Commit 2e4ec02b authored by Muchun Song's avatar Muchun Song Committed by Andrew Morton
Browse files

mm: hugetlb_vmemmap: introduce ARCH_WANT_HUGETLB_PAGE_FREE_VMEMMAP 

The feature of minimizing overhead of struct page associated with each
HugeTLB page is implemented on x86_64, however, the infrastructure of this
feature is already there, we could easily enable it for other
architectures.  Introduce ARCH_WANT_HUGETLB_PAGE_FREE_VMEMMAP for other
architectures to be easily enabled.  Just select this config if they want
to enable this feature.

Link: https://lkml.kernel.org/r/20220331065640.5777-1-songmuchun@bytedance.com


Signed-off-by: default avatarMuchun Song <songmuchun@bytedance.com>
Suggested-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Reviewed-by: default avatarBarry Song <baohua@kernel.org>
Tested-by: default avatarBarry Song <baohua@kernel.org>
Reviewed-by: default avatarAnshuman Khandual <anshuman.khandual@arm.com>
Cc: Bodeddula Balasubramaniam <bodeddub@amazon.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Fam Zheng <fam.zheng@bytedance.com>
Cc: James Morse <james.morse@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Will Deacon <will@kernel.org>
Cc: Xiongchun Duan <duanxiongchun@bytedance.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 84448c8e

arch/x86/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -121,6 +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_LD_ORPHAN_WARN

	select ARCH_WANTS_THP_SWAP		if X86_64

	select ARCH_HAS_PARANOID_L1D_FLUSH

fs/Kconfig

+9 −1
Original line number Diff line number Diff line
@@ -245,9 +245,17 @@ config HUGETLBFS 
config HUGETLB_PAGE

	def_bool HUGETLBFS



#

# Select this config option from the architecture Kconfig, if it is preferred

# to enable the feature of minimizing overhead of struct page associated with

# each HugeTLB page.

#

config ARCH_WANT_HUGETLB_PAGE_FREE_VMEMMAP

	bool



config HUGETLB_PAGE_FREE_VMEMMAP

	def_bool HUGETLB_PAGE

	depends on X86_64

	depends on ARCH_WANT_HUGETLB_PAGE_FREE_VMEMMAP

	depends on SPARSEMEM_VMEMMAP



config HUGETLB_PAGE_FREE_VMEMMAP_DEFAULT_ON