linux-kernel - Re: [PATCH] use x86 cpu park to speedup smp

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Message-ID: <1e93651f-7444-2957-1f39-09bca981e57d@huawei.com>
Date:   Thu, 17 Dec 2020 22:53:26 +0800
From:   "shenkai (D)" <shenkai8@...wei.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>
CC:     LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        X86 ML <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
        <hewenliang4@...wei.com>, <hushiyuan@...wei.com>,
        <luolongjun@...wei.com>, <hejingxian@...wei.com>
Subject: Re: [PATCH] use x86 cpu park to speedup smp_init in kexec situation

在 2020/12/16 23:31, Thomas Gleixner 写道:
> OTOH, the advantage of INIT/SIPI is that the AP comes up in a well known
> state.

We can set APs to a known state explicitly like BSP will do in kexec 
case (what we also tried

to do in the patch). Maybe it is not a big problem?

Best regards

Kai