linux-kernel - Re: [PATCH] new irq tracer

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Date:	Fri, 27 Feb 2009 08:25:32 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	Jason Baron <jbaron@...hat.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	"Frank Ch. Eigler" <fche@...hat.com>, mingo@...e.hu,
	rostedt@...dmis.org, linux-kernel@...r.kernel.org,
	acme@...stprotocols.net, fweisbec@...il.com
Subject: Re: [PATCH] new irq tracer

On Fri, 2009-02-27 at 12:33 +0900, KOSAKI Motohiro wrote:
> 
> I agree with IRQ latency tracing is very important.

Then use the irq-latency tracer, that thing is specifically created to
measure and locate irq-off latency sources.

We've been using it for years in the preempt-rt patch-set.

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