thp: optimize away unnecessary page table locking

Currently when we check if we can handle thp as it is or we need to split
it into regular sized pages, we hold page table lock prior to check
whether a given pmd is mapping thp or not.  Because of this, when it's not
"huge pmd" we suffer from unnecessary lock/unlock overhead.  To remove it,
this patch introduces a optimized check function and replace several
similar logics with it.

[akpm@linux-foundation.org: checkpatch fixes]
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/proc/task_mmu.c

@@ -394,21 +394,12 @@ static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
 	pte_t *pte;
 	spinlock_t *ptl;
 
-	spin_lock(&walk->mm->page_table_lock);
-	if (pmd_trans_huge(*pmd)) {
-		if (pmd_trans_splitting(*pmd)) {
-			spin_unlock(&walk->mm->page_table_lock);
-			wait_split_huge_page(vma->anon_vma, pmd);
-		} else {
-			smaps_pte_entry(*(pte_t *)pmd, addr,
-					HPAGE_PMD_SIZE, walk);
+	if (pmd_trans_huge_lock(pmd, vma) == 1) {
+		smaps_pte_entry(*(pte_t *)pmd, addr, HPAGE_PMD_SIZE, walk);
 		spin_unlock(&walk->mm->page_table_lock);
 		mss->anonymous_thp += HPAGE_PMD_SIZE;
 		return 0;
 	}
-	} else {
-		spin_unlock(&walk->mm->page_table_lock);
-	}
 
 	if (pmd_trans_unstable(pmd))
 		return 0;
@@ -705,11 +696,7 @@ static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
 	/* find the first VMA at or above 'addr' */
 	vma = find_vma(walk->mm, addr);
 	spin_lock(&walk->mm->page_table_lock);
-	if (pmd_trans_huge(*pmd)) {
-		if (pmd_trans_splitting(*pmd)) {
-			spin_unlock(&walk->mm->page_table_lock);
-			wait_split_huge_page(vma->anon_vma, pmd);
-		} else {
+	if (pmd_trans_huge_lock(pmd, vma) == 1) {
 		for (; addr != end; addr += PAGE_SIZE) {
 			unsigned long offset;
 
@@ -723,9 +710,6 @@ static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
 		spin_unlock(&walk->mm->page_table_lock);
 		return err;
 	}
-	} else {
-		spin_unlock(&walk->mm->page_table_lock);
-	}
 
 	for (; addr != end; addr += PAGE_SIZE) {
 
@@ -992,12 +976,8 @@ static int gather_pte_stats(pmd_t *pmd, unsigned long addr,
 	pte_t *pte;
 
 	md = walk->private;
-	spin_lock(&walk->mm->page_table_lock);
-	if (pmd_trans_huge(*pmd)) {
-		if (pmd_trans_splitting(*pmd)) {
-			spin_unlock(&walk->mm->page_table_lock);
-			wait_split_huge_page(md->vma->anon_vma, pmd);
-		} else {
+
+	if (pmd_trans_huge_lock(pmd, md->vma) == 1) {
 		pte_t huge_pte = *(pte_t *)pmd;
 		struct page *page;
 
@@ -1008,9 +988,6 @@ static int gather_pte_stats(pmd_t *pmd, unsigned long addr,
 		spin_unlock(&walk->mm->page_table_lock);
 		return 0;
 	}
-	} else {
-		spin_unlock(&walk->mm->page_table_lock);
-	}
 
 	if (pmd_trans_unstable(pmd))
 		return 0;

include/linux/huge_mm.h

@@ -113,6 +113,18 @@ extern void __vma_adjust_trans_huge(struct vm_area_struct *vma,
 				    unsigned long start,
 				    unsigned long end,
 				    long adjust_next);
+extern int __pmd_trans_huge_lock(pmd_t *pmd,
+				 struct vm_area_struct *vma);
+/* mmap_sem must be held on entry */
+static inline int pmd_trans_huge_lock(pmd_t *pmd,
+				      struct vm_area_struct *vma)
+{
+	VM_BUG_ON(!rwsem_is_locked(&vma->vm_mm->mmap_sem));
+	if (pmd_trans_huge(*pmd))
+		return __pmd_trans_huge_lock(pmd, vma);
+	else
+		return 0;
+}
 static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
 					 unsigned long start,
 					 unsigned long end,
@@ -176,6 +188,11 @@ static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
 					 long adjust_next)
 {
 }
+static inline int pmd_trans_huge_lock(pmd_t *pmd,
+				      struct vm_area_struct *vma)
+{
+	return 0;
+}
 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 
 #endif /* _LINUX_HUGE_MM_H */

mm/huge_memory.c

@@ -1031,13 +1031,7 @@ int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
 {
 	int ret = 0;
 
