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

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Date:	Wed, 27 Jan 2010 17:01:06 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Tom Tromey <tromey@...hat.com>,
	Kyle Moffett <kyle@...fetthome.net>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	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>,
	JimKeniston <jkenisto@...ibm.com>
Subject: Re: linux-next: add utrace tree

On Wed, Jan 27, 2010 at 03:04:58AM -0800, Linus Torvalds wrote:
> 
> 
> On Wed, 27 Jan 2010, Peter Zijlstra wrote:
> > 
> > Right, so there's two aspects:
> > 
> >  1) concurrency when inserting the probe
> 
> That's the one I worried about. Stopping all threads will fix it, 
> obviously at a disastrous performance cost, but what do I care? As noted, 
> there are ways to do it safely with TLB switching, so it's fixable.


That said, inserting a probe is supposed to be a pretty rare
operation, stopping all threads in a process shouldn't be
painful for this aspect.

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