sched: adaptive scheduler granularity

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Instead of specifying the preemption granularity, specify the wanted
latency. By fixing the granlarity to a constany the wakeup latency
it a function of the number of running tasks on the rq.

Invert this relation.

sysctl_sched_granularity becomes a minimum for the dynamic granularity
computed from the new sysctl_sched_latency.

Then use this latency to do more intelligent granularity decisions: if
there are fewer tasks running then we can schedule coarser. This helps
performance while still always keeping the latency target.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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Peter Zijlstra 2007-08-25 18:41:53 +02:00 • committed by Ingo Molnar

parent 1fc84aaae3

commit 218050855e

4 changed files with 86 additions and 17 deletions

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14

kernel/sched.c

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77

kernel/sched_fair.c

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11

kernel/sysctl.c

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