Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752249AbWKGTXF (ORCPT ); Tue, 7 Nov 2006 14:23:05 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752190AbWKGTXF (ORCPT ); Tue, 7 Nov 2006 14:23:05 -0500 Received: from omx2-ext.sgi.com ([192.48.171.19]:40927 "EHLO omx2.sgi.com") by vger.kernel.org with ESMTP id S1751798AbWKGTXC (ORCPT ); Tue, 7 Nov 2006 14:23:02 -0500 Date: Tue, 7 Nov 2006 11:22:49 -0800 (PST) From: Christoph Lameter To: "Siddha, Suresh B" cc: Ingo Molnar , akpm@osdl.org, mm-commits@vger.kernel.org, nickpiggin@yahoo.com.au, linux-kernel@vger.kernel.org Subject: Re: + sched-use-tasklet-to-call-balancing.patch added to -mm tree In-Reply-To: <20061107095049.B3262@unix-os.sc.intel.com> Message-ID: References: <200611032205.kA3M5wmJ003178@shell0.pdx.osdl.net> <20061107073248.GB5148@elte.hu> <20061107093112.A3262@unix-os.sc.intel.com> <20061107095049.B3262@unix-os.sc.intel.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 804 Lines: 18 On Tue, 7 Nov 2006, Siddha, Suresh B wrote: > tasklet_schedule doesn't schedule if there is already one scheduled. Correct. The effect of this is to only allow load balancing on one cpu at a time. Subsequent attempts to schedule load balancing on other cpus are ignored until the cpu that is load balancing has finished. Then the others (hopefully) get a turn. A pretty interesting unintended effect. It certainly solves the concurrent load balancing scalability issues and would avoid the need to stagger load balancing. Wonder how fair it would be? - 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/