From mboxrd@z Thu Jan 1 00:00:00 1970 From: Benjamin LaHaise Subject: Re: [PATCH V2 1/2] mm: hotplug: implement non-movable version of get_user_pages() called get_user_pages_non_movable() Date: Tue, 5 Feb 2013 19:52:17 -0500 Message-ID: <20130206005217.GJ20842@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> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Mel Gorman , 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, jmoyer@redhat.com, linux-mm@kvack.org, linux-aio@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org To: Minchan Kim Return-path: Content-Disposition: inline In-Reply-To: <20130206004234.GD11197@blaptop> Sender: owner-linux-aio@kvack.org List-Id: linux-fsdevel.vger.kernel.org On Wed, Feb 06, 2013 at 09:42:34AM +0900, Minchan Kim wrote: > THP degradation by increasing MIGRATE_UNMOVABLE? > Lin said most of GUP pages release the page in short so is it really problem? > Even in embedded, we don't use THP yet but CMA and GUP call would be not too often > but failing of CMA would be critical. > > I'd like to hear opinions. If aio was given a callback to migrate the pages on, it could just migrate the pages as needed. There's nothing fundamental preventing that approach. -ben -- "Thought is the essence of where you are now." -- 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