linux-kernel - Re: [RFC] [PATCH 7/7] Ftrace plugin for Uprobes

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Message-ID: <20100118130048.GA10364@nowhere>
Date:	Mon, 18 Jan 2010 14:00:51 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	utrace-devel <utrace-devel@...hat.com>,
	Jim Keniston <jkenisto@...ibm.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Maneesh Soni <maneesh@...ibm.com>,
	Mark Wielaard <mjw@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] [PATCH 7/7] Ftrace plugin for Uprobes

On Thu, Jan 14, 2010 at 01:29:09PM +0100, Peter Zijlstra wrote:
> On Thu, 2010-01-14 at 13:23 +0100, Frederic Weisbecker wrote:
> > 
> > I see, so what you suggest is to have the probe set up
> > as generic first. Then the process that activates it
> > becomes a consumer, right?
> 
> Right, so either we have it always on, for things like ftrace, 
> 
>   in which case the creation traverses rmap and installs the probes
>   all existing mmap()s, and a mmap() hook will install it on all new
>   ones.
> 
> Or they're strictly consumer driver, like perf, in which case the act of
> enabling the event will install the probe (if its not there yet).
> 


Looks like a good plan.

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