From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail203.messagelabs.com (mail203.messagelabs.com [216.82.254.243]) by kanga.kvack.org (Postfix) with SMTP id 1633D6B004D for ; Wed, 6 May 2009 08:26:00 -0400 (EDT) Message-ID: <4A0181EA.3070600@redhat.com> Date: Wed, 06 May 2009 08:26:18 -0400 From: Rik van Riel MIME-Version: 1.0 Subject: Re: [PATCH 2/6] ksm: dont allow overlap memory addresses registrations. References: <1241475935-21162-1-git-send-email-ieidus@redhat.com> <1241475935-21162-2-git-send-email-ieidus@redhat.com> <1241475935-21162-3-git-send-email-ieidus@redhat.com> <4A00DD4F.8010101@redhat.com> <4A015C69.7010600@redhat.com> In-Reply-To: <4A015C69.7010600@redhat.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: Izik Eidus Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, aarcange@redhat.com, chrisw@redhat.com, alan@lxorguk.ukuu.org.uk, device@lanana.org, linux-mm@kvack.org, hugh@veritas.com, nickpiggin@yahoo.com.au List-ID: Izik Eidus wrote: > Rik van Riel wrote: >> Izik Eidus wrote: >>> subjects say it all. >> >> Not a very useful commit message. >> >> This makes me wonder, though. >> >> What happens if a user mmaps a 30MB memory region, registers it >> with KSM and then unmaps the middle 10MB? > > User cant break 30MB into smaller one. The user can break up the underlying VMAs though. I am just wondering out loud if we really want two VMA-like objects in the kernel, the VMA itself and a separate KSM object, with different semantics. Maybe this is fine, but I do think it's a question that needs to be thought about. -- All rights reversed. -- 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/ . Don't email: email@kvack.org