From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yasuaki Ishimatsu Date: Mon, 10 Sep 2012 01:46:37 +0000 Subject: Re: [RFC v8 PATCH 00/20] memory-hotplug: hot-remove physical memory Message-Id: <504D467D.2080201@jp.fujitsu.com> List-Id: References: <1346148027-24468-1-git-send-email-wency@cn.fujitsu.com> <20120831134956.fec0f681.akpm@linux-foundation.org> In-Reply-To: <20120831134956.fec0f681.akpm@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: wency@cn.fujitsu.com Cc: Andrew Morton , x86@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-acpi@vger.kernel.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, linux-ia64@vger.kernel.org, cmetcalf@tilera.com, sparclinux@vger.kernel.org, rientjes@google.com, liuj97@gmail.com, len.brown@intel.com, benh@kernel.crashing.org, paulus@samba.org, cl@linux.com, minchan.kim@gmail.com, kosaki.motohiro@jp.fujitsu.com Hi Wen, 2012/09/01 5:49, Andrew Morton wrote: > On Tue, 28 Aug 2012 18:00:07 +0800 > wency@cn.fujitsu.com wrote: > >> This patch series aims to support physical memory hot-remove. > > Have you had much review and testing feedback yet? > >> The patches can free/remove the following things: >> >> - acpi_memory_info : [RFC PATCH 4/19] >> - /sys/firmware/memmap/X/{end, start, type} : [RFC PATCH 8/19] >> - iomem_resource : [RFC PATCH 9/19] >> - mem_section and related sysfs files : [RFC PATCH 10-11, 13-16/19] >> - page table of removed memory : [RFC PATCH 12/19] >> - node and related sysfs files : [RFC PATCH 18-19/19] >> >> If you find lack of function for physical memory hot-remove, please let me >> know. > > I doubt if many people have hardware which permits physical memory > removal? How would you suggest that people with regular hardware can > test these chagnes? How do you test the patch? As Andrew says, for hot-removing memory, we need a particular hardware. I think so too. So many people may want to know how to test the patch. If we apply following patch to kvm guest, can we hot-remove memory on kvm guest? http://lists.gnu.org/archive/html/qemu-devel/2012-07/msg01389.html Thanks, Yasuaki Ishimatsu > >> Known problems: >> 1. memory can't be offlined when CONFIG_MEMCG is selected. > > That's quite a problem! Do you have a description of why this is the > case, and a plan for fixing it? >