[GIT PULL] tracing: Updates for 5.7

[Steven Rostedt]

Linus,

New tracing features:

 - The ring buffer is no longer disabled when reading the trace file.
   The trace_pipe file was made to be used for live tracing and reading
   as it acted like the normal producer/consumer. As the trace file
   would not consume the data, the easy way of handling it was to just
   disable writes to the ring buffer. This came to a surprise to the
   BPF folks who complained about lost events due to reading.
   This is no longer an issue. If someone wants to keep the old disabling
   there's a new option "pause-on-trace" that can be set.

 - New set_ftrace_notrace_pid file. PIDs in this file will not be traced
   by the function tracer. Similar to set_ftrace_pid, which makes the
   function tracer only trace those tasks with PIDs in the file, the
   set_ftrace_notrace_pid does the reverse.

 - New set_event_notrace_pid file. PIDs in this file will cause events
   not to be traced if triggered by a task with a matching PID.
   Similar to the set_event_pid file but will not be traced.
   Note, sched_waking and sched_switch events may still be trace if
   one of the tasks referenced by those events contains a PID that
   is allowed to be traced.

Tracing related features:

 - New bootconfig option, that is attached to the initrd file.
   If bootconfig is on the command line, then the initrd file
   is searched looking for a bootconfig appended at the end.

 - New GPU tracepoint infrastructure to help the gfx drivers to get
   off debugfs (acked by Greg Kroah-Hartman)

Other minor updates and fixes.


Please pull the latest trace-v5.7 tree, which can be found at:


  git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
trace-v5.7

Tag SHA1: 7c483089c1d670b55a9b2d574a74b6c0f6481544
Head SHA1: 8e99cf91b99bb30e16727f10ad6828741c0e992f


Masami Hiramatsu (3):
      bootconfig: Support O=<builddir> option
      tools/bootconfig: Show line and column in parse error
      ftrace/kprobe: Show the maxactive number on kprobe_events

Nathan Chancellor (1):
      tracing: Use address-of operator on section symbols

Steven Rostedt (VMware) (22):
      tracing: Have hwlat ts be first instance and record count of instances
      tracing: Remove unused TRACE_BUFFER bits
      selftest/ftrace: Fix function trigger test to handle trace not disabling the tracer
      tracing: Save off entry when peeking at next entry
      ring-buffer: Have ring_buffer_empty() not depend on tracing stopped
      ring-buffer: Rename ring_buffer_read() to read_buffer_iter_advance()
      ring-buffer: Add page_stamp to iterator for synchronization
      ring-buffer: Have rb_iter_head_event() handle concurrent writer
      ring-buffer: Do not die if rb_iter_peek() fails more than thrice
      ring-buffer: Optimize rb_iter_head_event()
      ring-buffer: Make resize disable per cpu buffer instead of total buffer
      ring-buffer: Do not disable recording when there is an iterator
      tracing: Do not disable tracing when reading the trace file
      ring-buffer/tracing: Have iterator acknowledge dropped events
      tracing: Have the document reflect that the trace file keeps tracing enabled
      ftrace: Make function trace pid filtering a bit more exact
      ftrace: Create set_ftrace_notrace_pid to not trace tasks
      tracing: Create set_event_notrace_pid to not trace tasks
      selftests/ftrace: Add test to test new set_ftrace_notrace_pid file
      selftests/ftrace: Add test to test new set_event_notrace_pid file
      tracing: Add documentation on set_ftrace_notrace_pid and set_event_notrace_pid
      tracing: Do not allocate buffer in trace_find_next_entry() in atomic

Yiwei Zhang (1):
      gpu/trace: add a gpu total memory usage tracepoint

----
 Documentation/trace/ftrace.rst                     |  82 ++++--
 drivers/Kconfig                                    |   2 +
 drivers/gpu/Makefile                               |   1 +
 drivers/gpu/trace/Kconfig                          |   4 +
 drivers/gpu/trace/Makefile                         |   3 +
 drivers/gpu/trace/trace_gpu_mem.c                  |  13 +
 include/linux/bootconfig.h                         |   3 +-
 include/linux/ring_buffer.h                        |   4 +-
 include/linux/trace_events.h                       |   2 +
 include/trace/events/gpu_mem.h                     |  57 +++++
 init/main.c                                        |  14 +-
 kernel/trace/ftrace.c                              | 200 +++++++++++++--
 kernel/trace/ring_buffer.c                         | 239 ++++++++++++------
 kernel/trace/trace.c                               | 110 ++++++--
 kernel/trace/trace.h                               |  39 ++-
 kernel/trace/trace_entries.h                       |   4 +-
 kernel/trace/trace_events.c                        | 280 ++++++++++++++++-----
 kernel/trace/trace_functions_graph.c               |   2 +-
 kernel/trace/trace_hwlat.c                         |  24 +-
 kernel/trace/trace_kprobe.c                        |   2 +
 kernel/trace/trace_output.c                        |  19 +-
 lib/bootconfig.c                                   |  35 ++-
 tools/bootconfig/Makefile                          |  27 +-
 tools/bootconfig/main.c                            |  35 ++-
 tools/bootconfig/test-bootconfig.sh                |  14 +-
 .../selftests/ftrace/test.d/event/event-no-pid.tc  | 125 +++++++++
 .../test.d/ftrace/func-filter-notrace-pid.tc       | 108 ++++++++
 .../test.d/ftrace/func_traceonoff_triggers.tc      |   2 +-
 28 files changed, 1194 insertions(+), 256 deletions(-)
 create mode 100644 drivers/gpu/trace/Kconfig
 create mode 100644 drivers/gpu/trace/Makefile
 create mode 100644 drivers/gpu/trace/trace_gpu_mem.c
 create mode 100644 include/trace/events/gpu_mem.h
 create mode 100644 tools/testing/selftests/ftrace/test.d/event/event-no-pid.tc
 create mode 100644 tools/testing/selftests/ftrace/test.d/ftrace/func-filter-notrace-pid.tc
---------------------------