Joao Martins writes:
> In preparation for device-dax for using hugetlbfs compound page tail
> deduplication technique, move the comment block explanation into a
> common place in Documentation/vm.
>
> Cc: Muchun Song
> Cc: Mike Kravetz
> Suggested-by: Dan Williams
> Signed-off-by: Joao Martins
On 3/4/22 03:27, Muchun Song wrote:
> On Fri, Mar 4, 2022 at 5:33 AM Joao Martins wrote:
>>
>> Currently memmap_init_zone_device() ends up initializing 32768 pages
>> when it only needs to initialize 128 given tail page reuse. That
>> number is worse with 1GB compound pages, 262144 instead of 128.
On 3/4/22 03:09, Muchun Song wrote:
> On Fri, Mar 4, 2022 at 5:33 AM Joao Martins wrote:
>> A compound devmap is a dev_pagemap with @vmemmap_shift > 0 and it
>> means that pages are mapped at a given huge page alignment and utilize
>> uses compound pages as opposed to order-0 pages.
>>
>> Take adv
