From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wu Fengguang Subject: Re: [PATCH 8/8] vmscan: Kick flusher threads to clean pages when reclaim is encountering dirty pages Date: Tue, 27 Jul 2010 22:34:23 +0800 Message-ID: <20100727143423.GA5057@localhost> References: <1279545090-19169-1-git-send-email-mel@csn.ul.ie> <1279545090-19169-9-git-send-email-mel@csn.ul.ie> <20100726072832.GB13076@localhost> <20100726092616.GG5300@csn.ul.ie> <20100726112709.GB6284@localhost> <20100726125717.GS5300@csn.ul.ie> <20100726131008.GE11947@localhost> <20100727133513.GZ5300@csn.ul.ie> <20100727142412.GA4771@localhost> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: "linux-kernel@vger.kernel.org" , "linux-fsdevel@vger.kernel.org" , "linux-mm@kvack.org" , Dave Chinner , Chris Mason , Nick Piggin , Rik van Riel , Johannes Weiner , Christoph Hellwig , KAMEZAWA Hiroyuki , KOSAKI Motohiro , Andrew Morton , Andrea Arcangeli To: Mel Gorman Return-path: Content-Disposition: inline In-Reply-To: <20100727142412.GA4771@localhost> Sender: owner-linux-mm@kvack.org List-Id: linux-fsdevel.vger.kernel.org > If you plan to keep wakeup_flusher_threads(), a simpler form may be > sufficient, eg. > > laptop_mode ? 0 : (nr_dirty * 16) This number is not sensitive because the writeback code may well round it up to some more IO efficient value (currently 4MB). AFAIK the nr_pages parameters passed by all existing flusher callers are some rule-of-thumb value, and far from being an exact number. Thanks, Fengguang -- 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