From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935195Ab3BTLLx (ORCPT ); Wed, 20 Feb 2013 06:11:53 -0500 Received: from cn.fujitsu.com ([222.73.24.84]:2159 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S935176Ab3BTLLu (ORCPT ); Wed, 20 Feb 2013 06:11:50 -0500 X-IronPort-AV: E=Sophos;i="4.84,701,1355068800"; d="scan'208";a="6736142" Message-ID: <5124A42B.1020905@cn.fujitsu.com> Date: Wed, 20 Feb 2013 18:23:39 +0800 From: Lin Feng User-Agent: Mozilla/5.0 (X11; Linux i686; rv:15.0) Gecko/20120911 Thunderbird/15.0.1 MIME-Version: 1.0 To: Simon Jeons CC: Mel Gorman , Andrew Morton , bcrl@kvack.org, viro@zeniv.linux.org.uk, khlebnikov@openvz.org, walken@google.com, kamezawa.hiroyu@jp.fujitsu.com, minchan@kernel.org, riel@redhat.com, rientjes@google.com, isimatu.yasuaki@jp.fujitsu.com, wency@cn.fujitsu.com, laijs@cn.fujitsu.com, jiang.liu@huawei.com, mhocko@suse.cz, linux-mm@kvack.org, linux-aio@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/2] mm: hotplug: implement non-movable version of get_user_pages() called get_user_pages_non_movable() References: <1359972248-8722-1-git-send-email-linfeng@cn.fujitsu.com> <1359972248-8722-2-git-send-email-linfeng@cn.fujitsu.com> <20130204160624.5c20a8a0.akpm@linux-foundation.org> <20130205115722.GF21389@suse.de> <20130205133244.GH21389@suse.de> <51249E3E.9070909@gmail.com> In-Reply-To: <51249E3E.9070909@gmail.com> X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2013/02/20 18:24:34, Serialize by Router on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2013/02/20 18:25:42, Serialize complete at 2013/02/20 18:25:42 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=ISO-8859-15 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Simon, On 02/20/2013 05:58 PM, Simon Jeons wrote: > >> >> The other is that this almost certainly broken for transhuge page >> handling. gup returns the head and tail pages and ordinarily this is ok > > When need gup thp? in kvm case? gup just pins the wanted pages(for x86 is 4k size) of user address space in memory. We can't expect the pages have been allocated for user address space are thp or normal page. So we need to deal with them and I think it have nothing to do with kvm. thanks, linfeng From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lin Feng Subject: Re: [PATCH 1/2] mm: hotplug: implement non-movable version of get_user_pages() called get_user_pages_non_movable() Date: Wed, 20 Feb 2013 18:23:39 +0800 Message-ID: <5124A42B.1020905@cn.fujitsu.com> References: <1359972248-8722-1-git-send-email-linfeng@cn.fujitsu.com> <1359972248-8722-2-git-send-email-linfeng@cn.fujitsu.com> <20130204160624.5c20a8a0.akpm@linux-foundation.org> <20130205115722.GF21389@suse.de> <20130205133244.GH21389@suse.de> <51249E3E.9070909@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: 7bit Cc: Mel Gorman , Andrew Morton , bcrl@kvack.org, viro@zeniv.linux.org.uk, khlebnikov@openvz.org, walken@google.com, kamezawa.hiroyu@jp.fujitsu.com, minchan@kernel.org, riel@redhat.com, rientjes@google.com, isimatu.yasuaki@jp.fujitsu.com, wency@cn.fujitsu.com, laijs@cn.fujitsu.com, jiang.liu@huawei.com, mhocko@suse.cz, linux-mm@kvack.org, linux-aio@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org To: Simon Jeons Return-path: In-Reply-To: <51249E3E.9070909@gmail.com> Sender: owner-linux-aio@kvack.org List-Id: linux-fsdevel.vger.kernel.org Hi Simon, On 02/20/2013 05:58 PM, Simon Jeons wrote: > >> >> The other is that this almost certainly broken for transhuge page >> handling. gup returns the head and tail pages and ordinarily this is ok > > When need gup thp? in kvm case? gup just pins the wanted pages(for x86 is 4k size) of user address space in memory. We can't expect the pages have been allocated for user address space are thp or normal page. So we need to deal with them and I think it have nothing to do with kvm. thanks, linfeng -- To unsubscribe, send a message with 'unsubscribe linux-aio' in the body to majordomo@kvack.org. For more info on Linux AIO, see: http://www.kvack.org/aio/ Don't email: aart@kvack.org From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-ID: <5124A42B.1020905@cn.fujitsu.com> Date: Wed, 20 Feb 2013 18:23:39 +0800 From: Lin Feng MIME-Version: 1.0 Subject: Re: [PATCH 1/2] mm: hotplug: implement non-movable version of get_user_pages() called get_user_pages_non_movable() References: <1359972248-8722-1-git-send-email-linfeng@cn.fujitsu.com> <1359972248-8722-2-git-send-email-linfeng@cn.fujitsu.com> <20130204160624.5c20a8a0.akpm@linux-foundation.org> <20130205115722.GF21389@suse.de> <20130205133244.GH21389@suse.de> <51249E3E.9070909@gmail.com> In-Reply-To: <51249E3E.9070909@gmail.com> Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=ISO-8859-15 Sender: owner-linux-mm@kvack.org List-ID: To: Simon Jeons Cc: Mel Gorman , Andrew Morton , bcrl@kvack.org, viro@zeniv.linux.org.uk, khlebnikov@openvz.org, walken@google.com, kamezawa.hiroyu@jp.fujitsu.com, minchan@kernel.org, riel@redhat.com, rientjes@google.com, isimatu.yasuaki@jp.fujitsu.com, wency@cn.fujitsu.com, laijs@cn.fujitsu.com, jiang.liu@huawei.com, mhocko@suse.cz, linux-mm@kvack.org, linux-aio@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Hi Simon, On 02/20/2013 05:58 PM, Simon Jeons wrote: > >> >> The other is that this almost certainly broken for transhuge page >> handling. gup returns the head and tail pages and ordinarily this is ok > > When need gup thp? in kvm case? gup just pins the wanted pages(for x86 is 4k size) of user address space in memory. We can't expect the pages have been allocated for user address space are thp or normal page. So we need to deal with them and I think it have nothing to do with kvm. thanks, linfeng -- 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