Commit 2cb8600e authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
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sched: documentation: place_entity() comments 



Add a few comments to place_entity(). No code changed.

Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 10b77724

kernel/sched_fair.c

+9 −2
Original line number Diff line number Diff line
@@ -473,19 +473,26 @@ place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int initial) 
	} else if (sched_feat(APPROX_AVG) && cfs_rq->nr_running)

		vruntime += sched_vslice(cfs_rq)/2;



	/*

	 * The 'current' period is already promised to the current tasks,

	 * however the extra weight of the new task will slow them down a

	 * little, place the new task so that it fits in the slot that

	 * stays open at the end.

	 */

	if (initial && sched_feat(START_DEBIT))

		vruntime += sched_vslice_add(cfs_rq, se);



	if (!initial) {

		/* sleeps upto a single latency don't count. */

		if (sched_feat(NEW_FAIR_SLEEPERS) && entity_is_task(se) &&

				task_of(se)->policy != SCHED_BATCH)

			vruntime -= sysctl_sched_latency;



		vruntime = max_t(s64, vruntime, se->vruntime);

		/* ensure we never gain time by being placed backwards. */

		vruntime = max_vruntime(se->vruntime, vruntime);

	}



	se->vruntime = vruntime;



}



static void