linux-kernel - Re: [patch V4 00/37] cpu/hotplug, x86: Reworked parallel CPU bringup

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Date:   Sun, 14 May 2023 18:48:50 -0300
From:   "Guilherme G. Piccoli" <gpiccoli@...lia.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, David Woodhouse <dwmw2@...radead.org>,
        Andrew Cooper <andrew.cooper3@...rix.com>,
        Brian Gerst <brgerst@...il.com>,
        Arjan van de Veen <arjan@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Paul McKenney <paulmck@...nel.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        Sean Christopherson <seanjc@...gle.com>,
        Oleksandr Natalenko <oleksandr@...alenko.name>,
        Paul Menzel <pmenzel@...gen.mpg.de>,
        Piotr Gorski <lucjan.lucjanov@...il.com>,
        Usama Arif <usama.arif@...edance.com>,
        Juergen Gross <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        xen-devel@...ts.xenproject.org,
        Russell King <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        linux-arm-kernel@...ts.infradead.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Guo Ren <guoren@...nel.org>,
        linux-csky@...r.kernel.org,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        linux-mips@...r.kernel.org,
        "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
        Helge Deller <deller@....de>, linux-parisc@...r.kernel.org,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        linux-riscv@...ts.infradead.org,
        Mark Rutland <mark.rutland@....com>,
        Sabin Rapan <sabrapan@...zon.com>,
        "Michael Kelley (LINUX)" <mikelley@...rosoft.com>,
        Ross Philipson <ross.philipson@...cle.com>
Subject: Re: [patch V4 00/37] cpu/hotplug, x86: Reworked parallel CPU bringup

On 12/05/2023 18:06, Thomas Gleixner wrote:
> Hi!
> 
> This is version 4 of the reworked parallel bringup series. Version 3 can be
> found here:
> 
>    https://lore.kernel.org/lkml/20230508181633.089804905@linutronix.de


Hi Thomas, thanks for series! I was able to test it on the Steam Deck
(on top of 6.4-rc2), and everything is working fine; also tested S3
suspend/resume, working as expected.

Some logs from boot time:


Parallel boot
[    0.239764] smp: Bringing up secondary CPUs ...
[...]
[    0.253130] smp: Brought up 1 node, 8 CPUs


Regular boot (with cpuhp.parallel=0)
[    0.240093] smp: Bringing up secondary CPUs ...
[...]
[    0.253475] smp: Brought up 1 node, 8 CPUs


Feel free to add (to the series):

Tested-by: Guilherme G. Piccoli <gpiccoli@...lia.com> # Steam Deck

Cheers,


Guilherme