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Subject[PATCH, RFC 6/9] thp: add address parameter to split_huge_page_pmd()
Date
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>

It's required to implement huge zero pmd splitting.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
Documentation/vm/transhuge.txt | 4 ++--
arch/x86/kernel/vm86_32.c | 2 +-
fs/proc/task_mmu.c | 2 +-
include/linux/huge_mm.h | 10 ++++++----
mm/huge_memory.c | 5 +++--
mm/memory.c | 4 ++--
mm/mempolicy.c | 2 +-
mm/mprotect.c | 2 +-
mm/mremap.c | 3 ++-
mm/pagewalk.c | 2 +-
10 files changed, 20 insertions(+), 16 deletions(-)
diff --git a/Documentation/vm/transhuge.txt b/Documentation/vm/transhuge.txt
index f734bb2..b1fe2ca 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(mm, pmd, addr) 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(mm, pmd, addr);
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 255f58a..719ba0c 100644
--- a/arch/x86/kernel/vm86_32.c
+++ b/arch/x86/kernel/vm86_32.c
@@ -180,7 +180,7 @@ 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, pmd, 0xA0000);
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 4540b8f..27c1827 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -597,7 +597,7 @@ 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(walk->mm, pmd, addr);
if (pmd_trans_unstable(pmd))
return 0;

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 4c59b11..ce91199 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -92,12 +92,14 @@ 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 mm_struct *mm, pmd_t *pmd,
+ unsigned long address);
+#define split_huge_page_pmd(__mm, __pmd, __address) \
do { \
pmd_t *____pmd = (__pmd); \
if (unlikely(pmd_trans_huge(*____pmd))) \
- __split_huge_page_pmd(__mm, ____pmd); \
+ __split_huge_page_pmd(__mm, ____pmd, \
+ __address); \
} while (0)
#define wait_split_huge_page(__anon_vma, __pmd) \
do { \
@@ -174,7 +176,7 @@ static inline int split_huge_page(struct page *page)
{
return 0;
}
-#define split_huge_page_pmd(__mm, __pmd) \
+#define split_huge_page_pmd(__mm, __pmd, __address) \
do { } while (0)
#define wait_split_huge_page(__anon_vma, __pmd) \
do { } while (0)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 4001f1a..c8948d6 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2503,7 +2503,8 @@ 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 mm_struct *mm, pmd_t *pmd,
+ unsigned long address)
{
struct page *page;

@@ -2547,7 +2548,7 @@ 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, pmd, address);
}

void __vma_adjust_trans_huge(struct vm_area_struct *vma,
diff --git a/mm/memory.c b/mm/memory.c
index c281847..e202392 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1227,7 +1227,7 @@ 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->vm_mm, pmd, addr);
} else if (zap_huge_pmd(tlb, vma, pmd, addr))
goto next;
/* fall through */
@@ -1493,7 +1493,7 @@ 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(mm, pmd, address);
goto split_fallthrough;
}
spin_lock(&mm->page_table_lock);
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 1d771e4..44c818d 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->vm_mm, pmd, addr);
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 a409926..e85e29d 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->vm_mm, pmd, addr);
else if (change_huge_pmd(vma, pmd, addr, newprot))
continue;
/* fall through */
diff --git a/mm/mremap.c b/mm/mremap.c
index 21fed20..790df47 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -156,7 +156,8 @@ 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->vm_mm, old_pmd,
+ old_addr);
}
VM_BUG_ON(pmd_trans_huge(*old_pmd));
}
diff --git a/mm/pagewalk.c b/mm/pagewalk.c
index 6c118d0..7e92ebd 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(walk->mm, pmd, addr);
if (pmd_none_or_trans_huge_or_clear_bad(pmd))
goto again;
err = walk_pte_range(pmd, addr, next, walk);
--
1.7.7.6


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