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=-5.6 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 4E313C433E3 for ; Fri, 14 Aug 2020 18:02:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 223CB2078D for ; Fri, 14 Aug 2020 18:02:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597428147; bh=ZtFbeBLn03RDB5oZH3Gooo/sJjOAKTmCpMDp7uR0kao=; h=Date:From:To:Cc:Subject:Reply-To:References:In-Reply-To:List-ID: From; b=j0x+ifnKavUgdhpT3AJsu5KRvf9J8lyciH9/B/DDzxzPxDFOwtwfpZ8h0Q/pN7Xlf FoUOD4XNgV2wvMo12qaS8pjj210cfHIgf0plUweMku91mPn5dktmfyUE0RXCWumHUv P6aFGizN8DsDuXGQjIL3V8yQt6Z1zh5mFKt1kLSU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728550AbgHNSC0 (ORCPT ); Fri, 14 Aug 2020 14:02:26 -0400 Received: from mail.kernel.org ([198.145.29.99]:40122 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726596AbgHNSCZ (ORCPT ); Fri, 14 Aug 2020 14:02:25 -0400 Received: from paulmck-ThinkPad-P72.home (unknown [50.45.173.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B482520771; Fri, 14 Aug 2020 18:02:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597428144; bh=ZtFbeBLn03RDB5oZH3Gooo/sJjOAKTmCpMDp7uR0kao=; h=Date:From:To:Cc:Subject:Reply-To:References:In-Reply-To:From; b=w2Slc3ZGErIbvmUQkYgTipC+xLVqw+0CNBnpfh4LGUX0RRa5yjeuH1DkIL811d7b1 zsy1y8zYb0mstf9kw8QvnLXKTIqXooKxQWlMzlNSoGL7UBP4MHv3iNJ/QEN1k1cN/a 7xhXTM3Mi8fg7HXgEEVLf627p3iyqZ7i8KhdxXR8= Received: by paulmck-ThinkPad-P72.home (Postfix, from userid 1000) id 8B3833522A0E; Fri, 14 Aug 2020 11:02:24 -0700 (PDT) Date: Fri, 14 Aug 2020 11:02:24 -0700 From: "Paul E. McKenney" To: Peter Zijlstra Cc: Thomas Gleixner , Michal Hocko , Uladzislau Rezki , LKML , RCU , linux-mm@kvack.org, Andrew Morton , Vlastimil Babka , Matthew Wilcox , "Theodore Y . Ts'o" , Joel Fernandes , Sebastian Andrzej Siewior , Oleksiy Avramchenko Subject: Re: [RFC-PATCH 1/2] mm: Add __GFP_NO_LOCKS flag Message-ID: <20200814180224.GQ4295@paulmck-ThinkPad-P72> Reply-To: paulmck@kernel.org References: <20200813133308.GK9477@dhcp22.suse.cz> <87sgcqty0e.fsf@nanos.tec.linutronix.de> <20200813182618.GX2674@hirez.programming.kicks-ass.net> <20200813185257.GF4295@paulmck-ThinkPad-P72> <20200813220619.GA2674@hirez.programming.kicks-ass.net> <875z9m3xo7.fsf@nanos.tec.linutronix.de> <20200814083037.GD3982@worktop.programming.kicks-ass.net> <20200814141425.GM4295@paulmck-ThinkPad-P72> <20200814161106.GA13853@paulmck-ThinkPad-P72> <20200814174924.GI3982@worktop.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200814174924.GI3982@worktop.programming.kicks-ass.net> User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Aug 14, 2020 at 07:49:24PM +0200, Peter Zijlstra wrote: > On Fri, Aug 14, 2020 at 09:11:06AM -0700, Paul E. McKenney wrote: > > Just to make sure we are talking about the same thing, please see below > > for an untested patch that illustrates how I was interpreting your words. > > Was this what you had in mind? > > No, definitely not. > > Also, since we used to be able to use call_rcu() _everywhere_, including > under zone->lock, how's that working with you calling the > page-allocating from it? Indeed, that is exactly the problem we are trying to solve. Thanx, Paul