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    SubjectRe: [BUG] fatal hang untarring 90GB file, possibly writeback related.
    On Thu, 2011-04-28 at 08:29 -0400, Chris Mason wrote:
    > Excerpts from Colin Ian King's message of 2011-04-28 07:36:30 -0400:
    > > One more data point to add, I've been looking at an identical issue when
    > > copying large amounts of data. I bisected this - and the lockups occur
    > > with commit
    > > 3e7d344970673c5334cf7b5bb27c8c0942b06126 - before that I don't see the
    > > issue. With this commit, my file copy test locks up after ~8-10
    > > iterations, before this commit I can copy > 100 times and don't see the
    > > lockup.
    > Well, that's really interesting. I tried with compaction on here and
    > couldn't trigger it, but this (very very lightly) tested patch might
    > help.
    > It moves the writeout throttle before the goto restart, and also makes
    > sure we do at least one cond_resched before we loop.

    It seems to take longer, but with a PREEMPT kernel, kswapd eventually
    shoots up to 99% during the tar.


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      Last update: 2011-04-28 16:51    [W:0.027 / U:34.948 seconds]
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