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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" <fvdw@fvdw.eu>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Frans van de Wiel 2010-03-15 19:29:34 +01:00 committed by Jan Kara
parent 70ca0a42fe
commit 8cef107a1d
1 changed files with 6 additions and 0 deletions
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6
fs/ext3/balloc.c
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@ -1583,6 +1583,12 @@ retry_alloc:
if (!gdp)
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