From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.2 required=3.0 tests=DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,T_DKIM_INVALID, USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2AEDEC433F5 for ; Fri, 31 Aug 2018 11:26:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C8E6020661 for ; Fri, 31 Aug 2018 11:26:57 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="dwuEN31p" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C8E6020661 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728163AbeHaPd5 (ORCPT ); Fri, 31 Aug 2018 11:33:57 -0400 Received: from merlin.infradead.org ([205.233.59.134]:46690 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726990AbeHaPd5 (ORCPT ); Fri, 31 Aug 2018 11:33:57 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=4YcPXXdMlNcUy0GqoD+GK/qSAmubC4Hdyy5Lf0UA5Wk=; b=dwuEN31p42wJCGFw0S17V4sdv Sf+JQenU6KcXZDeUWUeQEPGzEUq2uWEXpB+a92kZDTdSu3bgFttSGEkSTmclQXyIpQ837nGEwU+I8 cOkZAXMyXj7Mh/og4CzWaocVNMTurZqSqv3g60mGzw1UVihZaJ8UDK9wcPgkmWhBpcU99YqeRYzvE 3doJdqLDjqpGfcgiEgWwGng7ZoWVuUIt/+pZ6JyL+VhJpUum5UnuDgmKgThgb4OmTbXQGjhMOLjfp xR39QfPTUkDVnQ/7oeinlvQDjz6urJU/crUJ2MslJHa2jmdjX9X4VlzN65cKra8qvZXW397TWt1tp ks5AQtDxA==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=hirez.programming.kicks-ass.net) by merlin.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1fvhZY-0006fH-P5; Fri, 31 Aug 2018 11:26:41 +0000 Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 399B32024D730; Fri, 31 Aug 2018 13:26:39 +0200 (CEST) Date: Fri, 31 Aug 2018 13:26:39 +0200 From: Peter Zijlstra To: Srikar Dronamraju Cc: Ingo Molnar , LKML , Mel Gorman , Rik van Riel , Thomas Gleixner , Michael Ellerman , Heiko Carstens , Suravee Suthikulpanit , linuxppc-dev , Benjamin Herrenschmidt Subject: Re: [PATCH 2/2] sched/topology: Expose numa_mask set/clear functions to arch Message-ID: <20180831112639.GA24142@hirez.programming.kicks-ass.net> References: <20180808081942.GA37418@linux.vnet.ibm.com> <1533920419-17410-1-git-send-email-srikar@linux.vnet.ibm.com> <1533920419-17410-2-git-send-email-srikar@linux.vnet.ibm.com> <20180829080219.GN24124@hirez.programming.kicks-ass.net> <20180831102724.GB8437@linux.vnet.ibm.com> <20180831111253.GJ24124@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180831111253.GJ24124@hirez.programming.kicks-ass.net> User-Agent: Mutt/1.10.0 (2018-05-17) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Aug 31, 2018 at 01:12:53PM +0200, Peter Zijlstra wrote: > NAK, not until you've fixed every cpu_to_node() user in the kernel to > deal with that mask changing. Also, what happens if userspace reads that information; uses libnuma and then you go and shift the world underneath their feet? > This is absolutely insane.