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sched: documentation: place_entity() comments 

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

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2007-11-09 22:39:37 +01:00 committed by Ingo Molnar
parent 10b777246c
commit 2cb8600e6b
1 changed files with 9 additions and 2 deletions
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11
kernel/sched_fair.c
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@ -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) } else if (sched_feat(APPROX_AVG) && cfs_rq->nr_running)
vruntime += sched_vslice(cfs_rq)/2; 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)) if (initial && sched_feat(START_DEBIT))
vruntime += sched_vslice_add(cfs_rq, se); vruntime += sched_vslice_add(cfs_rq, se);
if (!initial) { if (!initial) {
/* sleeps upto a single latency don't count. */
if (sched_feat(NEW_FAIR_SLEEPERS) && entity_is_task(se) && if (sched_feat(NEW_FAIR_SLEEPERS) && entity_is_task(se) &&
task_of(se)->policy != SCHED_BATCH) task_of(se)->policy != SCHED_BATCH)
vruntime -= sysctl_sched_latency; 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; se->vruntime = vruntime;
} }
static void static void