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f2fs: introduce f2fs_issue_flush to avoid redundant flush issue

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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 <[email protected]>
This commit is contained in:
Jaegeuk Kim 2014-04-02 15:34:36 +09:00
commit 6b4afdd794
5 changed files with 117 additions and 1 deletions
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4
Documentation/filesystems/f2fs.txt
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@ -122,6 +122,10 @@ disable_ext_identify Disable the extension list configured by mkfs, so f2fs
inline_xattr Enable the inline xattrs feature.
inline_data Enable the inline data feature: New created small(<~3.4k)
files can be written into inode block.
flush_merge Merge concurrent cache_flush commands as much as possible
to eliminate redundant command issues. If the underlying
device handles the cache_flush command relatively slowly,
recommend to enable this option.
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