linux-kernel - Re: [RFC PATCH 00/11] sched: CFS low-latency features

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Message-ID: <1282894655.1975.1650.camel@laptop>
Date:	Fri, 27 Aug 2010 09:37:35 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Tony Lindgren <tony@...mide.com>,
	Mike Galbraith <efault@....de>
Subject: Re: [RFC PATCH 00/11] sched: CFS low-latency features

On Thu, 2010-08-26 at 19:09 -0400, Mathieu Desnoyers wrote:
> > WTF can't the damned delivery thread not be created when timer_create
> > is called and the signal be delivered to that very thread directly via
> > SIGEV_THREAD_ID ?
> 
> Yeah, that sounds exactly like what I proposed about an hour ago on IRC ;) I'm
> pretty sure that would work.
> 
> The only thing we might have to be careful about is what happens if the timer
> re-fires before the thread completes its execution. We might want to let the
> signal handler detect these overruns somehow.

Simply don't use SIGEV_THREAD and spawn you own thread and use
SIGEV_THREAD_ID yourself, the programmer knows the semantics and knows
if he cares about overlapping timers etc.


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