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sched: disable forced preemption by default
Implement feature bit to disable forced preemption. This way it can be checked whether a workload is overscheduling or not. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -444,13 +444,15 @@ enum {
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SCHED_FEAT_START_DEBIT = 2,
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SCHED_FEAT_TREE_AVG = 4,
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SCHED_FEAT_APPROX_AVG = 8,
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SCHED_FEAT_WAKEUP_PREEMPT = 16,
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};
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const_debug unsigned int sysctl_sched_features =
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SCHED_FEAT_NEW_FAIR_SLEEPERS *1 |
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SCHED_FEAT_START_DEBIT *1 |
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SCHED_FEAT_TREE_AVG *0 |
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SCHED_FEAT_APPROX_AVG *0;
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SCHED_FEAT_APPROX_AVG *0 |
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SCHED_FEAT_WAKEUP_PREEMPT *1;
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#define sched_feat(x) (sysctl_sched_features & SCHED_FEAT_##x)
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@ -626,7 +626,7 @@ static void entity_tick(struct cfs_rq *cfs_rq, struct sched_entity *curr)
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*/
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update_curr(cfs_rq);
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if (cfs_rq->nr_running > 1)
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if (cfs_rq->nr_running > 1 || !sched_feat(WAKEUP_PREEMPT))
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check_preempt_tick(cfs_rq, curr);
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}
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@ -828,18 +828,20 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p)
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return;
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}
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while (!is_same_group(se, pse)) {
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se = parent_entity(se);
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pse = parent_entity(pse);
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if (sched_feat(WAKEUP_PREEMPT)) {
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while (!is_same_group(se, pse)) {
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se = parent_entity(se);
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pse = parent_entity(pse);
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}
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delta = se->vruntime - pse->vruntime;
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gran = sysctl_sched_wakeup_granularity;
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if (unlikely(se->load.weight != NICE_0_LOAD))
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gran = calc_delta_fair(gran, &se->load);
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if (delta > gran)
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resched_task(curr);
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}
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delta = se->vruntime - pse->vruntime;
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gran = sysctl_sched_wakeup_granularity;
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if (unlikely(se->load.weight != NICE_0_LOAD))
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gran = calc_delta_fair(gran, &se->load);
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if (delta > gran)
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resched_task(curr);
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}
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static struct task_struct *pick_next_task_fair(struct rq *rq)
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