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Commit d25ce4cd authored by Ingo Molnar's avatar Ingo Molnar
Browse files

sched: cache hot buddy 



Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 1fc8afa4

kernel/sched.c

+9 −7
Original line number Diff line number Diff line
@@ -625,20 +625,22 @@ enum { 
	SCHED_FEAT_NEW_FAIR_SLEEPERS	= 1,

	SCHED_FEAT_WAKEUP_PREEMPT	= 2,

	SCHED_FEAT_START_DEBIT		= 4,

	SCHED_FEAT_HRTICK		= 8,

	SCHED_FEAT_DOUBLE_TICK		= 16,

	SCHED_FEAT_SYNC_WAKEUPS		= 32,

	SCHED_FEAT_AFFINE_WAKEUPS	= 64,

	SCHED_FEAT_AFFINE_WAKEUPS	= 8,

	SCHED_FEAT_CACHE_HOT_BUDDY	= 16,

	SCHED_FEAT_HRTICK		= 32,

	SCHED_FEAT_DOUBLE_TICK		= 64,

	SCHED_FEAT_SYNC_WAKEUPS		= 128,

};



const_debug unsigned int sysctl_sched_features =

		SCHED_FEAT_NEW_FAIR_SLEEPERS	* 1 |

		SCHED_FEAT_WAKEUP_PREEMPT	* 1 |

		SCHED_FEAT_START_DEBIT		* 1 |

		SCHED_FEAT_AFFINE_WAKEUPS	* 1 |

		SCHED_FEAT_CACHE_HOT_BUDDY	* 1 |

		SCHED_FEAT_HRTICK		* 1 |

		SCHED_FEAT_DOUBLE_TICK		* 0 |

		SCHED_FEAT_SYNC_WAKEUPS		* 0 |

		SCHED_FEAT_AFFINE_WAKEUPS	* 1;

		SCHED_FEAT_SYNC_WAKEUPS		* 0;



#define sched_feat(x) (sysctl_sched_features & SCHED_FEAT_##x)
@@ -1519,7 +1521,7 @@ task_hot(struct task_struct *p, u64 now, struct sched_domain *sd) 
	/*

	 * Buddy candidates are cache hot:

	 */

	if (&p->se == cfs_rq_of(&p->se)->next)

	if (sched_feat(CACHE_HOT_BUDDY) && (&p->se == cfs_rq_of(&p->se)->next))

		return 1;



	if (p->sched_class != &fair_sched_class)