From: Con Kolivas <kernel@kolivas.org>
To: Andrew Morton <akpm@osdl.org>
Cc: devenyga@mcmaster.ca, ck@vds.kolivas.org,
linux-kernel@vger.kernel.org, wli@holomorphy.com
Subject: Re: Preempt Threshold Measurements
Date: Tue, 13 Jul 2004 15:51:59 +1000 [thread overview]
Message-ID: <cone.1089697919.186986.12958.502@pc.kolivas.org> (raw)
In-Reply-To: <20040712210107.1945ac34.akpm@osdl.org>
Andrew Morton writes:
> Con Kolivas <kernel@kolivas.org> wrote:
>> 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.
Ok well excluding do_munmap and exit_mmap the ones that have shown up
(some more frequently than others) are:
6ms at ksoftirqd+0x6b
2ms at sys_ioctl+0x47
2ms at b44_open
6ms at fget+0x28
2ms at write_ordered_buffers+0x37
4ms at blkdev_put+0x48
5ms at add_wait_queue+0x21
4ms at blkdev_put+0x48
and you were right; eventually the reiserfs ones showed up again at 6-8ms
Now which of the above are not false positives and should I try to extract
the exact locations of them?
Con
next prev parent reply other threads:[~2004-07-13 5:52 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-12 23:43 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
2004-07-13 5:51 ` Con Kolivas [this message]
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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