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Date:   Tue, 15 Sep 2020 21:38:38 +0200
From:   Matthieu Baerts <>
To:     Linus Torvalds <>
Cc:     Michael Larabel <>,
        Matthew Wilcox <>,
        Amir Goldstein <>,
        Ted Ts'o <>,
        Andreas Dilger <>,
        Ext4 Developers List <>,
        Jan Kara <>,
        linux-fsdevel <>
Subject: Re: Kernel Benchmarking

On 15/09/2020 21:24, Linus Torvalds wrote:
> On Tue, Sep 15, 2020 at 12:01 PM Matthieu Baerts
> <> wrote:
>> I forgot one important thing, I was on top of David Miller's net-next
>> branch by reflex. I can redo the traces on top of linux-next if needed.
> Not likely an issue.
> I'll go stare at the page lock code again to see if I've missed
> anything. I still suspect it's a latent ABBA deadlock that is just
> much *much* easier to trigger with the synchronous lock handoff, but I
> don't see where it is.
> I guess this is all fairly theoretical since we apparently need to do
> that hybrid "limited fairness" patch anyway, and it fixes your issue,
> but I hate not understanding the problem.

I understand :)
Thank you again for looking at this issue!

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