linux-kernel - RE: [PATCH] sched/fair: fix pick_eevdf to always find the correct se

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Message-ID: <OS0PR01MB5922C4CF327492EE2A0B2BA586C9A@OS0PR01MB5922.jpnprd01.prod.outlook.com>
Date:   Fri, 6 Oct 2023 09:38:03 +0000
From:   Biju Das <biju.das.jz@...renesas.com>
To:     Marek Szyprowski <m.szyprowski@...sung.com>,
        Peter Zijlstra <peterz@...radead.org>
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Subject: RE: [PATCH] sched/fair: fix pick_eevdf to always find the correct se

> Subject: Re: [PATCH] sched/fair: fix pick_eevdf to always find the correct
> se
> 
> On 05.10.2023 17:08, Biju Das wrote:
> > Hi Peter Zijlstra,
> >
> >> Subject: Re: [PATCH] sched/fair: fix pick_eevdf to always find the
> >> correct se
> >>
> >> On Thu, Oct 05, 2023 at 07:31:34AM +0000, Biju Das wrote:
> >>
> >>> [   26.099203] EEVDF scheduling fail, picking leftmost
> >> This, that the problem.. the rest is just noise because printk stinks.
> >>
> >> Weirdly have not seen that trigger, and I've been running with this
> >> patch on for a few days now :/
> > I agree Original issue is "EEVDF scheduling fail, picking leftmost"
> > Which is triggering noisy lock warning messages during boot.
> >
> > 2 platforms are affected both ARM platforms(Renesas and Samsung) Maybe
> > other platforms affected too.
> 
> 
> Just to note, I've run into this issue on the QEmu's 'arm64/virt'
> platform, not on the Samsung specific hardware.

OK, if needed I am happy to test on the real hardware, if a fix found for this issue. It is 100% reproducible Renesas RZ/g2L SMARC EVK platform.

Cheers,
Biju