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| author | Steven Rostedt <srostedt@redhat.com> | 2009-09-11 13:55:35 -0400 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2009-09-11 13:55:35 -0400 |
| commit | 637e7e864103a7a68c1ce43ada27dfc25c0d113f (patch) | |
| tree | 7ef0eadf41d79b07bc19f62b1355f7c824d781fd /include/linux/ftrace_event.h | |
| parent | 48659d31195bb76d688e99dabd816c5472fb1656 (diff) | |
| download | lwn-637e7e864103a7a68c1ce43ada27dfc25c0d113f.tar.gz lwn-637e7e864103a7a68c1ce43ada27dfc25c0d113f.zip | |
tracing: add lock depth to entries
This patch adds the lock depth of the big kernel lock to the generic
entry header. This way we can see the depth of the lock and help
in removing the BKL.
Example:
# _------=> CPU#
# / _-----=> irqs-off
# | / _----=> need-resched
# || / _---=> hardirq/softirq
# ||| / _--=> preempt-depth
# |||| /_--=> lock-depth
# |||||/ delay
# cmd pid |||||| time | caller
# \ / |||||| \ | /
<idle>-0 2.N..3 5902255250us+: lock_acquire: read rcu_read_lock
<idle>-0 2.N..3 5902255253us+: lock_release: rcu_read_lock
<idle>-0 2dN..3 5902255257us+: lock_acquire: xtime_lock
<idle>-0 2dN..4 5902255259us : lock_acquire: clocksource_lock
<idle>-0 2dN..4 5902255261us+: lock_release: clocksource_lock
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'include/linux/ftrace_event.h')
| -rw-r--r-- | include/linux/ftrace_event.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h index 06c795b536c2..0608b0ff2635 100644 --- a/include/linux/ftrace_event.h +++ b/include/linux/ftrace_event.h @@ -34,6 +34,7 @@ struct trace_entry { unsigned char flags; unsigned char preempt_count; int pid; + int lock_depth; }; #define FTRACE_MAX_EVENT \ |