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    Subject[PATCH 05/20] Check only once if the zonelist is suitable for the allocation
    Date
    It is possible with __GFP_THISNODE that no zones are suitable. This
    patch makes sure the check is only made once.

    Signed-off-by: Mel Gorman <mel@csn.ul.ie>
    ---
    mm/page_alloc.c | 6 +++---
    1 files changed, 3 insertions(+), 3 deletions(-)

    diff --git a/mm/page_alloc.c b/mm/page_alloc.c
    index 7cc4932..99fd538 100644
    --- a/mm/page_alloc.c
    +++ b/mm/page_alloc.c
    @@ -1487,9 +1487,8 @@ __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
    if (should_fail_alloc_page(gfp_mask, order))
    return NULL;

    -restart:
    - z = zonelist->_zonerefs; /* the list of zones suitable for gfp_mask */
    -
    + /* the list of zones suitable for gfp_mask */
    + z = zonelist->_zonerefs;
    if (unlikely(!z->zone)) {
    /*
    * Happens if we have an empty zonelist as a result of
    @@ -1498,6 +1497,7 @@ restart:
    return NULL;
    }

    +restart:
    page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, nodemask, order,
    zonelist, high_zoneidx, ALLOC_WMARK_LOW|ALLOC_CPUSET);
    if (page)
    --
    1.5.6.5


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