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authorTheodore Ts'o <tytso@mit.edu>2013-02-06 22:30:23 -0500
committerTheodore Ts'o <tytso@mit.edu>2013-02-06 22:30:23 -0500
commit9fff24aa2c5c504aadead1ff9599e813604c2e53 (patch)
tree24bbb1691ec816aed648a895882526ce361ec92f /fs/jbd2/commit.c
parent40ae3487628235e5f1eb27542cca0cdb6e5dbe16 (diff)
downloadlinux-9fff24aa2c5c504aadead1ff9599e813604c2e53.tar.bz2
jbd2: track request delay statistics
Track the delay between when we first request that the commit begin and when it actually begins, so we can see how much of a gap exists. In theory, this should just be the remaining scheduling quantuum of the thread which requested the commit (assuming it was not a synchronous operation which triggered the commit request) plus scheduling overhead; however, it's possible that real time processes might get in the way of letting the kjournald thread from executing. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/jbd2/commit.c')
-rw-r--r--fs/jbd2/commit.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index 3091d42992f0..750c70148eff 100644
--- 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;