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=-3.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS 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 1443FC433B4 for ; Fri, 9 Apr 2021 08:25:14 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 3425C61185 for ; Fri, 9 Apr 2021 08:25:13 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3425C61185 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 BE10D6B006E; Fri, 9 Apr 2021 04:25:12 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id B8FF46B0070; Fri, 9 Apr 2021 04:25:12 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A0AED6B0071; Fri, 9 Apr 2021 04:25:12 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0148.hostedemail.com [216.40.44.148]) by kanga.kvack.org (Postfix) with ESMTP id 80CF06B006E for ; Fri, 9 Apr 2021 04:25:12 -0400 (EDT) Received: from smtpin18.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 2FD478248047 for ; Fri, 9 Apr 2021 08:25:12 +0000 (UTC) X-FDA: 78012143664.18.98D0540 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf23.hostedemail.com (Postfix) with ESMTP id 591D3A000390 for ; Fri, 9 Apr 2021 08:25:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.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=202l/8ec2GuA0yYlL8VYlkW1ikC/xFbRwp677ztTmrI=; b=vu0yr3dinpWHKRiVN6tLRNy8Wr e1KRO0UidkfKw1AL875vbYnBHFXCCDgU5flhr/lNEKtITFJ2CHja61VS3EtWNp1f8R94VbSBPO/Z6 tijZcjtdRXmjKBQQemlMfaWCZDwsftTPXsvGrXZPTfFg09UxjtDPuENVT9Nn8Ez0sJuh3O25AXzR8 Ow4soMPjO19XZAKJwaJNbgPx64GvExgNthSBEopQqVd1VSHsQ/JUKiAG0iYdB1pB/HS/bPSlM8mbj N0M7e3lSv8tpoa6YNwA8xlD3QP3JUFeIw+bHZM4Z0gj8UIkZpPkeNgWnpU+xX3eSjuYDIT9C9phBV pxFYZMVg==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.94 #2 (Red Hat Linux)) id 1lUmRF-00034F-US; Fri, 09 Apr 2021 08:24:43 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 145F730001B; Fri, 9 Apr 2021 10:24:25 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id EDC032C232894; Fri, 9 Apr 2021 10:24:24 +0200 (CEST) Date: Fri, 9 Apr 2021 10:24:24 +0200 From: Peter Zijlstra To: Mel Gorman Cc: Linux-MM , Linux-RT-Users , LKML , Chuck Lever , Jesper Dangaard Brouer , Matthew Wilcox , Thomas Gleixner , Ingo Molnar , Michal Hocko , Oscar Salvador Subject: Re: [PATCH 02/11] mm/page_alloc: Convert per-cpu list protection to local_lock Message-ID: References: <20210407202423.16022-1-mgorman@techsingularity.net> <20210407202423.16022-3-mgorman@techsingularity.net> <20210408174244.GG3697@techsingularity.net> <20210409075939.GJ3697@techsingularity.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210409075939.GJ3697@techsingularity.net> X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 591D3A000390 X-Stat-Signature: e3ggafscre8mjoneqgdxubbhx5ohuynw Received-SPF: none (infradead.org>: No applicable sender policy available) receiver=imf23; identity=mailfrom; envelope-from=""; helo=casper.infradead.org; client-ip=90.155.50.34 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1617956710-248547 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, Apr 09, 2021 at 08:59:39AM +0100, Mel Gorman wrote: > In the end I just gave up and kept it simple as there is no benefit to > !PREEMPT_RT which just disables IRQs. Maybe it'll be worth considering when > PREEMPT_RT is upstream and can be enabled. The series was functionally > tested on the PREEMPT_RT tree by reverting the page_alloc.c patch and > applies this series and all of its prerequisites on top. Right, I see the problem. Fair enough; perhaps ammend the changelog to include some of that so that we can 'remember' in a few months why the code is 'funneh'.