From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from m2.gw.fujitsu.co.jp ([10.0.50.72]) by fgwmail6.fujitsu.co.jp (Fujitsu Gateway) with ESMTP id m933Pwvw013325 for (envelope-from kosaki.motohiro@jp.fujitsu.com); Fri, 3 Oct 2008 12:25:58 +0900 Received: from smail (m2 [127.0.0.1]) by outgoing.m2.gw.fujitsu.co.jp (Postfix) with ESMTP id D7AE31B8020 for ; Fri, 3 Oct 2008 12:25:57 +0900 (JST) Received: from s8.gw.fujitsu.co.jp (s8.gw.fujitsu.co.jp [10.0.50.98]) by m2.gw.fujitsu.co.jp (Postfix) with ESMTP id AC10D2DC01F for ; Fri, 3 Oct 2008 12:25:57 +0900 (JST) Received: from s8.gw.fujitsu.co.jp (localhost.localdomain [127.0.0.1]) by s8.gw.fujitsu.co.jp (Postfix) with ESMTP id 8E41E1DB8040 for ; Fri, 3 Oct 2008 12:25:57 +0900 (JST) Received: from m106.s.css.fujitsu.com (m106.s.css.fujitsu.com [10.249.87.106]) by s8.gw.fujitsu.co.jp (Postfix) with ESMTP id 3DD631DB803A for ; Fri, 3 Oct 2008 12:25:57 +0900 (JST) From: KOSAKI Motohiro Subject: Re: [PATCH 0/4] Reclaim page capture v4 In-Reply-To: <20081002150423.GG11089@brain> References: <28c262360810011946p443350d3hcb271720892e7b85@mail.gmail.com> <20081002150423.GG11089@brain> Message-Id: <20081003122332.EF58.KOSAKI.MOTOHIRO@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Date: Fri, 3 Oct 2008 12:25:56 +0900 (JST) Sender: owner-linux-mm@kvack.org Return-Path: To: Andy Whitcroft Cc: kosaki.motohiro@jp.fujitsu.com, MinChan Kim , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Peter Zijlstra , Christoph Lameter , Rik van Riel , Mel Gorman , Nick Piggin , Andrew Morton List-ID: > > I tested your patch in my desktop. > > The test is just kernel compile with single thread. > > My system environment is as follows. > > > > model name : Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz > > MemTotal: 2065856 kB > > > > When I tested vanilla, compile time is as follows. > > > > 2433.53user 187.96system 42:05.99elapsed 103%CPU (0avgtext+0avgdata > > 0maxresident)k > > 588752inputs+4503408outputs (127major+55456246minor)pagefaults 0swaps > > > > When I tested your patch, as follows. > > > > 2489.63user 202.41system 44:47.71elapsed 100%CPU (0avgtext+0avgdata > > 0maxresident)k > > 538608inputs+4503928outputs (130major+55531561minor)pagefaults 0swaps > > > > Regresstion almost is above 2 minutes. > > Do you think It is a trivial? > > > > I know your patch is good to allocate hugepage. > > But, I think many users don't need it, including embedded system and > > desktop users yet. > > > > So I suggest you made it enable optionally. > > Hmmm. I would not expect to see any significant impact for this kind of > workload as we should not be triggering capture for the lower order > allocations at all. Something screwey must be occuring. I will go and > reproduce this here and see if I can figure out just what causes this. yup. I also think this is significant regression. if this is reproduced, that patch shouldn't be merged to -mm, IMHO. -- 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