Messages in this thread | | | Date | Thu, 11 Nov 2010 04:25:00 -0800 | Subject | Re: [BUG] Commit d065bd81 severely regresses huge page allocation success rates | From | Michel Lespinasse <> |
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On Thu, Nov 11, 2010 at 4:15 AM, Mel Gorman <mel@csn.ul.ie> wrote: > When testing 2.6.37-rc1, I noticed that huge page allocation success > rates were severely impaired. Bisection showed that commit [d065bd81: mm: > retry page fault when blocking on disk transfer] was the biggest factor. > Reverting the patch confirmed this. Here are the results of a high-order > allocation stress test. The vanilla kernel is 2.6.37-rc1 and the revert > kernel has this commit removed with minor conflicts cleaned up. [...] > I have not digested what the patch is doing but am reporting it in case > people familiar with the patch spot the problem quickly.
There was a bug in that commit, which was fixed in d88c0922fa0e2c021a028b310a641126c6d4b7dc
I think this may explain the issue; compaction won't work well if extra references are kept :/
Can you check that this indeed solves your test case ?
-- Michel "Walken" Lespinasse A program is never fully debugged until the last user dies.
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