Messages in this thread | | | Date | Fri, 23 Jul 2004 13:28:42 +0200 | From | Ingo Molnar <> | Subject | [patch] voluntary-preempt-2.6.8-rc2-I4 |
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* Ingo Molnar <mingo@elte.hu> wrote:
> > > http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.8-rc2-I3 > > > > > > it mainly fixes an ext3 livelock that could result in long delays during > > > heavy commit traffic. > > > > Hello Ingo, do you have any measurement of the improvement available ? > > it's a bug in the patch, not really a latency fix. When this (rare) > condition under heavy write traffic occurs then kjournald would loop for > many seconds (or tens of seconds) in __journal_clean_checkpoint_list(), > effectively hanging the system. The system is still preemptible but the > user cannot do much with it. Note that this condition is not present in > the vanilla kernel, it got introduced by earlier versions of > voluntary-preempt.
there's one more new version:
http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.8-rc2-I4
this fixes another rare bug: release_task() could trigger a 'Badness' atomicity message when the right conditions occur on a preemptible kernel. This bugfix also allowed the addition of might_sleep() checks (and hence voluntary-preemption points) to dput() and fput(), two common functions.
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