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=-0.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,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 7187EC43141 for ; Tue, 19 Nov 2019 21:42:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3E4602245C for ; Tue, 19 Nov 2019 21:42:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lca.pw header.i=@lca.pw header.b="fwZ3JQdG" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727233AbfKSVma (ORCPT ); Tue, 19 Nov 2019 16:42:30 -0500 Received: from mail-qk1-f193.google.com ([209.85.222.193]:42033 "EHLO mail-qk1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726911AbfKSVma (ORCPT ); Tue, 19 Nov 2019 16:42:30 -0500 Received: by mail-qk1-f193.google.com with SMTP id i3so7361621qkk.9 for ; Tue, 19 Nov 2019 13:42:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=lca.pw; s=google; h=content-transfer-encoding:from:mime-version:subject:date:message-id :references:cc:in-reply-to:to; bh=QB4SUVhpavfDd836jssG/dIvVknUQvs1rkhBHGx6mVo=; b=fwZ3JQdGRF+MfMR4OTzPIKz33coTxmwMczqTMp1zgcU9vBAQTT49Lyi3EpmBIp0wef tEJMyTvj/+RtuA+1K3IwMfEffYlP0HdS6jLuAz7BTerdJIY9GJv85HfAQbejgurnaa+u /0nJrzt2D6JSFpTwCmgUpVRtXuqYqgQeNUf8MHJbI3dP3j8mZ+rEN0+j0vXnPZdrQxbB quT+m7nIBvcr0OjrzLU6dymwzmcC38CLbEWcGNsxP//LhERqt+Vw2RttXu28w3xfTwvB CmTZuar9342FqqskXbUVB1Aqc7zvW1kcHcEW/fxdHi5CzWuDjWWnBpcJbAWZwrTAHMnD M/hQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:content-transfer-encoding:from:mime-version :subject:date:message-id:references:cc:in-reply-to:to; bh=QB4SUVhpavfDd836jssG/dIvVknUQvs1rkhBHGx6mVo=; b=X0RXQl87e0KKWZQxs2TGqrD1+hMJeBzDoaXjyFv/ovUlabXpcDJkC7knJzUglwNina 0SPv0yIZU8+ZwQrLbwZ5JXVAZ+0wp2fCKfoGlWCTne25MQM/uRsRIflxMCSWmKKkv1lR 4Y+ATRNe85kgF97Iavl+67WWyVuaxG2q6CM+XYKW1COhP89m6wPG1pkF8CPSLr0ryd4I 0pkOudTp91rThWVox3WMVKPz+R2kiXFaJiBuAafNlqOgvPENVuboj+Vo//f052pr6jpx dt8HnNTHbK4GQG1dAam25GQgRbpcQPAJa86TJor/JChToYp7lDaxh9YldNjJmY5VEmfC dEpw== X-Gm-Message-State: APjAAAUTeDpFiroQ5uSv7kcgR8tMoysFkH7pPEIUBbA5frfEhSxKhhEE PjugLTCmzyQkjg1yRCnqxeWTIQ== X-Google-Smtp-Source: APXvYqx8mO+d9bo/Rcv0JrlRBZEW7R40QjO+mH4aDpl24EGipM45Jni5and68zWWOZCWwJw0gPvq9A== X-Received: by 2002:a37:6517:: with SMTP id z23mr32008271qkb.434.1574199749166; Tue, 19 Nov 2019 13:42:29 -0800 (PST) Received: from ?IPv6:2600:1000:b079:1710:3c3b:2ce9:9489:b502? ([2600:1000:b079:1710:3c3b:2ce9:9489:b502]) by smtp.gmail.com with ESMTPSA id a19sm13439465qtk.56.2019.11.19.13.42.27 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 19 Nov 2019 13:42:28 -0800 (PST) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable From: Qian Cai Mime-Version: 1.0 (1.0) Subject: Re: [PATCH v4 01/10] kcsan: Add Kernel Concurrency Sanitizer infrastructure Date: Tue, 19 Nov 2019 16:42:26 -0500 Message-Id: References: Cc: LKMM Maintainers -- Akira Yokosawa , Alan Stern , Alexander Potapenko , Andrea Parri , Andrey Konovalov , Andy Lutomirski , Ard Biesheuvel , Arnd Bergmann , Boqun Feng , Borislav Petkov , Daniel Axtens , Daniel Lustig , Dave Hansen , David Howells , Dmitry Vyukov , "H. Peter Anvin" , Ingo Molnar , Jade Alglave , Joel Fernandes , Jonathan Corbet , Josh Poimboeuf , Luc Maranget , Mark Rutland , Nicholas Piggin , "Paul E. McKenney" , Peter Zijlstra , Thomas Gleixner , Will Deacon , Eric Dumazet , kasan-dev , linux-arch , "open list:DOCUMENTATION" , linux-efi@vger.kernel.org, Linux Kbuild mailing list , LKML , Linux Memory Management List , the arch/x86 maintainers In-Reply-To: To: Marco Elver X-Mailer: iPhone Mail (17A878) Sender: linux-efi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-efi@vger.kernel.org Archived-At: List-Archive: List-Post: > On Nov 19, 2019, at 2:54 PM, Marco Elver wrote: >=20 > Regardless of approach, my guess is that the complexity outweighs any > benefits this may provide in the end. Not only would a hypothetical > kernel that combines these be extremely slow, it'd also diminish the > practical value because testing and finding bugs would also be > impaired due to performance. On the other hand, it is valuable for distros to be able to select both for t= he debug kernel variant. Performance is usually not a major concern over the= re and could be migrated by other means like selecting powerful systems etc.=