From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f45.google.com (mail-pa0-f45.google.com [209.85.220.45]) by kanga.kvack.org (Postfix) with ESMTP id 60F226B0035 for ; Fri, 22 Aug 2014 00:03:11 -0400 (EDT) Received: by mail-pa0-f45.google.com with SMTP id eu11so15745725pac.4 for ; Thu, 21 Aug 2014 21:03:10 -0700 (PDT) Received: from mga01.intel.com (mga01.intel.com. [192.55.52.88]) by mx.google.com with ESMTP id nr8si39016253pdb.213.2014.08.21.21.03.09 for ; Thu, 21 Aug 2014 21:03:10 -0700 (PDT) Date: Fri, 22 Aug 2014 12:04:20 +0800 From: Wanpeng Li Subject: Re: [PATCH 0/6] mm/hugetlb: gigantic hugetlb page pools shrink supporting Message-ID: <20140822040420.GA4756@kernel> Reply-To: Wanpeng Li References: <1365066554-29195-1-git-send-email-liwanp@linux.vnet.ibm.com> <20130411232907.GC29398@hacker.(null)> <20130412152237.GM16732@two.firstfloor.org> <20140821233729.GB2420@kernel> <53F69E26.1090408@cn.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <53F69E26.1090408@cn.fujitsu.com> Sender: owner-linux-mm@kvack.org List-ID: To: Zhang Yanfei Cc: Andi Kleen , Andrew Morton , Andi Kleen , KAMEZAWA Hiroyuki , "Aneesh Kumar K.V" , Michal Hocko , Mel Gorman , Rik van Riel , Hillf Danton , linux-mm@kvack.org, linux-kernel@vger.kernel.org On Fri, Aug 22, 2014 at 09:34:30AM +0800, Zhang Yanfei wrote: >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 > > Ah, thanks for your pointing out. Regards, Wanpeng Li >> >> 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 > >-- >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, 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