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Subject: Re: [patch] voluntary-preempt-2.6.9-rc3-mm3-T3
From: Lee Revell <rlrevell@joe-job.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: linux-kernel <linux-kernel@vger.kernel.org>, "K.R. Foley" <kr@cybsft.com>,
       Rui Nuno Capela <rncbc@rncbc.org>,
       Florian Schmidt <mista.tapas@gmx.net>, Mark_H_Johnson@raytheon.com,
       Fernando Pablo Lopez-Lezcano <nando@ccrma.Stanford.EDU>
In-Reply-To: <20041007105230.GA17411@elte.hu>
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On Thu, 2004-10-07 at 06:52, Ingo Molnar wrote:
> i've released the -T3 VP patch:
> 
>   http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.9-rc3-mm3-T3
> 

Wow, this is a really bad one - 5576 usecs in shmem_truncate!  I think
this was triggered by Mozilla deleting a large video file from /tmp
which is a tmpfs mount.

(mozilla-bin/16141): new 5576 us maximum-latency critical section.
 => started at: <shmem_truncate+0x67/0x630>
 => ended at:   <shmem_truncate+0x3bc/0x630>
 [<c013d96a>] check_preempt_timing+0x14a/0x1e0
 [<c013d2f5>] __mcount+0x15/0x20
 [<c02dd08a>] preempt_schedule+0xa/0x70
 [<c013dbba>] sub_preempt_count+0x5a/0x90
 [<c016b39c>] shmem_truncate+0x3bc/0x630
 [<c016b39c>] shmem_truncate+0x3bc/0x630
 [<c016b964>] shmem_delete_inode+0x134/0x340
 [<c016b830>] shmem_delete_inode+0x0/0x340
 [<c01991ee>] generic_delete_inode+0xde/0x300
 [<c0189615>] sys_unlink+0xf5/0x150
 [<c0106b47>] syscall_call+0x7/0xb

Full trace:

http://krustophenia.net/testresults.php?dataset=2.6.9-rc3-mm3-VP-T3#/var/www/2.6.9-rc3-mm3-VP-T3/shmem-truncate-latency-trace.txt

Lee

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