Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1764805AbXJZV7Q (ORCPT ); Fri, 26 Oct 2007 17:59:16 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751111AbXJZV7E (ORCPT ); Fri, 26 Oct 2007 17:59:04 -0400 Received: from dvhart.com ([64.146.134.43]:48328 "EHLO dvhart.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750851AbXJZV7D (ORCPT ); Fri, 26 Oct 2007 17:59:03 -0400 Message-ID: <47226325.4000404@mbligh.org> Date: Fri, 26 Oct 2007 14:59:01 -0700 From: Martin Bligh User-Agent: Thunderbird 1.5.0.13 (X11/20070824) MIME-Version: 1.0 To: Rik van Riel Cc: Andrew Morton , marcelo@kvack.org, linux-kernel@vger.kernel.org, drepper@redhat.com, linux-mm@kvack.org Subject: Re: OOM notifications References: <20071018201531.GA5938@dmt> <20071026140201.ae52757c.akpm@linux-foundation.org> <472256AB.6060109@mbligh.org> <20071026141112.18af0fa6.akpm@linux-foundation.org> <20071026173550.333d8eb4@bree.surriel.com> In-Reply-To: <20071026173550.333d8eb4@bree.surriel.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1231 Lines: 29 Rik van Riel wrote: > On Fri, 26 Oct 2007 14:11:12 -0700 > Andrew Morton wrote: > >> Sure, but in terms of high-level userspace interface, being able to >> select() on a group of priority buckets (spread across different >> nodes, zones and cgroups) seems a lot more flexible than any >> signal-based approach we could come up with. > > Absolutely, the process needs to be able to just poll or > select on a file descriptor from the process main loop. > > I am not convinced that the magic of NUMA memory distribution > and NUMA memory pressure should be visible to userspace. Due > to the thundering herd problem we cannot wake up all of the > processes that select on the filedescriptor at the same time > anyway, so we can (later on) add NUMA magic to the process > selection logic in the kernel to only wake up processes on > the right NUMA nodes. > > The initial patch probably does not need that. Depends if you're using cpusets or not, I think? - 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/