linux-kernel - Re: [PATCH] Performance Stats: Kernel patch

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Message-ID: <4644A01F.4080501@ru.mvista.com>
Date:	Fri, 11 May 2007 16:55:59 +0000
From:	Maxim Uvarov <muvarov@...mvista.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Performance Stats: Kernel patch

Andi Kleen wrote:

>Maxim Uvarov <muvarov@...mvista.com> writes:
>  
>
>>This data is useful for detecting hyperactivity
>>patterns between processes.
>>    
>>
>
>You need a lot better rationale to slow down these important
>fast paths. Particularly the syscall path is very hot.
>
>Is this something that is really generally useful? The context
>switch counters might be occasionally useful, but strace can
>you just give the syscall count anyways. Still not sure 
>it really should go into the standard kernel. Perhaps just keep it 
>as a systemtap script?
>
>-Andi
>  
>
It is difficult to use strace for multi thread applications to
verify which thread is doing what.
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