linux-kernel - Re: [PATCH v4 00/27] hugetlb/CMA improvements for large systems

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Message-ID: <CAPTztWY8iGZjYpsESNByt9My9H+YvrLiNVJAe+L_j1C4CUaEFg@mail.gmail.com>
Date: Wed, 19 Feb 2025 10:09:49 -0800
From: Frank van der Linden <fvdl@...gle.com>
To: akpm@...ux-foundation.org, muchun.song@...ux.dev, linux-mm@...ck.org, 
	linux-kernel@...r.kernel.org
Cc: yuzhao@...gle.com, usamaarif642@...il.com, joao.m.martins@...cle.com, 
	roman.gushchin@...ux.dev
Subject: Re: [PATCH v4 00/27] hugetlb/CMA improvements for large systems

I forgot to add this to the cover letter:

These first 4 are the multi-range CMA support, and can be reviewed as
an independent series:
>   mm/cma: export total and free number of pages for CMA areas
>   mm, cma: support multiple contiguous ranges, if requested
>   mm/cma: introduce cma_intersects function
>   mm, hugetlb: use cma_declare_contiguous_multi

These implement huge/gigantic page pre-HVO, and can also be reviewed
as a separate series if that's more convenient:
>   mm/hugetlb: remove redundant __ClearPageReserved
>   mm/hugetlb: use online nodes for bootmem allocation
>   mm/hugetlb: convert cmdline parameters from setup to early
>   x86/mm: make register_page_bootmem_memmap handle PTE mappings
>   mm/bootmem_info: export register_page_bootmem_memmap
>   mm/sparse: allow for alternate vmemmap section init at boot
>   mm/hugetlb: set migratetype for bootmem folios
>   mm: define __init_reserved_page_zone function
>   mm/hugetlb: check bootmem pages for zone intersections
>   mm/sparse: add vmemmap_*_hvo functions
>   mm/hugetlb: deal with multiple calls to hugetlb_bootmem_alloc
>   mm/hugetlb: move huge_boot_pages list init to hugetlb_bootmem_alloc
>   mm/hugetlb: add pre-HVO framework
>   mm/hugetlb_vmemmap: fix hugetlb_vmemmap_restore_folios definition
>   mm/hugetlb: do pre-HVO for bootmem allocated pages
>   x86/setup: call hugetlb_bootmem_alloc early
>   x86/mm: set ARCH_WANT_SPARSEMEM_VMEMMAP_PREINIT

These implement early allocations from CMA, enabling pre-HVO of
pre-allocated CMA hugepages. It depends on the previous two groups of
patches:
>   mm/cma: simplify zone intersection check
>   mm/cma: introduce a cma validate function
>   mm/cma: introduce interface for early reservations
>   mm/hugetlb: add hugetlb_cma_only cmdline option
>   mm/hugetlb: enable bootmem allocation from CMA areas
>   mm/hugetlb: move hugetlb CMA code in to its own file
>