[S390] split page_test_and_clear_dirty.

The page_test_and_clear_dirty primitive really consists of two operations, page_test_dirty and the page_clear_dirty. The combination of the two is not an atomic operation, so it makes more sense to have two separate operations instead of one. In addition to the improved readability of the s390 version of SetPageUptodate, it now avoids the page_test_dirty operation which is an insert-storage-key-extended (iske) instruction which is an expensive operation. Signed-off-by: Martin Schwidefsky <[email protected]>
rtvt123 · Apr 27, 2007 · 6c21048 · 6c21048
1 parent 2fc2d1e
commit 6c21048
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Showing 4 changed files with 24 additions and 12 deletions.
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
@@ -139,8 +139,15 @@ static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addres
 #define pte_same(A,B)	(pte_val(A) == pte_val(B))
 #endif
 
-#ifndef __HAVE_ARCH_PAGE_TEST_AND_CLEAR_DIRTY
-#define page_test_and_clear_dirty(page) (0)
+#ifndef __HAVE_ARCH_PAGE_TEST_DIRTY
+#define page_test_dirty(page)		(0)
+#endif
+
+#ifndef __HAVE_ARCH_PAGE_CLEAR_DIRTY
+#define page_clear_dirty(page)		do { } while (0)
+#endif
+
+#ifndef __HAVE_ARCH_PAGE_TEST_DIRTY
 #define pte_maybe_dirty(pte)		pte_dirty(pte)
 #else
 #define pte_maybe_dirty(pte)		(1)

diff --git a/include/asm-s390/pgtable.h b/include/asm-s390/pgtable.h
@@ -753,14 +753,14 @@ ptep_establish(struct vm_area_struct *vma,
  * should therefore only be called if it is not mapped in any
  * address space.
  */
-static inline int page_test_and_clear_dirty(struct page *page)
+static inline int page_test_dirty(struct page *page)
 {
-	unsigned long physpage = page_to_phys(page);
-	int skey = page_get_storage_key(physpage);
+	return (page_get_storage_key(page_to_phys(page)) & _PAGE_CHANGED) != 0;
+}
 
-	if (skey & _PAGE_CHANGED)
-		page_set_storage_key(physpage, skey & ~_PAGE_CHANGED);
-	return skey & _PAGE_CHANGED;
+static inline void page_clear_dirty(struct page *page)
+{
+	page_set_storage_key(page_to_phys(page), PAGE_DEFAULT_KEY);
 }
 
 /*
@@ -953,7 +953,8 @@ extern void memmap_init(unsigned long, int, unsigned long, unsigned long);
 #define __HAVE_ARCH_PTEP_CLEAR_FLUSH
 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
 #define __HAVE_ARCH_PTE_SAME
-#define __HAVE_ARCH_PAGE_TEST_AND_CLEAR_DIRTY
+#define __HAVE_ARCH_PAGE_TEST_DIRTY
+#define __HAVE_ARCH_PAGE_CLEAR_DIRTY
 #define __HAVE_ARCH_PAGE_TEST_AND_CLEAR_YOUNG
 #include <asm-generic/pgtable.h>
 

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
@@ -133,7 +133,7 @@
 static inline void SetPageUptodate(struct page *page)
 {
 	if (!test_and_set_bit(PG_uptodate, &page->flags))
-		page_test_and_clear_dirty(page);
+		page_clear_dirty(page);
 }
 #else
 #define SetPageUptodate(page)	set_bit(PG_uptodate, &(page)->flags)

diff --git a/mm/rmap.c b/mm/rmap.c
@@ -498,8 +498,10 @@ int page_mkclean(struct page *page)
 		struct address_space *mapping = page_mapping(page);
 		if (mapping)
 			ret = page_mkclean_file(mapping, page);
-		if (page_test_and_clear_dirty(page))
+		if (page_test_dirty(page)) {
+			page_clear_dirty(page);
 			ret = 1;
+		}
 	}
 
 	return ret;
@@ -605,8 +607,10 @@ void page_remove_rmap(struct page *page, struct vm_area_struct *vma)
 		 * Leaving it set also helps swapoff to reinstate ptes
 		 * faster for those pages still in swapcache.
 		 */
-		if (page_test_and_clear_dirty(page))
+		if (page_test_dirty(page)) {
+			page_clear_dirty(page);
 			set_page_dirty(page);
+		}
 		__dec_zone_page_state(page,
 				PageAnon(page) ? NR_ANON_PAGES : NR_FILE_MAPPED);
 	}