On Thu, Nov 11, 2010 at 4:15 AM, Mel Gorman <mel@xxxxxxxxx> 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. -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
