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authorJan Kara <jack@suse.cz>2010-03-29 15:55:39 +0400
committerJan Kara <jack@suse.cz>2010-05-21 21:30:37 +0400
commit46891532370e862d6bddedef9e6ca22a59a51fa4 (patch)
tree0e4d6128f7f4a1f67d6c3ede3504100ec5d5ee7a /fs
parent8cef107a1d890ff76c85d665083ff3562be01d32 (diff)
downloadlinux-46891532370e862d6bddedef9e6ca22a59a51fa4.tar.xz
ext2: 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). Port of the same ext3 patch. Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs')
-rw-r--r--fs/ext2/balloc.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/ext2/balloc.c b/fs/ext2/balloc.c
index 3cf038c055d7..e8766a396776 100644
--- a/fs/ext2/balloc.c
+++ b/fs/ext2/balloc.c
@@ -1332,6 +1332,12 @@ retry_alloc:
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.