linux-kernel - Re: [RFC] [PATCH 4/7] Uprobes Implementation

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Message-ID: <20100115131037.GP4822@redhat.com>
Date:	Fri, 15 Jan 2010 08:10:37 -0500
From:	"Frank Ch. Eigler" <fche@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Jim Keniston <jkenisto@...ibm.com>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Mark Wielaard <mjw@...hat.com>,
	utrace-devel <utrace-devel@...hat.com>
Subject: Re: [RFC] [PATCH 4/7] Uprobes Implementation

Hi -

> > > Then we can ditch the whole utrace muck as I see no reason to want to
> > > use that, whereas the ubp (given a sane name) looks interesting.
> > 
> > Assuming you meant what you write, perhaps you misunderstand the
> > layering relationship of these pieces.  utrace underlies uprobes and
> > other process manipulation functionality, present and future.
> 
> Why, utrace doesn't at all look to bring a fundamental contribution to
> all that. If there's a proper kernel interface to install probes on
> userspace code (ubp seems to be mostly that) then I can use perf/ftrace
> to do the rest of the state management, no need to use utrace there.

> You can hardly force me to use utrace there, can you?

utrace is not a form of punishment inflicted upon the undeserving.  It
is a service layer that uprobes et alii are built upon.  You as a
potential uprobes client need not also talk directly to it, if you
wish to reimplement task-finder-like services some other way.

- FChE
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