[PATCH] [28/34] i386: pte xchg optimization

[Andi Kleen]

From: Zachary Amsden <zach@xxxxxxxxxx>

In situations where page table updates need only be made locally, and there is
no cross-processor A/D bit races involved, we need not use the heavyweight
xchg instruction to atomically fetch and clear page table entries.  Instead,
we can just read and clear them directly.

This introduces a neat optimization for non-SMP kernels; drop the atomic xchg
operations from page table updates.

Thanks to Michel Lespinasse for noting this potential optimization.

Signed-off-by: Zachary Amsden <zach@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andi Kleen <ak@xxxxxxx>

---

 include/asm-i386/pgtable-2level.h |   14 ++++++++++++++
 include/asm-i386/pgtable-3level.h |   14 ++++++++++++++
 2 files changed, 28 insertions(+)

Index: linux/include/asm-i386/pgtable-2level.h
===================================================================
--- linux.orig/include/asm-i386/pgtable-2level.h
+++ linux/include/asm-i386/pgtable-2level.h
@@ -41,10 +41,24 @@ static inline void native_pte_clear(stru
 	*xp = __pte(0);
 }
 
+/* local pte updates need not use xchg for locking */
+static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
+{
+	pte_t res;
+
+	res = *ptep;
+	native_pte_clear(NULL, 0, ptep);
+	return res;
+}
+
+#ifdef CONFIG_SMP
 static inline pte_t native_ptep_get_and_clear(pte_t *xp)
 {
 	return __pte(xchg(&xp->pte_low, 0));
 }
+#else
+#define native_ptep_get_and_clear(xp) native_local_ptep_get_and_clear(xp)
+#endif
 
 #define pte_page(x)		pfn_to_page(pte_pfn(x))
 #define pte_none(x)		(!(x).pte_low)
Index: linux/include/asm-i386/pgtable-3level.h
===================================================================
--- linux.orig/include/asm-i386/pgtable-3level.h
+++ linux/include/asm-i386/pgtable-3level.h
@@ -139,6 +139,17 @@ static inline void pud_clear (pud_t * pu
 #define pmd_offset(pud, address) ((pmd_t *) pud_page(*(pud)) + \
 			pmd_index(address))
 
+/* local pte updates need not use xchg for locking */
+static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
+{
+	pte_t res;
+
+	res = *ptep;
+	native_pte_clear(NULL, 0, ptep);
+	return res;
+}
+
+#ifdef CONFIG_SMP
 static inline pte_t native_ptep_get_and_clear(pte_t *ptep)
 {
 	pte_t res;
@@ -150,6 +161,9 @@ static inline pte_t native_ptep_get_and_
 
 	return res;
 }
+#else
+#define native_ptep_get_and_clear(xp) native_local_ptep_get_and_clear(xp)
+#endif
 
 #define __HAVE_ARCH_PTE_SAME
 static inline int pte_same(pte_t a, pte_t b)
-
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