From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from d12nrmr1607.megacenter.de.ibm.com (d12nrmr1607.megacenter.de.ibm.com [9.149.167.49]) by mtagate4.de.ibm.com (8.13.6/8.13.6) with ESMTP id k3PAiNtw045828 for ; Tue, 25 Apr 2006 10:44:23 GMT Received: from d12av02.megacenter.de.ibm.com (d12av02.megacenter.de.ibm.com [9.149.165.228]) by d12nrmr1607.megacenter.de.ibm.com (8.12.10/NCO/VER6.8) with ESMTP id k3PAjSKp114940 for ; Tue, 25 Apr 2006 12:45:28 +0200 Received: from d12av02.megacenter.de.ibm.com (loopback [127.0.0.1]) by d12av02.megacenter.de.ibm.com (8.12.11/8.13.3) with ESMTP id k3PAiMBV009402 for ; Tue, 25 Apr 2006 12:44:23 +0200 Subject: Re: Page host virtual assist patches. From: Martin Schwidefsky Reply-To: schwidefsky@de.ibm.com In-Reply-To: <20060425013712.365892c2.akpm@osdl.org> References: <20060424123412.GA15817@skybase> <20060424180138.52e54e5c.akpm@osdl.org> <444DCD87.2030307@yahoo.com.au> <1145953914.5282.21.camel@localhost> <20060425013712.365892c2.akpm@osdl.org> Content-Type: text/plain Date: Tue, 25 Apr 2006 12:44:27 +0200 Message-Id: <1145961867.5282.46.camel@localhost> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Andrew Morton Cc: nickpiggin@yahoo.com.au, linux-mm@kvack.org, frankeh@watson.ibm.com, rhim@cc.gatech.edu List-ID: On Tue, 2006-04-25 at 01:37 -0700, Andrew Morton wrote: > > The point here is WHO does the reclaim. Sure we can do the reclaim in > > the guest but it is the host that has the memory pressure. To call into > > the guest is not a good idea, if you have an idle guest you generally > > increase the memory pressure because some of the guests pages might have > > been swapped which are needed if the guest has to do the reclaim. > > Cannot the guests employ text sharing? Yes we can. We even had some patches for sharing the kernel text between virtual machines. But the kernel text is only a small part of the memory that gets accessed for a vmscan operation. -- blue skies, Martin. Martin Schwidefsky Linux for zSeries Development & Services IBM Deutschland Entwicklung GmbH "Reality continues to ruin my life." - Calvin. -- 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