Re: [PATCH RFC] reduce runqueue lock contention

[Stijn Devriendt]

On Fri, Jun 4, 2010 at 2:00 PM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> On Fri, 2010-06-04 at 12:56 +0200, Stijn Devriendt wrote:
>
>> The issue I want to tackle is waking up processes when others go to sleep.
>> This means try_to_wake_up() from inside the runqueue lock.
>
>
> Tejun did something for that:
>
>  http://lkml.org/lkml/2010/5/13/136
>
>
>

The difference with what I have is that Tejun's threads are guaranteed
to be local
and on the same CPU/runqueue avoiding runqueue deadlocks. My code can be
used to wake up any thread as I basically defer waking up untill after
the runqueue
lock is released.
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