• Steven Rostedt's avatar
    tracing: add lock depth to entries · 637e7e86
    Steven Rostedt authored
    
    
    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: default avatarSteven Rostedt <rostedt@goodmis.org>
    637e7e86
ftrace_event.h 5.04 KB