Re: [Xen-devel] [PATCH v3 4/9] mm: Scrub memory from idle loop

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 05.05.17 at 16:10, <JBeulich@xxxxxxxx> wrote:
>>>> On 05.05.17 at 15:42, <boris.ostrovsky@xxxxxxxxxx> wrote:
>>>>> Otoh there's not much to scrub yet until Dom0 had all its memory
>>>>> allocated, and we know which pages truly remain free (wanting
>>>>> what is currently the boot time scrubbing done on them). But that
>>>>> point in time may still be earlier than when we switch to
>>>>> SYS_STATE_active.
>>> IOW I think boot scrubbing could be kicked off as soon as Dom0
>>> had the bulk of its memory allocated.
>> 
>> Since we only are trying to avoid mapcache vcpu override can't we just
>> scrub whenever override is NULL (per-cpu or not)?
> 
> But how do you know? The variable should remain static in
> domain_page.c, so I think we'd instead need a notification to
> the scrubber when it gets set back to NULL.

And of course if the override variable was per-CPU, you wouldn't
have a need to know, as you wouldn't try scrubbing on the CPU
doing the Dom0 setup.

Jan


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