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    Subject[PATCH 1/5] add per-zone statistics to show_free_areas()
    Date
    Subject: [PATCH] add per-zone statistics to show_free_areas()

    Currently, show_free_area() mainly display system memory usage. but it
    doesn't display per-zone memory usage information.

    However, if DMA zone OOM occur, Administrator definitely need to know
    per-zone memory usage information.



    Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
    ---
    mm/page_alloc.c | 20 ++++++++++++++++++++
    1 file changed, 20 insertions(+)

    Index: b/mm/page_alloc.c
    ===================================================================
    --- a/mm/page_alloc.c
    +++ b/mm/page_alloc.c
    @@ -2151,6 +2151,16 @@ void show_free_areas(void)
    " inactive_file:%lukB"
    " unevictable:%lukB"
    " present:%lukB"
    + " mlocked:%lukB"
    + " dirty:%lukB"
    + " writeback:%lukB"
    + " mapped:%lukB"
    + " slab_reclaimable:%lukB"
    + " slab_unreclaimable:%lukB"
    + " pagetables:%lukB"
    + " unstable:%lukB"
    + " bounce:%lukB"
    + " writeback_tmp:%lukB"
    " pages_scanned:%lu"
    " all_unreclaimable? %s"
    "\n",
    @@ -2165,6 +2175,16 @@ void show_free_areas(void)
    K(zone_page_state(zone, NR_INACTIVE_FILE)),
    K(zone_page_state(zone, NR_UNEVICTABLE)),
    K(zone->present_pages),
    + K(zone_page_state(zone, NR_MLOCK)),
    + K(zone_page_state(zone, NR_FILE_DIRTY)),
    + K(zone_page_state(zone, NR_WRITEBACK)),
    + K(zone_page_state(zone, NR_FILE_MAPPED)),
    + K(zone_page_state(zone, NR_SLAB_RECLAIMABLE)),
    + K(zone_page_state(zone, NR_SLAB_UNRECLAIMABLE)),
    + K(zone_page_state(zone, NR_PAGETABLE)),
    + K(zone_page_state(zone, NR_UNSTABLE_NFS)),
    + K(zone_page_state(zone, NR_BOUNCE)),
    + K(zone_page_state(zone, NR_WRITEBACK_TEMP)),
    zone->pages_scanned,
    (zone_is_all_unreclaimable(zone) ? "yes" : "no")
    );



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