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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
>

Also, I am still seeing some long latencies in the ext3 journaling code:

preemption latency trace v1.0.7 on 2.6.9-rc3-mm3-VP-T3
-------------------------------------------------------
latency: 607 us, entries: 1087 (1087) | [VP:1 KP:1 SP:1 HP:1 #CPUS:1]
-----------------
| task: kjournald/687, uid:0 nice:0 policy:0 rt_prio:0
-----------------
=> started at: journal_commit_transaction+0x75/0x2830
=> ended at: __journal_clean_checkpoint_list+0xb2/0xf0
=======>
00000001 0.000ms (+0.003ms): journal_commit_transaction (kjournald)

Here is the loop:

00000002 0.003ms (+0.001ms): kfree (journal_commit_transaction)
00000001 0.004ms (+0.001ms): journal_refile_buffer (journal_commit_transaction)
00000003 0.006ms (+0.000ms): __journal_refile_buffer (journal_refile_buffer)
00000003 0.006ms (+0.001ms): __journal_unfile_buffer (journal_refile_buffer)
00000002 0.008ms (+0.000ms): journal_remove_journal_head (journal_refile_buffer)
00000003 0.008ms (+0.000ms): __journal_remove_journal_head (journal_remove_journal_head)
00000003 0.009ms (+0.000ms): __brelse (__journal_remove_journal_head)
00000003 0.010ms (+0.000ms): journal_free_journal_head (journal_remove_journal_head)
00000003 0.010ms (+0.001ms): kmem_cache_free (journal_free_journal_head)
00000001 0.011ms (+0.000ms): __brelse (journal_commit_transaction)

[end loop]

00000002 0.012ms (+0.000ms): kfree (journal_commit_transaction)
00000001 0.013ms (+0.000ms): journal_refile_buffer (journal_commit_transaction)

I think I already reported this one with S7.

Lee

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