Re: [Xen-devel] [PATCH 2/2] Xen/mem_event: Prevent underflow of vcpu pause counts

["Aravindh Puthiyaparambil (aravindp)" <aravindp@xxxxxxxxx>]

>> +void mem_event_vcpu_unpause(struct vcpu *v) {
>> +    if ( test_and_clear_bool(v->paused_for_mem_event) )
>
>And now that we consider more than one mem event piling up to pause a
>vcpu, this has to become an atomic counter, which unpauses on zero, and
>takes care of underflow.

Very true. I have seen this event pile up occur in practice in our product.

Thanks,
Aravindh

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