From: Steven Rostedt <srostedt@redhat.com>
Date: Thu, 12 Mar 2009 23:42:29 +0000 (-0400)
Subject: tracing: explain why stack tracer is empty
X-Git-Tag: v2.6.30-rc1~2^2~41^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e447e1df2e568cd43d1918963c9f09fae85aea57;p=pandora-kernel.git

tracing: explain why stack tracer is empty

If the stack tracing is disabled (by default) the stack_trace file
will only contain the header:

 # cat /debug/tracing/stack_trace
        Depth    Size      Location    (0 entries)
        -----    ----      --------

This can be frustrating to a developer that does not realize that the
stack tracer is disabled. This patch adds the following text:

  # cat /debug/tracing/stack_trace
        Depth    Size      Location    (0 entries)
        -----    ----      --------
 #
 #  Stack tracer disabled
 #
 # To enable the stack tracer, either add 'stacktrace' to the
 # kernel command line
 # or 'echo 1 > /proc/sys/kernel/stack_tracer_enabled'
 #

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
---

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