diff options
| author | Paul Turner <pjt@google.com> | 2012-10-04 15:18:31 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2012-10-24 12:27:26 +0400 |
| commit | bb17f65571e97a7ec0297571fb1154fbd107ad00 (patch) | |
| tree | d7574f5a57abe38112cbac832a29354ee1e4fa64 /kernel/sched/debug.c | |
| parent | 8165e145ceb62fc338e099c9b12b3239c83d2f8e (diff) | |
| download | linux-bb17f65571e97a7ec0297571fb1154fbd107ad00.tar.xz | |
sched: Normalize tg load contributions against runnable time
Entities of equal weight should receive equitable distribution of cpu time.
This is challenging in the case of a task_group's shares as execution may be
occurring on multiple cpus simultaneously.
To handle this we divide up the shares into weights proportionate with the load
on each cfs_rq. This does not however, account for the fact that the sum of
the parts may be less than one cpu and so we need to normalize:
load(tg) = min(runnable_avg(tg), 1) * tg->shares
Where runnable_avg is the aggregate time in which the task_group had runnable
children.
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/20120823141506.930124292@google.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched/debug.c')
| -rw-r--r-- | kernel/sched/debug.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c index 290892361a09..71b0ea325e93 100644 --- a/kernel/sched/debug.c +++ b/kernel/sched/debug.c @@ -234,6 +234,10 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) atomic64_read(&cfs_rq->tg->load_avg)); SEQ_printf(m, " .%-30s: %lld\n", "tg_load_contrib", cfs_rq->tg_load_contrib); + SEQ_printf(m, " .%-30s: %d\n", "tg_runnable_contrib", + cfs_rq->tg_runnable_contrib); + SEQ_printf(m, " .%-30s: %d\n", "tg->runnable_avg", + atomic_read(&cfs_rq->tg->runnable_avg)); #endif print_cfs_group_stats(m, cpu, cfs_rq->tg); |