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

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Message-ID: <20220219100519.GB10342@X58A-UD3R>
Date:   Sat, 19 Feb 2022 19:05:19 +0900
From:   Byungchul Park <byungchul.park@....com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Theodore Ts'o <tytso@....edu>, 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,
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        hamohammed.sa@...il.com
Subject: Re: [PATCH 00/16] DEPT(Dependency Tracker)

On Thu, Feb 17, 2022 at 05:06:18PM +0000, Matthew Wilcox wrote:
> 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.

I appreciate your support. I'll do my best to make it *THE* perfect tool
for that purpose. I'd feel great if it helps a lot and saves you guys'
time in advance, it might not for now tho.

Thanks,
Byungchul