From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rik van Riel Subject: Re: [PATCH 8/8] vmscan: Kick flusher threads to clean pages when reclaim is encountering dirty pages Date: Mon, 19 Jul 2010 14:59:36 -0400 Message-ID: <4C44A098.1010806@redhat.com> References: <1279545090-19169-1-git-send-email-mel@csn.ul.ie> <1279545090-19169-9-git-send-email-mel@csn.ul.ie> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, Dave Chinner , Chris Mason , Nick Piggin , Johannes Weiner , Christoph Hellwig , Wu Fengguang , KAMEZAWA Hiroyuki , KOSAKI Motohiro , Andrew Morton , Andrea Arcangeli To: Mel Gorman Return-path: In-Reply-To: <1279545090-19169-9-git-send-email-mel@csn.ul.ie> Sender: owner-linux-mm@kvack.org List-Id: linux-fsdevel.vger.kernel.org On 07/19/2010 09:11 AM, Mel Gorman wrote: > There are a number of cases where pages get cleaned but two of concern > to this patch are; > o When dirtying pages, processes may be throttled to clean pages if > dirty_ratio is not met. > o Pages belonging to inodes dirtied longer than > dirty_writeback_centisecs get cleaned. > > The problem for reclaim is that dirty pages can reach the end of the LRU > if pages are being dirtied slowly so that neither the throttling cleans > them or a flusher thread waking periodically. I can't see a better way to do this without creating a way-too-big-to-merge patch series, and this patch should result in the right behaviour, so ... Acked-by: Rik van Riel -- 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