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

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Message-ID: <1263472149.4244.314.camel@laptop>
Date:	Thu, 14 Jan 2010 13:29:09 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
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, 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).

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