linux-kernel - Re: [Announce] Development release 0.1 of the LatencyTOP tool

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Date:	Sat, 19 Jan 2008 06:07:28 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Arjan van de Ven <arjan@...ux.intel.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [Announce] Development release 0.1 of the LatencyTOP tool

Arjan van de Ven <arjan@...ux.intel.com> writes:

> The Intel Open Source Technology Center is pleased to announce the
> release of version 0.1 of LatencyTOP, a tool for developers to visualize
> system latencies.

Just for completeness -- Linux already had a way to profile latencies
since quite some time. It's little known unfortunately and doesn't
work for modules since it's a special mode in the old non modular kernel
profiler. 

You enable CONFIG_SCHEDSTATS and boot with profile=sleep and then you can
use the readprofile command to read the data. Information can be reset with 
echo > /proc/profile

There's also a profile=sched to profile the scheduler which works even
without CONFIG_SCHEDSTATS

Latencytop will be probably a little more user friendly though.

-Andi
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