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    Subject[ 065/109] dm thin: reduce endio_hook pool size
    Date
    From: Greg KH <gregkh@linuxfoundation.org>

    3.4-stable review patch. If anyone has any objections, please let me know.

    ------------------

    From: Alasdair G Kergon <agk@redhat.com>

    commit 7768ed33ccdc02801c4483fc5682dc66ace14aea upstream.

    Reduce the slab size used for the dm_thin_endio_hook mempool.

    Allocation has been seen to fail on machines with smaller amounts
    of memory due to fragmentation.

    lvm: page allocation failure. order:5, mode:0xd0
    device-mapper: table: 253:38: thin-pool: Error creating pool's endio_hook mempool

    Signed-off-by: Alasdair G Kergon <agk@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/md/dm-thin.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/drivers/md/dm-thin.c
    +++ b/drivers/md/dm-thin.c
    @@ -19,7 +19,7 @@
    /*
    * Tunable constants
    */
    -#define ENDIO_HOOK_POOL_SIZE 10240
    +#define ENDIO_HOOK_POOL_SIZE 1024
    #define DEFERRED_SET_SIZE 64
    #define MAPPING_POOL_SIZE 1024
    #define PRISON_CELLS 1024



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