From: Steven Rostedt (Red Hat) <srostedt@redhat.com>
Date: Wed, 6 Mar 2013 02:23:55 +0000 (-0500)
Subject: tracing: Add snapshot feature to instances
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~134^2~49
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ce9bae55972b228cf7bac34350c4d2caf8ea0d0b;p=pandora-kernel.git

tracing: Add snapshot feature to instances

Add the "snapshot" file to the the multi-buffer instances.

  cd /sys/kernel/debug/tracing/instances
  mkdir foo
  ls foo
buffer_size_kb  buffer_total_size_kb  events  free_buffer  set_event
snapshot  trace  trace_clock  trace_marker  trace_options  trace_pipe
tracing_on
  cat foo/snapshot
 # tracer: nop
 #
 #
 # * Snapshot is freed *
 #
 # Snapshot commands:
 # echo 0 > snapshot : Clears and frees snapshot buffer
 # echo 1 > snapshot : Allocates snapshot buffer, if not already allocated.
 #                      Takes a snapshot of the main buffer.
 # echo 2 > snapshot : Clears snapshot buffer (but does not allocate)
 #                      (Doesn't have to be '2' works with any number that
 #                       is not a '0' or '1')

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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