From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail202.messagelabs.com (mail202.messagelabs.com [216.82.254.227]) by kanga.kvack.org (Postfix) with SMTP id 79B986B003D for ; Wed, 29 Apr 2009 03:46:35 -0400 (EDT) Received: by yx-out-1718.google.com with SMTP id 36so574325yxh.26 for ; Wed, 29 Apr 2009 00:47:18 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: <20090428233455.614dcf3a.akpm@linux-foundation.org> References: <20090428090916.GC17038@localhost> <20090428120818.GH22104@mit.edu> <20090429130430.4B11.A69D9226@jp.fujitsu.com> <20090428233455.614dcf3a.akpm@linux-foundation.org> Date: Wed, 29 Apr 2009 16:47:18 +0900 Message-ID: <2f11576a0904290047i1bd8fc6cu7d70a3ac32bf7b5a@mail.gmail.com> Subject: Re: Swappiness vs. mmap() and interactive response From: KOSAKI Motohiro Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Sender: owner-linux-mm@kvack.org To: Andrew Morton Cc: Theodore Tso , Wu Fengguang , Peter Zijlstra , Elladan , linux-kernel@vger.kernel.org, linux-mm , Rik van Riel List-ID: >> Mapped page decrease rapidly: not happend (I guess, these page stay in >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 = =A0 =A0 =A0 active list on my system) >> page fault large latency: =A0 =A0 happend (latencytop display >200ms) > > hm. =A0The last two observations appear to be inconsistent. it mean existing process don't slow down. but new process creation is very = slow. > Elladan, have you checked to see whether the Mapped: number in > /proc/meminfo is decreasing? > >> >> Then, I don't doubt vm replacement logic now. >> but I need more investigate. >> I plan to try following thing today and tommorow. >> >> =A0- XFS >> =A0- LVM >> =A0- another io scheduler (thanks Ted, good view point) >> =A0- Rik's new patch > > It's not clear that we know what's happening yet, is it? =A0It's such a > gross problem that you'd think that even our testing would have found > it by now :( Yes, unclear. but various testing can drill down the reason, I think. > Elladan, do you know if earlier kernels (2.6.26 or thereabouts) had > this severe a problem? > > (notes that we _still_ haven't unbusted prev_priority) -- 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