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    SubjectRe: [Bug 8464] New: autoreconf: page allocation failure. order:2, mode:0x84020
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    On (12/05/07 20:58), Nicolas Mailhot didst pronounce:
    > Le samedi 12 mai 2007 à 20:09 +0200, Nicolas Mailhot a écrit :
    > > Le samedi 12 mai 2007 à 17:42 +0100, Mel Gorman a écrit :
    > >
    > > > order-2 (at least 19 pages but more are there) and higher pages were free
    > > > and this was a NORMAL allocation. It should also be above watermarks so
    > > > something screwy is happening
    > > >
    > > > *peers suspiciously*
    > > >
    > > > Can you try the following patch on top of the kswapd patch please? It is
    > > > also available from http://www.csn.ul.ie/~mel/watermarks.patch
    > >
    > > Ok, testing now
    >
    > And this one failed testing too

    And same thing, you have suitable free memory. The last patch was
    wrong because I forgot the !in_interrupt() part which was careless
    and dumb. Please try the following, again on top of the kswapd patch -
    http://www.csn.ul.ie/~mel/watermarks-v2.patch

    Thanks for all the testing, it's appreciated.

    diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.21-mm2-revertmd/mm/page_alloc.c linux-2.6.21-mm2-watermarks/mm/page_alloc.c
    --- linux-2.6.21-mm2-revertmd/mm/page_alloc.c 2007-05-11 21:16:57.000000000 +0100
    +++ linux-2.6.21-mm2-watermarks/mm/page_alloc.c 2007-05-12 20:20:19.000000000 +0100
    @@ -1645,8 +1645,16 @@ nofail_alloc:
    }

    /* Atomic allocations - we can't balance anything */
    - if (!wait)
    + if (!wait) {
    +
    + /* Attempt to allocate ignoring watermarks */
    + page = get_page_from_freelist(gfp_mask, order,
    + zonelist, ALLOC_NO_WATERMARKS);
    + if (page)
    + goto got_pg;
    +
    goto nopage;
    + }

    cond_resched();

    --
    Mel Gorman
    Part-time Phd Student Linux Technology Center
    University of Limerick IBM Dublin Software Lab
    -
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