Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754868Ab3EMPBt (ORCPT ); Mon, 13 May 2013 11:01:49 -0400 Received: from kanga.kvack.org ([205.233.56.17]:53596 "EHLO kanga.kvack.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752808Ab3EMPBr (ORCPT ); Mon, 13 May 2013 11:01:47 -0400 X-Greylist: delayed 1429 seconds by postgrey-1.27 at vger.kernel.org; Mon, 13 May 2013 11:01:47 EDT Date: Mon, 13 May 2013 11:01:47 -0400 From: Benjamin LaHaise To: Jeff Moyer Cc: Mel Gorman , Tang Chen , Minchan Kim , Lin Feng , akpm@linux-foundation.org, viro@zeniv.linux.org.uk, khlebnikov@openvz.org, walken@google.com, kamezawa.hiroyu@jp.fujitsu.com, riel@redhat.com, rientjes@google.com, isimatu.yasuaki@jp.fujitsu.com, wency@cn.fujitsu.com, laijs@cn.fujitsu.com, jiang.liu@huawei.com, zab@redhat.com, linux-mm@kvack.org, linux-aio@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Marek Szyprowski Subject: Re: [PATCH V2 1/2] mm: hotplug: implement non-movable version of get_user_pages() called get_user_pages_non_movable() Message-ID: <20130513150147.GQ31899@kvack.org> References: <1360056113-14294-1-git-send-email-linfeng@cn.fujitsu.com> <1360056113-14294-2-git-send-email-linfeng@cn.fujitsu.com> <20130205120137.GG21389@suse.de> <20130206004234.GD11197@blaptop> <20130206095617.GN21389@suse.de> <5190AE4F.4000103@cn.fujitsu.com> <20130513091902.GP11497@suse.de> <20130513143757.GP31899@kvack.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.2.2i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 694 Lines: 16 On Mon, May 13, 2013 at 10:54:03AM -0400, Jeff Moyer wrote: > How do you propose to move the ring pages? It's the same problem as doing a TLB shootdown: flush the old pages from userspace's mapping, copy any existing data to the new pages, then repopulate the page tables. It will likely require the addition of address_space_operations for the mapping, but that's not too hard to do. -ben -- "Thought is the essence of where you are now." -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/