From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753029AbaAXWaK (ORCPT ); Fri, 24 Jan 2014 17:30:10 -0500 Received: from mail.linuxfoundation.org ([140.211.169.12]:45344 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752290AbaAXWaF (ORCPT ); Fri, 24 Jan 2014 17:30:05 -0500 Date: Fri, 24 Jan 2014 14:30:03 -0800 From: Andrew Morton To: Johannes Weiner Cc: Tejun Heo , Rik van Riel , Mel Gorman , linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [patch 0/2] mm: reduce reclaim stalls with heavy anon and dirty cache Message-Id: <20140124143003.2629e9c2c8c2595e805c8c25@linux-foundation.org> In-Reply-To: <1390600984-13925-1-git-send-email-hannes@cmpxchg.org> References: <1390600984-13925-1-git-send-email-hannes@cmpxchg.org> X-Mailer: Sylpheed 3.2.0beta5 (GTK+ 2.24.10; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 24 Jan 2014 17:03:02 -0500 Johannes Weiner wrote: > Tejun reported stuttering and latency spikes on a system where random > tasks would enter direct reclaim and get stuck on dirty pages. Around > 50% of memory was occupied by tmpfs backed by an SSD, and another disk > (rotating) was reading and writing at max speed to shrink a partition. Do you think this is serious enough to squeeze these into 3.14?