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    Subject[PATCH 3/8] Preserve local node for KSM copies
    Date
    From: Andi Kleen <ak@linux.intel.com>

    Add a alloc_page_vma_node that allows passing the "local" node in.
    Use it in ksm to allocate copy pages on the same node as
    the original as possible.

    Cc: arcange@redhat.com
    Signed-off-by: Andi Kleen <ak@linux.intel.com>
    ---
    include/linux/gfp.h | 2 ++
    mm/ksm.c | 3 ++-
    2 files changed, 4 insertions(+), 1 deletions(-)

    diff --git a/include/linux/gfp.h b/include/linux/gfp.h
    index 782e74a..814d50e 100644
    --- a/include/linux/gfp.h
    +++ b/include/linux/gfp.h
    @@ -343,6 +343,8 @@ extern struct page *alloc_pages_vma(gfp_t gfp_mask, int order,
    #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0)
    #define alloc_page_vma(gfp_mask, vma, addr) \
    alloc_pages_vma(gfp_mask, 0, vma, addr, numa_node_id())
    +#define alloc_page_vma_node(gfp_mask, vma, addr, node) \
    + alloc_pages_vma(gfp_mask, 0, vma, addr, node)

    extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order);
    extern unsigned long get_zeroed_page(gfp_t gfp_mask);
    diff --git a/mm/ksm.c b/mm/ksm.c
    index c2b2a94..fc83335 100644
    --- a/mm/ksm.c
    +++ b/mm/ksm.c
    @@ -1575,7 +1575,8 @@ struct page *ksm_does_need_to_copy(struct page *page,
    {
    struct page *new_page;

    - new_page = alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, address);
    + new_page = alloc_page_vma_node(GFP_HIGHUSER_MOVABLE, vma, address,
    + page_to_nid(page));
    if (new_page) {
    copy_user_highpage(new_page, page, address, vma);

    --
    1.7.4


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