GFS2: Pagecache usage optimization on GFS2
I introduced "is_partially_uptodate" aops for GFS2. 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. I did a performance test using the sysbench. #sysbench --num-threads=16 --max-requests=200000 --test=fileio --file-num=1 --file-block-size=8K --file-total-size=2G --file-test-mode=rndrw --file-fsync-freq=0 --file-rw-ratio=1 run -2.6.29-rc6 Test execution summary: total time: 202.6389s total number of events: 200000 total time taken by event execution: 2580.0480 per-request statistics: min: 0.0000s avg: 0.0129s max: 49.5852s approx. 95 percentile: 0.0462s -2.6.29-rc6-patched Test execution summary: total time: 177.8639s total number of events: 200000 total time taken by event execution: 2419.0199 per-request statistics: min: 0.0000s avg: 0.0121s max: 52.4306s approx. 95 percentile: 0.0444s arch: ia64 pagesize: 16k blocksize: 4k Signed-off-by: Hisashi Hifumi <hifumi.hisashi@oss.ntt.co.jp> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
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@ -1096,6 +1096,7 @@ static const struct address_space_operations gfs2_writeback_aops = {
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.releasepage = gfs2_releasepage,
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.direct_IO = gfs2_direct_IO,
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.migratepage = buffer_migrate_page,
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.is_partially_uptodate = block_is_partially_uptodate,
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};
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static const struct address_space_operations gfs2_ordered_aops = {
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@ -1111,6 +1112,7 @@ static const struct address_space_operations gfs2_ordered_aops = {
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.releasepage = gfs2_releasepage,
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.direct_IO = gfs2_direct_IO,
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.migratepage = buffer_migrate_page,
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.is_partially_uptodate = block_is_partially_uptodate,
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};
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static const struct address_space_operations gfs2_jdata_aops = {
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@ -1125,6 +1127,7 @@ static const struct address_space_operations gfs2_jdata_aops = {
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.bmap = gfs2_bmap,
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.invalidatepage = gfs2_invalidatepage,
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.releasepage = gfs2_releasepage,
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.is_partially_uptodate = block_is_partially_uptodate,
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};
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void gfs2_set_aops(struct inode *inode)
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