From 8cef107a1d890ff76c85d665083ff3562be01d32 Mon Sep 17 00:00:00 2001 From: Frans van de Wiel Date: Mon, 15 Mar 2010 19:29:34 +0100 Subject: ext3: Avoid loading bitmaps for full groups during block allocation There is no point in loading bitmap for groups which are completely full. This causes noticeable performance problems (and memory pressure) on small systems with large full filesystem (http://marc.info/?l=linux-ext4&m=126843108314310&w=2). Jan Kara: Added a comment and changed check to use cpu-endian value. Signed-off-by: "Frans van de Wiel" Signed-off-by: Jan Kara --- fs/ext3/balloc.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'fs/ext3') diff --git a/fs/ext3/balloc.c b/fs/ext3/balloc.c index a177122..4a32511 100644 --- a/fs/ext3/balloc.c +++ b/fs/ext3/balloc.c @@ -1584,6 +1584,12 @@ retry_alloc: goto io_error; free_blocks = le16_to_cpu(gdp->bg_free_blocks_count); /* + * skip this group (and avoid loading bitmap) if there + * are no free blocks + */ + if (!free_blocks) + continue; + /* * skip this group if the number of * free blocks is less than half of the reservation * window size. -- cgit v1.1