linux-kernel - Re: Performance Stats: Kernel patch

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Date:	Wed, 11 Apr 2007 16:15:36 +0200
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Maxim Uvarov <muvarov@...mvista.com>
Cc:	linux-kernel@...r.kernel.org, davidsen@....com,
	randy.dunlap@...cle.com, Valdis.Kletnieks@...edu,
	jesper.juhl@...il.com
Subject: Re: Performance Stats: Kernel patch

On Wed, 11 Apr 2007 15:59:16 +0400
Maxim Uvarov <muvarov@...mvista.com> wrote:

> Patch adds Process Performance Statistics.
> It make available to the user the following 
> new per-process (thread) performance statistics:
>    * Involuntary Context Switches
>    * Voluntary Context Switches
>    * Number of system calls
>    
> This data is useful for detecting hyperactivity 
> patterns between processes.

Your description is not very clear about the semantic of your stats.

You currently returns stats only for thread(s) (not process as you claimed)

Please check kernel/sys.c:k_getrusage() to see how getrusage() has to sum *lot* of individual fields to get precise process numbers (even counting stats for dead threads)

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