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ad4b78bbcb
Create a new wakeup preemption mode, preempt towards tasks that run
shorter on avg. It sets next buddy to be sure we actually run the task
we preempted for.
Test results:
root@twins:~# while :; do :; done &
[1] 6537
root@twins:~# while :; do :; done &
[2] 6538
root@twins:~# while :; do :; done &
[3] 6539
root@twins:~# while :; do :; done &
[4] 6540
root@twins:/home/peter# ./latt -c4 sleep 4
Entries: 48 (clients=4)
Averages:
------------------------------
Max 4750 usec
Avg 497 usec
Stdev 737 usec
root@twins:/home/peter# echo WAKEUP_RUNNING > /debug/sched_features
root@twins:/home/peter# ./latt -c4 sleep 4
Entries: 48 (clients=4)
Averages:
------------------------------
Max 14 usec
Avg 5 usec
Stdev 3 usec
Disabled by default - needs more testing.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
LKML-Reference: <new-submission>
123 lines
3 KiB
C
123 lines
3 KiB
C
/*
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* Disregards a certain amount of sleep time (sched_latency_ns) and
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* considers the task to be running during that period. This gives it
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* a service deficit on wakeup, allowing it to run sooner.
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*/
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SCHED_FEAT(FAIR_SLEEPERS, 1)
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/*
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* Only give sleepers 50% of their service deficit. This allows
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* them to run sooner, but does not allow tons of sleepers to
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* rip the spread apart.
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*/
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SCHED_FEAT(GENTLE_FAIR_SLEEPERS, 1)
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/*
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* By not normalizing the sleep time, heavy tasks get an effective
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* longer period, and lighter task an effective shorter period they
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* are considered running.
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*/
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SCHED_FEAT(NORMALIZED_SLEEPER, 0)
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/*
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* Place new tasks ahead so that they do not starve already running
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* tasks
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*/
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SCHED_FEAT(START_DEBIT, 1)
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/*
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* Should wakeups try to preempt running tasks.
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*/
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SCHED_FEAT(WAKEUP_PREEMPT, 1)
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/*
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* Compute wakeup_gran based on task behaviour, clipped to
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* [0, sched_wakeup_gran_ns]
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*/
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SCHED_FEAT(ADAPTIVE_GRAN, 1)
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/*
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* When converting the wakeup granularity to virtual time, do it such
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* that heavier tasks preempting a lighter task have an edge.
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*/
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SCHED_FEAT(ASYM_GRAN, 1)
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/*
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* Always wakeup-preempt SYNC wakeups, see SYNC_WAKEUPS.
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*/
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SCHED_FEAT(WAKEUP_SYNC, 0)
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/*
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* Wakeup preempt based on task behaviour. Tasks that do not overlap
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* don't get preempted.
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*/
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SCHED_FEAT(WAKEUP_OVERLAP, 0)
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/*
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* Wakeup preemption towards tasks that run short
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*/
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SCHED_FEAT(WAKEUP_RUNNING, 0)
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/*
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* Use the SYNC wakeup hint, pipes and the likes use this to indicate
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* the remote end is likely to consume the data we just wrote, and
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* therefore has cache benefit from being placed on the same cpu, see
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* also AFFINE_WAKEUPS.
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*/
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SCHED_FEAT(SYNC_WAKEUPS, 1)
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/*
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* Based on load and program behaviour, see if it makes sense to place
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* a newly woken task on the same cpu as the task that woke it --
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* improve cache locality. Typically used with SYNC wakeups as
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* generated by pipes and the like, see also SYNC_WAKEUPS.
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*/
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SCHED_FEAT(AFFINE_WAKEUPS, 1)
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/*
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* Weaken SYNC hint based on overlap
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*/
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SCHED_FEAT(SYNC_LESS, 1)
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/*
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* Add SYNC hint based on overlap
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*/
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SCHED_FEAT(SYNC_MORE, 0)
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/*
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* Prefer to schedule the task we woke last (assuming it failed
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* wakeup-preemption), since its likely going to consume data we
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* touched, increases cache locality.
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*/
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SCHED_FEAT(NEXT_BUDDY, 0)
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/*
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* Prefer to schedule the task that ran last (when we did
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* wake-preempt) as that likely will touch the same data, increases
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* cache locality.
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*/
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SCHED_FEAT(LAST_BUDDY, 1)
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/*
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* Consider buddies to be cache hot, decreases the likelyness of a
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* cache buddy being migrated away, increases cache locality.
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*/
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SCHED_FEAT(CACHE_HOT_BUDDY, 1)
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/*
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* Use arch dependent cpu power functions
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*/
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SCHED_FEAT(ARCH_POWER, 0)
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SCHED_FEAT(HRTICK, 0)
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SCHED_FEAT(DOUBLE_TICK, 0)
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SCHED_FEAT(LB_BIAS, 1)
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SCHED_FEAT(LB_SHARES_UPDATE, 1)
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SCHED_FEAT(ASYM_EFF_LOAD, 1)
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/*
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* Spin-wait on mutex acquisition when the mutex owner is running on
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* another cpu -- assumes that when the owner is running, it will soon
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* release the lock. Decreases scheduling overhead.
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*/
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SCHED_FEAT(OWNER_SPIN, 1)
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