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    SubjectRe: [PATCH 08/28] mm: system wide ALLOC_NO_WATERMARK
    On Wed, 20 Feb 2008 15:46:18 +0100 Peter Zijlstra <a.p.zijlstra@chello.nl> wrote:

    > Change ALLOC_NO_WATERMARK page allocation such that the reserves are system
    > wide - which they are per setup_per_zone_pages_min(), when we scrape the
    > barrel, do it properly.
    >

    The changelog is fairly incomprehensible.

    > mm/page_alloc.c | 6 ++++++
    > 1 file changed, 6 insertions(+)
    >
    > Index: linux-2.6/mm/page_alloc.c
    > ===================================================================
    > --- linux-2.6.orig/mm/page_alloc.c
    > +++ linux-2.6/mm/page_alloc.c
    > @@ -1552,6 +1552,12 @@ restart:
    > rebalance:
    > if (alloc_flags & ALLOC_NO_WATERMARKS) {
    > nofail_alloc:
    > + /*
    > + * break out of mempolicy boundaries
    > + */
    > + zonelist = NODE_DATA(numa_node_id())->node_zonelists +
    > + gfp_zone(gfp_mask);
    > +
    > /* go through the zonelist yet again, ignoring mins */
    > page = get_page_from_freelist(gfp_mask, order, zonelist,
    > ALLOC_NO_WATERMARKS);

    As is the patch. People who care about mempolicies will want a better
    explanation, please, so they can check that we're not busting their stuff.



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