Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261208AbUK0N3K (ORCPT ); Sat, 27 Nov 2004 08:29:10 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261209AbUK0N3K (ORCPT ); Sat, 27 Nov 2004 08:29:10 -0500 Received: from parcelfarce.linux.theplanet.co.uk ([195.92.249.252]:61347 "EHLO www.linux.org.uk") by vger.kernel.org with ESMTP id S261208AbUK0N3G (ORCPT ); Sat, 27 Nov 2004 08:29:06 -0500 Date: Sat, 27 Nov 2004 06:19:40 -0200 From: Marcelo Tosatti To: Nikita Danilov Cc: Linux Kernel Mailing List , Andrew Morton , Linux MM Mailing List Subject: Re: [PATCH]: 1/4 batch mark_page_accessed() Message-ID: <20041127081940.GB7740@logos.cnet> References: <16800.47044.75874.56255@gargle.gargle.HOWL> <20041126185833.GA7740@logos.cnet> <16808.23030.312384.635657@gargle.gargle.HOWL> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <16808.23030.312384.635657@gargle.gargle.HOWL> User-Agent: Mutt/1.5.5.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1317 Lines: 31 On Sat, Nov 27, 2004 at 01:41:58PM +0300, Nikita Danilov wrote: > Marcelo Tosatti writes: > > [...] > > > > > Average Half Load -j 4 Run: Average Half Load -j 4 Run: > > Elapsed Time 274.916 Elapsed Time 245.026 > > User Time 833.63 User Time 832.34 > > System Time 73.704 System Time 73.41 > > Percent CPU 335.8 Percent CPU 373.6 > > Context Switches 12984.8 Context Switches 13427.4 > > Sleeps 21459.2 Sleeps 21642 > > What is "System Time" here? Does in include CPU consumption by, say, > kswapd? I dont think "System Time" counts for kswapd - but only time spent inside the kernel, including page reclamation efforts. > If not, then one may conjecture that mark_page_accessed batching > modifies ordering of pages on zone "LRU" lists in a way that measurably > changes efficiency of VM scanning, and mostly affects process that scans > most---kswapd. I agree. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/