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authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2012-12-12 13:50:59 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-12 17:38:31 -0800
commite180377f1ae48b3cbc559c9875d9b038f7f000c6 (patch)
treec51e0db181acc0372479bce5cd68b99abca7d8bb
parentcad7f613c4d010e1d0f05c9a4fb33c7ae40ba115 (diff)
downloadlinaro-lsk-e180377f1ae48b3cbc559c9875d9b038f7f000c6.tar.gz
thp: change split_huge_page_pmd() interface
Pass vma instead of mm and add address parameter. In most cases we already have vma on the stack. We provides split_huge_page_pmd_mm() for few cases when we have mm, but not vma. This change is preparation to huge zero pmd splitting implementation. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: "H. Peter Anvin" <hpa@linux.intel.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--Documentation/vm/transhuge.txt4
-rw-r--r--arch/x86/kernel/vm86_32.c2
-rw-r--r--fs/proc/task_mmu.c2
-rw-r--r--include/linux/huge_mm.h14
-rw-r--r--mm/huge_memory.c19
-rw-r--r--mm/memory.c4
-rw-r--r--mm/mempolicy.c2
-rw-r--r--mm/mprotect.c2
-rw-r--r--mm/mremap.c2
-rw-r--r--mm/pagewalk.c2
10 files changed, 37 insertions, 16 deletions
diff --git a/Documentation/vm/transhuge.txt b/Documentation/vm/transhuge.txt
index f734bb2a78d..8f5b41db314 100644
--- a/Documentation/vm/transhuge.txt
+++ b/Documentation/vm/transhuge.txt
@@ -276,7 +276,7 @@ unaffected. libhugetlbfs will also work fine as usual.
== Graceful fallback ==
Code walking pagetables but unware about huge pmds can simply call
-split_huge_page_pmd(mm, pmd) where the pmd is the one returned by
+split_huge_page_pmd(vma, addr, pmd) where the pmd is the one returned by
pmd_offset. It's trivial to make the code transparent hugepage aware
by just grepping for "pmd_offset" and adding split_huge_page_pmd where
missing after pmd_offset returns the pmd. Thanks to the graceful
@@ -299,7 +299,7 @@ diff --git a/mm/mremap.c b/mm/mremap.c
return NULL;
pmd = pmd_offset(pud, addr);
-+ split_huge_page_pmd(mm, pmd);
++ split_huge_page_pmd(vma, addr, pmd);
if (pmd_none_or_clear_bad(pmd))
return NULL;
diff --git a/arch/x86/kernel/vm86_32.c b/arch/x86/kernel/vm86_32.c
index 5c9687b1bde..1dfe69cc78a 100644
--- a/arch/x86/kernel/vm86_32.c
+++ b/arch/x86/kernel/vm86_32.c
@@ -182,7 +182,7 @@ static void mark_screen_rdonly(struct mm_struct *mm)
if (pud_none_or_clear_bad(pud))
goto out;
pmd = pmd_offset(pud, 0xA0000);
- split_huge_page_pmd(mm, pmd);
+ split_huge_page_pmd_mm(mm, 0xA0000, pmd);
if (pmd_none_or_clear_bad(pmd))
goto out;
pte = pte_offset_map_lock(mm, pmd, 0xA0000, &ptl);
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 90c63f9392a..291a0d15a0b 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -643,7 +643,7 @@ static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr,
spinlock_t *ptl;
struct page *page;
- split_huge_page_pmd(walk->mm, pmd);
+ split_huge_page_pmd(vma, addr, pmd);
if (pmd_trans_unstable(pmd))
return 0;
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 1af47755245..3132ea78858 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -95,12 +95,14 @@ extern int handle_pte_fault(struct mm_struct *mm,
struct vm_area_struct *vma, unsigned long address,
pte_t *pte, pmd_t *pmd, unsigned int flags);
extern int split_huge_page(struct page *page);
-extern void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd);
-#define split_huge_page_pmd(__mm, __pmd) \
+extern void __split_huge_page_pmd(struct vm_area_struct *vma,
+ unsigned long address, pmd_t *pmd);
+#define split_huge_page_pmd(__vma, __address, __pmd) \
do { \
pmd_t *____pmd = (__pmd); \
if (unlikely(pmd_trans_huge(*____pmd))) \
- __split_huge_page_pmd(__mm, ____pmd); \
+ __split_huge_page_pmd(__vma, __address, \
+ ____pmd); \
} while (0)
#define wait_split_huge_page(__anon_vma, __pmd) \
do { \
@@ -110,6 +112,8 @@ extern void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd);
BUG_ON(pmd_trans_splitting(*____pmd) || \
pmd_trans_huge(*____pmd)); \
} while (0)
+extern void split_huge_page_pmd_mm(struct mm_struct *mm, unsigned long address,
+ pmd_t *pmd);
#if HPAGE_PMD_ORDER > MAX_ORDER
#error "hugepages can't be allocated by the buddy allocator"
#endif
