Re: [patch] voluntary-preempt-2.6.9-rc2-mm4-S7

[Lee Revell]

On Mon, 2004-09-27 at 20:05, Ingo Molnar wrote:
> i've released the -S7 VP patch:
> 
>   http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.9-rc2-mm4-S7
> 

OK, I have been busy with other things, so haven't been able to test as
much.  There might be a few regressions with S7.  Here is a trace from
the ext3 journaling code that I never saw before.  It starts with some
printks from the rtc_interrupt, due to having the rtc-debug patch
installed, but these accout for less than 100 usecs of the ~600 usec
latency.

http://krustophenia.net/testresults.php?dataset=2.6.9-rc2-mm4-S7

This part repeats many times:

00000001 0.127ms (+0.000ms): journal_refile_buffer (journal_commit_transaction)
00000003 0.127ms (+0.000ms): __journal_refile_buffer (journal_refile_buffer)
00000003 0.128ms (+0.000ms): __journal_unfile_buffer (journal_refile_buffer)
00000002 0.128ms (+0.000ms): preempt_schedule (journal_refile_buffer)
00000002 0.128ms (+0.000ms): journal_remove_journal_head (journal_refile_buffer)
00000003 0.129ms (+0.000ms): __journal_remove_journal_head (journal_remove_journal_head)
00000003 0.129ms (+0.000ms): __brelse (__journal_remove_journal_head)
00000003 0.130ms (+0.000ms): journal_free_journal_head (journal_remove_journal_head)
00000003 0.130ms (+0.000ms): kmem_cache_free (journal_free_journal_head)
00000002 0.130ms (+0.000ms): preempt_schedule (journal_refile_buffer)
00000001 0.131ms (+0.000ms): preempt_schedule (journal_refile_buffer)
00000001 0.131ms (+0.000ms): __brelse (journal_commit_transaction)
00000002 0.132ms (+0.000ms): kfree (journal_commit_transaction)
00000001 0.132ms (+0.000ms): preempt_schedule (journal_commit_transaction)
00000001 0.133ms (+0.000ms): journal_refile_buffer (journal_commit_transaction)
00000003 0.133ms (+0.000ms): __journal_refile_buffer (journal_refile_buffer)
00000003 0.133ms (+0.000ms): __journal_unfile_buffer (journal_refile_buffer)
00000002 0.134ms (+0.000ms): preempt_schedule (journal_refile_buffer)
00000002 0.134ms (+0.000ms): journal_remove_journal_head (journal_refile_buffer)
00000003 0.135ms (+0.000ms): __journal_remove_journal_head (journal_remove_journal_head)
00000003 0.135ms (+0.000ms): __brelse (__journal_remove_journal_head)
00000003 0.135ms (+0.000ms): journal_free_journal_head (journal_remove_journal_head)
00000003 0.136ms (+0.000ms): kmem_cache_free (journal_free_journal_head)
00000002 0.136ms (+0.000ms): preempt_schedule (journal_refile_buffer)
00000001 0.136ms (+0.000ms): preempt_schedule (journal_refile_buffer)
00000001 0.137ms (+0.000ms): __brelse (journal_commit_transaction)
00000002 0.137ms (+0.000ms): kfree (journal_commit_transaction)
00000001 0.138ms (+0.000ms): preempt_schedule (journal_commit_transaction)
00000001 0.138ms (+0.000ms): journal_refile_buffer (journal_commit_transaction)
00000003 0.139ms (+0.000ms): __journal_refile_buffer (journal_refile_buffer)
00000003 0.139ms (+0.000ms): __journal_unfile_buffer (journal_refile_buffer)
00000002 0.140ms (+0.000ms): preempt_schedule (journal_refile_buffer)
00000002 0.140ms (+0.000ms): journal_remove_journal_head (journal_refile_buffer)
00000003 0.141ms (+0.000ms): __journal_remove_journal_head (journal_remove_journal_head)
00000003 0.141ms (+0.000ms): __brelse (__journal_remove_journal_head)
00000003 0.141ms (+0.000ms): journal_free_journal_head (journal_remove_journal_head)
00000003 0.142ms (+0.000ms): kmem_cache_free (journal_free_journal_head)
00000002 0.142ms (+0.000ms): preempt_schedule (journal_refile_buffer)
00000001 0.142ms (+0.000ms): preempt_schedule (journal_refile_buffer)
00000001 0.143ms (+0.001ms): __brelse (journal_commit_transaction)
00000002 0.144ms (+0.000ms): kfree (journal_commit_transaction)


Lee

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