From: Yusuf Goolamabbas <yusufg@outblaze.com>
To: Andi Kleen <ak@muc.de>
Cc: linux-kernel@vger.kernel.org
Subject: Re: finish_task_switch high in profiles in 2.6.7
Date: Thu, 24 Jun 2004 18:44:16 +0800 [thread overview]
Message-ID: <20040624104416.GB8798@outblaze.com> (raw)
In-Reply-To: <m3n02tz203.fsf@averell.firstfloor.org>
> How many context switches do you get in vmstat?
Mentioned in a subsequent message
http://marc.theaimsgroup.com/?l=linux-kernel&m=108806991921498&w=2
> Most likely you just have far too many of them. readprofile will attribute
> most of the cost to finish_task_switch, because that one reenables the
> interrupts (and the profiling only works with interrupts on)
>
> Too many context switches are usually caused by user space.
Hmm, Is there a way to determine which syscall would be the culprit. I
guess this is where something like DTrace would be invaluable
http://www.sun.com/bigadmin/content/dtrace/
next prev parent reply other threads:[~2004-06-24 10:44 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <2ayz2-1Um-15@gated-at.bofh.it>
2004-06-24 10:25 ` finish_task_switch high in profiles in 2.6.7 Andi Kleen
2004-06-24 10:44 ` Yusuf Goolamabbas [this message]
2004-06-24 11:36 ` Andi Kleen
2004-06-24 14:05 ` William Lee Irwin III
2004-06-24 21:22 ` William Lee Irwin III
2004-06-24 21:56 ` William Lee Irwin III
2004-06-25 6:51 ` William Lee Irwin III
2004-06-24 9:15 Yusuf Goolamabbas
2004-06-24 9:27 ` Nick Piggin
2004-06-24 9:34 ` Yusuf Goolamabbas
2004-06-24 9:45 ` Nick Piggin
2004-06-24 10:05 ` Yusuf Goolamabbas
2004-06-24 10:10 ` Nick Piggin
2004-06-24 14:30 ` William Lee Irwin III
2004-06-24 15:33 ` William Lee Irwin III
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