From: Steven Rostedt (Red Hat) <rostedt@goodmis.org>
Date: Tue, 12 Mar 2013 15:49:18 +0000 (-0400)
Subject: tracing: Add snapshot trigger to function probes
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~134^2~32
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=77fd5c15e3216b901be69047ca43b05ae9099951;p=pandora-kernel.git

tracing: Add snapshot trigger to function probes

 echo 'schedule:snapshot:1' > /debug/tracing/set_ftrace_filter

This will cause the scheduler to trigger a snapshot the next time
it's called (you can use any function that's not called by NMI).

Even though it triggers only once, you still need to remove it with:

 echo '!schedule:snapshot:0' > /debug/tracing/set_ftrace_filter

The :1 can be left off for the first command:

 echo 'schedule:snapshot' > /debug/tracing/set_ftrace_filter

But this will cause all calls to schedule to trigger a snapshot.
This must be removed without the ':0'

 echo '!schedule:snapshot' > /debug/tracing/set_ftrace_filter

As adding a "count" is a different operation (internally).

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