linux-kernel - [patch 3/3] balance dirty pages from loop device

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Date:	Sat, 24 Mar 2007 22:58:55 +0100
From:	Miklos Szeredi <miklos@...redi.hu>
To:	akpm@...ux-foundation.org
CC:	dgc@....com, linux-kernel@...r.kernel.org
Subject: [patch 3/3] balance dirty pages from loop device

From: Miklos Szeredi <mszeredi@...e.cz>

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

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 <mszeredi@...e.cz>
---

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;
 		unlock_page(page);
 		page_cache_release(page);
+		balance_dirty_pages_ratelimited(mapping);
+		cond_resched();
 	}
 	ret = 0;
 out:
-
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