From: William Lee Irwin III <wli@holomorphy.com>
To: Andi Kleen <ak@muc.de>
Cc: Yusuf Goolamabbas <yusufg@outblaze.com>, linux-kernel@vger.kernel.org
Subject: Re: finish_task_switch high in profiles in 2.6.7
Date: Thu, 24 Jun 2004 07:05:39 -0700 [thread overview]
Message-ID: <20040624140539.GT1552@holomorphy.com> (raw)
In-Reply-To: <20040624113608.GA31080@colin2.muc.de>
On Thu, Jun 24, 2004 at 01:36:08PM +0200, Andi Kleen wrote:
> Sounds like a inferior clone of dprobes to me. But I doubt it
> would help tracking this down.
The schedprof thing I wrote to track down the source of context
switches during database creation may prove useful, since it has
at least demonstrated where thundering herds came from properly once
before and is damn near idiotproof -- it requires no more than
readprofile(1) from userspace. I'll dredge that up again and maybe
we'll see if it helps here. It will also properly point to
sys_sched_yield() and the like in the event of badly-behaved userspace.
-- wli
next prev parent reply other threads:[~2004-06-24 14:06 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
2004-06-24 11:36 ` Andi Kleen
2004-06-24 14:05 ` William Lee Irwin III [this message]
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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