Commit-ID: 51e0304ce6e55a6e59658558916b4f74da085ff0 Gitweb: http://git.kernel.org/tip/51e0304ce6e55a6e59658558916b4f74da085ff0 Author: Ingo Molnar <mingo@xxxxxxx> AuthorDate: Wed, 16 Sep 2009 08:54:45 +0200 Committer: Ingo Molnar <mingo@xxxxxxx> CommitDate: Wed, 16 Sep 2009 09:05:20 +0200 sched: Implement a gentler fair-sleepers feature Add back FAIR_SLEEPERS and GENTLE_FAIR_SLEEPERS. FAIR_SLEEPERS is the old logic: credit sleepers with their sleep time. GENTLE_FAIR_SLEEPERS dampens this a bit: 50% of their sleep time gets credited. The hope here is to still give the benefits of fair-sleepers logic (quick wakeups, etc.) while not allow them to have 100% of their sleep time as if they were running. Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> Cc: Mike Galbraith <efault@xxxxxx> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@xxxxxxx> --- kernel/sched_fair.c | 9 ++++++++- kernel/sched_features.h | 9 ++++++++- 2 files changed, 16 insertions(+), 2 deletions(-) diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index a37f311..acf16a8 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -711,7 +711,7 @@ place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int initial) if (!initial) { /* sleeps upto a single latency don't count. */ - if (sched_feat(NEW_FAIR_SLEEPERS)) { + if (sched_feat(FAIR_SLEEPERS)) { unsigned long thresh = sysctl_sched_latency; /* @@ -725,6 +725,13 @@ place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int initial) task_of(se)->policy != SCHED_IDLE)) thresh = calc_delta_fair(thresh, se); + /* + * Halve their sleep time's effect, to allow + * for a gentler effect of sleepers: + */ + if (sched_feat(GENTLE_FAIR_SLEEPERS)) + thresh >>= 1; + vruntime -= thresh; } } diff --git a/kernel/sched_features.h b/kernel/sched_features.h index 70115c6..fd37567 100644 --- a/kernel/sched_features.h +++ b/kernel/sched_features.h @@ -3,7 +3,14 @@ * considers the task to be running during that period. This gives it * a service deficit on wakeup, allowing it to run sooner. */ -SCHED_FEAT(NEW_FAIR_SLEEPERS, 0) +SCHED_FEAT(FAIR_SLEEPERS, 1) + +/* + * Only give sleepers 50% of their service deficit. This allows + * them to run sooner, but does not allow tons of sleepers to + * rip the spread apart. + */ +SCHED_FEAT(GENTLE_FAIR_SLEEPERS, 1) /* * By not normalizing the sleep time, heavy tasks get an effective -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html