linux-kernel - Re: Performance Stats: Kernel patch

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Message-ID: <461CFFD7.4010304@tmr.com>
Date:	Wed, 11 Apr 2007 11:33:43 -0400
From:	Bill Davidsen <davidsen@....com>
To:	Eric Dumazet <dada1@...mosbay.com>
CC:	Maxim Uvarov <muvarov@...mvista.com>, linux-kernel@...r.kernel.org,
	randy.dunlap@...cle.com, Valdis.Kletnieks@...edu,
	jesper.juhl@...il.com
Subject: Re: Performance Stats: Kernel patch

Eric Dumazet wrote:
> 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)
>   
I'm not sure if you were confused by his use of thread in parenthesis, 
but isn't the whole point of this to see which threads are doing what? 
Or am I misreading his result as intentional?
> 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)
>
>   
-- 
bill davidsen <davidsen@....com>
  CTO TMR Associates, Inc
  Doing interesting things with small computers since 1979

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