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Date: Mon, 18 Jan 2010 14:00:51 +0100
From: Frederic Weisbecker <fweisbec@gmail.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>, Ingo Molnar <mingo@elte.hu>,
       Arnaldo Carvalho de Melo <acme@infradead.org>,
       Ananth N Mavinakayanahalli <ananth@in.ibm.com>,
       utrace-devel <utrace-devel@redhat.com>,
       Jim Keniston <jkenisto@us.ibm.com>,
       Masami Hiramatsu <mhiramat@redhat.com>,
       Maneesh Soni <maneesh@in.ibm.com>, Mark Wielaard <mjw@redhat.com>,
       LKML <linux-kernel@vger.kernel.org>
Subject: Re: [RFC] [PATCH 7/7] Ftrace plugin for Uprobes
Message-ID: <20100118130048.GA10364@nowhere>
References: <20100111122521.22050.3654.sendpatchset@srikar.in.ibm.com> <20100111122608.22050.94088.sendpatchset@srikar.in.ibm.com> <1263468191.4244.300.camel@laptop> <20100114113509.GB5033@nowhere> <1263469381.4244.308.camel@laptop> <20100114122329.GC5033@nowhere> <1263472149.4244.314.camel@laptop>
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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.