From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail138.messagelabs.com (mail138.messagelabs.com [216.82.249.35]) by kanga.kvack.org (Postfix) with SMTP id 844746B004D for ; Tue, 16 Mar 2010 22:28:31 -0400 (EDT) Received: from m6.gw.fujitsu.co.jp ([10.0.50.76]) by fgwmail6.fujitsu.co.jp (Fujitsu Gateway) with ESMTP id o2H2SSss018568 for (envelope-from kosaki.motohiro@jp.fujitsu.com); Wed, 17 Mar 2010 11:28:28 +0900 Received: from smail (m6 [127.0.0.1]) by outgoing.m6.gw.fujitsu.co.jp (Postfix) with ESMTP id 08E6E45DE4E for ; Wed, 17 Mar 2010 11:28:28 +0900 (JST) Received: from s6.gw.fujitsu.co.jp (s6.gw.fujitsu.co.jp [10.0.50.96]) by m6.gw.fujitsu.co.jp (Postfix) with ESMTP id B795545DE4F for ; Wed, 17 Mar 2010 11:28:27 +0900 (JST) Received: from s6.gw.fujitsu.co.jp (localhost.localdomain [127.0.0.1]) by s6.gw.fujitsu.co.jp (Postfix) with ESMTP id 699EFE38007 for ; Wed, 17 Mar 2010 11:28:27 +0900 (JST) Received: from ml14.s.css.fujitsu.com (ml14.s.css.fujitsu.com [10.249.87.104]) by s6.gw.fujitsu.co.jp (Postfix) with ESMTP id 0F4F41DB8016 for ; Wed, 17 Mar 2010 11:28:27 +0900 (JST) From: KOSAKI Motohiro Subject: Re: [PATCH 04/11] Allow CONFIG_MIGRATION to be set without CONFIG_NUMA or memory hot-remove In-Reply-To: <1268412087-13536-5-git-send-email-mel@csn.ul.ie> References: <1268412087-13536-1-git-send-email-mel@csn.ul.ie> <1268412087-13536-5-git-send-email-mel@csn.ul.ie> Message-Id: <20100317110748.4C94.A69D9226@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Date: Wed, 17 Mar 2010 11:28:26 +0900 (JST) Sender: owner-linux-mm@kvack.org To: Mel Gorman Cc: kosaki.motohiro@jp.fujitsu.com, Andrew Morton , Andrea Arcangeli , Christoph Lameter , Adam Litke , Avi Kivity , David Rientjes , Rik van Riel , linux-kernel@vger.kernel.org, linux-mm@kvack.org List-ID: > CONFIG_MIGRATION currently depends on CONFIG_NUMA or on the architecture > being able to hot-remove memory. The main users of page migration such as > sys_move_pages(), sys_migrate_pages() and cpuset process migration are > only beneficial on NUMA so it makes sense. > > As memory compaction will operate within a zone and is useful on both NUMA > and non-NUMA systems, this patch allows CONFIG_MIGRATION to be set if the > user selects CONFIG_COMPACTION as an option. > > Signed-off-by: Mel Gorman > Reviewed-by: Christoph Lameter > Reviewed-by: Rik van Riel > Reviewed-by: KAMEZAWA Hiroyuki > --- > mm/Kconfig | 20 ++++++++++++++++---- > 1 files changed, 16 insertions(+), 4 deletions(-) > > diff --git a/mm/Kconfig b/mm/Kconfig > index 9c61158..04e241b 100644 > --- a/mm/Kconfig > +++ b/mm/Kconfig > @@ -172,17 +172,29 @@ config SPLIT_PTLOCK_CPUS > default "4" > > # > +# support for memory compaction > +config COMPACTION > + bool "Allow for memory compaction" > + def_bool y > + select MIGRATION > + depends on EXPERIMENTAL && HUGETLBFS && MMU > + help > + Allows the compaction of memory for the allocation of huge pages. > + If select MIGRATION works, we can remove "depends on NUMA || ARCH_ENABLE_MEMORY_HOTREMOVE" line from config MIGRATION. > +# > # support for page migration > # > config MIGRATION > bool "Page migration" > def_bool y > - depends on NUMA || ARCH_ENABLE_MEMORY_HOTREMOVE > + depends on NUMA || ARCH_ENABLE_MEMORY_HOTREMOVE || COMPACTION > help > Allows the migration of the physical location of pages of processes > - while the virtual addresses are not changed. This is useful for > - example on NUMA systems to put pages nearer to the processors accessing > - the page. > + while the virtual addresses are not changed. This is useful in > + two situations. The first is on NUMA systems to put pages nearer > + to the processors accessing. The second is when allocating huge > + pages as migration can relocate pages to satisfy a huge page > + allocation instead of reclaiming. > > config PHYS_ADDR_T_64BIT > def_bool 64BIT || ARCH_PHYS_ADDR_T_64BIT > -- > 1.6.5 > -- 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