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Commit b85d0667 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

sched: introduce SCHED_FEAT_SYNC_WAKEUPS, turn it off 



turn off sync wakeups by default. They are not needed anymore - the
buddy logic should be smart enough to keep the system from
overscheduling.

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 0bbd3336

kernel/sched.c

+6 −1
Original line number Diff line number Diff line
@@ -627,6 +627,7 @@ enum { 
	SCHED_FEAT_START_DEBIT		= 4,

	SCHED_FEAT_HRTICK		= 8,

	SCHED_FEAT_DOUBLE_TICK		= 16,

	SCHED_FEAT_SYNC_WAKEUPS		= 32,

};



const_debug unsigned int sysctl_sched_features =
@@ -634,7 +635,8 @@ const_debug unsigned int sysctl_sched_features = 
		SCHED_FEAT_WAKEUP_PREEMPT	* 1 |

		SCHED_FEAT_START_DEBIT		* 1 |

		SCHED_FEAT_HRTICK		* 1 |

		SCHED_FEAT_DOUBLE_TICK		* 0;

		SCHED_FEAT_DOUBLE_TICK		* 0 |

		SCHED_FEAT_SYNC_WAKEUPS		* 0;



#define sched_feat(x) (sysctl_sched_features & SCHED_FEAT_##x)
@@ -1916,6 +1918,9 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state, int sync) 
	long old_state;

	struct rq *rq;



	if (!sched_feat(SYNC_WAKEUPS))

		sync = 0;



	smp_wmb();

	rq = task_rq_lock(p, &flags);

	old_state = p->state;