• Linus Torvalds's avatar
    Merge tag 'trace-v4.12' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace · 4c174688
    Linus Torvalds authored
    Pull tracing updates from Steven Rostedt:
     "New features for this release:
    
       - Pretty much a full rewrite of the processing of function plugins.
         i.e. echo do_IRQ:stacktrace > set_ftrace_filter
    
       - The rewrite was needed to add plugins to be unique to tracing
         instances. i.e. mkdir instance/foo; cd instances/foo; echo
         do_IRQ:stacktrace > set_ftrace_filter The old way was written very
         hacky. This removes a lot of those hacks.
    
       - New "function-fork" tracing option. When set, pids in the
         set_ftrace_pid will have their children added when the processes
         with their pids listed in the set_ftrace_pid file forks.
    
       - Exposure of "maxactive" for kretprobe in kprobe_events
    
       - Allow for builtin init functions to be traced by the function
         tracer (via the kernel command line). Module init function tracing
         will come in the next release.
    
       - Added more selftests, and have selftests also test in an instance"
    
    * tag 'trace-v4.12' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: (60 commits)
      ring-buffer: Return reader page back into existing ring buffer
      selftests: ftrace: Allow some event trigger tests to run in an instance
      selftests: ftrace: Have some basic tests run in a tracing instance too
      selftests: ftrace: Have event tests also run in an tracing instance
      selftests: ftrace: Make func_event_triggers and func_traceonoff_triggers tests do instances
      selftests: ftrace: Allow some tests to be run in a tracing instance
      tracing/ftrace: Allow for instances to trigger their own stacktrace probes
      tracing/ftrace: Allow for the traceonoff probe be unique to instances
      tracing/ftrace: Enable snapshot function trigger to work with instances
      tracing/ftrace: Allow instances to have their own function probes
      tracing/ftrace: Add a better way to pass data via the probe functions
      ftrace: Dynamically create the probe ftrace_ops for the trace_array
      tracing: Pass the trace_array into ftrace_probe_ops functions
      tracing: Have the trace_array hold the list of registered func probes
      ftrace: If the hash for a probe fails to update then free what was initialized
      ftrace: Have the function probes call their own function
      ftrace: Have each function probe use its own ftrace_ops
      ftrace: Have unregister_ftrace_function_probe_func() return a value
      ftrace: Add helper function ftrace_hash_move_and_update_ops()
      ftrace: Remove data field from ftrace_func_probe structure
      ...
    4c174688
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