Commit 47010c04 authored by Muchun Song's avatar Muchun Song Committed by Andrew Morton
Browse files

mm: hugetlb_vmemmap: cleanup CONFIG_HUGETLB_PAGE_FREE_VMEMMAP* 

The word of "free" is not expressive enough to express the feature of
optimizing vmemmap pages associated with each HugeTLB, rename this keywork
to "optimize".  In this patch , cheanup configs to make code more
expressive.

Link: https://lkml.kernel.org/r/20220404074652.68024-4-songmuchun@bytedance.com


Signed-off-by: default avatarMuchun Song <songmuchun@bytedance.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: David Hildenbrand <david@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent f10f1442

Documentation/admin-guide/kernel-parameters.txt

+2 −2
Original line number Diff line number Diff line
@@ -1660,7 +1660,7 @@ 
			Format: size[KMG]



	hugetlb_free_vmemmap=

			[KNL] Reguires CONFIG_HUGETLB_PAGE_FREE_VMEMMAP

			[KNL] Reguires CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP

			enabled.

			Allows heavy hugetlb users to free up some more

			memory (7 * PAGE_SIZE for each 2MB hugetlb page).
@@ -1669,7 +1669,7 @@ 
			on:  enable the feature

			off: disable the feature



			Built with CONFIG_HUGETLB_PAGE_FREE_VMEMMAP_DEFAULT_ON=y,

			Built with CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON=y,

			the default is on.



			This is not compatible with memory_hotplug.memmap_on_memory.

Documentation/admin-guide/mm/hugetlbpage.rst

+1 −1
Original line number Diff line number Diff line
@@ -164,7 +164,7 @@ default_hugepagesz 
	will all result in 256 2M huge pages being allocated.  Valid default

	huge page size is architecture dependent.

hugetlb_free_vmemmap

	When CONFIG_HUGETLB_PAGE_FREE_VMEMMAP is set, this enables freeing

	When CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP is set, this enables optimizing

	unused vmemmap pages associated with each HugeTLB page.



When multiple huge page sizes are supported, ``/proc/sys/vm/nr_hugepages``

arch/arm64/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -97,7 +97,7 @@ config ARM64 
	select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT

	select ARCH_WANT_FRAME_POINTERS

	select ARCH_WANT_HUGE_PMD_SHARE if ARM64_4K_PAGES || (ARM64_16K_PAGES && !ARM64_VA_BITS_36)

	select ARCH_WANT_HUGETLB_PAGE_FREE_VMEMMAP

	select ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP

	select ARCH_WANT_LD_ORPHAN_WARN

	select ARCH_WANTS_NO_INSTR

	select ARCH_HAS_UBSAN_SANITIZE_ALL

arch/arm64/mm/flush.c

+1 −1
Original line number Diff line number Diff line
@@ -78,7 +78,7 @@ void flush_dcache_page(struct page *page) 
	/*

	 * Only the head page's flags of HugeTLB can be cleared since the tail

	 * vmemmap pages associated with each HugeTLB page are mapped with

	 * read-only when CONFIG_HUGETLB_PAGE_FREE_VMEMMAP is enabled (more

	 * read-only when CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP is enabled (more

	 * details can refer to vmemmap_remap_pte()).  Although

	 * __sync_icache_dcache() only set PG_dcache_clean flag on the head

	 * page struct, there is more than one page struct with PG_dcache_clean

arch/x86/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -121,7 +121,7 @@ config X86 
	select ARCH_WANTS_NO_INSTR

	select ARCH_WANT_GENERAL_HUGETLB

	select ARCH_WANT_HUGE_PMD_SHARE

	select ARCH_WANT_HUGETLB_PAGE_FREE_VMEMMAP	if X86_64

	select ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP	if X86_64

	select ARCH_WANT_LD_ORPHAN_WARN

	select ARCH_WANTS_THP_SWAP		if X86_64

	select ARCH_HAS_PARANOID_L1D_FLUSH