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    Subject[patch 3/3] balance dirty pages from loop device
    From: Miklos Szeredi <>

    The function do_lo_send_aops() should call
    balance_dirty_pages_ratelimited() after each page similarly to

    Without this, writing the loop device directly (not through a
    filesystem) is very slow, and also slows the whole system down,
    because nr_dirty is constantly over the limit.

    Beware: this patch without the fix to balance_dirty_pages() makes a
    loopback mounted filesystem prone to deadlock.

    Signed-off-by: Miklos Szeredi <>

    Index: linux/drivers/block/loop.c
    --- linux.orig/drivers/block/loop.c 2007-03-24 21:00:40.000000000 +0100
    +++ linux/drivers/block/loop.c 2007-03-24 22:07:06.000000000 +0100
    @@ -275,6 +275,8 @@ static int do_lo_send_aops(struct loop_d
    pos += size;
    + balance_dirty_pages_ratelimited(mapping);
    + cond_resched();
    ret = 0;
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      Last update: 2007-03-24 23:01    [W:0.022 / U:4.444 seconds]
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