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=-13.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_IN_DEF_DKIM_WL 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 3284AC48BCF for ; Sat, 12 Jun 2021 22:49:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0FA9D610C8 for ; Sat, 12 Jun 2021 22:49:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231576AbhFLWvW (ORCPT ); Sat, 12 Jun 2021 18:51:22 -0400 Received: from mail-ej1-f47.google.com ([209.85.218.47]:33306 "EHLO mail-ej1-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231572AbhFLWvU (ORCPT ); Sat, 12 Jun 2021 18:51:20 -0400 Received: by mail-ej1-f47.google.com with SMTP id g20so10124761ejt.0 for ; Sat, 12 Jun 2021 15:49:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=nGHIR4/0sog9+QR1vgYyGt5rSfZQ7hXnNFmBCZsNQSk=; b=lC+cdrowzchkcKAaUtHdUnGc8rpJhhCfEju3TA2/o8CiBKiosvPMgP7QSG9rGrthF/ P4iryOOKpvsyUr9nhZBqZ9D+MUsnU9NDUoTe6q6zdZXxIwv+V4JHcEL3g0h5zefAnYU9 uYkSgVlKtdJKXQGQ9l87vB3tQ8+8f+kgXVfX0ai1cCuqMMPnBlH3afaR9oELkVHB6Cqi q+rQTncUITPSytCVm03VlE8vlSuYkexxAoq/c9uB6VB9hcdT6+DSFm16yTbgRiFjjgpt x0ZBpG90T+cZIoOzntShCWYcInf26H4HbWVJDVr+NuP53d7hggxvDIZkvzsAwcPn/e7N w/8w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=nGHIR4/0sog9+QR1vgYyGt5rSfZQ7hXnNFmBCZsNQSk=; b=L9jFtODFc5DOSuJj6KXhUBiUH7gVIoJ4BFJhHsRRi2HaymiRIJjw6/p5KSEpHp6PWo aktLeT1wP57EzD1XiSfYe2unjbBGlo3l22brMpTF8Ya5PZ1J1IPqaegaP8PTKtOxWa8M hO2dHSLQFJi9fnnv6uV6GLo8pgFifjgXNWwuJCDttxiy6BCUxlIPsep9kxpJTRER8uoo ExBspfYF9vx5EiKZh98m/lhFfjUqXcpF/C5Y/oSZBimvKg0ifa8PpdlbP2LYszsTX7AU sHgKwG+oGf7nafOBJd6uzxtBCzhW9pKkDEERM740oYOrIQowZbvWBWFrQiWqs06RNGZu lIfQ== X-Gm-Message-State: AOAM533ExsfZkgwHeu2ZmQHkCcspzjDnhpZwBKXDEFynAmnFB4il+nwe dQtHMiXe72ZNcIp9QacZgknQSP77q/YBwdbaGiZT X-Google-Smtp-Source: ABdhPJzRAcgO7wzp2G7V21pmftTy6/ICxCnXT86ZVVRZzFnksPSe2C772+v9xZAtsTx/BWDBcpYFkhMyzJ5BmZGcHno= X-Received: by 2002:a17:906:7052:: with SMTP id r18mr9007489ejj.449.1623538087519; Sat, 12 Jun 2021 15:48:07 -0700 (PDT) MIME-Version: 1.0 References: <20210111081821.3041587-1-morbo@google.com> <20210407211704.367039-1-morbo@google.com> <20210612202505.GG68208@worktop.programming.kicks-ass.net> In-Reply-To: From: Bill Wendling Date: Sat, 12 Jun 2021 15:47:56 -0700 Message-ID: Subject: Re: [PATCH v9] pgo: add clang's Profile Guided Optimization infrastructure To: Peter Zijlstra Cc: Kees Cook , Jonathan Corbet , Masahiro Yamada , Linux Doc Mailing List , LKML , Linux Kbuild mailing list , clang-built-linux , Andrew Morton , Nathan Chancellor , Nick Desaulniers , Sami Tolvanen , Fangrui Song , "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org On Sat, Jun 12, 2021 at 1:56 PM Bill Wendling wrote: > On Sat, Jun 12, 2021 at 1:25 PM Peter Zijlstra wrote: > > On Sat, Jun 12, 2021 at 12:10:03PM -0700, Bill Wendling wrote: > > Yes it is, but is that sufficient in this case? It very much isn't for > > KASAN, UBSAN, and a whole host of other instrumentation crud. They all > > needed their own 'bugger-off' attributes. > > > Now, for the "nointr" issue. I'll see if we need an additional change for that. > The GCOV implementation disables profiling in those directories where instrumentation would fail. We do the same. Both clang and gcc seem to treat the no_instrument_function attribute similarly. -bw