Re: [PATCH v6 02/11] locking/osq: Drop the overload of osq_lock()

Davidlohr Bueso
2016-10-29T16:52:16Z

On Fri, 28 Oct 2016, Pan Xinhui wrote:
> /*
> * If we need to reschedule bail... so we can block.
>+ * Use vcpu_is_preempted to detech lock holder preemption issue
^^ detect
>+ * and break.

Could you please remove the rest of this comment? Its just noise to point out
that vcpu_is_preempted is a macro defined by arch/false. This is standard protocol
in the kernel.

Same goes for all locks you change with this.

Thanks,
Davidlohr

> * vcpu_is_preempted is a macro defined by false if
>+ * arch does not support vcpu preempted check,
> */
>- if (need_resched())
>+ if (need_resched() || vcpu_is_preempted(node_cpu(node->prev)))
> goto unqueue;
>
> cpu_relax_lowlatency();
>--
>2.4.11
>