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| author | Hisashi Hifumi <hifumi.hisashi@oss.ntt.co.jp> | 2009-03-05 17:22:21 +0900 |
|---|---|---|
| committer | Mark Fasheh <mfasheh@suse.com> | 2009-04-03 11:39:26 -0700 |
| commit | 1fca3a05ef2823830925dfb66711d6d920265a8d (patch) | |
| tree | 95717db99015caf84c8c90ab94af093b3d75d731 /fs/ocfs2 | |
| parent | 6ca497a83e592d64e050c4d04b6dedb8c915f39a (diff) | |
| download | lwn-1fca3a05ef2823830925dfb66711d6d920265a8d.tar.gz lwn-1fca3a05ef2823830925dfb66711d6d920265a8d.zip | |
ocfs2: Pagecache usage optimization on ocfs2
A page can have multiple buffers and even if a page is not uptodate, some buffers
can be uptodate on pagesize != blocksize environment.
This aops checks that all buffers which correspond to a part of a file
that we want to read are uptodate. If so, we do not have to issue actual
read IO to HDD even if a page is not uptodate because the portion we
want to read are uptodate.
"block_is_partially_uptodate" function is already used by ext2/3/4.
With the following patch random read/write mixed workloads or random read after
random write workloads can be optimized and we can get performance improvement.
Signed-off-by: Hisashi Hifumi <hifumi.hisashi@oss.ntt.co.jp>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
Diffstat (limited to 'fs/ocfs2')
| -rw-r--r-- | fs/ocfs2/aops.c | 23 |
1 files changed, 12 insertions, 11 deletions
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c index 8e1709a679b7..b2c52b3a1484 100644 --- a/fs/ocfs2/aops.c +++ b/fs/ocfs2/aops.c @@ -1956,15 +1956,16 @@ static int ocfs2_write_end(struct file *file, struct address_space *mapping, } const struct address_space_operations ocfs2_aops = { - .readpage = ocfs2_readpage, - .readpages = ocfs2_readpages, - .writepage = ocfs2_writepage, - .write_begin = ocfs2_write_begin, - .write_end = ocfs2_write_end, - .bmap = ocfs2_bmap, - .sync_page = block_sync_page, - .direct_IO = ocfs2_direct_IO, - .invalidatepage = ocfs2_invalidatepage, - .releasepage = ocfs2_releasepage, - .migratepage = buffer_migrate_page, + .readpage = ocfs2_readpage, + .readpages = ocfs2_readpages, + .writepage = ocfs2_writepage, + .write_begin = ocfs2_write_begin, + .write_end = ocfs2_write_end, + .bmap = ocfs2_bmap, + .sync_page = block_sync_page, + .direct_IO = ocfs2_direct_IO, + .invalidatepage = ocfs2_invalidatepage, + .releasepage = ocfs2_releasepage, + .migratepage = buffer_migrate_page, + .is_partially_uptodate = block_is_partially_uptodate, }; |