[PATCH v6 00/13] Add support for DAX vmemmap optimization for ppc64

Aneesh Kumar K V aneesh.kumar at linux.ibm.com
Wed Jul 26 15:29:32 AEST 2023

On 7/26/23 12:59 AM, Andrew Morton wrote:
> On Tue, 25 Jul 2023 00:37:46 +0530 "Aneesh Kumar K.V" <aneesh.kumar at linux.ibm.com> wrote:
>> This patch series implements changes required to support DAX vmemmap
>> optimization for ppc64.
> Do we have any measurements to help us understand the magnitude
> of this optimization?
> And any documentation which helps users understand whether and
> why they should enable this feature?

That is memory space optimization due to kernel reusing the tail page struct pages. The details
of the optimization is documented in patch 11. We document there the impact with both 4k and
64K page size.


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