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    SubjectRe: Out of Memory: Killed process 16498 (java).
    On Thu, Jan 19, 2006 at 03:11:45PM -0000, Andy Chittenden wrote:
    > DMA free:20kB min:24kB low:28kB high:36kB active:0kB inactive:0kB
    > present:12740kB pages_scanned:4 all_unreclaimable? yes

    Note we only scanned 4 pages before we gave up.
    Larry Woodman came up with this patch below that clears all_unreclaimable
    when in two places where we've made progress at freeing up some pages
    which has helped oom situations for some of our users.

    From: Larry Woodman <lwoodman@redhat.com>
    Signed-off-by: Dave Jones <davej@redhat.com>

    --- linux-2.6/mm/filemap.c~ 2005-12-10 01:47:15.000000000 -0500
    +++ linux-2.6/mm/filemap.c 2005-12-10 01:47:46.000000000 -0500
    @@ -471,11 +471,18 @@ EXPORT_SYMBOL(unlock_page);
    */
    void end_page_writeback(struct page *page)
    {
    + struct zone *zone = page_zone(page);
    if (!TestClearPageReclaim(page) || rotate_reclaimable_page(page)) {
    if (!test_clear_page_writeback(page))
    BUG();
    }
    smp_mb__after_clear_bit();
    + if (zone->all_unreclaimable) {
    + spin_lock(&zone->lock);
    + zone->all_unreclaimable = 0;
    + zone->pages_scanned = 0;
    + spin_unlock(&zone->lock);
    + }
    wake_up_page(page, PG_writeback);
    }
    EXPORT_SYMBOL(end_page_writeback);
    --- linux-2.6.15/mm/page_alloc.c~ 2006-01-09 13:40:03.000000000 -0500
    +++ linux-2.6.15/mm/page_alloc.c 2006-01-09 13:40:50.000000000 -0500
    @@ -722,6 +722,11 @@ static void fastcall free_hot_cold_page(
    if (pcp->count >= pcp->high) {
    free_pages_bulk(zone, pcp->batch, &pcp->list, 0);
    pcp->count -= pcp->batch;
    + } else if (zone->all_unreclaimable) {
    + spin_lock(&zone->lock);
    + zone->all_unreclaimable = 0;
    + zone->pages_scanned = 0;
    + spin_unlock(&zone->lock);
    }
    local_irq_restore(flags);
    put_cpu();
    -
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