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Date: Mon, 17 Mar 2008 02:58:30 +0100 (CET)
From: Andi Kleen <andi@...stfloor.org>
To: linux-kernel@...r.kernel.org, pj@....com, linux-mm@...ck.org,
nickpiggin@...oo.com.au
Subject: [PATCH] [16/18] Add huge pud support to hugetlbfs
Straight forward extensions for huge pages located in the PUD
instead of PMDs.
Signed-off-by: Andi Kleen <ak@...e.de>
---
arch/ia64/mm/hugetlbpage.c | 6 ++++++
arch/powerpc/mm/hugetlbpage.c | 5 +++++
arch/sh/mm/hugetlbpage.c | 5 +++++
arch/sparc64/mm/hugetlbpage.c | 5 +++++
arch/x86/mm/hugetlbpage.c | 25 ++++++++++++++++++++++++-
include/linux/hugetlb.h | 5 +++++
mm/hugetlb.c | 9 +++++++++
7 files changed, 59 insertions(+), 1 deletion(-)
Index: linux/include/linux/hugetlb.h
===================================================================
--- linux.orig/include/linux/hugetlb.h
+++ linux/include/linux/hugetlb.h
@@ -45,7 +45,10 @@ struct page *follow_huge_addr(struct mm_
int write);
struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
pmd_t *pmd, int write);
+struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
+ pud_t *pud, int write);
int pmd_huge(pmd_t pmd);
+int pud_huge(pud_t pmd);
void hugetlb_change_protection(struct vm_area_struct *vma,
unsigned long address, unsigned long end, pgprot_t newprot);
@@ -112,8 +115,10 @@ static inline unsigned long hugetlb_tota
#define hugetlb_report_meminfo(buf) 0
#define hugetlb_report_node_meminfo(n, buf) 0
#define follow_huge_pmd(mm, addr, pmd, write) NULL
+#define follow_huge_pud(mm, addr, pud, write) NULL
#define prepare_hugepage_range(addr,len) (-EINVAL)
#define pmd_huge(x) 0
+#define pud_huge(x) 0
#define is_hugepage_only_range(mm, addr, len) 0
#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
#define hugetlb_fault(mm, vma, addr, write) ({ BUG(); 0; })
Index: linux/arch/ia64/mm/hugetlbpage.c
===================================================================
--- linux.orig/arch/ia64/mm/hugetlbpage.c
+++ linux/arch/ia64/mm/hugetlbpage.c
@@ -106,6 +106,12 @@ int pmd_huge(pmd_t pmd)
{
return 0;
}
+
+int pud_huge(pud_t pud)
+{
+ return 0;
+}
+
struct page *
follow_huge_pmd(struct mm_struct *mm, unsigned long address, pmd_t *pmd, int write)
{
Index: linux/arch/powerpc/mm/hugetlbpage.c
===================================================================
--- linux.orig/arch/powerpc/mm/hugetlbpage.c
+++ linux/arch/powerpc/mm/hugetlbpage.c
@@ -368,6 +368,11 @@ int pmd_huge(pmd_t pmd)
return 0;
}
+int pud_huge(pud_t pud)
+{
+ return 0;
+}
+
struct page *
follow_huge_pmd(struct mm_struct *mm, unsigned long address,
pmd_t *pmd, int write)
Index: linux/arch/sh/mm/hugetlbpage.c
===================================================================
--- linux.orig/arch/sh/mm/hugetlbpage.c
+++ linux/arch/sh/mm/hugetlbpage.c
@@ -78,6 +78,11 @@ int pmd_huge(pmd_t pmd)
return 0;
}
+int pud_huge(pud_t pud)
+{
+ return 0;
+}
+
struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
pmd_t *pmd, int write)
{
Index: linux/arch/sparc64/mm/hugetlbpage.c
===================================================================
--- linux.orig/arch/sparc64/mm/hugetlbpage.c
+++ linux/arch/sparc64/mm/hugetlbpage.c
@@ -294,6 +294,11 @@ int pmd_huge(pmd_t pmd)
return 0;
}
+int pud_huge(pud_t pud)
+{
+ return 0;
+}
+
struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
pmd_t *pmd, int write)
{
Index: linux/arch/x86/mm/hugetlbpage.c
===================================================================
--- linux.orig/arch/x86/mm/hugetlbpage.c
+++ linux/arch/x86/mm/hugetlbpage.c
@@ -196,6 +196,11 @@ int pmd_huge(pmd_t pmd)
return 0;
}
+int pud_huge(pud_t pud)
+{
+ return 0;
+}
+
struct page *
follow_huge_pmd(struct mm_struct *mm, unsigned long address,
pmd_t *pmd, int write)
@@ -216,6 +221,11 @@ int pmd_huge(pmd_t pmd)
return !!(pmd_val(pmd) & _PAGE_PSE);
}
+int pud_huge(pud_t pud)
+{
+ return !!(pud_val(pud) & _PAGE_PSE);
+}
+
struct page *
follow_huge_pmd(struct mm_struct *mm, unsigned long address,
pmd_t *pmd, int write)
@@ -224,9 +234,22 @@ follow_huge_pmd(struct mm_struct *mm, un
page = pte_page(*(pte_t *)pmd);
if (page)
- page += ((address & ~HPAGE_MASK) >> PAGE_SHIFT);
+ page += ((address & ~PMD_MASK) >> PAGE_SHIFT);
+ return page;
+}
+
+struct page *
+follow_huge_pud(struct mm_struct *mm, unsigned long address,
+ pud_t *pud, int write)
+{
+ struct page *page;
+
+ page = pte_page(*(pte_t *)pud);
+ if (page)
+ page += ((address & ~PUD_MASK) >> PAGE_SHIFT);
return page;
}
+
#endif
/* x86_64 also uses this file */
Index: linux/mm/hugetlb.c
===================================================================
--- linux.orig/mm/hugetlb.c
+++ linux/mm/hugetlb.c
@@ -1206,6 +1206,15 @@ int hugetlb_fault(struct mm_struct *mm,
return ret;
}
+/* Can be overriden by architectures */
+__attribute__((weak)) struct page *
+follow_huge_pud(struct mm_struct *mm, unsigned long address,
+ pud_t *pud, int write)
+{
+ BUG();
+ return NULL;
+}
+
int follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
struct page **pages, struct vm_area_struct **vmas,
unsigned long *position, int *length, int i,
--
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