From: Steven Rostedt <srostedt@redhat.com>
Date: Sat, 13 Nov 2010 03:32:11 +0000 (-0500)
Subject: tracing/events: Show real number in array fields
X-Git-Tag: v2.6.38-rc1~490^2~23^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=042957801626465492b9428860de39a3cb2a8219;p=pandora-kernel.git

tracing/events: Show real number in array fields

Currently we have in something like the sched_switch event:

  field:char prev_comm[TASK_COMM_LEN];	offset:12;	size:16;	signed:1;

When a userspace tool such as perf tries to parse this, the
TASK_COMM_LEN is meaningless. This is done because the TRACE_EVENT() macro
simply uses a #len to show the string of the length. When the length is
an enum, we get a string that means nothing for tools.

By adding a static buffer and a mutex to protect it, we can store the
string into that buffer with snprintf and show the actual number.
Now we get:

  field:char prev_comm[16];       offset:12;      size:16;        signed:1;

Something much more useful.

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