From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail138.messagelabs.com (mail138.messagelabs.com [216.82.249.35]) by kanga.kvack.org (Postfix) with SMTP id AE8DD6B0104 for ; Wed, 13 Oct 2010 03:17:28 -0400 (EDT) Received: from m2.gw.fujitsu.co.jp ([10.0.50.72]) by fgwmail7.fujitsu.co.jp (Fujitsu Gateway) with ESMTP id o9D7HQlj030299 for (envelope-from kamezawa.hiroyu@jp.fujitsu.com); Wed, 13 Oct 2010 16:17:26 +0900 Received: from smail (m2 [127.0.0.1]) by outgoing.m2.gw.fujitsu.co.jp (Postfix) with ESMTP id E8B1345DE55 for ; Wed, 13 Oct 2010 16:17:25 +0900 (JST) Received: from s2.gw.fujitsu.co.jp (s2.gw.fujitsu.co.jp [10.0.50.92]) by m2.gw.fujitsu.co.jp (Postfix) with ESMTP id BE98845DE4E for ; Wed, 13 Oct 2010 16:17:25 +0900 (JST) Received: from s2.gw.fujitsu.co.jp (localhost.localdomain [127.0.0.1]) by s2.gw.fujitsu.co.jp (Postfix) with ESMTP id A57A9E18005 for ; Wed, 13 Oct 2010 16:17:25 +0900 (JST) Received: from m108.s.css.fujitsu.com (m108.s.css.fujitsu.com [10.249.87.108]) by s2.gw.fujitsu.co.jp (Postfix) with ESMTP id 5F6F3E08002 for ; Wed, 13 Oct 2010 16:17:25 +0900 (JST) Date: Wed, 13 Oct 2010 16:12:06 +0900 From: KAMEZAWA Hiroyuki Subject: Re: [RFC][PATCH 1/3] contigous big page allocator Message-Id: <20101013161206.c29df8ea.kamezawa.hiroyu@jp.fujitsu.com> In-Reply-To: <87sk0a1sq0.fsf@basil.nowhere.org> References: <20101013121527.8ec6a769.kamezawa.hiroyu@jp.fujitsu.com> <87sk0a1sq0.fsf@basil.nowhere.org> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: Andi Kleen Cc: "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , "minchan.kim@gmail.com" , fujita.tomonori@lab.ntt.co.jp List-ID: On Wed, 13 Oct 2010 09:01:43 +0200 Andi Kleen wrote: > KAMEZAWA Hiroyuki writes: > > > > What this wants to do: > > allocates a contiguous chunk of pages larger than MAX_ORDER. > > for device drivers (camera? etc..) > > I think to really move forward you need a concrete use case > actually implemented in tree. > yes. I heard there were users at LinuxCon Japan, so restarted. I heared video-for-linux + ARM wants this. I found this thread, now. http://kerneltrap.org/mailarchive/linux-kernel/2010/10/10/4630166 Hmm. > > My intention is not for allocating HUGEPAGE(> MAX_ORDER). > > I still believe using this for 1GB pages would be one of the more > interesting use cases. > I'm successfully allocating 1GB of continous pages at test. But I'm not sure requirements and users. How quick this allocation should be ? For example, if prep_new_page() for 1GB page is slow, what kind of chunk-of-page construction is the best. THanks, -Kame -- 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