linux-kernel - Re: [RFC] page-table walkers vs memory order

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Message-ID: <1343290299.26034.84.camel@twins>
Date:	Thu, 26 Jul 2012 10:11:39 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Nick Piggin <npiggin@...nel.dk>,
	Andrea Arcangeli <aarcange@...hat.com>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [RFC] page-table walkers vs memory order

On Wed, 2012-07-25 at 15:09 -0700, Hugh Dickins wrote:
> We find out after it hits us, and someone studies the disassembly -
> if we're lucky enough to crash near the origin of the problem. 

This is a rather painful way.. see

  https://lkml.org/lkml/2009/1/5/555

we were lucky there in that the lack of ACCESS_ONCE() caused an infinite
loop so we knew exactly where we got stuck.


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