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=-5.3 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,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 8E5B8C433E3 for ; Fri, 14 Aug 2020 17:49:33 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 4353920791 for ; Fri, 14 Aug 2020 17:49:33 +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="wX5OLAhr" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4353920791 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id B8B758D000D; Fri, 14 Aug 2020 13:49:32 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id B14D48D0003; Fri, 14 Aug 2020 13:49:32 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 9B5568D000D; Fri, 14 Aug 2020 13:49:32 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0123.hostedemail.com [216.40.44.123]) by kanga.kvack.org (Postfix) with ESMTP id 8316A8D0003 for ; Fri, 14 Aug 2020 13:49:32 -0400 (EDT) Received: from smtpin24.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 421D1363C for ; Fri, 14 Aug 2020 17:49:32 +0000 (UTC) X-FDA: 77149911384.24.fifth06_411490326ffe Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin24.hostedemail.com (Postfix) with ESMTP id 1AF7F1A4A0 for ; Fri, 14 Aug 2020 17:49:32 +0000 (UTC) X-HE-Tag: fifth06_411490326ffe X-Filterd-Recvd-Size: 3134 Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by imf29.hostedemail.com (Postfix) with ESMTP for ; Fri, 14 Aug 2020 17:49:31 +0000 (UTC) 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; bh=/DWYIQg4Zv/4dhrJ8l+WPqUqcSkig8Oez/noyo1dnB4=; b=wX5OLAhr2OSoH9QZbUG24jPGC2 q4wlQaWlfxXqhzQexWddHurg6E1twmTNkxV8kBEARY96ZUefco+MHSC6kqLq59wMdDJDS0fbeo7GG DzvXRHGRIrBlJ1sj9aXVW7n48MQSoSzEzVOk9+vS10tcO79jiIYym9QbkCiNHEjiBLdAGg2TJyVkI HzVCoW6Jv7dFBdSr8/wnnHLkZMAAA/RBJyzdBubJcnqHeC+mvbMMBG4Oee3sVtVkyUpM0wMaQcy2q ZWBuyyGzYv3fjSTQlJ6LzgwhkZJRQXTXBMdz2o7MMCaNqrryFV/kdYBiB4uq0VEB3vettHGCfC1EF B2jkL/WQ==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=worktop.programming.kicks-ass.net) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1k6dpW-0002jH-Sy; Fri, 14 Aug 2020 17:49:27 +0000 Received: by worktop.programming.kicks-ass.net (Postfix, from userid 1000) id 9CB92980C9E; Fri, 14 Aug 2020 19:49:24 +0200 (CEST) Date: Fri, 14 Aug 2020 19:49:24 +0200 From: Peter Zijlstra To: "Paul E. McKenney" 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: <20200814174924.GI3982@worktop.programming.kicks-ass.net> References: <874kp6llzb.fsf@nanos.tec.linutronix.de> <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> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200814161106.GA13853@paulmck-ThinkPad-P72> User-Agent: Mutt/1.10.1 (2018-07-13) X-Rspamd-Queue-Id: 1AF7F1A4A0 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam01 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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?