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=-3.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED 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 136B1C433DF for ; Thu, 9 Jul 2020 10:33:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E17A0206DF for ; Thu, 9 Jul 2020 10:33:49 +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="ysIolg+C" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726482AbgGIKds (ORCPT ); Thu, 9 Jul 2020 06:33:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38382 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726357AbgGIKdr (ORCPT ); Thu, 9 Jul 2020 06:33:47 -0400 Received: from merlin.infradead.org (merlin.infradead.org [IPv6:2001:8b0:10b:1231::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 917A5C061A0B; Thu, 9 Jul 2020 03:33:47 -0700 (PDT) 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=IvpXUYK9H+QnmAsI+N7Y+NJkZMFkfZkklbiU2ToyVQs=; b=ysIolg+CeRhNjk4NEZhTj9mj5g ca828lNtjuaGV9NHITlG2ZDPtxGhXNhk3KrvudsXjUJmb8J4XG/OF1nzUOwI//gHDtqE0EANnpbE+ bbiBnPXo5VHSiHumhpr2Qu+akcJEqpES74jCyTShVPKFLAmD/sBzeRgZb/ORaBfu5DUyt8R+5OLWf GfezKgB7POj5RVO9xyLQJYa4YqvWXnYTcjZguHbo5tiN+wTk/yxkJo9dnoBBMvOLBeJh/GXmNplaB k6UuaBO7U4dpxgXLgt+GyuZ9p/eO25EDL03UeJAkSn2ViIUTHUSjhhYACWMO+fCLOzes7hYXYC/zl 7sbP7/LA==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1jtTs4-0007rF-9q; Thu, 09 Jul 2020 10:33:40 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 66F76300739; Thu, 9 Jul 2020 12:33:38 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 53455235B3D17; Thu, 9 Jul 2020 12:33:38 +0200 (CEST) Date: Thu, 9 Jul 2020 12:33:38 +0200 From: Peter Zijlstra To: Michael Ellerman Cc: Nicholas Piggin , linuxppc-dev@lists.ozlabs.org, Will Deacon , Boqun Feng , Ingo Molnar , Waiman Long , Anton Blanchard , linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, kvm-ppc@vger.kernel.org, linux-arch@vger.kernel.org Subject: Re: [PATCH v3 4/6] powerpc/64s: implement queued spinlocks and rwlocks Message-ID: <20200709103338.GQ597537@hirez.programming.kicks-ass.net> References: <20200706043540.1563616-1-npiggin@gmail.com> <20200706043540.1563616-5-npiggin@gmail.com> <877dvdvvkm.fsf@mpe.ellerman.id.au> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <877dvdvvkm.fsf@mpe.ellerman.id.au> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jul 09, 2020 at 08:20:25PM +1000, Michael Ellerman wrote: > Nicholas Piggin writes: > > These have shown significantly improved performance and fairness when > > spinlock contention is moderate to high on very large systems. > > > > [ Numbers hopefully forthcoming after more testing, but initial > > results look good ] > > Would be good to have something here, even if it's preliminary. > > > Thanks to the fast path, single threaded performance is not noticably > > hurt. > > > > Signed-off-by: Nicholas Piggin > > --- > > arch/powerpc/Kconfig | 13 ++++++++++++ > > arch/powerpc/include/asm/Kbuild | 2 ++ > > arch/powerpc/include/asm/qspinlock.h | 25 +++++++++++++++++++++++ > > arch/powerpc/include/asm/spinlock.h | 5 +++++ > > arch/powerpc/include/asm/spinlock_types.h | 5 +++++ > > arch/powerpc/lib/Makefile | 3 +++ > > > include/asm-generic/qspinlock.h | 2 ++ > > Who's ack do we need for that part? Mine I suppose would do, as discussed earlier, it probably isn't required anymore, but I understand the paranoia of not wanting to change too many things at once :-) Acked-by: Peter Zijlstra (Intel)