[PATCH] um: implement arch_sync_kernel_mappings

[Anton Ivanov]

On 16/03/2021 10:44, Johannes Berg wrote:
> On Tue, 2021-03-16 at 10:02 +0000, Anton Ivanov wrote:
>> On 16/03/2021 09:59, Johannes Berg wrote:
>>> On Tue, 2021-03-16 at 09:58 +0000, anton.ivanov at cambridgegreys.com
>>> wrote:
>>>> From: Anton Ivanov <anton.ivanov at cambridgegreys.com>
>>>>
>>>> This improves the tlb flushing behavior by syncing modified
>>>> ranges out of map_kernel_range_noflush in a way which is
>>>> similar to x86.
>>> So I take it this replaces my patch?
>>
>> I get slightly better performance on userspace,
>> etc compared to your patch. It is marginal -
>> sub 1% close to the experimental error.
> 
> Why does that even affect userspace at all, btw? We're talking about
> kernel mappings?

My userspace tests do heavy IO.

> 
> Do you see this speed up userspace relative to my patch, or relative to
> unpatched?
> 
> johannes
> 
> 
> 
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-- 
Anton R. Ivanov
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