linux-kernel - Re: [PATCH 00/17] Support for read-write lock deadlock detection

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Date:   Mon, 13 May 2019 17:17:35 +0800
From:   Yuyang Du <duyuyang@...il.com>
To:     Peter Zijlstra <peterz@...radead.org>, will.deacon@....com,
        Ingo Molnar <mingo@...nel.org>
Cc:     Bart Van Assche <bvanassche@....org>, ming.lei@...hat.com,
        Frederic Weisbecker <frederic@...nel.org>, tglx@...utronix.de,
        Boqun Feng <boqun.feng@...il.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00/17] Support for read-write lock deadlock detection

Sorry, forgot to mention the patchset is based on my previous small
improvements:

[PATCH v2 00/23] locking/lockdep: Small improvements
(https://lkml.org/lkml/2019/5/6/106).

On Mon, 13 May 2019 at 17:13, Yuyang Du <duyuyang@...il.com> wrote:
>
> Hi Peter and Ingo,
>
> Historically, the read-write locks (recursive-read locks included) are not
> well supported in lockdep. This patchset attempts to solve this problem
> sound and complete.
>
> The bulk of the algorithm is in patch #10, which is actually not complex at
> all. Hopefully, it simply works.
>
> Now that we have read-write locks suppported, we have all the 262 cases
> passed, though I have to flip some cases which, I think, are wrong.
>
> P.S. To Boqun, I haven't got time to read your patchset except that I did
> carefully read your design doc and learnt from it a lot. It is helpful.
> Please give this patchset at least a look.
>
> Thanks,
> Yuyang
>
> --
>
> Yuyang Du (17):
>   locking/lockdep: Add lock type enum to explicitly specify read or
>     write locks
>   locking/lockdep: Add read-write type for dependency
>   locking/lockdep: Add helper functions to operate on the searched path
>   locking/lockdep: Update direct dependency's read-write type if it
>     exists
>   locking/lockdep: Rename deadlock check functions
>   locking/lockdep: Adjust BFS algorithm to support multiple matches
>   locking/lockdep: Introduce mark_lock_unaccessed()
>   locking/lockdep: Introduce chain_hlocks_type for held lock's
>     read-write type
>   locking/lockdep: Hash held lock's read-write type into chain key
>   locking/lockdep: Support read-write lock's deadlock detection
>   locking/lockdep: Adjust lockdep selftest cases
>   locking/lockdep: Remove useless lock type assignment
>   locking/lockdep: Add nest lock type
>   locking/lockdep: Support recursive read locks
>   locking/lockdep: Adjust selftest case for recursive read lock
>   locking/lockdep: Add more lockdep selftest cases
>   locking/lockdep: Remove irq-safe to irq-unsafe read check
>
>  include/linux/lockdep.h            |   40 +-
>  kernel/locking/lockdep.c           |  454 +++++++++++----
>  kernel/locking/lockdep_internals.h |    4 +
>  lib/locking-selftest.c             | 1099 +++++++++++++++++++++++++++++++++++-
>  4 files changed, 1464 insertions(+), 133 deletions(-)
>
> --
> 1.8.3.1
>