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

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Date:	11 May 2007 01:31:44 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Maxim Uvarov <muvarov@...mvista.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Performance Stats: Kernel patch

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
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