linux-kernel - Re: [PATCH] locking/pvqspinlock: Wait early if vcpu is preempted

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Date:   Thu, 5 Jan 2017 16:44:25 +0800
From:   Pan Xinhui <xinhui@...ux.vnet.ibm.com>
To:     Ingo Molnar <mingo@...nel.org>,
        Pan Xinhui <xinhui.pan@...ux.vnet.ibm.com>
Cc:     linux-kernel@...r.kernel.org, mingo@...hat.com,
        peterz@...radead.org, longman@...hat.com
Subject: Re: [PATCH] locking/pvqspinlock: Wait early if vcpu is preempted



在 2017/1/5 16:23, Ingo Molnar 写道:
>
> * Pan Xinhui <xinhui.pan@...ux.vnet.ibm.com> wrote:
>
>> If prev node is not in runnig state or its cpu is preempted, we need
>> wait early in pv_wait_node. After commit "sched/core: Introduce the
>> vcpu_is_preempted(cpu) interface" kernel has knowledge of one vcpu is
>> running or not. So lets use it.
>
> That's not how we reference upstream commits. I had to search the git log the hard
> way to figure out that it's commit d9345c65eb79 ...
>
hi, Ingo
	Sorry. Such stupid mistake will not happen next time.

> Also, once you look at that commit you'll see how sloppy the capitalization in
> your changelog is. I fixed that up for all the original commits in the hope of you
> learning from those mistakes - but that was last year and the experiment failed.
>
So sorry, I pay most attention on spelling of words. :(
Maybe I rely on the tools of ./scripts/checkpatch.pl too much.
I will rewrite the comments and resend this patch.

> Thanks,
>
> 	Ingo
>