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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2009-09-16 13:44:33 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-09-16 16:44:32 +0200 |
| commit | 3b6408942206f940dd538e980e9904e48f4b64f8 (patch) | |
| tree | 7e0a0dc37d07e0308ef2294a5de1cd1ea42a388c /kernel/sched_fair.c | |
| parent | 7c423e98856df9b941223a7e7845b2502ad84b00 (diff) | |
| download | linux-3b6408942206f940dd538e980e9904e48f4b64f8.tar.bz2 | |
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>
Diffstat (limited to 'kernel/sched_fair.c')
| -rw-r--r-- | kernel/sched_fair.c | 23 |
1 files changed, 9 insertions, 14 deletions
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; |