sched/fair: Convert arch_scale_cpu_capacity() from weak function to #define

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Bring arch_scale_cpu_capacity() in line with the recent change of its
arch_scale_freq_capacity() sibling in commit dfbca41f34 ("sched:
Optimize freq invariant accounting") from weak function to #define to
allow inlining of the function.

While at it, remove the ARCH_CAPACITY sched_feature as well. With the
change to #define there isn't a straightforward way to allow runtime
switch between an arch implementation and the default implementation of
arch_scale_cpu_capacity() using sched_feature. The default was to use
the arch-specific implementation, but only the arm architecture provides
one and that is essentially equivalent to the default implementation.

Signed-off-by: Morten Rasmussen <morten.rasmussen@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Dietmar Eggemann <Dietmar.Eggemann@arm.com>
Cc: 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: Thomas Gleixner <tglx@linutronix.de>
Cc: daniel.lezcano@linaro.org
Cc: mturquette@baylibre.com
Cc: pang.xunlei@zte.com.cn
Cc: rjw@rjwysocki.net
Cc: sgurrappadi@nvidia.com
Cc: vincent.guittot@linaro.org
Cc: yuyang.du@intel.com
Link: http://lkml.kernel.org/r/1439569394-11974-3-git-send-email-morten.rasmussen@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Morten Rasmussen 2015-08-14 17:23:10 +01:00 • committed by Ingo Molnar
parent e0f5f3afd2
commit 8cd5601c50
3 changed files with 12 additions and 26 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

22
kernel/sched/fair.c
View file

@ -6054,19 +6054,6 @@ static inline int get_sd_load_idx(struct sched_domain *sd,
return load_idx; return load_idx;
} }
static unsigned long default_scale_cpu_capacity(struct sched_domain *sd, int cpu)
{
if ((sd->flags & SD_SHARE_CPUCAPACITY) && (sd->span_weight > 1))
return sd->smt_gain / sd->span_weight;
return SCHED_CAPACITY_SCALE;
}
unsigned long __weak arch_scale_cpu_capacity(struct sched_domain *sd, int cpu)
{
return default_scale_cpu_capacity(sd, cpu);
}
static unsigned long scale_rt_capacity(int cpu) static unsigned long scale_rt_capacity(int cpu)
{ {
struct rq *rq = cpu_rq(cpu); struct rq *rq = cpu_rq(cpu);
@ -6096,16 +6083,9 @@ static unsigned long scale_rt_capacity(int cpu)
static void update_cpu_capacity(struct sched_domain *sd, int cpu) static void update_cpu_capacity(struct sched_domain *sd, int cpu)
{ {
unsigned long capacity = SCHED_CAPACITY_SCALE; unsigned long capacity = arch_scale_cpu_capacity(sd, cpu);
struct sched_group *sdg = sd->groups; struct sched_group *sdg = sd->groups;
if (sched_feat(ARCH_CAPACITY))
capacity *= arch_scale_cpu_capacity(sd, cpu);
else
capacity *= default_scale_cpu_capacity(sd, cpu);
capacity >>= SCHED_CAPACITY_SHIFT;
cpu_rq(cpu)->cpu_capacity_orig = capacity; cpu_rq(cpu)->cpu_capacity_orig = capacity;
capacity *= scale_rt_capacity(cpu); capacity *= scale_rt_capacity(cpu);

5
kernel/sched/features.h
View file

@ -36,11 +36,6 @@ SCHED_FEAT(CACHE_HOT_BUDDY, true)
*/ */
SCHED_FEAT(WAKEUP_PREEMPTION, true) SCHED_FEAT(WAKEUP_PREEMPTION, true)
/*
* Use arch dependent cpu capacity functions
*/
SCHED_FEAT(ARCH_CAPACITY, true)
SCHED_FEAT(HRTICK, false) SCHED_FEAT(HRTICK, false)
SCHED_FEAT(DOUBLE_TICK, false) SCHED_FEAT(DOUBLE_TICK, false)
SCHED_FEAT(LB_BIAS, true) SCHED_FEAT(LB_BIAS, true)

11
kernel/sched/sched.h
View file

@ -1394,6 +1394,17 @@ unsigned long arch_scale_freq_capacity(struct sched_domain *sd, int cpu)
} }
#endif #endif
#ifndef arch_scale_cpu_capacity
static __always_inline
unsigned long arch_scale_cpu_capacity(struct sched_domain *sd, int cpu)
{
if ((sd->flags & SD_SHARE_CPUCAPACITY) && (sd->span_weight > 1))
return sd->smt_gain / sd->span_weight;
return SCHED_CAPACITY_SCALE;
}
#endif
static inline void sched_rt_avg_update(struct rq *rq, u64 rt_delta) static inline void sched_rt_avg_update(struct rq *rq, u64 rt_delta)
{ {
rq->rt_avg += rt_delta * arch_scale_freq_capacity(NULL, cpu_of(rq)); rq->rt_avg += rt_delta * arch_scale_freq_capacity(NULL, cpu_of(rq));