linux-kernel - Re: [PATCH] LoongArch: Implement stable timer shutdown interface

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Date:   Fri, 17 Nov 2023 00:15:12 +0800
From:   WANG Xuerui <kernel@...0n.name>
To:     maobibo <maobibo@...ngson.cn>, Huacai Chen <chenhuacai@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>, loongarch@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] LoongArch: Implement stable timer shutdown interface


On 11/16/23 16:21, maobibo wrote:
>>> arch_cpu_idle_dead is called. Timer interrupt for this processor should
>>> be disabled, else there will be timer interrupt for the dead cpu. Also
>>> this prevents vcpu to schedule out during halt-polling flow when system
>>> is running in vm mode, since there is pending timer interrupt.
>>
>> The logical relationship is a bit unclear, is my paraphrasing correct 
>> in your opinion?
>>
>> "Timer interrupt for this processor should be disabled, else a 
>> pending timer interrupt will prevent the vCPU from scheduling out 
>> during the halt-polling flow when system is running in VM mode"
>>
>> (I don't immediately know what a "schedule out" is. Is that a 
>> translation artifact or some KVM jargon?)
> how about "prevent the vCPU from giving up scheduling"?
That's very easy to understand, so no problem and thanks!

-- 
WANG "xen0n" Xuerui

Linux/LoongArch mailing list: https://lore.kernel.org/loongarch/