• Linus Torvalds's avatar
    Merge tag 'trace-v4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace · 2600a46e
    Linus Torvalds authored
    Pull tracing updates from Steven Rostedt:
     "This includes two new updates for the ftrace infrastructure.
    
       - With the changing of the code for filtering events by pid, from a
         list of pids to a bitmask, we can now easily implement following
         forks.  With a new tracing option "event-fork" which, when set,
         will have tasks with pids in set_event_pid, when they fork, to have
         their child pids added to set_event_pid and the child will be
         traced as well.
    
         Note, if "event-fork" is set and a task with its pid in
         set_event_pid exits, its pid will be removed from set_event_pid
    
       - The addition of Tom Zanussi's hist triggers.  This includes a very
         thorough documentatino on how to use the hist triggers with events.
         This introduces a quick and easy way to get histogram data from
         events and their fields.
    
      Some other cleanups and updates were added as well.  Like Masami
      Hiramatsu added test cases for the event trigger and hist triggers.
      Also I added a speed up of filtering by using a temp buffer when
      filters are set"
    
    * tag 'trace-v4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: (45 commits)
      tracing: Use temp buffer when filtering events
      tracing: Remove TRACE_EVENT_FL_USE_CALL_FILTER logic
      tracing: Remove unused function trace_current_buffer_lock_reserve()
      tracing: Remove one use of trace_current_buffer_lock_reserve()
      tracing: Have trace_buffer_unlock_commit() call the _regs version with NULL
      tracing: Remove unused function trace_current_buffer_discard_commit()
      tracing: Move trace_buffer_unlock_commit{_regs}() to local header
      tracing: Fold filter_check_discard() into its only user
      tracing: Make filter_check_discard() local
      tracing: Move event_trigger_unlock_commit{_regs}() to local header
      tracing: Don't use the address of the buffer array name in copy_from_user
      tracing: Handle tracing_map_alloc_elts() error path correctly
      tracing: Add check for NULL event field when creating hist field
      tracing: checking for NULL instead of IS_ERR()
      tracing: Do not inherit event-fork option for instances
      tracing: Fix unsigned comparison to zero in hist trigger code
      kselftests/ftrace: Add a test for log2 modifier of hist trigger
      tracing: Add hist trigger 'log2' modifier
      kselftests/ftrace: Add hist trigger testcases
      kselftests/ftrace : Add event trigger testcases
      ...
    2600a46e
ftrace.txt 108 KB