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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: Muchun Song <songmuchun@bytedance.com>
Suggested-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Barry Song <baohua@kernel.org>
Tested-by: Barry Song <baohua@kernel.org>
Reviewed-by: Anshuman 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: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Muchun Song 2022-04-28 23:16:03 -07:00 committed by akpm
parent 84448c8ecd
commit 2e4ec02bbc
2 changed files with 10 additions and 1 deletions
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1
arch/x86/Kconfig
View File

@ -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

10
fs/Kconfig
View File

@ -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