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| author | Ingo Molnar <mingo@elte.hu> | 2007-08-28 12:53:24 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2007-08-28 12:53:24 +0200 |
| commit | 213c8af67f21c1dc0d50940b159d9521c95f3c89 (patch) | |
| tree | b3f594889a460bcec385192d8675b428616d31b7 /kernel | |
| parent | b77d69db9f4ba03b2ed17e383c2d73ca89f5ab14 (diff) | |
| download | lwn-213c8af67f21c1dc0d50940b159d9521c95f3c89.tar.gz lwn-213c8af67f21c1dc0d50940b159d9521c95f3c89.zip | |
sched: small schedstat fix
small schedstat fix: the cfs_rq->wait_runtime 'sum of all runtimes'
statistics counters missed newly forked tasks and thus had a constant
negative skew. Fix this.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Mike Galbraith <efault@gmx.de>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched_fair.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index 0c718857176f..75f025da6f7c 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -1121,8 +1121,10 @@ static void task_new_fair(struct rq *rq, struct task_struct *p) * The statistical average of wait_runtime is about * -granularity/2, so initialize the task with that: */ - if (sysctl_sched_features & SCHED_FEAT_START_DEBIT) + if (sysctl_sched_features & SCHED_FEAT_START_DEBIT) { p->se.wait_runtime = -(sched_granularity(cfs_rq) / 2); + schedstat_add(cfs_rq, wait_runtime, se->wait_runtime); + } __enqueue_entity(cfs_rq, se); } |