Re: [PATCH v2 0/2] arm64/mm: Enable color zero pages

Gavin Shan
2020-09-23T22:48:41Z

Hi Catalin,

On 9/23/20 6:43 PM, Catalin Marinas wrote:
> On Wed, Sep 23, 2020 at 03:37:19PM +1000, Gavin Shan wrote:
>> The feature of color zero pages isn't enabled on arm64, meaning all
>> read-only (anonymous) VM areas are backed up by same zero page. It
>> leads pressure to L1 (data) cache on reading data from them. This
>> tries to enable color zero pages.
>>
>> PATCH[1/2] decouples the zero PGD table from zero page
>> PATCH[2/2] allocates the needed zero pages according to L1 cache size
>
> To save you (and potential reviewers) some time, please include in the
> cover letter details of a realistic workload/benchmark that is improved
> by this patchset, backed by numbers. Just because it's doable and the
> patches aren't too complex is not a good enough reason for merging.
>

Sure, Please ignore this (v2) series for now. I'll try to provide
performance data in v3 even I'm not positive about that because
it depends on CPU's L1 dCache size :)

Cheers,
Gavin