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 12E36C3815B for ; Mon, 20 Apr 2020 08:27:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E13922078E for ; Mon, 20 Apr 2020 08:27:55 +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="qzb6D4Us" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726061AbgDTI1y (ORCPT ); Mon, 20 Apr 2020 04:27:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49978 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725773AbgDTI1y (ORCPT ); Mon, 20 Apr 2020 04:27:54 -0400 Received: from merlin.infradead.org (unknown [IPv6:2001:8b0:10b:1231::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 50F66C061A0C for ; Mon, 20 Apr 2020 01:27:54 -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=+ihzv2G7gl4wbywFbFfD4kmdeTyXKLjmi41Fi4pfZKE=; b=qzb6D4Usq+oxdkaVPdq/sdGYIj 8zeI7a9lB6gB+lPtJISBLf7QqogLLW8ULuXtzwz1H/KwsZ65Y3IRX8RB4CRtXSMIBdiWro7gaPLMP R0J78KOPR2Fhr+YNmlEOBP7aNfSnzPlk5CVdbTwLLx0BOD5XXswXXRY/arcDGAaxaWF7894991rdQ UJh6NHt1MOs+njcLykTTKmxxQ9n2vIC9bb2zJ2ipaWG2ubKw+9IQ4jlGxskYrWT4GnfzJRTNwQ2rL lo0tJnF/lykXXp33YMowTxb6bxbvYaM4MLYVWjlabaAfau8KEfWC1fOXESB62Z+vlnWfMEQheHwD+ RO/QzI+w==; 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 1jQRm7-00015J-8r; Mon, 20 Apr 2020 08:27:31 +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 7E14E3024EA; Mon, 20 Apr 2020 10:27:28 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 6796A2B8D15BD; Mon, 20 Apr 2020 10:27:28 +0200 (CEST) Date: Mon, 20 Apr 2020 10:27:28 +0200 From: Peter Zijlstra To: Ingo Molnar Cc: Josh Poimboeuf , Linus Torvalds , Thomas Gleixner , Masahiro Yamada , Linux Kernel Mailing List , the arch/x86 maintainers Subject: Re: [GIT pull] perf/urgent for 5.7-rc2 Message-ID: <20200420082728.GA20696@hirez.programming.kicks-ass.net> References: <158730459860.31269.9496277256253823777.tglx@nanos.tec.linutronix.de> <158730460101.31269.5005570498545135614.tglx@nanos.tec.linutronix.de> <20200419200758.3xry3vn2a5caxapx@treble> <20200420074845.GA72554@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200420074845.GA72554@gmail.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Apr 20, 2020 at 09:48:45AM +0200, Ingo Molnar wrote: > Fortunately, much of what objtool does against vmlinux.o can be > parallelized in a rather straightforward fashion I believe, if we build > with -ffunction-sections. So that FGKASLR is going to get us -ffunction-sections, but parallelizing objtool isn't going to be trivial, it's data structures aren't really build for that, esp. decode_instructions() which actively generates data. Still, it's probably doable.