From: Török Edwin <edwintorok@gmail.com>
Date: Sat, 22 Nov 2008 11:28:47 +0000 (+0200)
Subject: tracing: add support for userspace stacktraces in tracing/iter_ctrl
X-Git-Tag: v2.6.29-rc1~586^2~49^8~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=02b67518e2b1c490787dac7f35e1204e74fe21ba;p=pandora-kernel.git

tracing: add support for userspace stacktraces in tracing/iter_ctrl

Impact: add new (default-off) tracing visualization feature

Usage example:

 mount -t debugfs nodev /sys/kernel/debug
 cd /sys/kernel/debug/tracing
 echo userstacktrace >iter_ctrl
 echo sched_switch >current_tracer
 echo 1 >tracing_enabled
 .... run application ...
 echo 0 >tracing_enabled

Then read one of 'trace','latency_trace','trace_pipe'.

To get the best output you can compile your userspace programs with
frame pointers (at least glibc + the app you are tracing).

Signed-off-by: Török Edwin <edwintorok@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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