jbd2: track request delay statistics

[linux-block.git] / fs / jbd2 / commit.c

diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index 3091d42992f0d934eb4355022efaa5c83ad1be0d..750c70148effad6151023e70e08a0e17f185d4e8 100644 (file)
--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -435,7 +435,12 @@ void jbd2_journal_commit_transaction(journal_t *journal)
 
        trace_jbd2_commit_locking(journal, commit_transaction);
        stats.run.rs_wait = commit_transaction->t_max_wait;
+       stats.run.rs_request_delay = 0;
        stats.run.rs_locked = jiffies;
+       if (commit_transaction->t_requested)
+               stats.run.rs_request_delay =
+                       jbd2_time_diff(commit_transaction->t_requested,
+                                      stats.run.rs_locked);
        stats.run.rs_running = jbd2_time_diff(commit_transaction->t_start,
                                              stats.run.rs_locked);
 
@@ -1116,7 +1121,10 @@ restart_loop:
         */
        spin_lock(&journal->j_history_lock);
        journal->j_stats.ts_tid++;
+       if (commit_transaction->t_requested)
+               journal->j_stats.ts_requested++;
        journal->j_stats.run.rs_wait += stats.run.rs_wait;
+       journal->j_stats.run.rs_request_delay += stats.run.rs_request_delay;
        journal->j_stats.run.rs_running += stats.run.rs_running;
        journal->j_stats.run.rs_locked += stats.run.rs_locked;
        journal->j_stats.run.rs_flushing += stats.run.rs_flushing;