From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758600AbYFLTGT (ORCPT ); Thu, 12 Jun 2008 15:06:19 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754110AbYFLTGL (ORCPT ); Thu, 12 Jun 2008 15:06:11 -0400 Received: from mx1.redhat.com ([66.187.233.31]:50439 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753869AbYFLTGK (ORCPT ); Thu, 12 Jun 2008 15:06:10 -0400 Date: Thu, 12 Jun 2008 15:05:58 -0400 From: Rik van Riel To: Lee Schermerhorn Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, Nick Piggin Subject: Re: [PATCH] undo the brd.c part of ramfs-and-ram-disk-pages-are-unevictable.patch Message-ID: <20080612150558.5c8e92a4@cuia.bos.redhat.com> In-Reply-To: <1213297257.6240.15.camel@lts-notebook> References: <20080612135353.2d17436a@cuia.bos.redhat.com> <1213297257.6240.15.camel@lts-notebook> Organization: Red Hat, Inc X-Mailer: Claws Mail 3.3.1 (GTK+ 2.12.5; i386-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 12 Jun 2008 15:00:57 -0400 Lee Schermerhorn wrote: > On Thu, 2008-06-12 at 13:53 -0400, Rik van Riel wrote: > > Undo the brd.c part of ramfs-and-ram-disk-pages-are-unevictable.patch. > > The brd pages do not live on the LRU at all, so there is no need to > > play these tricks. > > Does this mean that these pages cannot be migrated? E.g., to evacuate > memory for hotplug? Looks like all paths to migrate_pages() construct a > list of pages to migrate by isolating them from the lru > [isolate_lru_page()]. Any pages not found in the lru are skipped. It looks like that, indeed. -- All Rights Reversed