linux-kernel - Re: [PATCH v3 0/10] Uprobes v3

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Message-ID: <1273671560.1626.114.camel@laptop>
Date:	Wed, 12 May 2010 15:39:20 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	ananth@...ibm.com
Cc:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Mel Gorman <mel@....ul.ie>,
	Randy Dunlap <rdunlap@...otime.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Roland McGrath <roland@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Oleg Nesterov <oleg@...hat.com>,
	Mark Wielaard <mjw@...hat.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Rik van Riel <riel@...hat.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH v3 0/10] Uprobes v3

On Wed, 2010-05-12 at 18:57 +0530, Ananth N Mavinakayanahalli wrote:
> Now, as long as we have the housekeeping code to handle the
> possibility of a thread hitting the said breakpoint when its being
> removed, is it safe to assume atomicity for replacing one byte of
> possibly a longer instruction? 

Dunno I'm not a hardware guy, but the issue is so simple to side-step
I'm not sure why you're arguing for relying on these special semantics.



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