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SubjectRe: [patch] voluntary-preempt-2.6.9-rc3-mm3-T3
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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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