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

From: Catalin Marinas
Date: Wed Sep 23 2020 - 04:43:24 EST

Hi Gavin,

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.