linux-kernel - Re: PI futexes + lock stealing woes

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Message-ID: <87lgieqgz3.fsf@kerf.amer.corp.natinst.com>
Date:   Thu, 07 Dec 2017 17:02:40 -0600
From:   Gratian Crisan <gratian.crisan@...com>
To:     Julia Cartwright <julia@...com>
Cc:     Gratian Crisan <gratian.crisan@...com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org, Darren Hart <dvhart@...radead.org>,
        Ingo Molnar <mingo@...hat.com>
Subject: Re: PI futexes + lock stealing woes


Julia Cartwright writes:

> On Thu, Dec 07, 2017 at 08:57:59AM -0600, Gratian Crisan wrote:
>>
>> Peter Zijlstra writes:
>> > The below compiles and boots, but is otherwise untested. Could you give
>> > it a spin?
>>
>> Thank you! Yes, I'll start a test now.
>
> I gave it a spin with my minimal reproducing case w/ the strategic
> msleep().  Previously, I could reproduce it in less than a minute in
> that setup; now it's been running for a couple hours.  So ... looks
> good? :)

Yep ... looks good to me. I've been running two targets with the
original reproducer for 8 hours now plus a target running the C test.
All of them are still going.

I'm going to let them run overnight to make sure but I'm going to call
it fixed.

-Gratian