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

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Message-ID: <1263468191.4244.300.camel@laptop>
Date:	Thu, 14 Jan 2010 12:23:11 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	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>,
	Frederic Weisbecker <fweisbec@...il.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 Mon, 2010-01-11 at 17:56 +0530, Srikar Dronamraju wrote:
> This patch implements ftrace plugin for uprobes.

Right, like others have said, trace events is a much saner interface.

So the easiest way I can see that working is to register uprobes against
a file (not a pid). Then on creation it uses rmap to find all current
maps of that file and install the probe if there is a consumer for that
map.

Then for each new mmap() of that file, we also need to check if there's
a consumer ready and install the probe.

The existence of the uprobe trace-event would keep a ref on the
dentry/inode, ensuring it remains around or something.

Consumers could be some utrace thing (currently called uprobe -- which
is a misnomer imo), or perf, or ftrace like.

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