forked from luck/tmp_suning_uos_patched
sched: revert recent sync wakeup changes
Intel reported a 10% regression (mysql+sysbench) on a 16-way machine with these patches: 1596e29: sched: symmetric sync vs avg_overlap d942fb6: sched: fix sync wakeups Revert them. Reported-by: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com> Bisected-by: Lin Ming <ming.m.lin@intel.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -2266,16 +2266,6 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state, int sync)
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if (!sched_feat(SYNC_WAKEUPS))
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sync = 0;
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if (!sync) {
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if (current->se.avg_overlap < sysctl_sched_migration_cost &&
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p->se.avg_overlap < sysctl_sched_migration_cost)
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sync = 1;
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} else {
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if (current->se.avg_overlap >= sysctl_sched_migration_cost ||
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p->se.avg_overlap >= sysctl_sched_migration_cost)
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sync = 0;
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}
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#ifdef CONFIG_SMP
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if (sched_feat(LB_WAKEUP_UPDATE)) {
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struct sched_domain *sd;
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@ -1191,15 +1191,20 @@ wake_affine(struct sched_domain *this_sd, struct rq *this_rq,
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int idx, unsigned long load, unsigned long this_load,
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unsigned int imbalance)
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{
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struct task_struct *curr = this_rq->curr;
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struct task_group *tg;
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unsigned long tl = this_load;
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unsigned long tl_per_task;
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struct task_group *tg;
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unsigned long weight;
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int balanced;
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if (!(this_sd->flags & SD_WAKE_AFFINE) || !sched_feat(AFFINE_WAKEUPS))
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return 0;
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if (sync && (curr->se.avg_overlap > sysctl_sched_migration_cost ||
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p->se.avg_overlap > sysctl_sched_migration_cost))
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sync = 0;
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/*
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* If sync wakeup then subtract the (maximum possible)
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* effect of the currently running task from the load
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@ -1426,7 +1431,9 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p, int sync)
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if (!sched_feat(WAKEUP_PREEMPT))
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return;
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if (sched_feat(WAKEUP_OVERLAP) && sync) {
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if (sched_feat(WAKEUP_OVERLAP) && (sync ||
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(se->avg_overlap < sysctl_sched_migration_cost &&
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pse->avg_overlap < sysctl_sched_migration_cost))) {
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resched_task(curr);
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return;
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}
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