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| author | Jaegeuk Kim <jaegeuk.kim@samsung.com> | 2014-04-02 08:34:36 +0200 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk.kim@samsung.com> | 2014-04-07 02:50:58 +0200 |
| commit | 6b4afdd794783fe515b50838aa36591e3feea990 (patch) | |
| tree | 5f35f32e27db8deaf248cf1e7a4930aab0822a73 /fs/f2fs/acl.c | |
| parent | f2fs: fix to cover io->bio with io_rwsem (diff) | |
| download | linux-6b4afdd794783fe515b50838aa36591e3feea990.tar.xz linux-6b4afdd794783fe515b50838aa36591e3feea990.zip | |
f2fs: introduce f2fs_issue_flush to avoid redundant flush issue
Some storage devices show relatively high latencies to complete cache_flush
commands, even though their normal IO speed is prettry much high. In such
the case, it needs to merge cache_flush commands as much as possible to avoid
issuing them redundantly.
So, this patch introduces a mount option, "-o flush_merge", to mitigate such
the overhead.
If this option is enabled by user, F2FS merges the cache_flush commands and then
issues just one cache_flush on behalf of them. Once the single command is
finished, F2FS sends a completion signal to all the pending threads.
Note that, this option can be used under a workload consisting of very intensive
concurrent fsync calls, while the storage handles cache_flush commands slowly.
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
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