[for-next][PATCH 00/17] tracing: multi-buffers with snapshots, per_cpu and some debugging tools

[Steven Rostedt <rostedt@goodmis.org>]

Here's more updates for linux-next.

I rebased the series on top of my last pull request of
 tip/perf/urgent.

Here I made the multi-buffers work with the snapshots, as well as
added per-cpu directory for the snapshots.

I added a snapshot_raw to allow tools to pull in the binary data
of the snapshot so that it can be analyzed better.

I removed the max_tr and added two trace buffers into the trace_array.
This actually makes things much simpler, and I really should have
designed ftrace to do this from day one. It makes things so much easier.

I added an internal tracing tool called tracing_snapshot() and
tracing_snapshot_alloc(). This will allow a developer to place in
the kernel a way to say "snapshot" here, and let the tracing
continue in case there's a better place to take a snapshot.

Note, tracing_snapshot() will fail if the snapshot buffer was never
allocated, but tracing_snapshot_alloc() needs to be called from
a context that can sleep (or early boot up). When debugging, it's
best to through in a tracing_snapshot_alloc() early on so that
it will be ready to use. Hmm, I should also add a kernel command
line parameter to allocate it on boot up. Darn, I thought I was
done for 3.10. That will need to be next :-/

Enjoy,

-- Steve

Steven Rostedt (Red Hat) (17):
      ring-buffer: Init waitqueue for blocked readers
      tracing: Add comment for trace event flag IGNORE_ENABLE
      tracing: Only clear trace buffer on module unload if event was traced
      tracing: Clear all trace buffers when unloaded module event was used
      tracing: Enable snapshot when any latency tracer is enabled
      tracing: Consolidate max_tr into main trace_array structure
      tracing: Add snapshot in the per_cpu trace directories
      tracing: Add config option to allow snapshot to swap per cpu
      tracing: Add snapshot_raw to extract the raw data from snapshot
      tracing: Have trace_array keep track if snapshot buffer is allocated
      tracing: Consolidate buffer allocation code
      tracing: Add snapshot feature to instances
      tracing: Add per_cpu directory into tracing instances
      tracing: Prevent deleting instances when they are being read
      tracing: Add internal tracing_snapshot() functions
      ring-buffer: Do not use schedule_work_on() for current CPU
      tracing: Move the tracing selftest code into its own function

----
 include/linux/ftrace_event.h         |    8 +
 include/linux/kernel.h               |    4 +
 kernel/trace/Kconfig                 |   26 +
 kernel/trace/blktrace.c              |    4 +-
 kernel/trace/ring_buffer.c           |   35 +-
 kernel/trace/trace.c                 |  997 ++++++++++++++++++++++------------
 kernel/trace/trace.h                 |   40 +-
 kernel/trace/trace_events.c          |   20 +-
 kernel/trace/trace_functions.c       |    8 +-
 kernel/trace/trace_functions_graph.c |   12 +-
 kernel/trace/trace_irqsoff.c         |   10 +-
 kernel/trace/trace_kdb.c             |    8 +-
 kernel/trace/trace_mmiotrace.c       |   12 +-
 kernel/trace/trace_output.c          |    2 +-
 kernel/trace/trace_sched_switch.c    |    8 +-
 kernel/trace/trace_sched_wakeup.c    |   16 +-
 kernel/trace/trace_selftest.c        |   42 +-
 kernel/trace/trace_syscalls.c        |    4 +-
 18 files changed, 824 insertions(+), 432 deletions(-)