On Fri, Feb 11, 2022 at 3:34 AM Joao Martins wrote:
[...]
> pte_t * __meminit vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int
> node,
> - struct vmem_altmap *altmap)
> + struct vmem_altmap *altmap,
> +
On Fri, Feb 11, 2022 at 3:34 AM Joao Martins wrote:
>
> In preparation for describing a memmap with compound pages, move the
> actual pte population logic into a separate function
> vmemmap_populate_address() and have vmemmap_populate_basepages() walk
> through all base pages it needs to populate.
On Fri, Feb 11, 2022 at 3:34 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. Update
> memmap_init_zone_device() to sk
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. Update
memmap_init_zone_device() to skip redundant initialization, detailed
below.
When a pgmap @vme
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
Reviewed-by: Muchun Song
Reviewed-b
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 advantage of the fact that most tail pages look the same (except
the first two) to minimize struct page ove
In preparation for describing a memmap with compound pages, move the
actual pte population logic into a separate function
vmemmap_populate_address() and have vmemmap_populate_basepages() walk
through all base pages it needs to populate.
Signed-off-by: Joao Martins
---
mm/sparse-vmemmap.c | 51 ++
Changes since v4[0]:
* Rebased to next-20220210.
* Adjust patch 3, given Muchun changes to the comment block, retained
the Rb tags considering it is still just a move of text.
* Rename @geometry to @vmemmap_shift in all patches/cover-letter.
* Rename pgmap_geometry() calls to pgmap_vmemmap_nr
In support of using compound pages for devmap mappings, plumb the pgmap
down to the vmemmap_populate implementation. Note that while altmap is
retrievable from pgmap the memory hotplug code passes altmap without
pgmap[*], so both need to be independently plumbed.
So in addition to @altmap, pass @p
