diff options
| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2009-09-16 15:44:33 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-09-16 18:44:32 +0400 |
| commit | 3b6408942206f940dd538e980e9904e48f4b64f8 (patch) | |
| tree | 7e0a0dc37d07e0308ef2294a5de1cd1ea42a388c | |
| parent | 7c423e98856df9b941223a7e7845b2502ad84b00 (diff) | |
| download | linux-3b6408942206f940dd538e980e9904e48f4b64f8.tar.xz | |
sched: Optimize cgroup vs wakeup a bit
We don't need to call update_shares() for each domain we iterate,
just got the largets one.
However, we should call it before wake_affine() as well, so that
that can use up-to-date values too.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | kernel/sched.c | 7 | ||||
| -rw-r--r-- | kernel/sched_fair.c | 23 | ||||
| -rw-r--r-- | kernel/sched_features.h | 2 |
3 files changed, 10 insertions, 22 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index af04ede6dd2f..5049d959bb26 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -376,13 +376,6 @@ static inline void set_task_rq(struct task_struct *p, unsigned int cpu) #else -#ifdef CONFIG_SMP -static int root_task_group_empty(void) -{ - return 1; -} -#endif - static inline void set_task_rq(struct task_struct *p, unsigned int cpu) { } static inline struct task_group *task_group(struct task_struct *p) { diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index acf16a8d934b..722d392b0dac 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -1348,7 +1348,7 @@ find_idlest_cpu(struct sched_group *group, struct task_struct *p, int this_cpu) */ static int select_task_rq_fair(struct task_struct *p, int sd_flag, int flags) { - struct sched_domain *tmp, *sd = NULL; + struct sched_domain *tmp, *shares = NULL, *sd = NULL; int cpu = smp_processor_id(); int prev_cpu = task_cpu(p); int new_cpu = cpu; @@ -1387,22 +1387,14 @@ static int select_task_rq_fair(struct task_struct *p, int sd_flag, int flags) break; } - switch (sd_flag) { - case SD_BALANCE_WAKE: - if (!sched_feat(LB_WAKEUP_UPDATE)) - break; - case SD_BALANCE_FORK: - case SD_BALANCE_EXEC: - if (root_task_group_empty()) - break; - update_shares(tmp); - default: - break; - } - if (want_affine && (tmp->flags & SD_WAKE_AFFINE) && cpumask_test_cpu(prev_cpu, sched_domain_span(tmp))) { + if (sched_feat(LB_SHARES_UPDATE)) { + update_shares(tmp); + shares = tmp; + } + if (wake_affine(tmp, p, sync)) { new_cpu = cpu; goto out; @@ -1417,6 +1409,9 @@ static int select_task_rq_fair(struct task_struct *p, int sd_flag, int flags) sd = tmp; } + if (sd && sd != shares && sched_feat(LB_SHARES_UPDATE)) + update_shares(sd); + while (sd) { struct sched_group *group; int weight; diff --git a/kernel/sched_features.h b/kernel/sched_features.h index fd375675f834..d5059fd761d9 100644 --- a/kernel/sched_features.h +++ b/kernel/sched_features.h @@ -107,7 +107,7 @@ SCHED_FEAT(ARCH_POWER, 0) SCHED_FEAT(HRTICK, 0) SCHED_FEAT(DOUBLE_TICK, 0) SCHED_FEAT(LB_BIAS, 1) -SCHED_FEAT(LB_WAKEUP_UPDATE, 1) +SCHED_FEAT(LB_SHARES_UPDATE, 1) SCHED_FEAT(ASYM_EFF_LOAD, 1) /* |