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ext2: Avoid loading bitmaps for full groups during block allocation

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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>
This commit is contained in:
Jan Kara 2010-03-29 13:55:39 +02:00
parent 8cef107a1d
commit 4689153237
1 changed files with 6 additions and 0 deletions
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6
fs/ext2/balloc.c
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@ -1331,6 +1331,12 @@ 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