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authorJeff Mahoney <jeffm@suse.com>2006-09-30 23:28:45 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-01 00:39:28 -0700
commit9ea0f9499d15c49df23e7aac4332d830c40e12d0 (patch)
treee6a68575b3aa3a6ee0db0acf1c6469c0308bf0a7 /mm/filemap.c
parent5a2618e6a972f305496daa257a56a09dd3acca29 (diff)
downloadop-kernel-dev-9ea0f9499d15c49df23e7aac4332d830c40e12d0.zip
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[PATCH] reiserfs: eliminate minimum window size for bitmap searching
When a file system becomes fragmented (using MythTV, for example), the bigalloc window searching ends up causing huge performance problems. In a file system presented by a user experiencing this bug, the file system was 90% free, but no 32-block free windows existed on the entire file system. This causes the allocator to scan the entire file system for each 128k write before backing down to searching for individual blocks. In the end, finding a contiguous window for all the blocks in a write is an advantageous special case, but one that can be found naturally when such a window exists anyway. This patch removes the bigalloc window searching, and has been proven to fix the test case described above. Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/filemap.c')
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