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

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Date:	Fri, 18 Jan 2008 19:27:15 +0100
From:	Roberto Fichera <kernel@...no-soft.it>
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

At 18.36 18/01/2008, Arjan van de Ven wrote:
>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.
>
>http://www.latencytop.org
>

[...snip...]

>
>The most basic annotation looks like this (in the patches more complex
>versions can be seen):
>
>  asmlinkage long sys_sync(void)
>  {
>+       struct latency_entry reason;
>+       set_latency_reason("sync system call", &reason);
>         do_sync(1);
>+       restore_latency_reason(&reason);
>+
>         return 0;
>  }
>

I really like this patch :-)! Just a little note, why don't make 
the parameter 'char *reason' as simple integer (reason_t)? 
Making it as integer will automatically drop the strncmp() 
and speeding up all the things. Could be also interesting to 
define _externally_ the mapping of the reason so the 
userspace tool could handle it easily.

Roberto Fichera. 

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