linux-ext4 - Re: Kernel Benchmarking

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Message-ID: <CAHk-=wj8Bi5Kiufw8_1SEMmxc0GCO5Nh7TxEt+c1HdKaya=LaA@mail.gmail.com>
Date:   Tue, 15 Sep 2020 16:35:45 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Matthieu Baerts <matthieu.baerts@...sares.net>
Cc:     Michael Larabel <Michael@...haellarabel.com>,
        Matthew Wilcox <willy@...radead.org>,
        Amir Goldstein <amir73il@...il.com>,
        "Ted Ts'o" <tytso@...gle.com>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Ext4 Developers List <linux-ext4@...r.kernel.org>,
        Jan Kara <jack@...e.cz>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: Kernel Benchmarking

On Tue, Sep 15, 2020 at 12:56 PM Matthieu Baerts
<matthieu.baerts@...sares.net> wrote:
>
> I am sorry, I am not sure how to verify this. I guess it was one
> processor because I removed "-smp 2" option from qemu. So I guess it
> switched to a uniprocessor mode.

Ok, that all sounds fine. So yes, your problem happens even with just
one CPU, and it's not any subtle SMP race.

Which is all good - apart from the bug existing in the first place, of
course. It just reinforces the "it's probably a latent deadlock"
thing.

              Linus