[PATCH] arm64: mm: hugetlb: add support for free vmemmap pages of HugeTLB
From: Muchun Song <hidden>
Date: 2021-05-18 09:21:35
Also in:
linux-mm, lkml
Subsystem:
arm64 port (aarch64 architecture), filesystems (vfs and infrastructure), the rest · Maintainers:
Catalin Marinas, Will Deacon, Alexander Viro, Christian Brauner, Linus Torvalds
The preparation of supporting freeing vmemmap associated with each HugeTLB page is ready, so we can support this feature for arm64. Signed-off-by: Muchun Song <redacted> --- arch/arm64/mm/mmu.c | 5 +++++ fs/Kconfig | 2 +- 2 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 5d37e461c41f..967b01ce468d 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c@@ -23,6 +23,7 @@ #include <linux/mm.h> #include <linux/vmalloc.h> #include <linux/set_memory.h> +#include <linux/hugetlb.h> #include <asm/barrier.h> #include <asm/cputype.h>
@@ -1134,6 +1135,10 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node, pmd_t *pmdp; WARN_ON((start < VMEMMAP_START) || (end > VMEMMAP_END)); + + if (is_hugetlb_free_vmemmap_enabled() && !altmap) + return vmemmap_populate_basepages(start, end, node, altmap); + do { next = pmd_addr_end(addr, end);
diff --git a/fs/Kconfig b/fs/Kconfig
index 6ce6fdac00a3..02c2d3bf1cb8 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig@@ -242,7 +242,7 @@ config HUGETLB_PAGE config HUGETLB_PAGE_FREE_VMEMMAP def_bool HUGETLB_PAGE - depends on X86_64 + depends on X86_64 || ARM64 depends on SPARSEMEM_VMEMMAP config MEMFD_CREATE
--
2.11.0
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