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    SubjectRe: [PATCH] writeback: skip balance_dirty_pages() for in-memory fs
    On 12/17/2010 06:21 AM, Wu Fengguang wrote:
    > This avoids unnecessary checks and dirty throttling on tmpfs/ramfs.
    >
    > It also prevents
    >
    > [ 388.126563] BUG: unable to handle kernel NULL pointer dereference at 0000000000000050
    >
    > in the balance_dirty_pages tracepoint, which will call
    >
    > dev_name(mapping->backing_dev_info->dev)
    >
    > but shmem_backing_dev_info.dev is NULL.
    >
    > CC: Hugh Dickins<hughd@google.com>
    > Signed-off-by: Wu Fengguang<fengguang.wu@intel.com>

    Acked-by: Rik van Riel <riel@redhat.com>

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