linux-kernel - Re: [patch] rt: sysprof hrtimer fix

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Message-ID: <20090213124928.GC5483@elte.hu>
Date:	Fri, 13 Feb 2009 13:49:28 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Thomas Gleixner <tglx@...x.de>,
	LKML <linux-kernel@...r.kernel.org>,
	rt-users <linux-rt-users@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Carsten Emde <ce@...g.ch>, Clark Williams <williams@...hat.com>
Subject: Re: [patch] rt: sysprof hrtimer fix


* Frederic Weisbecker <fweisbec@...il.com> wrote:

> So, just a thing.
> -rt make the hrtimer's timers running on softirq context because the hrtimer_interrupt
> doesn't run as a threaded interrupt, and then it is not preemptible right?
> 
> In that case, sysprof will continue to run in hardirq context, as before, and
> it will considerably increase the latency. And that matters here.
> So I think it is important to put it on the reminder:

hm, not sure. Do you know it numerically how much worst-case overhead it
induces?

	Ingo
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