From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755643AbaHVBgW (ORCPT ); Thu, 21 Aug 2014 21:36:22 -0400 Received: from cn.fujitsu.com ([59.151.112.132]:33279 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1755514AbaHVBgV (ORCPT ); Thu, 21 Aug 2014 21:36:21 -0400 X-IronPort-AV: E=Sophos;i="5.04,377,1406563200"; d="scan'208";a="34922644" Message-ID: <53F69E26.1090408@cn.fujitsu.com> Date: Fri, 22 Aug 2014 09:34:30 +0800 From: Zhang Yanfei User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20131030 Thunderbird/17.0.10 MIME-Version: 1.0 To: Wanpeng Li CC: Andi Kleen , Andrew Morton , Andi Kleen , KAMEZAWA Hiroyuki , "Aneesh Kumar K.V" , Michal Hocko , Mel Gorman , Rik van Riel , Hillf Danton , , Subject: Re: [PATCH 0/6] mm/hugetlb: gigantic hugetlb page pools shrink supporting References: <1365066554-29195-1-git-send-email-liwanp@linux.vnet.ibm.com> <20130411232907.GC29398@hacker.(null)> <20130412152237.GM16732@two.firstfloor.org> <20140821233729.GB2420@kernel> In-Reply-To: <20140821233729.GB2420@kernel> Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.167.225.89] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello Wanpeng On 08/22/2014 07:37 AM, Wanpeng Li wrote: > Hi Andi, > On Fri, Apr 12, 2013 at 05:22:37PM +0200, Andi Kleen wrote: >> On Fri, Apr 12, 2013 at 07:29:07AM +0800, Wanpeng Li wrote: >>> Ping Andi, >>> On Thu, Apr 04, 2013 at 05:09:08PM +0800, Wanpeng Li wrote: >>>> order >= MAX_ORDER pages are only allocated at boot stage using the >>>> bootmem allocator with the "hugepages=xxx" option. These pages are never >>>> free after boot by default since it would be a one-way street(>= MAX_ORDER >>>> pages cannot be allocated later), but if administrator confirm not to >>>> use these gigantic pages any more, these pinned pages will waste memory >>>> since other users can't grab free pages from gigantic hugetlb pool even >>>> if OOM, it's not flexible. The patchset add hugetlb gigantic page pools >>>> shrink supporting. Administrator can enable knob exported in sysctl to >>>> permit to shrink gigantic hugetlb pool. >> >> >> I originally didn't allow this because it's only one way and it seemed >> dubious. I've been recently working on a new patchkit to allocate >> GB pages from CMA. With that freeing actually makes sense, as >> the pages can be reallocated. >> > > More than one year past, If your allocate GB pages from CMA merged? commit 944d9fec8d7aee3f2e16573e9b6a16634b33f403 Author: Luiz Capitulino Date: Wed Jun 4 16:07:13 2014 -0700 hugetlb: add support for gigantic page allocation at runtime > > Regards, > Wanpeng Li > >> -Andi >> >> -- >> 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 > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > . > -- Thanks. Zhang Yanfei