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    Subject[patch 12/14] Non-reclaimable page statistics
    From: Lee Schermerhorn <Lee.Schermerhorn@hp.com>

    Report non-reclaimable pages per zone and system wide.

    Note: may want to track/report some specific reasons for
    nonreclaimability for deciding when to splice the noreclaim
    lists back to the normal lru. That will be tricky,
    especially in shrink_active_list(), where we'd need someplace
    to save the per page reason for non-reclaimability until the
    pages are dumped back onto the noreclaim list from the pagevec.

    Note: my tests indicate that NR_NORECLAIM and probably the
    other LRU stats aren't being maintained properly--especially
    with large amounts of mlocked memory and the mlock patch in
    this series installed. Can't be sure of this, as I don't
    know why the pages are on the noreclaim list. Needs further
    investigation.

    Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com>
    Signed-off-by: Rik van Riel <riel@redhat.com>

    ---
    V2 -> V3:
    + rebase to 23-mm1 atop RvR's split LRU series

    V1 -> V2:
    no changes


    drivers/base/node.c | 6 ++++++
    fs/proc/proc_misc.c | 6 ++++++
    mm/page_alloc.c | 16 +++++++++++++++-
    mm/vmstat.c | 3 +++
    4 files changed, 30 insertions(+), 1 deletion(-)

    Index: linux-2.6.26-rc2-mm1/mm/page_alloc.c
    ===================================================================
    --- linux-2.6.26-rc2-mm1.orig/mm/page_alloc.c 2008-05-16 14:05:09.000000000 -0400
    +++ linux-2.6.26-rc2-mm1/mm/page_alloc.c 2008-05-16 14:05:13.000000000 -0400
    @@ -1918,12 +1918,20 @@ void show_free_areas(void)
    }

    printk("Active_anon:%lu active_file:%lu inactive_anon%lu\n"
    - " inactive_file:%lu dirty:%lu writeback:%lu unstable:%lu\n"
    + " inactive_file:%lu"
    +//TODO: check/adjust line lengths
    +#ifdef CONFIG_NORECLAIM_LRU
    + " noreclaim:%lu"
    +#endif
    + " dirty:%lu writeback:%lu unstable:%lu\n"
    " free:%lu slab:%lu mapped:%lu pagetables:%lu bounce:%lu\n",
    global_page_state(NR_ACTIVE_ANON),
    global_page_state(NR_ACTIVE_FILE),
    global_page_state(NR_INACTIVE_ANON),
    global_page_state(NR_INACTIVE_FILE),
    +#ifdef CONFIG_NORECLAIM_LRU
    + global_page_state(NR_NORECLAIM),
    +#endif
    global_page_state(NR_FILE_DIRTY),
    global_page_state(NR_WRITEBACK),
    global_page_state(NR_UNSTABLE_NFS),
    @@ -1950,6 +1958,9 @@ void show_free_areas(void)
    " inactive_anon:%lukB"
    " active_file:%lukB"
    " inactive_file:%lukB"
    +#ifdef CONFIG_NORECLAIM_LRU
    + " noreclaim:%lukB"
    +#endif
    " present:%lukB"
    " pages_scanned:%lu"
    " all_unreclaimable? %s"
    @@ -1963,6 +1974,9 @@ void show_free_areas(void)
    K(zone_page_state(zone, NR_INACTIVE_ANON)),
    K(zone_page_state(zone, NR_ACTIVE_FILE)),
    K(zone_page_state(zone, NR_INACTIVE_FILE)),
    +#ifdef CONFIG_NORECLAIM_LRU
    + K(zone_page_state(zone, NR_NORECLAIM)),
    +#endif
    K(zone->present_pages),
    zone->pages_scanned,
    (zone_is_all_unreclaimable(zone) ? "yes" : "no")
    Index: linux-2.6.26-rc2-mm1/mm/vmstat.c
    ===================================================================
    --- linux-2.6.26-rc2-mm1.orig/mm/vmstat.c 2008-05-16 14:03:56.000000000 -0400
    +++ linux-2.6.26-rc2-mm1/mm/vmstat.c 2008-05-16 14:05:13.000000000 -0400
    @@ -699,6 +699,9 @@ static const char * const vmstat_text[]
    "nr_active_anon",
    "nr_inactive_file",
    "nr_active_file",
    +#ifdef CONFIG_NORECLAIM_LRU
    + "nr_noreclaim",
    +#endif
    "nr_anon_pages",
    "nr_mapped",
    "nr_file_pages",
    Index: linux-2.6.26-rc2-mm1/drivers/base/node.c
    ===================================================================
    --- linux-2.6.26-rc2-mm1.orig/drivers/base/node.c 2008-05-16 13:53:09.000000000 -0400
    +++ linux-2.6.26-rc2-mm1/drivers/base/node.c 2008-05-16 14:05:13.000000000 -0400
    @@ -67,6 +67,9 @@ static ssize_t node_read_meminfo(struct
    "Node %d Inactive(anon): %8lu kB\n"
    "Node %d Active(file): %8lu kB\n"
    "Node %d Inactive(file): %8lu kB\n"
    +#ifdef CONFIG_NORECLAIM_LRU
    + "Node %d Noreclaim: %8lu kB\n"
    +#endif
    #ifdef CONFIG_HIGHMEM
    "Node %d HighTotal: %8lu kB\n"
    "Node %d HighFree: %8lu kB\n"
    @@ -96,6 +99,9 @@ static ssize_t node_read_meminfo(struct
    nid, node_page_state(nid, NR_INACTIVE_ANON),
    nid, node_page_state(nid, NR_ACTIVE_FILE),
    nid, node_page_state(nid, NR_INACTIVE_FILE),
    +#ifdef CONFIG_NORECLAIM_LRU
    + nid, node_page_state(nid, NR_NORECLAIM),
    +#endif
    #ifdef CONFIG_HIGHMEM
    nid, K(i.totalhigh),
    nid, K(i.freehigh),
    Index: linux-2.6.26-rc2-mm1/fs/proc/proc_misc.c
    ===================================================================
    --- linux-2.6.26-rc2-mm1.orig/fs/proc/proc_misc.c 2008-05-16 13:53:09.000000000 -0400
    +++ linux-2.6.26-rc2-mm1/fs/proc/proc_misc.c 2008-05-16 14:05:13.000000000 -0400
    @@ -174,6 +174,9 @@ static int meminfo_read_proc(char *page,
    "Inactive(anon): %8lu kB\n"
    "Active(file): %8lu kB\n"
    "Inactive(file): %8lu kB\n"
    +#ifdef CONFIG_NORECLAIM_LRU
    + "Noreclaim: %8lu kB\n"
    +#endif
    #ifdef CONFIG_HIGHMEM
    "HighTotal: %8lu kB\n"
    "HighFree: %8lu kB\n"
    @@ -209,6 +212,9 @@ static int meminfo_read_proc(char *page,
    K(inactive_anon),
    K(active_file),
    K(inactive_file),
    +#ifdef CONFIG_NORECLAIM_LRU
    + K(global_page_state(NR_NORECLAIM)),
    +#endif
    #ifdef CONFIG_HIGHMEM
    K(i.totalhigh),
    K(i.freehigh),
    --
    All Rights Reversed



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