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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 /include/trace
parent40ae3487628235e5f1eb27542cca0cdb6e5dbe16 (diff)
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 'include/trace')
-rw-r--r--include/trace/events/jbd2.h8
1 files changed, 6 insertions, 2 deletions
diff --git a/include/trace/events/jbd2.h b/include/trace/events/jbd2.h
index 127993dbf32..5419f57beb1 100644
--- a/include/trace/events/jbd2.h
+++ b/include/trace/events/jbd2.h
@@ -142,6 +142,7 @@ TRACE_EVENT(jbd2_run_stats,
__field( dev_t, dev )
__field( unsigned long, tid )
__field( unsigned long, wait )
+ __field( unsigned long, request_delay )
__field( unsigned long, running )
__field( unsigned long, locked )
__field( unsigned long, flushing )
@@ -155,6 +156,7 @@ TRACE_EVENT(jbd2_run_stats,
__entry->dev = dev;
__entry->tid = tid;
__entry->wait = stats->rs_wait;
+ __entry->request_delay = stats->rs_request_delay;
__entry->running = stats->rs_running;
__entry->locked = stats->rs_locked;
__entry->flushing = stats->rs_flushing;
@@ -164,10 +166,12 @@ TRACE_EVENT(jbd2_run_stats,
__entry->blocks_logged = stats->rs_blocks_logged;
),
- TP_printk("dev %d,%d tid %lu wait %u running %u locked %u flushing %u "
- "logging %u handle_count %u blocks %u blocks_logged %u",
+ TP_printk("dev %d,%d tid %lu wait %u request_delay %u running %u "
+ "locked %u flushing %u logging %u handle_count %u "
+ "blocks %u blocks_logged %u",
MAJOR(__entry->dev), MINOR(__entry->dev), __entry->tid,
jiffies_to_msecs(__entry->wait),
+ jiffies_to_msecs(__entry->request_delay),
jiffies_to_msecs(__entry->running),
jiffies_to_msecs(__entry->locked),
jiffies_to_msecs(__entry->flushing),