linux-kernel - Re: [RFC PATCH 0/4] perf/core: Small event scheduling changes

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Date:	Tue, 10 Nov 2009 10:47:32 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC PATCH 0/4] perf/core: Small event scheduling changes

On Tue, Nov 10, 2009 at 10:41:45AM +0100, Frederic Weisbecker wrote:
> Thanks.
> 
> With this draft, it makes the pinned priority more consistent
> with its purpose but it doesn't yet bring the full pinned over
> flexible priority determinism.
> 
> It does apply the priority in tick time, while we round robin.
> I did that there first so that it covers most of the events
> rescheduling actions and also it doesn't bring much more
> overhead over the previous layout (in theory), it just changes
> the order.
> 
> I'll also try to expand the priority constraint each time we
> sched in a task: when we schedule a new task that belongs to
> a new context, we don't schedule out/in the cpu context but
> that will be needed if we want the full priority determinism.


To lower the overhead at non-tick time, we could even just reschedule
the cpu flexible events. Anyway...



> 
> Anyway, I'll do that progressively.
> 
> 	Frederic.
> 

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