From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759092Ab3BTLcH (ORCPT ); Wed, 20 Feb 2013 06:32:07 -0500 Received: from mail-yh0-f44.google.com ([209.85.213.44]:42640 "EHLO mail-yh0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758727Ab3BTLcF (ORCPT ); Wed, 20 Feb 2013 06:32:05 -0500 Message-ID: <5124B42A.1020908@gmail.com> Date: Wed, 20 Feb 2013 19:31:54 +0800 From: Simon Jeons User-Agent: Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130106 Thunderbird/17.0.2 MIME-Version: 1.0 To: Lin Feng 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> <5124A42B.1020905@cn.fujitsu.com> In-Reply-To: <5124A42B.1020905@cn.fujitsu.com> Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 02/20/2013 06:23 PM, Lin Feng wrote: > 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. Ok, I'm curious about userspace process call which funtion(will call gup) to pin pages except make_pages_present? > > thanks, > linfeng From mboxrd@z Thu Jan 1 00:00:00 1970 From: Simon Jeons 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 19:31:54 +0800 Message-ID: <5124B42A.1020908@gmail.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> <5124A42B.1020905@cn.fujitsu.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15; format=flowed 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: Lin Feng Return-path: In-Reply-To: <5124A42B.1020905@cn.fujitsu.com> Sender: owner-linux-mm@kvack.org List-Id: linux-fsdevel.vger.kernel.org On 02/20/2013 06:23 PM, Lin Feng wrote: > 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. Ok, I'm curious about userspace process call which funtion(will call gup) to pin pages except make_pages_present? > > 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