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    Subject[PATCH 5.4 270/389] dm writecache: set a default MAX_WRITEBACK_JOBS
    Date
    From: Mikulas Patocka <mpatocka@redhat.com>

    commit ca7dc242e358e46d963b32f9d9dd829785a9e957 upstream.

    dm-writecache has the capability to limit the number of writeback jobs
    in progress. However, this feature was off by default. As such there
    were some out-of-memory crashes observed when lowering the low
    watermark while the cache is full.

    This commit enables writeback limit by default. It is set to 256MiB or
    1/16 of total system memory, whichever is smaller.

    Cc: stable@vger.kernel.org
    Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
    Signed-off-by: Mike Snitzer <snitzer@kernel.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/md/dm-writecache.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/drivers/md/dm-writecache.c
    +++ b/drivers/md/dm-writecache.c
    @@ -20,7 +20,7 @@

    #define HIGH_WATERMARK 50
    #define LOW_WATERMARK 45
    -#define MAX_WRITEBACK_JOBS 0
    +#define MAX_WRITEBACK_JOBS min(0x10000000 / PAGE_SIZE, totalram_pages() / 16)
    #define ENDIO_LATENCY 16
    #define WRITEBACK_LATENCY 64
    #define AUTOCOMMIT_BLOCKS_SSD 65536

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