[PATCH 3/9] clockpro-PG_test.patch


From: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>

Introduce a new PG_flag, needed for the clockpro work.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>

include/linux/page-flags.h | 8 ++++++++
mm/page_alloc.c | 3 ++-
2 files changed, 10 insertions(+), 1 deletion(-)

Index: linux-2.6-git/include/linux/page-flags.h
===================================================================
--- linux-2.6-git.orig/include/linux/page-flags.h
+++ linux-2.6-git/include/linux/page-flags.h
@@ -76,6 +76,8 @@
#define PG_nosave_free 18 /* Free, should not be written */
#define PG_uncached 19 /* Page has been mapped as uncached */

+#define PG_test 20 /* Page is in its test period */
+
/*
* Global page accounting. One instance per CPU. Only unsigned longs are
* allowed.
@@ -303,6 +305,12 @@ extern void __mod_page_state(unsigned lo
#define SetPageUncached(page) set_bit(PG_uncached, &(page)->flags)
#define ClearPageUncached(page) clear_bit(PG_uncached, &(page)->flags)

+#define PageTest(page) test_bit(PG_test, &(page)->flags)
+#define SetPageTest(page) set_bit(PG_test, &(page)->flags)
+#define TestSetPageTest(page) test_and_set_bit(PG_test, &(page)->flags)
+#define ClearPageTest(page) clear_bit(PG_test, &(page)->flags)
+#define TestClearPageTest(page) test_and_clear_bit(PG_test, &(page)->flags)
+
struct page; /* forward declaration */

int test_clear_page_dirty(struct page *page);
Index: linux-2.6-git/mm/page_alloc.c
===================================================================
--- linux-2.6-git.orig/mm/page_alloc.c
+++ linux-2.6-git/mm/page_alloc.c
@@ -499,7 +499,8 @@ static int prep_new_page(struct page *pa

page->flags &= ~(1 << PG_uptodate | 1 << PG_error |
1 << PG_referenced | 1 << PG_arch_1 |
- 1 << PG_checked | 1 << PG_mappedtodisk);
+ 1 << PG_checked | 1 << PG_mappedtodisk |
+ 1 << PG_test);
set_page_private(page, 0);
set_page_refs(page, order);
kernel_map_pages(page, 1 << order, 1);
-
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