[PATCH] 2.5.41: lkcd (4/8): add in use for page alloc/free

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This adds in-use tag for dump ordering capabilities (so
that pages in use are dumped first).

 include/linux/page-flags.h | 5 +++++
 mm/page_alloc.c | 23 ++++++++++++++++++++++-
 2 files changed, 27 insertions(+), 1 deletion(-)

diff -Naur linux-2.5.41.orig/include/linux/page-flags.h linux-2.5.41.lkcd/include/linux/page-flags.h
--- linux-2.5.41.orig/include/linux/page-flags.h Mon Oct 7 11:24:45 2002
+++ linux-2.5.41.lkcd/include/linux/page-flags.h Tue Oct 8 01:15:13 2002
@@ -69,6 +69,7 @@
 
 #define PG_direct 16 /* ->pte_chain points directly at pte */
 
+#define PG_inuse 17
 /*
  * Global page accounting. One instance per CPU. Only unsigned longs are
  * allowed.
@@ -228,6 +229,10 @@
 #define ClearPageDirect(page) clear_bit(PG_direct, &(page)->flags)
 #define TestClearPageDirect(page) test_and_clear_bit(PG_direct, &(page)->flags)
 
+#define PageInuse(page) test_bit(PG_inuse, &(page)->flags)
+#define SetPageInuse(page) __set_bit(PG_inuse, &(page)->flags)
+#define ClearPageInuse(page) __clear_bit(PG_inuse, &(page)->flags)
+
 /*
  * The PageSwapCache predicate doesn't use a PG_flag at this time,
  * but it may again do so one day.
diff -Naur linux-2.5.41.orig/mm/page_alloc.c linux-2.5.41.lkcd/mm/page_alloc.c
--- linux-2.5.41.orig/mm/page_alloc.c Mon Oct 7 11:23:24 2002
+++ linux-2.5.41.lkcd/mm/page_alloc.c Tue Oct 8 01:15:13 2002
@@ -86,6 +86,14 @@
         struct free_area *area;
         struct page *base;
         struct zone *zone;
+ unsigned int i;
+
+ i = 1UL << order;
+ page += i;
+ do {
+ page--;
+ ClearPageInuse(page);
+ } while (--i);
 
         mod_page_state(pgfree, 1<<order);
 
@@ -207,7 +215,7 @@
                 curr = head->next;
 
                 if (curr != head) {
- unsigned int index;
+ unsigned int index, i;
 
                         page = list_entry(curr, struct page, list);
                         BUG_ON(bad_range(zone, page));
@@ -222,6 +230,12 @@
 
                         if (bad_range(zone, page))
                                 BUG();
+ i = 1UL << order;
+ page += i;
+ do {
+ page--;
+ SetPageInuse(page);
+ } while (--i);
                         prep_new_page(page);
                         return page;
                 }
@@ -277,6 +291,7 @@
                 struct list_head * entry, * local_pages;
                 struct page * tmp;
                 int nr_pages;
+ unsigned int i;
 
                 local_pages = &current->local_pages;
 
@@ -289,6 +304,12 @@
                                         list_del(entry);
                                         page = tmp;
                                         current->nr_local_pages--;
+ i = 1UL << order;
+ page = tmp + i;
+ do {
+ page--;
+ SetPageInuse(page);
+ } while (--i);
                                         prep_new_page(page);
                                         break;
                                 }
-
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