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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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