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=-0.6 required=3.0 tests=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 0F8CFC433E0 for ; Thu, 9 Jul 2020 08:31:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D01FE2074B for ; Thu, 9 Jul 2020 08:31:34 +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="F0s0r0RG" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726352AbgGIIbc (ORCPT ); Thu, 9 Jul 2020 04:31:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47670 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726151AbgGIIb2 (ORCPT ); Thu, 9 Jul 2020 04:31:28 -0400 Received: from merlin.infradead.org (merlin.infradead.org [IPv6:2001:8b0:10b:1231::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6457AC061A0B; Thu, 9 Jul 2020 01:31:28 -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=2u6IXv0WvuYmLy64Ol8ToLNhgDQTw8a7diWyD8qQt08=; b=F0s0r0RGrn5TfKzoVnYXlTKpg+ KGNajxhzv6v7lQl2vblqcIsoUZOfS0vFJigwA3e9/RP28IYSY/w/fMOqFWMDqdBjISV03OsTlM8hu LZqsSCgVytkRYh5ISkCcBLr4Le1Nh2Ql7PK1dzZdVgSQAlgUSnSTvqEkqAHfaeJXFaWg+DTGddS1c 4rKztouBM+OG3AGJvLZScssnBagjrXd+I0tpCAUr7QuU+cpcf+lja0j1YbFdUWenzhQa1pfrdaTlJ sGnWvmh+F87Ou5hBRP3Mbqxb15xqCM+gQyE5R0kCel3LAyVegAqk0RpHYPBIsqc2Un1Oji38WRzKa ybx7cLnw==; 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 1jtRxb-00026c-Cs; Thu, 09 Jul 2020 08:31:15 +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 BD0133013E5; Thu, 9 Jul 2020 10:31:13 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id A7C6C29E916A5; Thu, 9 Jul 2020 10:31:13 +0200 (CEST) Date: Thu, 9 Jul 2020 10:31:13 +0200 From: Peter Zijlstra To: Waiman Long Cc: Nicholas Piggin , linuxppc-dev@lists.ozlabs.org, Anton Blanchard , Boqun Feng , kvm-ppc@vger.kernel.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, Ingo Molnar , virtualization@lists.linux-foundation.org, Will Deacon Subject: Re: [PATCH v3 0/6] powerpc: queued spinlocks and rwlocks Message-ID: <20200709083113.GI597537@hirez.programming.kicks-ass.net> References: <20200706043540.1563616-1-npiggin@gmail.com> <24f75d2c-60cd-2766-4aab-1a3b1c80646e@redhat.com> <1594101082.hfq9x5yact.astroid@bobo.none> <20200708084106.GE597537@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jul 08, 2020 at 07:54:34PM -0400, Waiman Long wrote: > On 7/8/20 4:41 AM, Peter Zijlstra wrote: > > On Tue, Jul 07, 2020 at 03:57:06PM +1000, Nicholas Piggin wrote: > > > Yes, powerpc could certainly get more performance out of the slow > > > paths, and then there are a few parameters to tune. > > Can you clarify? The slow path is already in use on ARM64 which is weak, > > so I doubt there's superfluous serialization present. And Will spend a > > fair amount of time on making that thing guarantee forward progressm, so > > there just isn't too much room to play. > > > > > We don't have a good alternate patching for function calls yet, but > > > that would be something to do for native vs pv. > > Going by your jump_label implementation, support for static_call should > > be fairly straight forward too, no? > > > > https://lkml.kernel.org/r/20200624153024.794671356@infradead.org > > > Speaking of static_call, I am also looking forward to it. Do you have an > idea when that will be merged? 0day had one crash on the last round, I think Steve send a fix for that last night and I'll go look at it. That said, the last posting got 0 feedback, so either everybody is really happy with it, or not interested. So let us know in the thread, with some review feedback. Once I get through enough of the inbox to actually find the fix and test it, I'll also update the thread, and maybe threaten to merge it if everybody stays silent :-)