From mboxrd@z Thu Jan 1 00:00:00 1970 Content-Type: text/plain; charset="iso-8859-1" From: Daniel Phillips Subject: Re: [RFC] Page table sharing Date: Tue, 19 Feb 2002 02:57:57 +0100 References: In-Reply-To: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Message-Id: Sender: owner-linux-mm@kvack.org Return-Path: To: Linus Torvalds , Rik van Riel Cc: Hugh Dickins , dmccr@us.ibm.com, Kernel Mailing List , linux-mm@kvack.org, Robert Love , mingo@redhat.co, Andrew Morton , manfred@colorfullife.com, wli@holomorphy.com List-ID: On February 19, 2002 02:48 am, Linus Torvalds wrote: > On Mon, 18 Feb 2002, Rik van Riel wrote: > > > > We'll need protection from the swapout code. > > Absolutely NOT. > > If the swapout code unshares or shares the PMD, that's a major bug. What it will do is change entries on the page table. We have to be sure two processes don't read/evict the same page in at the same time. > The swapout code doesn't need to know one way or the other, because the > swapout code never actually touches the pmd itself, it just follows the > pointers - it doesn't ever need to worry about the pmd counts at all. That was my original, incomplete view of the situation at first as well. -- Daniel -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/