From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail190.messagelabs.com (mail190.messagelabs.com [216.82.249.51]) by kanga.kvack.org (Postfix) with ESMTP id 16A706B0022 for ; Mon, 2 May 2011 19:44:41 -0400 (EDT) Date: Mon, 2 May 2011 16:44:30 -0700 From: Andrew Morton Subject: Re: mmotm 2011-04-29 - wonky VmRSS and VmHWM values after swapping Message-Id: <20110502164430.eb7d451d.akpm@linux-foundation.org> In-Reply-To: <8185.1304347042@localhost> References: <201104300002.p3U02Ma2026266@imap1.linux-foundation.org> <49683.1304296014@localhost> <8185.1304347042@localhost> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Valdis.Kletnieks@vt.edu Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Peter Zijlstra On Mon, 02 May 2011 10:37:22 -0400 Valdis.Kletnieks@vt.edu wrote: > On Sun, 01 May 2011 20:26:54 EDT, Valdis.Kletnieks@vt.edu said: > > On Fri, 29 Apr 2011 16:26:16 PDT, akpm@linux-foundation.org said: > > > The mm-of-the-moment snapshot 2011-04-29-16-25 has been uploaded to > > > > > > http://userweb.kernel.org/~akpm/mmotm/ > > > > Dell Latitude E6500 laptop, Core2 Due P8700, 4G RAM, 2G swap.Z86_64 kernel. > > > > I was running a backup of the system to an external USB hard drive. > > Is a red herring. Am seeing it again, after only 20 minutes of uptime, and so > far I've only gotten 1.2G or so into the 4G ram (2.5G still free), and never > touched swap yet. > > Aha! I have a reproducer (found while composing this note). /bin/su will > reliably trigger it (4 tries out of 4, launching from a bash shell that itself > has sane VmRSS and VmHWM values). So it's a specific code sequence doing it > (probably one syscall doing something quirky). > > Now if I could figure out how to make strace look at the VmRSS after each > syscall, or get gdb to do similar. Any suggestions? Am open to perf/other > solutions as well, if anybody has one handy... > hm, me too. After boot, hald has a get_mm_counter(mm, MM_ANONPAGES) of 0xffffffffffff3c27. Bisected to Pater's mm-extended-batches-for-generic-mmu_gather.patch, can't see how it did that. -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org