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

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Message-ID: <8247ce4d-15b7-03b2-0c9b-74f8cd6cad50@molgen.mpg.de>
Date:   Mon, 17 Apr 2023 13:19:47 +0200
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        David Woodhouse <dwmw@...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>,
        "Guilherme G. Piccoli" <gpiccoli@...lia.com>,
        Piotr Gorski <lucjan.lucjanov@...il.com>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Usama Arif <usama.arif@...edance.com>,
        Jürgen 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>
Subject: Re: [patch 00/37] cpu/hotplug, x86: Reworked parallel CPU bringup

Dear Thomas,


Am 15.04.23 um 01:44 schrieb Thomas Gleixner:

> This is a complete rework of the parallel bringup patch series (V17)
> 
>      https://lore.kernel.org/lkml/20230328195758.1049469-1-usama.arif@bytedance.com
> 
> to address the issues which were discovered in review:

[…]

Thank you very much for your rework.

I tested this on the ASUS F2A85-M PRO, and get a delay of ten seconds.

```
[…]
[    0.258193] smpboot: CPU0: AMD A6-6400K APU with Radeon(tm) HD 
Graphics (family: 0x15, model: 0x13, stepping: 0x1)
[…]
[    0.259329] smp: Bringing up secondary CPUs ...
[    0.259527] x86: Booting SMP configuration:
[    0.259528] .... node  #0, CPUs:      #1
[    0.261007] After schedule_preempt_disabled
[   10.260990] CPU1 failed to report alive state
[   10.261070] smp: Brought up 1 node, 1 CPU
[   10.261073] smpboot: Max logical packages: 2
[   10.261074] smpboot: Total of 1 processors activated (7800.54 BogoMIPS)
[   10.261601] devtmpfs: initialized
[   10.261697] x86/mm: Memory block size: 128MB
```

This delay has been there with v6.3-rc6-46-gde4664485abbc and some 
custom (printk) patches on top and merging dwmw2/parallel-6.2-rc3-v16 
into it. I only tested this. I think dwmw2/parallel-6.2-v17 failed to 
build for me, when trying to merge it into Linus’ master version at that 
time. I didn’t come around to report it, and you posted your rework, so 
I am replying here.

I am going to try your branch directly in the next days, but just wanted 
to report back already.


Kind regards,

Paul
View attachment "kodi-linux-6.3-rc6-smp-tglx.txt" of type "text/plain" (61769 bytes)