Re: [PATCH] x86, hugetlb: add missing TLB page invalidation for hugetlb_cow()

[Oren Twaig]

On 05/15/2014 08:00 PM, Anthony Iliopoulos wrote:
> I have dismissed this case, since I assume that there are many more
> cycles spent in servicing the TLB invalidation IPI, walking the pgtable
> plus other related overhead (e.g. sched) than in updating the pte/pmd
> so I am not sure how possible it would be to hit this condition.

Hi Anthony,

I have a question about the above statement. What will happen with multi
cpu VMs ? won't the race described above can happen ? I.e one virtual CPU
can will visit the host and the other will continue to encounter your race ?

Thanks,
Oren.


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