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From: Andrew Morton <akpm@osdl.org>
To: Con Kolivas <kernel@kolivas.org>
Cc: devenyga@mcmaster.ca, ck@vds.kolivas.org,
	linux-kernel@vger.kernel.org, wli@holomorphy.com
Subject: Re: Preempt Threshold Measurements
Date: Mon, 12 Jul 2004 21:01:07 -0700	[thread overview]
Message-ID: <20040712210107.1945ac34.akpm@osdl.org> (raw)
In-Reply-To: <cone.1089687290.911943.12958.502@pc.kolivas.org>

Con Kolivas <kernel@kolivas.org> wrote:
>
> Gabriel Devenyi writes:
> 
> > Well I'm not particularly educated in kernel internals yet, here's some 
> > reports from the system when its running.
> > 
> > 6ms non-preemptible critical section violated 4 ms preempt threshold starting 
> > at do_munmap+0xd2/0x140 and ending at do_munmap+0xeb/0x140
> 
> Certainly the do_munmap and exit_mmap seem to be repeat offenders on my 
> machine too (more the latter in my case).
> 

This is a false positive.  Nothing is setting need_resched(), so
unmap_vmas() doesn't bother dropping the lock.


  reply	other threads:[~2004-07-13  4:02 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-07-12 23:43 Preempt Threshold Measurements Gabriel Devenyi
2004-07-12 23:59 ` Con Kolivas
2004-07-13  0:15   ` Gabriel Devenyi
2004-07-13  2:40 ` William Lee Irwin III
2004-07-13  2:48   ` [ck] " Gabriel Devenyi
2004-07-13  2:54     ` Con Kolivas
2004-07-13  4:01       ` Andrew Morton [this message]
2004-07-13  5:51         ` Con Kolivas
2004-07-13  6:14           ` Andrew Morton
2004-07-13  8:03             ` Lee Revell
2004-07-13 10:26             ` Con Kolivas
2004-07-13 21:52             ` Con Kolivas
2004-07-13 10:08         ` William Lee Irwin III
2004-07-13 10:40           ` William Lee Irwin III
2004-07-13 11:07             ` Lenar Lõhmus
2004-07-13 11:13               ` William Lee Irwin III
2004-07-13  2:55     ` [ck] " William Lee Irwin III
2004-07-13  3:09       ` Gabriel Devenyi
2004-07-13  4:07       ` Andrew Morton
2004-07-13  5:34         ` Con Kolivas
2004-07-13  5:48           ` Nick Piggin
2004-07-13 10:14             ` William Lee Irwin III
2004-07-14 10:15 ` [ck] " Jens Bergmann

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