From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Ahern <dsahern@gmail.com>
Subject: Re: Perf event for Wall-time based sampling?
Date: Thu, 18 Sep 2014 14:39:24 -0600
Message-ID: <541B42FC.5000105@gmail.com>
References: <2221771.b2oSN5LR6X@milian-kdab2> <2297882.Vc1x1zOfA6@milian-kdab2> <20140918155745.GH2770@kernel.org> <45528931.El8SOGvs6Z@milian-kdab2> <20140918191713.GK2770@kernel.org> <541B3DED.1010306@gmail.com> <20140918203625.GM2770@kernel.org>
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To: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Milian Wolff <mail@milianw.de>, linux-perf-users <linux-perf-users@vger.kernel.org>, Namhyung Kim <namhyung@gmail.com>, Ingo Molnar <mingo@kernel.org>, Joseph Schuchart <joseph.schuchart@tu-dresden.de>

On 9/18/14, 2:36 PM, Arnaldo Carvalho de Melo wrote:
> I'm just trying to figure out if what people want is a complete
> backtrace of all threads in a process, no matter what they are doing, at
> some given time, i.e. at "sysrq-t" time, is that the case?

I think so. That's what poor-man's profiler is doing -- attach gdb every 
N seconds, dump stack. In perf terminology generate a sample and include 
the callchain.

David