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    Subject[PATCH 3/8] mm: remove MPOL_MF_STATS
    Date
    Mapping statistics in a NUMA environment is now computed using the
    generic walk_page_range() logic. Remove the old/equivalent
    functionality.

    Signed-off-by: Stephen Wilson <wilsons@start.ca>
    ---
    mm/mempolicy.c | 10 ++++++----
    1 files changed, 6 insertions(+), 4 deletions(-)

    diff --git a/mm/mempolicy.c b/mm/mempolicy.c
    index dfe27e3..63c0d69 100644
    --- a/mm/mempolicy.c
    +++ b/mm/mempolicy.c
    @@ -99,7 +99,6 @@
    /* Internal flags */
    #define MPOL_MF_DISCONTIG_OK (MPOL_MF_INTERNAL << 0) /* Skip checks for continuous vmas */
    #define MPOL_MF_INVERT (MPOL_MF_INTERNAL << 1) /* Invert check for nodemask */
    -#define MPOL_MF_STATS (MPOL_MF_INTERNAL << 2) /* Gather statistics */

    static struct kmem_cache *policy_cache;
    static struct kmem_cache *sn_cache;
    @@ -492,9 +491,7 @@ static int check_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
    if (node_isset(nid, *nodes) == !!(flags & MPOL_MF_INVERT))
    continue;

    - if (flags & MPOL_MF_STATS)
    - gather_stats(page, private, pte_dirty(*pte));
    - else if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL))
    + if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL))
    migrate_page_add(page, private, flags);
    else
    break;
    @@ -2572,6 +2569,7 @@ static int gather_pte_stats(pte_t *pte, unsigned long addr,
    unsigned long pte_size, struct mm_walk *walk)
    {
    struct page *page;
    + int nid;

    if (pte_none(*pte))
    return 0;
    @@ -2580,6 +2578,10 @@ static int gather_pte_stats(pte_t *pte, unsigned long addr,
    if (!page)
    return 0;

    + nid = page_to_nid(page);
    + if (!node_isset(nid, node_states[N_HIGH_MEMORY]))
    + return 0;
    +
    gather_stats(page, walk->private, pte_dirty(*pte));
    return 0;
    }
    --
    1.7.3.5


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