linux-kernel - Re: Report 2 in ext4 and journal based on v5.17-rc1

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Date:   Thu, 3 Mar 2022 09:36:25 -0500
From:   "Theodore Ts'o" <tytso@....edu>
To:     Byungchul Park <byungchul.park@....com>
Cc:     damien.lemoal@...nsource.wdc.com, linux-ide@...r.kernel.org,
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Subject: Re: Report 2 in ext4 and journal based on v5.17-rc1

On Thu, Mar 03, 2022 at 02:23:33PM +0900, Byungchul Park wrote:
> I totally agree with you. *They aren't really locks but it's just waits
> and wakeups.* That's exactly why I decided to develop Dept. Dept is not
> interested in locks unlike Lockdep, but fouces on waits and wakeup
> sources itself. I think you get Dept wrong a lot. Please ask me more if
> you have things you doubt about Dept.

So the question is this --- do you now understand why, even though
there is a circular dependency, nothing gets stalled in the
interactions between the two wait channels?

						- Ted