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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/super.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>
Diffstat (limited to '')
| -rw-r--r-- | fs/f2fs/super.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index 959834066d60..d31b767fde73 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -51,6 +51,7 @@ enum { Opt_disable_ext_identify, Opt_inline_xattr, Opt_inline_data, + Opt_flush_merge, Opt_err, }; @@ -67,6 +68,7 @@ static match_table_t f2fs_tokens = { {Opt_disable_ext_identify, "disable_ext_identify"}, {Opt_inline_xattr, "inline_xattr"}, {Opt_inline_data, "inline_data"}, + {Opt_flush_merge, "flush_merge"}, {Opt_err, NULL}, }; @@ -334,6 +336,9 @@ static int parse_options(struct super_block *sb, char *options) case Opt_inline_data: set_opt(sbi, INLINE_DATA); break; + case Opt_flush_merge: + set_opt(sbi, FLUSH_MERGE); + break; default: f2fs_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" or missing value", @@ -537,6 +542,8 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root) seq_puts(seq, ",disable_ext_identify"); if (test_opt(sbi, INLINE_DATA)) seq_puts(seq, ",inline_data"); + if (test_opt(sbi, FLUSH_MERGE)) + seq_puts(seq, ",flush_merge"); seq_printf(seq, ",active_logs=%u", sbi->active_logs); return 0; |