Messages in this thread | | | Subject | Re: [PATCH v1] sched: steer waking task to empty cfs_rq for better latencies | From | Peter Zijlstra <> | Date | Tue, 24 Apr 2012 19:09:14 +0200 |
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On Tue, 2012-04-24 at 18:58 +0200, Peter Zijlstra wrote: > On Tue, 2012-04-24 at 22:26 +0530, Srivatsa Vaddagiri wrote: > > Steer a waking task towards a cpu where its cgroup has zero tasks (in > > order to provide it better sleeper credits and hence reduce its wakeup > > latency). > > That's just vile.. pjt could you post your global vruntime stuff so > vatsa can have a go at that?
That is, you're playing a deficiency we should fix, not exploit.
Also, you do a second loop over all those cpus right after we've already iterated them..
furthermore, that 100%+ gain is still way insane, what else is broken? Did you try those paravirt tlb-flush patches and other such weirdness?
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