linux-kernel - Re: x86_64: potential critical issue with quicklists and page table pages

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Message-ID: <Pine.LNX.4.64.0709211149040.17160@schroedinger.engr.sgi.com>
Date:	Fri, 21 Sep 2007 11:50:01 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
cc:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	akpm@...ux-foundation.org, ak@...e.de,
	linux-kernel@...r.kernel.org, tony.luck@...el.com,
	asit.k.mallick@...el.com
Subject: Re: x86_64: potential critical issue with quicklists and page table
 pages

On Fri, 21 Sep 2007, Linus Torvalds wrote:

> > Can we revert this commit for 2.6.23 and look at this code post 2.6.23?
> 
> I'll happily revert it, but I want to understand this better, so more of 
> an explanation of the codepath that actually does something wrong, please.

The quicklists collect pages while we gather pages for TLB flushing. 
These pages must be kept until the actual TLB flush has occurred. The 
optimization of releasing off node pages early is therefore not valid.

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