sched: Account for blocked load waking back up

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When a running entity blocks we migrate its tracked load to
cfs_rq->blocked_runnable_avg.  In the sleep case this occurs while holding
rq->lock and so is a natural transition.  Wake-ups however, are potentially
asynchronous in the presence of migration and so special care must be taken.

We use an atomic counter to track such migrated load, taking care to match this
with the previously introduced decay counters so that we don't migrate too much
load.

Signed-off-by: Paul Turner <pjt@google.com>
Reviewed-by: Ben Segall <bsegall@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20120823141506.726077467@google.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

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Paul Turner 2012-10-04 13:18:30 +02:00 • committed by Ingo Molnar

parent 0a74bef8be

commit aff3e49884

2 changed files with 81 additions and 21 deletions

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100

kernel/sched/fair.c

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2

kernel/sched/sched.h

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