Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263100AbUKTD75 (ORCPT ); Fri, 19 Nov 2004 22:59:57 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263101AbUKTD6T (ORCPT ); Fri, 19 Nov 2004 22:58:19 -0500 Received: from holomorphy.com ([207.189.100.168]:38273 "EHLO holomorphy.com") by vger.kernel.org with ESMTP id S263120AbUKTDzS (ORCPT ); Fri, 19 Nov 2004 22:55:18 -0500 Date: Fri, 19 Nov 2004 19:55:10 -0800 From: William Lee Irwin III To: Nick Piggin Cc: Linus Torvalds , Christoph Lameter , akpm@osdl.org, Benjamin Herrenschmidt , Hugh Dickins , linux-mm@kvack.org, linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: page fault scalability patch V11 [0/7]: overview Message-ID: <20041120035510.GH2714@holomorphy.com> References: <419D581F.2080302@yahoo.com.au> <419D5E09.20805@yahoo.com.au> <1100848068.25520.49.camel@gaston> <20041120020306.GA2714@holomorphy.com> <419EBBE0.4010303@yahoo.com.au> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <419EBBE0.4010303@yahoo.com.au> Organization: The Domain of Holomorphy User-Agent: Mutt/1.5.6+20040722i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 905 Lines: 22 William Lee Irwin III wrote: >> Unprivileged triggers for full-tasklist scans are NMI oops material. On Sat, Nov 20, 2004 at 02:37:04PM +1100, Nick Piggin wrote: > Hang on, let's come back to this... > We already have unprivileged do-for-each-thread triggers in the proc > code. It's in do_task_stat, even. Rss reporting would basically just > involve one extra addition within that loop. > So... hmm, I can't see a problem with it. /proc/ triggering NMI oopses was a persistent problem even before that code was merged. I've not bothered testing it as it at best aggravates it. And thread groups can share mm's. do_for_each_thread() won't suffice. -- wli - 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/