From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx126.postini.com [74.125.245.126]) by kanga.kvack.org (Postfix) with SMTP id 458B46B00DD for ; Mon, 15 Jul 2013 07:31:22 -0400 (EDT) Received: from /spool/local by e28smtp05.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 15 Jul 2013 16:55:46 +0530 Received: from d28relay04.in.ibm.com (d28relay04.in.ibm.com [9.184.220.61]) by d28dlp03.in.ibm.com (Postfix) with ESMTP id 53F2E1258053 for ; Mon, 15 Jul 2013 17:00:33 +0530 (IST) Received: from d28av04.in.ibm.com (d28av04.in.ibm.com [9.184.220.66]) by d28relay04.in.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r6FBV98J28311638 for ; Mon, 15 Jul 2013 17:01:09 +0530 Received: from d28av04.in.ibm.com (loopback [127.0.0.1]) by d28av04.in.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id r6FBVB2q004860 for ; Mon, 15 Jul 2013 21:31:12 +1000 Date: Mon, 15 Jul 2013 19:31:09 +0800 From: Wanpeng Li Subject: Re: [PATCH 0/6] mm/hugetlb: gigantic hugetlb page pools shrink supporting Message-ID: <20130715113109.GA22207@hacker.(null)> 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> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20130412152237.GM16732@two.firstfloor.org> Sender: owner-linux-mm@kvack.org List-ID: To: Andi Kleen Cc: 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 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. How is your allocate hugetlb pages from CMA going on? If you don't have time I will have a try. ;-) 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, 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