linux-ext4 - Re: [PATCH 00/16] DEPT(Dependency Tracker)

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Date:   Thu, 17 Feb 2022 17:06:18 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Theodore Ts'o <tytso@....edu>,
        Byungchul Park <byungchul.park@....com>,
        torvalds@...ux-foundation.org, damien.lemoal@...nsource.wdc.com,
        linux-ide@...r.kernel.org, adilger.kernel@...ger.ca,
        linux-ext4@...r.kernel.org, mingo@...hat.com,
        linux-kernel@...r.kernel.org, peterz@...radead.org,
        will@...nel.org, tglx@...utronix.de, joel@...lfernandes.org,
        sashal@...nel.org, daniel.vetter@...ll.ch,
        chris@...is-wilson.co.uk, duyuyang@...il.com,
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        amir73il@...il.com, bfields@...ldses.org,
        gregkh@...uxfoundation.org, kernel-team@....com,
        linux-mm@...ck.org, akpm@...ux-foundation.org, mhocko@...nel.org,
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        rodrigosiqueiramelo@...il.com, melissa.srw@...il.com,
        hamohammed.sa@...il.com
Subject: Re: [PATCH 00/16] DEPT(Dependency Tracker)

On Thu, Feb 17, 2022 at 12:00:05PM -0500, Steven Rostedt wrote:
> On Thu, 17 Feb 2022 10:51:09 -0500
> "Theodore Ts'o" <tytso@....edu> wrote:
> 
> > I know that you're trying to help us, but this tool needs to be far
> > better than Lockdep before we should think about merging it.  Even if
> > it finds 5% more potential deadlocks, if it creates 95% more false
> > positive reports --- and the ones it finds are crazy things that
> > rarely actually happen in practice, are the costs worth the benefits?
> > And who is bearing the costs, and who is receiving the benefits?
> 
> I personally believe that there's potential that this can be helpful and we
> will want to merge it.
> 
> But, what I believe Ted is trying to say is, if you do not know if the
> report is a bug or not, please do not ask the maintainers to determine it
> for you. This is a good opportunity for you to look to see why your tool
> reported an issue, and learn that subsystem. Look at if this is really a
> bug or not, and investigate why.

I agree with Steven here, to the point where I'm willing to invest some
time being a beta-tester for this, so if you focus your efforts on
filesystem/mm kinds of problems, I can continue looking at them and
tell you what's helpful and what's unhelpful in the reports.