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229615def3
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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| .. | ||
| acl.c | ||
| acl.h | ||
| bmap.c | ||
| bmap.h | ||
| dir.c | ||
| dir.h | ||
| eaops.c | ||
| eaops.h | ||
| eattr.c | ||
| eattr.h | ||
| gfs2.h | ||
| glock.c | ||
| glock.h | ||
| glops.c | ||
| glops.h | ||
| incore.h | ||
| inode.c | ||
| inode.h | ||
| Kconfig | ||
| lock_dlm.c | ||
| log.c | ||
| log.h | ||
| lops.c | ||
| lops.h | ||
| main.c | ||
| Makefile | ||
| meta_io.c | ||
| meta_io.h | ||
| mount.c | ||
| ops_address.c | ||
| ops_address.h | ||
| ops_dentry.c | ||
| ops_export.c | ||
| ops_file.c | ||
| ops_fstype.c | ||
| ops_inode.c | ||
| ops_super.c | ||
| quota.c | ||
| quota.h | ||
| recovery.c | ||
| recovery.h | ||
| rgrp.c | ||
| rgrp.h | ||
| super.c | ||
| super.h | ||
| sys.c | ||
| sys.h | ||
| trans.c | ||
| trans.h | ||
| util.c | ||
| util.h | ||