@@ -177,10 +181,12 @@ static inline int split_huge_page(struct page *page)
{
return 0;
}
-#define split_huge_page_pmd(__mm, __pmd) \
+#define split_huge_page_pmd(__vma, __address, __pmd) \
do { } while (0)
#define wait_split_huge_page(__anon_vma, __pmd) \
do { } while (0)
+#define split_huge_page_pmd_mm(__mm, __address, __pmd) \
+ do { } while (0)
#define compound_trans_head(page) compound_head(page)
static inline int hugepage_madvise(struct vm_area_struct *vma,
unsigned long *vm_flags, int advice)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 7742fb36eb4..de6aa5f3fdd 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2475,9 +2475,14 @@ static int khugepaged(void *none)
return 0;
}
-void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd)
+void __split_huge_page_pmd(struct vm_area_struct *vma, unsigned long address,
+ pmd_t *pmd)
{
struct page *page;
+ unsigned long haddr = address & HPAGE_PMD_MASK;
+ struct mm_struct *mm = vma->vm_mm;
+
+ BUG_ON(vma->vm_start > haddr || vma->vm_end < haddr + HPAGE_PMD_SIZE);
spin_lock(&mm->page_table_lock);
if (unlikely(!pmd_trans_huge(*pmd))) {
@@ -2495,6 +2500,16 @@ void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd)
BUG_ON(pmd_trans_huge(*pmd));
}
+void split_huge_page_pmd_mm(struct mm_struct *mm, unsigned long address,
+ pmd_t *pmd)
+{
+ struct vm_area_struct *vma;
+
+ vma = find_vma(mm, address);
+ BUG_ON(vma == NULL);
+ split_huge_page_pmd(vma, address, pmd);
+}
+
static void split_huge_page_address(struct mm_struct *mm,
unsigned long address)
{
@@ -2509,7 +2524,7 @@ static void split_huge_page_address(struct mm_struct *mm,
* Caller holds the mmap_sem write mode, so a huge pmd cannot
* materialize from under us.
*/
- split_huge_page_pmd(mm, pmd);
+ split_huge_page_pmd_mm(mm, address, pmd);
}
void __vma_adjust_trans_huge(struct vm_area_struct *vma,
diff --git a/mm/memory.c b/mm/memory.c
index 259b34fe134..f9a4b0cb862 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1243,7 +1243,7 @@ static inline unsigned long zap_pmd_range(struct mmu_gather *tlb,
BUG();
}
#endif
- split_huge_page_pmd(vma->vm_mm, pmd);
+ split_huge_page_pmd(vma, addr, pmd);
} else if (zap_huge_pmd(tlb, vma, pmd, addr))
goto next;
/* fall through */
@@ -1512,7 +1512,7 @@ struct page *follow_page(struct vm_area_struct *vma, unsigned long address,
}
if (pmd_trans_huge(*pmd)) {
if (flags & FOLL_SPLIT) {
- split_huge_page_pmd(mm, pmd);
+ split_huge_page_pmd(vma, address, pmd);
goto split_fallthrough;
}
spin_lock(&mm->page_table_lock);
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 05b28361a39..0719e8dd494 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -511,7 +511,7 @@ static inline int check_pmd_range(struct vm_area_struct *vma, pud_t *pud,
pmd = pmd_offset(pud, addr);
do {
next = pmd_addr_end(addr, end);
- split_huge_page_pmd(vma->vm_mm, pmd);
+ split_huge_page_pmd(vma, addr, pmd);
if (pmd_none_or_trans_huge_or_clear_bad(pmd))
continue;
if (check_pte_range(vma, pmd, addr, next, nodes,
diff --git a/mm/mprotect.c b/mm/mprotect.c
index a40992610ab..e8c3938db6f 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -90,7 +90,7 @@ static inline void change_pmd_range(struct vm_area_struct *vma, pud_t *pud,
next = pmd_addr_end(addr, end);
if (pmd_trans_huge(*pmd)) {
if (next - addr != HPAGE_PMD_SIZE)
- split_huge_page_pmd(vma->vm_mm, pmd);
+ split_huge_page_pmd(vma, addr, pmd);
else if (change_huge_pmd(vma, pmd, addr, newprot))
continue;
/* fall through */
diff --git a/mm/mremap.c b/mm/mremap.c
index 1b61c2d3307..eabb24da6c9 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -182,7 +182,7 @@ unsigned long move_page_tables(struct vm_area_struct *vma,
need_flush = true;
continue;
} else if (!err) {
- split_huge_page_pmd(vma->vm_mm, old_pmd);
+ split_huge_page_pmd(vma, old_addr, old_pmd);
}
VM_BUG_ON(pmd_trans_huge(*old_pmd));
}
diff --git a/mm/pagewalk.c b/mm/pagewalk.c
index 6c118d012bb..35aa294656c 100644
--- a/mm/pagewalk.c
+++ b/mm/pagewalk.c
@@ -58,7 +58,7 @@ again:
if (!walk->pte_entry)
continue;
- split_huge_page_pmd(walk->mm, pmd);
+ split_huge_page_pmd_mm(walk->mm, addr, pmd);
if (pmd_none_or_trans_huge_or_clear_bad(pmd))
goto again;
err = walk_pte_range(pmd, addr, next, walk);