-	spin_lock(&tlb->mm->page_table_lock);
-	if (likely(pmd_trans_huge(*pmd))) {
-		if (unlikely(pmd_trans_splitting(*pmd))) {
-			spin_unlock(&tlb->mm->page_table_lock);
-			wait_split_huge_page(vma->anon_vma,
-					     pmd);
-		} else {
+	if (__pmd_trans_huge_lock(pmd, vma) == 1) {
 		struct page *page;
 		pgtable_t pgtable;
 		pgtable = get_pmd_huge_pte(tlb->mm);
@@ -1054,9 +1048,6 @@ int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
 		pte_free(tlb->mm, pgtable);
 		ret = 1;
 	}
-	} else
-		spin_unlock(&tlb->mm->page_table_lock);
-
 	return ret;
 }
 
@@ -1066,21 +1057,15 @@ int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
 {
 	int ret = 0;
 
-	spin_lock(&vma->vm_mm->page_table_lock);
-	if (likely(pmd_trans_huge(*pmd))) {
-		ret = !pmd_trans_splitting(*pmd);
-		spin_unlock(&vma->vm_mm->page_table_lock);
-		if (unlikely(!ret))
-			wait_split_huge_page(vma->anon_vma, pmd);
-		else {
+	if (__pmd_trans_huge_lock(pmd, vma) == 1) {
 		/*
 		 * All logical pages in the range are present
 		 * if backed by a huge page.
 		 */
+		spin_unlock(&vma->vm_mm->page_table_lock);
 		memset(vec, 1, (end - addr) >> PAGE_SHIFT);
+		ret = 1;
 	}
-	} else
-		spin_unlock(&vma->vm_mm->page_table_lock);
 
 	return ret;
 }
@@ -1110,21 +1095,12 @@ int move_huge_pmd(struct vm_area_struct *vma, struct vm_area_struct *new_vma,
 		goto out;
 	}
 
-	spin_lock(&mm->page_table_lock);
-	if (likely(pmd_trans_huge(*old_pmd))) {
-		if (pmd_trans_splitting(*old_pmd)) {
-			spin_unlock(&mm->page_table_lock);
-			wait_split_huge_page(vma->anon_vma, old_pmd);
-			ret = -1;
-		} else {
+	ret = __pmd_trans_huge_lock(old_pmd, vma);
+	if (ret == 1) {
 		pmd = pmdp_get_and_clear(mm, old_addr, old_pmd);
 		VM_BUG_ON(!pmd_none(*new_pmd));
 		set_pmd_at(mm, new_addr, new_pmd, pmd);
 		spin_unlock(&mm->page_table_lock);
-			ret = 1;
-		}
-	} else {
-		spin_unlock(&mm->page_table_lock);
 	}
 out:
 	return ret;
@@ -1136,26 +1112,43 @@ int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
 	struct mm_struct *mm = vma->vm_mm;
 	int ret = 0;
 
-	spin_lock(&mm->page_table_lock);
-	if (likely(pmd_trans_huge(*pmd))) {
-		if (unlikely(pmd_trans_splitting(*pmd))) {
-			spin_unlock(&mm->page_table_lock);
-			wait_split_huge_page(vma->anon_vma, pmd);
-		} else {
+	if (__pmd_trans_huge_lock(pmd, vma) == 1) {
 		pmd_t entry;
-
 		entry = pmdp_get_and_clear(mm, addr, pmd);
 		entry = pmd_modify(entry, newprot);
 		set_pmd_at(mm, addr, pmd, entry);
 		spin_unlock(&vma->vm_mm->page_table_lock);
 		ret = 1;
 	}
-	} else
-		spin_unlock(&vma->vm_mm->page_table_lock);
 
 	return ret;
 }
 
+/*
+ * Returns 1 if a given pmd maps a stable (not under splitting) thp.
+ * Returns -1 if it maps a thp under splitting. Returns 0 otherwise.
+ *
+ * Note that if it returns 1, this routine returns without unlocking page
+ * table locks. So callers must unlock them.
+ */
+int __pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma)
+{
+	spin_lock(&vma->vm_mm->page_table_lock);
+	if (likely(pmd_trans_huge(*pmd))) {
+		if (unlikely(pmd_trans_splitting(*pmd))) {
+			spin_unlock(&vma->vm_mm->page_table_lock);
+			wait_split_huge_page(vma->anon_vma, pmd);
+			return -1;
+		} else {
+			/* Thp mapped by 'pmd' is stable, so we can
+			 * handle it as it is. */
+			return 1;
+		}
+	}
+	spin_unlock(&vma->vm_mm->page_table_lock);
+	return 0;
+}
+
 pmd_t *page_check_address_pmd(struct page *page,
 			      struct mm_struct *mm,
 			      unsigned long address,