linux-kernel - Re: [patches] [PATCH] [1/58] x86: Always flush pages in change_page

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Date:	Mon, 6 Aug 2007 12:36:59 +0200
From:	Andi Kleen <ak@...e.de>
To:	"Jan Beulich" <jbeulich@...ell.com>
Cc:	linux-kernel@...r.kernel.org, patches@...-64.org
Subject: Re: [patches] [PATCH] [1/58] x86: Always flush pages in change_page_attr

On Monday 06 August 2007 12:15:01 Jan Beulich wrote:
> But that is still wrong - you're again flushing the page table page rather than
> the data one. Fixing this was the purpose of the patch I had sent, plus the
> broken reference counting used by the reversion logic. Jan

True. The problem is that we can't necessarily use the LRU list_head of the data
pages though; e.g. when the page is mapped to user space.

I guess we might need to go back to wbinvd again.

What was the remaining problem of the reference counting? 

-Andi

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