tracing: add lock depth to entries

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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>

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This commit is contained in:

Steven Rostedt 2009-09-11 13:55:35 -04:00 • committed by Steven Rostedt

parent 48659d3119

commit 637e7e8641

5 changed files with 31 additions and 10 deletions

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1

include/linux/ftrace_event.h

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9

kernel/trace/trace.c

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5

kernel/trace/trace_events.c

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16

kernel/trace/trace_functions_graph.c

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10

kernel/trace/trace_output.c

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