linux-kernel - Re: linux-next: add utrace tree

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Date:	Tue, 26 Jan 2010 16:27:06 -0700
From:	Tom Tromey <tromey@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Kyle Moffett <kyle@...fetthome.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Peter Zijlstra <peterz@...radead.org>,
	Fr??d??ric Weisbecker <fweisbec@...il.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	"Frank Ch. Eigler" <fche@...hat.com>, linux-next@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>, utrace-devel@...hat.com,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: linux-next: add utrace tree

Tom> * Use an fd, not SIGCHLD+wait, to report inferior state changes to gdb.
Tom> Internally we're already using a self-pipe to integrate this into
Tom> gdb's main loop.  Relatedly, don't mess with the inferior's parentage.

Andi> How would having a kernel based solution be better over your
Andi> user space simulation?

Signals and wait are a pain because if we want to use some random
library in gdb, there might be conflicts.  This is true even if we use
signalfd.  An fd-for-debugging does not have this problem.  This matters
more now that we're letting people script gdb in python.

Tom
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