From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx200.postini.com [74.125.245.200]) by kanga.kvack.org (Postfix) with SMTP id B22086B0027 for ; Thu, 11 Apr 2013 19:29:16 -0400 (EDT) Received: from /spool/local by e28smtp07.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Fri, 12 Apr 2013 04:54:41 +0530 Received: from d28relay02.in.ibm.com (d28relay02.in.ibm.com [9.184.220.59]) by d28dlp03.in.ibm.com (Postfix) with ESMTP id AE5461258023 for ; Fri, 12 Apr 2013 05:00:35 +0530 (IST) Received: from d28av04.in.ibm.com (d28av04.in.ibm.com [9.184.220.66]) by d28relay02.in.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r3BNT51n64553166 for ; Fri, 12 Apr 2013 04:59:06 +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 r3BNT8qJ028144 for ; Fri, 12 Apr 2013 09:29:09 +1000 Date: Fri, 12 Apr 2013 07:29:07 +0800 From: Wanpeng Li Subject: Re: [PATCH 0/6] mm/hugetlb: gigantic hugetlb page pools shrink supporting Message-ID: <20130411232907.GC29398@hacker.(null)> Reply-To: Wanpeng Li References: <1365066554-29195-1-git-send-email-liwanp@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1365066554-29195-1-git-send-email-liwanp@linux.vnet.ibm.com> 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, Wanpeng Li 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. > >Testcase: >boot: hugepagesz=1G hugepages=10 > >[root@localhost hugepages]# free -m > total used free shared buffers cached >Mem: 36269 10836 25432 0 11 288 >-/+ buffers/cache: 10537 25732 >Swap: 35999 0 35999 >[root@localhost hugepages]# echo 0 > /sys/kernel/mm/hugepages/hugepages-1048576kB/nr_hugepages >-bash: echo: write error: Invalid argument >[root@localhost hugepages]# echo 1 > /proc/sys/vm/hugetlb_shrink_gigantic_pool >[root@localhost hugepages]# echo 0 > /sys/kernel/mm/hugepages/hugepages-1048576kB/nr_hugepages >[root@localhost hugepages]# free -m > total used free shared buffers cached >Mem: 36269 597 35672 0 11 288 >-/+ buffers/cache: 297 35972 >Swap: 35999 0 35999 > >Wanpeng Li (6): > introduce new sysctl knob which control gigantic page pools shrinking > update_and_free_page gigantic pages awareness > enable gigantic hugetlb page pools shrinking > use already exist huge_page_order() instead of h->order > remove redundant hugetlb_prefault > use already exist interface huge_page_shift > > Documentation/sysctl/vm.txt | 13 +++++++ > include/linux/hugetlb.h | 5 +-- > kernel/sysctl.c | 7 ++++ > mm/hugetlb.c | 83 +++++++++++++++++++++++++++++-------------- > mm/internal.h | 1 + > mm/page_alloc.c | 2 +- > 6 files changed, 82 insertions(+), 29 deletions(-) > >-- >1.7.10.4 -- 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