linux-kernel - Re: [RFC] Dept(Dependency Tracker) Implementation

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Date:   Mon, 23 Nov 2020 21:29:38 +0900
From:   Byungchul Park <byungchul.park@....com>
To:     torvalds@...ux-foundation.org, peterz@...radead.org,
        mingo@...hat.com, will@...nel.org
Cc:     linux-kernel@...r.kernel.org, tglx@...utronix.de,
        rostedt@...dmis.org, joel@...lfernandes.org,
        alexander.levin@...rosoft.com, daniel.vetter@...ll.ch,
        chris@...is-wilson.co.uk, duyuyang@...il.com,
        johannes.berg@...el.com, tj@...nel.org, tytso@....edu,
        willy@...radead.org, david@...morbit.com, amir73il@...il.com,
        bfields@...ldses.org, gregkh@...uxfoundation.org,
        kernel-team@....com
Subject: Re: [RFC] Dept(Dependency Tracker) Implementation

On Mon, Nov 23, 2020 at 08:05:27PM +0900, Byungchul Park wrote:
> Hi,
> 
> This patchset is too nasty to get reviewed in detail for now.

I worked Dept against mainline v5.9.

Thanks,
Byungchul

> This have:
> 
>    1. applying Dept to spinlock/mutex/rwlock/completion
>    2. assigning custom keys or disable maps to avoid false positives
> 
> This doesn't have yet (but will be done):
> 
>    1. proc interfaces e.g. to see dependecies the tool has built,
>    2. applying Dept to rw semaphore and the like,
>    3. applying Dept to lock_page()/unlock_page(),
>    4. assigning custom keys to more places properly,
>    5. replace all manual Lockdep annotations,
>    (and so on..)
> 
> But I decided to share it to let others able to test how it works and
> someone who wants to see the detail able to check the code. The most
> important thing I'd like to show is what exactly a deadlock detection
> tool should do.
> 
> Turn on CONFIG_DEPT to test it. Feel free to leave any questions if you
> have.
> 
> Thanks,
> Byungchul