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author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2011-12-19 19:23:15 +0100 |
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committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2011-12-19 19:23:15 +0100 |
commit | 612ef28a045efadb3a98d4492ead7806a146485d (patch) | |
tree | 05621c87b37e91c27b06d450d76adffe97ce9666 /kernel/sched/features.h | |
parent | c3e0ef9a298e028a82ada28101ccd5cf64d209ee (diff) | |
parent | 07cde2608a3b5c66515363f1b53623b1536b9785 (diff) | |
download | linux-612ef28a045efadb3a98d4492ead7806a146485d.tar.gz linux-612ef28a045efadb3a98d4492ead7806a146485d.tar.bz2 linux-612ef28a045efadb3a98d4492ead7806a146485d.zip |
Merge branch 'sched/core' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into cputime-tip
Conflicts:
drivers/cpufreq/cpufreq_conservative.c
drivers/cpufreq/cpufreq_ondemand.c
drivers/macintosh/rack-meter.c
fs/proc/stat.c
fs/proc/uptime.c
kernel/sched/core.c
Diffstat (limited to 'kernel/sched/features.h')
-rw-r--r-- | kernel/sched/features.h | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/kernel/sched/features.h b/kernel/sched/features.h new file mode 100644 index 000000000000..e61fd73913d0 --- /dev/null +++ b/kernel/sched/features.h @@ -0,0 +1,70 @@ +/* + * 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, true) + +/* + * Place new tasks ahead so that they do not starve already running + * tasks + */ +SCHED_FEAT(START_DEBIT, true) + +/* + * Based on load and program behaviour, see if it makes sense to place + * a newly woken task on the same cpu as the task that woke it -- + * improve cache locality. Typically used with SYNC wakeups as + * generated by pipes and the like, see also SYNC_WAKEUPS. + */ +SCHED_FEAT(AFFINE_WAKEUPS, true) + +/* + * Prefer to schedule the task we woke last (assuming it failed + * wakeup-preemption), since its likely going to consume data we + * touched, increases cache locality. + */ +SCHED_FEAT(NEXT_BUDDY, false) + +/* + * Prefer to schedule the task that ran last (when we did + * wake-preempt) as that likely will touch the same data, increases + * cache locality. + */ +SCHED_FEAT(LAST_BUDDY, true) + +/* + * Consider buddies to be cache hot, decreases the likelyness of a + * cache buddy being migrated away, increases cache locality. + */ +SCHED_FEAT(CACHE_HOT_BUDDY, true) + +/* + * Use arch dependent cpu power functions + */ +SCHED_FEAT(ARCH_POWER, false) + +SCHED_FEAT(HRTICK, false) +SCHED_FEAT(DOUBLE_TICK, false) +SCHED_FEAT(LB_BIAS, true) + +/* + * Spin-wait on mutex acquisition when the mutex owner is running on + * another cpu -- assumes that when the owner is running, it will soon + * release the lock. Decreases scheduling overhead. + */ +SCHED_FEAT(OWNER_SPIN, true) + +/* + * Decrement CPU power based on time not spent running tasks + */ +SCHED_FEAT(NONTASK_POWER, true) + +/* + * Queue remote wakeups on the target CPU and process them + * using the scheduler IPI. Reduces rq->lock contention/bounces. + */ +SCHED_FEAT(TTWU_QUEUE, true) + +SCHED_FEAT(FORCE_SD_OVERLAP, false) +SCHED_FEAT(RT_RUNTIME_SHARE, true) |