| Message ID | 20200915125947.26204-8-songmuchun@bytedance.com (mailing list archive) |
|---|---|
| State | New, archived |
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From: Muchun Song <songmuchun@bytedance.com>
To: corbet@lwn.net,
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Cc: linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org,
linux-mm@kvack.org,
linux-fsdevel@vger.kernel.org,
Muchun Song <songmuchun@bytedance.com>
Subject: [RFC PATCH 07/24] mm/hugetlb: Add freeing unused vmemmap pages
support for x86
Date: Tue, 15 Sep 2020 20:59:30 +0800
Message-Id: <20200915125947.26204-8-songmuchun@bytedance.com>
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|
| Series |
mm/hugetlb: Free some vmemmap pages of hugetlb page
|
expand
|
diff --git a/arch/x86/include/asm/hugetlb.h b/arch/x86/include/asm/hugetlb.h index 1721b1aadeb1..f5e882f999cd 100644 --- a/arch/x86/include/asm/hugetlb.h +++ b/arch/x86/include/asm/hugetlb.h @@ -5,6 +5,11 @@ #include <asm/page.h> #include <asm-generic/hugetlb.h> +#ifdef CONFIG_HUGETLB_PAGE_FREE_VMEMMAP +#define VMEMMAP_HPAGE_SHIFT PMD_SHIFT +#define arch_vmemmap_support_huge_mapping() boot_cpu_has(X86_FEATURE_PSE) +#endif + #define hugepages_supported() boot_cpu_has(X86_FEATURE_PSE) #endif /* _ASM_X86_HUGETLB_H */
On x86_64 architecture, we use hupe page mapping vmemmap area. We should define VMEMMAP_HPAGE_SHIFT to the correct value to support freeing unused vmemmap pages. Signed-off-by: Muchun Song <songmuchun@bytedance.com> --- arch/x86/include/asm/hugetlb.h | 5 +++++ 1 file changed, 5 insertions(+)