linux-kernel - Re: [PATCH 3/3] utrace-based ftrace "process" engine, v2

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Message-ID: <20090331113832.GG16170@redhat.com>
Date:	Tue, 31 Mar 2009 07:38:32 -0400
From:	"Frank Ch. Eigler" <fche@...hat.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Theodore Tso <tytso@....edu>, oleg@...hat.com,
	adobriyan@...il.com, mingo@...e.hu, torvalds@...ux-foundation.org,
	roland@...hat.com, rostedt@...dmis.org, utrace-devel@...hat.com,
	linux-kernel@...r.kernel.org, tglx@...utronix.de,
	Christoph Hellwig <hch@...radead.org>,
	Jeff Dike <jdike@...toit.com>
Subject: Re: [PATCH 3/3] utrace-based ftrace "process" engine, v2

Hi -

On Tue, Mar 31, 2009 at 11:17:42AM +0200, Peter Zijlstra wrote:

> [...]  Right, from my POV something like utrace is desirable, since
> its basically a huge multiplexer for the debugger state, eventually
> allowing us to have multiple debuggers attached to the same process.
> [...]

Right.

> Then there is this little thing called frysk which uses it, no idea
> what kind of kernel space that needs, nor where it lives -- or for
> that matter, wth it really does ;-)

Frysk was to be a first user of such an improved ptrace(2) API in
order to do the sort of background / multiply-connected debugging, but
that project has been on indefinite hold for about a year.  Instead,
there are experiments under way to extend gdb's backend for that
capability.

- FChE
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