linux-kernel - Re: [RFC] tracing: Adding cgroup aware tracing functionality

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Message-ID: <20110408203827.GA26667@nowhere>
Date:	Fri, 8 Apr 2011 22:38:29 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	David Sharp <dhsharp@...gle.com>,
	Vaibhav Nagarnaik <vnagarnaik@...gle.com>,
	Paul Menage <menage@...gle.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Stephane Eranian <eranian@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Michael Rubin <mrubin@...gle.com>,
	Ken Chen <kenchen@...gle.com>, linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [RFC] tracing: Adding cgroup aware tracing functionality

On Fri, Apr 08, 2011 at 09:00:56PM +0200, Frederic Weisbecker wrote:
> On Fri, Apr 08, 2011 at 03:37:48AM -0400, Steven Rostedt wrote:
> > I actually agree, as perf is more focused on per process (or group) than
> > ftrace. But that said, I guess the issue is also, if they have a simple
> > solution that is not invasive and suits their needs, what's the harm in
> > accepting it?
> 
> What about a kind of cgroup_of(path) operator that we can use on
> filters?
> 
> 	common_pid cgroup_of(path)
> or
> 	common_pid __cgroup_of__ path
> 
> That way you don't bloat the tracing fast path?

Note in this example, we would simply ignore the common_pid
value and assume that pid is the one of current. This economizes
a step to pid -> task resolution.
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