xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

jbd2: track request delay statistics

Browse Source 
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>
This commit is contained in:
Theodore Ts'o
2013-02-06 22:30:23 -05:00
parent 40ae348762
commit 9fff24aa2c
5 changed files with 31 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
include/trace/events/jbd2.h
View File

@@ -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),