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authorSteven Rostedt <srostedt@redhat.com>2009-09-11 13:55:35 -0400
committerSteven Rostedt <rostedt@goodmis.org>2009-09-11 13:55:35 -0400
commit637e7e864103a7a68c1ce43ada27dfc25c0d113f (patch)
tree7ef0eadf41d79b07bc19f62b1355f7c824d781fd /include/linux/ftrace_event.h
parent48659d31195bb76d688e99dabd816c5472fb1656 (diff)
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.h1
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 \