linux-kernel - Re: [PATCH v3 00/30] Support recursive-read lock deadlock detection

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Message-ID: <CAHttsrav5WLV5cmhE9z=61TZHrQHTtpPDtu=RpjMLGzZ8S9Jqg@mail.gmail.com>
Date:   Wed, 10 Jul 2019 09:54:44 +0800
From:   Yuyang Du <duyuyang@...il.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Will Deacon <will.deacon@....com>,
        Ingo Molnar <mingo@...nel.org>
Cc:     Bart Van Assche <bvanassche@....org>, ming.lei@...hat.com,
        Frederic Weisbecker <frederic@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Waiman Long <longman@...hat.com>, paulmck@...ux.vnet.ibm.com,
        Boqun Feng <boqun.feng@...il.com>
Subject: Re: [PATCH v3 00/30] Support recursive-read lock deadlock detection

Ping. Thanks.

On Fri, 28 Jun 2019 at 17:15, Yuyang Du <duyuyang@...il.com> wrote:
>
> Hi Peter and Ingo,
>
> Historically, the recursive-read lock is not well supported in lockdep.
> This patchset attempts to solve this problem sound and complete.
>
> The bulk of the algorithm is in patch #27. Now that the recursive-read
> locks are suppported, we have all the 262 cases passed.
>
> Changes from v2:
>
>  - Handle correctly rwsem locks hopefully.
>  - Remove indirect dependency redundancy check.
>  - Check direct dependency redundancy before validation.
>  - Compose lock chains for those with trylocks or separated by trylocks.
>  - Map lock dependencies to lock chains.
>  - Consolidate forward and backward lock_lists.
>  - Clearly and formally define two-task model for lockdep.
>
> Have a good weekend ;)
>
> Thanks,
> Yuyang
>
> --
>
> Yuyang Du (30):
>   locking/lockdep: Rename deadlock check functions
>   locking/lockdep: Change return type of add_chain_cache()
>   locking/lockdep: Change return type of lookup_chain_cache_add()
>   locking/lockdep: Pass lock chain from validate_chain() to
>     check_prev_add()
>   locking/lockdep: Add lock chain list_head field in struct lock_list
>     and lock_chain
>   locking/lockdep: Update comments in struct lock_list and held_lock
>   locking/lockdep: Remove indirect dependency redundancy check
>   locking/lockdep: Skip checks if direct dependency is already present
>   locking/lockdep: Remove chain_head argument in validate_chain()
>   locking/lockdep: Remove useless lock type assignment
>   locking/lockdep: Specify the depth of current lock stack in
>     lookup_chain_cache_add()
>   locking/lockdep: Treat every lock dependency as in a new lock chain
>   locking/lockdep: Combine lock_lists in struct lock_class into an array
>   locking/lockdep: Consolidate forward and backward lock_lists into one
>   locking/lockdep: Add lock chains to direct lock dependency graph
>   locking/lockdep: Use lock type enum to explicitly specify read or
>     write locks
>   locking/lockdep: Add read-write type for a lock 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: 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: Adjust BFS algorithm to support multiple matches
>   locking/lockdep: Define the two task model for lockdep checks formally
>   locking/lockdep: Introduce mark_lock_unaccessed()
>   locking/lockdep: Add nest lock type
>   locking/lockdep: Add lock exclusiveness table
>   locking/lockdep: Support read-write lock's deadlock detection
>   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            |   91 ++-
>  include/linux/rcupdate.h           |    2 +-
>  kernel/locking/lockdep.c           | 1221 ++++++++++++++++++++++++------------
>  kernel/locking/lockdep_internals.h |    3 +-
>  kernel/locking/lockdep_proc.c      |    8 +-
>  lib/locking-selftest.c             | 1109 +++++++++++++++++++++++++++++++-
>  6 files changed, 1975 insertions(+), 459 deletions(-)
>
> --
> 1.8.3.1
>