linux-kernel - Re: [RFC PATCH v4 00/19] Core scheduling v4

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Message-ID: <20200318011058.GB111608@google.com>
Date:   Tue, 17 Mar 2020 21:10:58 -0400
From:   Joel Fernandes <joel@...lfernandes.org>
To:     Tim Chen <tim.c.chen@...ux.intel.com>
Cc:     Julien Desfossez <jdesfossez@...italocean.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Vineeth Remanan Pillai <vpillai@...italocean.com>,
        Aubrey Li <aubrey.intel@...il.com>,
        Nishanth Aravamudan <naravamudan@...italocean.com>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Paul Turner <pjt@...gle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        Dario Faggioli <dfaggioli@...e.com>,
        Frédéric Weisbecker <fweisbec@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Greg Kerr <kerrnel@...gle.com>, Phil Auld <pauld@...hat.com>,
        Aaron Lu <aaron.lwe@...il.com>,
        Valentin Schneider <valentin.schneider@....com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        "Luck, Tony" <tony.luck@...el.com>
Subject: Re: [RFC PATCH v4 00/19] Core scheduling v4

Hi Tim,

On Tue, Mar 17, 2020 at 01:18:45PM -0700, Tim Chen wrote:
[..] 
> Did you guys have a chance to try out v5 core scheduler?
> 
> > - Joel(ChromeOS) found a deadlock and crash on PREEMPT kernel in the
> >   coreshed idle balance logic
> 
> We did some patches to fix a few stability issues in v4.  I wonder
> if v5 still has the deadlock that you saw before?

I have not yet tested v5. I fixed the RCU-related deadlock in the scheduler
with this patch sent few days ago:
https://lore.kernel.org/patchwork/patch/1209561/

I'll rebase my tree on v5 soon.

Thanks!

 - Joel