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From:   Qian Cai <cai@lca.pw>
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Subject: Re: [PATCH v4 01/10] kcsan: Add Kernel Concurrency Sanitizer infrastructure
Date:   Tue, 19 Nov 2019 16:42:26 -0500
Message-Id: <A74F8151-F5E8-4532-BB67-6CFA32487D26@lca.pw>
References: <CANpmjNPiKg++=QHUjD87dqiBU1pHHfZmGLAh1gOZ+4JKAQ4SAQ@mail.gmail.com>
Cc:     LKMM Maintainers -- Akira Yokosawa <akiyks@gmail.com>,
        Alan Stern <stern@rowland.harvard.edu>,
        Alexander Potapenko <glider@google.com>,
        Andrea Parri <parri.andrea@gmail.com>,
        Andrey Konovalov <andreyknvl@google.com>,
        Andy Lutomirski <luto@kernel.org>,
        Ard Biesheuvel <ard.biesheuvel@linaro.org>,
        Arnd Bergmann <arnd@arndb.de>,
        Boqun Feng <boqun.feng@gmail.com>,
        Borislav Petkov <bp@alien8.de>, Daniel Axtens <dja@axtens.net>,
        Daniel Lustig <dlustig@nvidia.com>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        David Howells <dhowells@redhat.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        "H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
        Jade Alglave <j.alglave@ucl.ac.uk>,
        Joel Fernandes <joel@joelfernandes.org>,
        Jonathan Corbet <corbet@lwn.net>,
        Josh Poimboeuf <jpoimboe@redhat.com>,
        Luc Maranget <luc.maranget@inria.fr>,
        Mark Rutland <Mark.Rutland@arm.com>,
        Nicholas Piggin <npiggin@gmail.com>,
        "Paul E. McKenney" <paulmck@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Will Deacon <will@kernel.org>,
        Eric Dumazet <edumazet@google.com>,
        kasan-dev <kasan-dev@googlegroups.com>,
        linux-arch <linux-arch@vger.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@vger.kernel.org>,
        linux-efi@vger.kernel.org,
        Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Linux Memory Management List <linux-mm@kvack.org>,
        the arch/x86 maintainers <x86@kernel.org>
In-Reply-To: <CANpmjNPiKg++=QHUjD87dqiBU1pHHfZmGLAh1gOZ+4JKAQ4SAQ@mail.gmail.com>
To:     Marco Elver <elver@google.com>
Sender: linux-kernel-owner@vger.kernel.org
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> On Nov 19, 2019, at 2:54 PM, Marco Elver <elver@google.com> 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.=