linux-kernel - Re: [PATCH v2 7/11] Uprobes Implementation

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Message-ID: <87tyqbbgd7.fsf@basil.nowhere.org>
Date:	Fri, 14 May 2010 00:12:52 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Randy Dunlap <rdunlap@...otime.net>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Roland McGrath <roland@...hat.com>, Mel Gorman <mel@....ul.ie>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH v2 7/11] Uprobes Implementation

Linus Torvalds <torvalds@...ux-foundation.org> writes:

> so arguably it would be good to just make the rule be that you cannot 
> probe a shared mapping. Because whatever you do, it's always the wrong 
> thing.

But isn't text usually shared?  I don't see how you could set any
break points or jump probes on text pages with that restriction.

BTW there were old patches for NUMA text duplication, maybe they could
be resurrected for that too.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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