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From: Marco Elver <elver@google.com>
To: Qian Cai <cai@lca.pw>
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>,
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	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>,
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Subject: Re: [PATCH v4 01/10] kcsan: Add Kernel Concurrency Sanitizer infrastructure
Date: Tue, 19 Nov 2019 22:53:48 +0100
Message-ID: <CANpmjNOJdWi6i+2Nn70UQDvF0a0pQTVVye7CTTJgqOHa3UmHMQ@mail.gmail.com> (raw)
In-Reply-To: <A74F8151-F5E8-4532-BB67-6CFA32487D26@lca.pw>

On Tue, 19 Nov 2019 at 22:42, Qian Cai <cai@lca.pw> wrote:
>
>
>
> > On Nov 19, 2019, at 2:54 PM, Marco Elver <elver@google.com> wrote:
> >
> > 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 the debug kernel variant. Performance is usually not a major concern over there and could be migrated by other means like selecting powerful systems etc.

Fair enough. However, right now none of gcc nor clang would support
this. It is something to revisit in future, but is certainly not
something that can trivially be resolved.

Thanks,
-- Marco

  reply index

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-14 18:02 [PATCH v4 00/10] Add Kernel Concurrency Sanitizer (KCSAN) Marco Elver
2019-11-14 18:02 ` [PATCH v4 01/10] kcsan: Add Kernel Concurrency Sanitizer infrastructure Marco Elver
2019-11-19 19:27   ` Qian Cai
2019-11-19 19:54     ` Marco Elver
2019-11-19 21:42       ` Qian Cai
2019-11-19 21:53         ` Marco Elver [this message]
2020-01-03  5:13   ` Qian Cai
2020-01-06 12:46     ` Marco Elver
2020-01-14 11:08       ` Qian Cai
2020-01-14 12:51         ` Marco Elver
2020-01-14 19:22         ` Paul E. McKenney
2020-01-14 20:30           ` Qian Cai
2020-01-14 21:34             ` Paul E. McKenney
2020-01-14 21:48               ` Qian Cai
2020-01-14 22:09                 ` Paul E. McKenney
2019-11-14 18:02 ` [PATCH v4 02/10] include/linux/compiler.h: Introduce data_race(expr) macro Marco Elver
2019-11-14 18:02 ` [PATCH v4 03/10] kcsan: Add Documentation entry in dev-tools Marco Elver
2019-11-14 18:02 ` [PATCH v4 04/10] objtool, kcsan: Add KCSAN runtime functions to whitelist Marco Elver
2019-11-14 18:02 ` [PATCH v4 05/10] build, kcsan: Add KCSAN build exceptions Marco Elver
2019-11-14 18:02 ` [PATCH v4 06/10] seqlock, kcsan: Add annotations for KCSAN Marco Elver
2019-11-14 18:03 ` [PATCH v4 07/10] seqlock: Require WRITE_ONCE surrounding raw_seqcount_barrier Marco Elver
2019-11-14 18:03 ` [PATCH v4 08/10] asm-generic, kcsan: Add KCSAN instrumentation for bitops Marco Elver
2019-11-15 11:55   ` Marco Elver
2019-11-14 18:03 ` [PATCH v4 09/10] locking/atomics, kcsan: Add KCSAN instrumentation Marco Elver
2019-11-14 18:03 ` [PATCH v4 10/10] x86, kcsan: Enable KCSAN for x86 Marco Elver
2019-11-14 19:50 ` [PATCH v4 00/10] Add Kernel Concurrency Sanitizer (KCSAN) Paul E. McKenney
2019-11-14 21:33   ` Marco Elver
2019-11-14 22:15     ` Paul E. McKenney
2019-11-15 12:02       ` Marco Elver
2019-11-15 16:41         ` Paul E. McKenney
2019-11-15 17:14           ` Marco Elver
2019-11-15 20:43             ` Paul E. McKenney
2019-11-16  8:20               ` Marco Elver
2019-11-16 15:34                 ` Paul E. McKenney
2019-11-16 18:09                   ` Marco Elver
2019-11-16 18:28                     ` Paul E. McKenney
2019-11-19 19:50 ` Qian Cai
2019-11-19 20:12 ` Qian Cai
2019-11-19 21:50   ` Marco Elver
2019-11-20 15:54     ` Marco Elver

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