From: David Rientjes <rientjes@google.com>
Date: Tue, 13 Dec 2016 00:42:20 +0000 (-0800)
Subject: mm, thp: avoid unlikely branches for split_huge_pmd
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=fd60775aea802beef444881ddfa111a4b73b1bbc;p=linux-beck.git

mm, thp: avoid unlikely branches for split_huge_pmd

While doing MADV_DONTNEED on a large area of thp memory, I noticed we
encountered many unlikely() branches in profiles for each backing
hugepage.  This is because zap_pmd_range() would call split_huge_pmd(),
which rechecked the conditions that were already validated, but as part
of an unlikely() branch.

Avoid the unlikely() branch when in a context where pmd is known to be
good for __split_huge_pmd() directly.

Link: http://lkml.kernel.org/r/alpine.DEB.2.10.1610181600300.84525@chino.kir.corp.google.com
Signed-off-by: David Rientjes <rientjes@google.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index e35e6de633b9..1f782aa1d8e6 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -189,6 +189,8 @@ static inline void deferred_split_huge_page(struct page *page) {}
 #define split_huge_pmd(__vma, __pmd, __address)	\
 	do { } while (0)
 
+static inline void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
+		unsigned long address, bool freeze, struct page *page) {}
 static inline void split_huge_pmd_address(struct vm_area_struct *vma,
 		unsigned long address, bool freeze, struct page *page) {}
 
diff --git a/mm/memory.c b/mm/memory.c
index 33f45edf8272..d86b7b4afd7d 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1240,7 +1240,7 @@ static inline unsigned long zap_pmd_range(struct mmu_gather *tlb,
 			if (next - addr != HPAGE_PMD_SIZE) {
 				VM_BUG_ON_VMA(vma_is_anonymous(vma) &&
 				    !rwsem_is_locked(&tlb->mm->mmap_sem), vma);
-				split_huge_pmd(vma, pmd, addr);
+				__split_huge_pmd(vma, pmd, addr, false, NULL);
 			} else if (zap_huge_pmd(tlb, vma, pmd, addr))
 				goto next;
 			/* fall through */
@@ -3454,7 +3454,7 @@ static int wp_huge_pmd(struct fault_env *fe, pmd_t orig_pmd)
 
 	/* COW handled on pte level: split pmd */
 	VM_BUG_ON_VMA(fe->vma->vm_flags & VM_SHARED, fe->vma);
-	split_huge_pmd(fe->vma, fe->pmd, fe->address);
+	__split_huge_pmd(fe->vma, fe->pmd, fe->address, false, NULL);
 
 	return VM_FAULT_FALLBACK;
 }
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 0b859af06b87..a6a27e5d6b14 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -496,7 +496,7 @@ static int queue_pages_pte_range(pmd_t *pmd, unsigned long addr,
 			page = pmd_page(*pmd);
 			if (is_huge_zero_page(page)) {
 				spin_unlock(ptl);
-				split_huge_pmd(vma, pmd, addr);
+				__split_huge_pmd(vma, pmd, addr, false, NULL);
 			} else {
 				get_page(page);
 				spin_unlock(ptl);
diff --git a/mm/mprotect.c b/mm/mprotect.c
index 05a02b72c98d..c5ba2aae0f54 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -176,7 +176,7 @@ static inline unsigned long change_pmd_range(struct vm_area_struct *vma,
 
 		if (pmd_trans_huge(*pmd) || pmd_devmap(*pmd)) {
 			if (next - addr != HPAGE_PMD_SIZE) {
-				split_huge_pmd(vma, pmd, addr);
+				__split_huge_pmd(vma, pmd, addr, false, NULL);
 				if (pmd_trans_unstable(pmd))
 					continue;
 			} else {