From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f48.google.com (mail-pa0-f48.google.com [209.85.220.48]) by kanga.kvack.org (Postfix) with ESMTP id 60CC86B003B for ; Tue, 11 Mar 2014 00:41:50 -0400 (EDT) Received: by mail-pa0-f48.google.com with SMTP id hz1so8278903pad.35 for ; Mon, 10 Mar 2014 21:41:50 -0700 (PDT) Received: from mail.linuxfoundation.org (mail.linuxfoundation.org. [140.211.169.12]) by mx.google.com with ESMTP id m9si18875545pab.32.2014.03.10.21.41.48 for ; Mon, 10 Mar 2014 21:41:49 -0700 (PDT) Date: Mon, 10 Mar 2014 21:46:12 -0700 From: Andrew Morton Subject: Re: bad rss-counter message in 3.14rc5 Message-Id: <20140310214612.3b4de36a.akpm@linux-foundation.org> In-Reply-To: <20140310201340.81994295.akpm@linux-foundation.org> References: <20140305174503.GA16335@redhat.com> <20140305175725.GB16335@redhat.com> <20140307002210.GA26603@redhat.com> <20140311024906.GA9191@redhat.com> <20140310201340.81994295.akpm@linux-foundation.org> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Dave Jones , Linux Kernel , linux-mm@kvack.org, Linus Torvalds , Sasha Levin , Cyrill Gorcunov , Joonsoo Kim , Wanpeng Li , Bob Liu , Konstantin Khlebnikov On Mon, 10 Mar 2014 20:13:40 -0700 Andrew Morton wrote: > > Anyone ? I'm hitting this trace on an almost daily basis, which is a pain > > while trying to reproduce a different bug.. > > Damn, I thought we'd fixed that but it seems not. Cc's added. > > Guys, what stops the migration target page from coming unlocked in > parallel with zap_pte_range()'s call to migration_entry_to_page()? page_table_lock, sort-of. At least, transitions of is_migration_entry() and page_locked() happen under ptl. I don't see any holes in regular migration. Do you know if this is reproducible with CONFIG_NUMA_BALANCING=n or CONFIG_NUMA=n? -- 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