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>

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;