Re: [RFC PATCH v2 3/7] sched/idle: Add poll before enter real idle path

From	Quan Xu <quan.xu0@gmail.com>
Newsgroups	linux.kernel
Subject	Re: [RFC PATCH v2 3/7] sched/idle: Add poll before enter real idle path
Date	2017-09-14 10:50 +0200
Message-ID	<upy0p-2HK-7@gated-at.bofh.it> (permalink)
References	<ujNbP-25K-5@gated-at.bofh.it> <ujNbP-25K-9@gated-at.bofh.it> <ujO7U-2G2-3@gated-at.bofh.it> <ukN9M-81v-3@gated-at.bofh.it>
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on 2017/9/1 13:57, Quan Xu wrote:
> on 2017/8/29 20:45, Peter Zijlstra wrote:
>
>> On Tue, Aug 29, 2017 at 11:46:37AM +0000, Yang Zhang wrote:
>>> Add poll in do_idle. For UP VM, if there are running task, it will not
>>> goes into idle path, so we only enable poll in SMP VM.
>>>
>>> Signed-off-by: Yang Zhang <yang.zhang.wz@gmail.com>
>>> Signed-off-by: Quan Xu <quan.xu0@gmail.com>
>> Broken SoB chain.
>   Peter,  I can't follow 'Broken SoB chain'.. could you explain more 
> about it?
>
     Peter, Ping..

Quan



>   -Quan
>
>>> diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c
>>> index 6c23e30..b374744 100644
>>> --- a/kernel/sched/idle.c
>>> +++ b/kernel/sched/idle.c
>>> @@ -74,6 +74,7 @@ static noinline int __cpuidle cpu_idle_poll(void)
>>>   }
>>>     /* Weak implementations for optional arch specific functions */
>>> +void __weak arch_cpu_idle_poll(void) { }
>>>   void __weak arch_cpu_idle_prepare(void) { }
>>>   void __weak arch_cpu_idle_enter(void) { }
>> And not a word on why we need a new arch hook. What's wrong with
>> arch_cpu_idle_enter() for instance?
>

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Re: [RFC PATCH v2 3/7] sched/idle: Add poll before enter real idle  path Quan Xu <quan.xu0@gmail.com> - 2017-09-14 10:50 +0200
  Re: [RFC PATCH v2 3/7] sched/idle: Add poll before enter real idle  path Borislav Petkov <bp@alien8.de> - 2017-09-14 11:20 +0200

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