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

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Date:	Thu, 28 Jan 2010 16:21:56 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
cc:	Kyle Moffett <kyle@...fetthome.net>, tytso@....edu,
	"Frank Ch. Eigler" <fche@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Peter Zijlstra <peterz@...radead.org>,
	Fr??d??ric Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Arnaldo Carvalho de Melo <acme@...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



On Fri, 29 Jan 2010, Benjamin Herrenschmidt wrote:
> 
> like returning a fd to poll() on ? :-)

Well, there's the possibility of async polling (rather than the 
synchronous wait that ptrace forces now), but there are other advantages 
to having a "connection" model - like not having to look up the child 
process every time like ptrace does now.

Although 'find_task_by_vpid()' is probably cheap enough that nobody really 
cares. We do a fair job at those hash tables.

			Linus
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