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[2620:137:e000::3:6]) by mx.google.com with ESMTPS id rm12-20020a17090b3ecc00b00277651787f1si10405866pjb.145.2023.10.09.04.46.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Oct 2023 04:46:21 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:6 as permitted sender) client-ip=2620:137:e000::3:6; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:6 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by pete.vger.email (Postfix) with ESMTP id 496828060CA5; Mon, 9 Oct 2023 04:46:19 -0700 (PDT) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.10 at pete.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346299AbjJILqG convert rfc822-to-8bit (ORCPT + 99 others); Mon, 9 Oct 2023 07:46:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42994 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346306AbjJILqD (ORCPT ); Mon, 9 Oct 2023 07:46:03 -0400 Received: from outpost1.zedat.fu-berlin.de (outpost1.zedat.fu-berlin.de [130.133.4.66]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CB14DDE; Mon, 9 Oct 2023 04:46:00 -0700 (PDT) Received: from inpost2.zedat.fu-berlin.de ([130.133.4.69]) by outpost.zedat.fu-berlin.de (Exim 4.95) with esmtps (TLS1.3) tls TLS_AES_256_GCM_SHA384 (envelope-from ) id 1qpohe-000uNi-LJ; Mon, 09 Oct 2023 13:45:38 +0200 Received: from p5b13aee9.dip0.t-ipconnect.de ([91.19.174.233] helo=[192.168.178.81]) by inpost2.zedat.fu-berlin.de (Exim 4.95) with esmtpsa (TLS1.3) tls TLS_AES_256_GCM_SHA384 (envelope-from ) id 1qpohe-000QOe-CA; Mon, 09 Oct 2023 13:45:38 +0200 Message-ID: <61d3b62380fb78b87003a09cc08827fb28de7942.camel@physik.fu-berlin.de> Subject: Re: [PATCH/RFC] m68k: Add full preempt support From: John Paul Adrian Glaubitz To: Geert Uytterhoeven , Greg Ungerer , Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Thomas Gleixner , Matthew Wilcox Cc: linux-m68k@lists.linux-m68k.org, linux-kernel@vger.kernel.org Date: Mon, 09 Oct 2023 13:45:37 +0200 In-Reply-To: References: <7858a184cda66e0991fd295c711dfed7e4d1248c.1696603287.git.geert@linux-m68k.org> Autocrypt: addr=glaubitz@physik.fu-berlin.de; 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charset="UTF-8" Content-Transfer-Encoding: 8BIT User-Agent: Evolution 3.50.0 MIME-Version: 1.0 X-Original-Sender: glaubitz@physik.fu-berlin.de X-Originating-IP: 91.19.174.233 X-ZEDAT-Hint: PO X-Spam-Status: No, score=2.8 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_SBL_CSS,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on pete.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (pete.vger.email [0.0.0.0]); Mon, 09 Oct 2023 04:46:19 -0700 (PDT) X-Spam-Level: ** Hi Geert! On Mon, 2023-10-09 at 13:29 +0200, Geert Uytterhoeven wrote: > On Fri, Oct 6, 2023 at 4:49 PM Geert Uytterhoeven wrote: > > Currently, a Preemptible Kernel is only supported on the Coldfire CPU > > family. Extend preempt support to the full Classic M68K CPU family > > (68020+ with MMU, and 68000-derivatives without MMU). > > > > Make sure preemption is disabled in loops involving cache and TLB > > flushing. > > > > Signed-off-by: Geert Uytterhoeven > > --- > > Tested on ARAnyM, using none/voluntary/full preemption. > > bloat-o-meter summaries for atari_defconfig: > > PREEMPT_NONE -> PREEMPT_VOLUNTARY: > > add/remove: 0/0 grow/shrink: 238/30 up/down: 2804/-748 (2056) > Total: Before=4478149, After=4480205, chg +0.05% > > PREEMPT_VOLUNTARY -> PREEMPT: > > add/remove: 735/277 grow/shrink: 3050/347 up/down: 244359/-11440 (232919) > Total: Before=4480205, After=4713124, chg +5.20% > > Ouch. What exactly does the change document? More scheduling events? Adrian -- .''`. John Paul Adrian Glaubitz : :' : Debian Developer `. `' Physicist `- GPG: 62FF 8A75 84E0 2956 9546 0006 7426 3B37 F5B5 F913