The patch titled
Subject: mm: hugetlb_vmemmap: introduce ARCH_WANT_HUGETLB_PAGE_FREE_VMEMMAP
has been added to the -mm tree. Its filename is
mm-hugetlb_vmemmap-introduce-arch_want_hugetlb_page_free_vmemmap.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-hugetlb_vmemmap-introduce-arch_want_hugetlb_page_free_vmemmap.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-hugetlb_vmemmap-introduce-arch_want_hugetlb_page_free_vmemmap.patch
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------------------------------------------------------
From: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Subject: 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@xxxxxxxxxxxxx
Signed-off-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Suggested-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Reviewed-by: Barry Song <baohua@xxxxxxxxxx>
Tested-by: Barry Song <baohua@xxxxxxxxxx>
Cc: Bodeddula Balasubramaniam <bodeddub@xxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Fam Zheng <fam.zheng@xxxxxxxxxxxxx>
Cc: James Morse <james.morse@xxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Xiongchun Duan <duanxiongchun@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/Kconfig | 1 +
fs/Kconfig | 10 +++++++++-
2 files changed, 10 insertions(+), 1 deletion(-)
--- a/arch/x86/Kconfig~mm-hugetlb_vmemmap-introduce-arch_want_hugetlb_page_free_vmemmap
+++ a/arch/x86/Kconfig
@@ -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_RT_DELAYED_SIGNALS
select ARCH_WANTS_THP_SWAP if X86_64
--- a/fs/Kconfig~mm-hugetlb_vmemmap-introduce-arch_want_hugetlb_page_free_vmemmap
+++ a/fs/Kconfig
@@ -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
_
Patches currently in -mm which might be from songmuchun@xxxxxxxxxxxxx are
mm-kfence-fix-objcgs-vector-allocation.patch
mm-hugetlb_vmemmap-introduce-arch_want_hugetlb_page_free_vmemmap.patch
arm64-mm-hugetlb-enable-hugetlb_page_free_vmemmap-for-arm64.patch
