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    Subject[PATCH 4/6] change alloc function in vmemmap_alloc_block
    Date
    if node_state is N_HIGH_MEMORY, node doesn't have -1.
    It means node's validity check is unnecessary.
    So we can use alloc_pages_exact_node instead of alloc_pages_node.
    It could avoid comparison and branch as 6484eb3e2a81807722 tried.

    Cc: Christoph Lameter <cl@linux-foundation.org>
    Signed-off-by: Minchan Kim <minchan.kim@gmail.com>
    ---
    mm/sparse-vmemmap.c | 2 +-
    1 files changed, 1 insertions(+), 1 deletions(-)

    diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c
    index 392b9bb..7710ebc 100644
    --- a/mm/sparse-vmemmap.c
    +++ b/mm/sparse-vmemmap.c
    @@ -53,7 +53,7 @@ void * __meminit vmemmap_alloc_block(unsigned long size, int node)
    struct page *page;

    if (node_state(node, N_HIGH_MEMORY))
    - page = alloc_pages_node(node,
    + page = alloc_pages_exact_node(node,
    GFP_KERNEL | __GFP_ZERO, get_order(size));
    else
    page = alloc_pages(GFP_KERNEL | __GFP_ZERO,
    --
    1.7.0.5


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