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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>
This commit is contained in:
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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2
kernel/sched/sched.h
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@@ -230,7 +230,7 @@ struct cfs_rq {
* the FAIR_GROUP_SCHED case).
*/
u64 runnable_load_avg, blocked_load_avg;
atomic64_t decay_counter;
atomic64_t decay_counter, removed_load;
u64 last_decay;
#endif
#ifdef CONFIG_FAIR_GROUP_SCHED