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SubjectRe: [RFC PATCH 1/2] x86/ibpb: Skip IBPB when we switch back to same user process
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On 01/25/2018 02:01 PM, Andy Lutomirski wrote:
> On Thu, Jan 25, 2018 at 1:57 PM, Andi Kleen <ak@linux.intel.com> wrote:
>> Andy Lutomirski <luto@kernel.org> writes:
>>>
>>> That being said, just stashing last_user_mm without any refcounting
>>> should be fine.
>>
>> If last_user_mm is freed and reallocated by a different process,
>> then that would miss the IPBP incorrectly.
>>
>
> Hmm, right. So ctx_id it is.
>
> --Andy
>
Thanks. Using ctx_id is a pretty clean approach. I will refresh
this patch and drop the second patch.

Tim

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