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    Subject[PATCH 07/32] mm: tag reseve pages
    Tag pages allocated from the reserves with a non-zero page->reserve.
    This allows us to distinguish and account reserve pages.

    Since low-memory situations are transient, and unrelated the the actual
    page (any page can be on the freelist when we run low), don't mark the
    page in any permanent way - just pass along the information to the
    allocatee.

    Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
    ---
    include/linux/mm_types.h | 1 +
    mm/page_alloc.c | 4 +++-
    2 files changed, 4 insertions(+), 1 deletion(-)

    Index: linux-2.6/include/linux/mm_types.h
    ===================================================================
    --- linux-2.6.orig/include/linux/mm_types.h
    +++ linux-2.6/include/linux/mm_types.h
    @@ -70,6 +70,7 @@ struct page {
    union {
    pgoff_t index; /* Our offset within mapping. */
    void *freelist; /* SLUB: freelist req. slab lock */
    + int reserve; /* page_alloc: page is a reserve page */
    };
    struct list_head lru; /* Pageout list, eg. active_list
    * protected by zone->lru_lock !
    Index: linux-2.6/mm/page_alloc.c
    ===================================================================
    --- linux-2.6.orig/mm/page_alloc.c
    +++ linux-2.6/mm/page_alloc.c
    @@ -1433,8 +1433,10 @@ zonelist_scan:
    }

    page = buffered_rmqueue(preferred_zone, zone, order, gfp_mask);
    - if (page)
    + if (page) {
    + page->reserve = !!(alloc_flags & ALLOC_NO_WATERMARKS);
    break;
    + }
    this_zone_full:
    if (NUMA_BUILD)
    zlc_mark_zone_full(zonelist, z);
    --



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