From: Miklos Szeredi <miklos@szeredi.hu>
To: akpm@linux-foundation.org
Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: [patch 6/8] balance dirty pages from loop device
Date: Tue, 06 Mar 2007 19:04:49 +0100 [thread overview]
Message-ID: <20070306180554.927768351@szeredi.hu> (raw)
In-Reply-To: 20070306180443.669036741@szeredi.hu
[-- Attachment #1: loopback_dirty_fix.patch --]
[-- Type: text/plain, Size: 981 bytes --]
From: Miklos Szeredi <mszeredi@suse.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@suse.cz>
---
Index: linux/drivers/block/loop.c
===================================================================
--- linux.orig/drivers/block/loop.c 2007-02-27 14:40:55.000000000 +0100
+++ linux/drivers/block/loop.c 2007-02-27 14:41:08.000000000 +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:
--
next prev parent reply other threads:[~2007-03-06 18:08 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-06 18:04 [patch 0/8] VFS/VM patches Miklos Szeredi
2007-03-06 18:04 ` [patch 1/8] fix race in clear_page_dirty_for_io() Miklos Szeredi
2007-03-06 22:25 ` Andrew Morton
2007-03-06 18:04 ` [patch 2/8] update ctime and mtime for mmaped write Miklos Szeredi
2007-03-06 20:32 ` Peter Zijlstra
2007-03-06 21:24 ` Miklos Szeredi
2007-03-06 21:47 ` Peter Zijlstra
2007-03-06 22:00 ` Miklos Szeredi
2007-03-06 22:07 ` Peter Zijlstra
2007-03-06 22:18 ` Miklos Szeredi
2007-03-06 22:28 ` Peter Zijlstra
2007-03-06 22:36 ` Miklos Szeredi
2007-03-06 18:04 ` [patch 3/8] per backing_dev dirty and writeback page accounting Miklos Szeredi
2007-03-12 6:23 ` David Chinner
2007-03-12 11:40 ` Miklos Szeredi
2007-03-12 21:44 ` David Chinner
2007-03-12 22:36 ` Miklos Szeredi
2007-03-12 23:12 ` David Chinner
2007-03-13 8:21 ` Miklos Szeredi
2007-03-13 22:12 ` David Chinner
2007-03-14 22:09 ` Miklos Szeredi
2007-03-06 18:04 ` [patch 4/8] fix deadlock in balance_dirty_pages Miklos Szeredi
2007-03-06 18:04 ` [patch 5/8] fix deadlock in throttle_vm_writeout Miklos Szeredi
2007-03-06 18:04 ` Miklos Szeredi [this message]
2007-03-06 18:04 ` [patch 7/8] add filesystem subtype support Miklos Szeredi
2007-03-06 18:04 ` [patch 8/8] consolidate generic_writepages and mpage_writepages fix Miklos Szeredi
2007-03-07 20:46 ` Andrew Morton
2007-03-07 21:26 ` Miklos Szeredi
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