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    SubjectRe: page allocator regression on nommu
    On Tue, Sep 01, 2009 at 09:46:27AM +0900, Paul Mundt wrote:
    > > What is the output of the following debug patch?
    > >
    >
    > ...
    > Inode-cache hash table entries: 1024 (order: 0, 4096 bytes)
    > ------------[ cut here ]------------
    > Badness at mm/page_alloc.c:1046
    >

    Ok, it looks like ownership was not being taken properly and the first
    patch was incomplete. Please try

    ====

    diff --git a/mm/page_alloc.c b/mm/page_alloc.c
    index d052abb..5596880 100644
    --- a/mm/page_alloc.c
    +++ b/mm/page_alloc.c
    @@ -817,13 +815,15 @@ __rmqueue_fallback(struct zone *zone, int order, int start_migratetype)
    * agressive about taking ownership of free pages
    */
    if (unlikely(current_order >= (pageblock_order >> 1)) ||
    - start_migratetype == MIGRATE_RECLAIMABLE) {
    + start_migratetype == MIGRATE_RECLAIMABLE ||
    + page_group_by_mobility_disabled) {
    unsigned long pages;
    pages = move_freepages_block(zone, page,
    start_migratetype);

    /* Claim the whole block if over half of it is free */
    - if (pages >= (1 << (pageblock_order-1)))
    + if (pages >= (1 << (pageblock_order-1)) ||
    + page_group_by_mobility_disabled)
    set_pageblock_migratetype(page,
    start_migratetype);


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