From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wi0-f171.google.com (mail-wi0-f171.google.com [209.85.212.171]) by kanga.kvack.org (Postfix) with ESMTP id AC9926B00E0 for ; Tue, 6 Jan 2015 12:55:01 -0500 (EST) Received: by mail-wi0-f171.google.com with SMTP id bs8so5857912wib.10 for ; Tue, 06 Jan 2015 09:55:01 -0800 (PST) Received: from mx1.redhat.com (mx1.redhat.com. [209.132.183.28]) by mx.google.com with ESMTPS id eh3si16600610wib.85.2015.01.06.09.54.59 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 06 Jan 2015 09:55:00 -0800 (PST) Date: Tue, 6 Jan 2015 12:54:43 -0500 (EST) From: Mikulas Patocka Subject: Re: Dirty pages underflow on 3.14.23 In-Reply-To: <20150106150250.GA26895@phnom.home.cmpxchg.org> Message-ID: References: <20150106150250.GA26895@phnom.home.cmpxchg.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org List-ID: To: Johannes Weiner Cc: Vlastimil Babka , Leon Romanovsky , Mel Gorman , Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org On Tue, 6 Jan 2015, Johannes Weiner wrote: > > The bug probably happened during git pull or apt-get update, though one > > can't be sure that these commands caused it. > > > > I see that 3.14.24 containes some fix for underflow (commit > > 6619741f17f541113a02c30f22a9ca22e32c9546, upstream commit > > abe5f972912d086c080be4bde67750630b6fb38b), but it doesn't seem that that > > commit fixes this condition. If you have a commit that could fix this, say > > it. > > That's an unrelated counter, but there is a known dirty underflow > problem that was addressed in 87a7e00b206a ("mm: protect > set_page_dirty() from ongoing truncation"). It should make it into > the stable kernels in the near future. Can you reproduce this issue? > > Thanks, > Johannes I can't reprodce it. It happened just once. That patch is supposed to fix an occasional underflow by a single page - while my meminfo showed underflow by 22952KiB (5738 pages). Mikulas -- 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