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Subject[RFC3 03/14] Convert nr_mapped
Make nr_mapped a per zone counter

nr_mapped is important because it allows a determination how many pages of a
zone are not mapped, which would allow a more efficient means of determining
when we need to reclaim memory in a zone.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

Index: linux-2.6.15-rc5-mm2/include/linux/page-flags.h
===================================================================
--- linux-2.6.15-rc5-mm2.orig/include/linux/page-flags.h 2005-12-14 14:45:40.000000000 -0800
+++ linux-2.6.15-rc5-mm2/include/linux/page-flags.h 2005-12-14 14:57:29.000000000 -0800
@@ -86,7 +86,6 @@ struct page_state {
unsigned long nr_writeback; /* Pages under writeback */
unsigned long nr_unstable; /* NFS unstable pages */
unsigned long nr_page_table_pages;/* Pages used for pagetables */
- unsigned long nr_mapped; /* mapped into pagetables */
unsigned long nr_slab; /* In slab */
#define GET_PAGE_STATE_LAST nr_slab

Index: linux-2.6.15-rc5-mm2/drivers/base/node.c
===================================================================
--- linux-2.6.15-rc5-mm2.orig/drivers/base/node.c 2005-12-03 21:10:42.000000000 -0800
+++ linux-2.6.15-rc5-mm2/drivers/base/node.c 2005-12-14 14:57:29.000000000 -0800
@@ -43,18 +43,18 @@ static ssize_t node_read_meminfo(struct
unsigned long inactive;
unsigned long active;
unsigned long free;
+ unsigned long nr_mapped;

si_meminfo_node(&i, nid);
get_page_state_node(&ps, nid);
__get_zone_counts(&active, &inactive, &free, NODE_DATA(nid));
+ nr_mapped = node_page_state(nid, NR_MAPPED);

/* Check for negative values in these approximate counters */
if ((long)ps.nr_dirty < 0)
ps.nr_dirty = 0;
if ((long)ps.nr_writeback < 0)
ps.nr_writeback = 0;
- if ((long)ps.nr_mapped < 0)
- ps.nr_mapped = 0;
if ((long)ps.nr_slab < 0)
ps.nr_slab = 0;

@@ -83,7 +83,7 @@ static ssize_t node_read_meminfo(struct
nid, K(i.freeram - i.freehigh),
nid, K(ps.nr_dirty),
nid, K(ps.nr_writeback),
- nid, K(ps.nr_mapped),
+ nid, K(nr_mapped),
nid, K(ps.nr_slab));
n += hugetlb_report_node_meminfo(nid, buf + n);
return n;
Index: linux-2.6.15-rc5-mm2/fs/proc/proc_misc.c
===================================================================
--- linux-2.6.15-rc5-mm2.orig/fs/proc/proc_misc.c 2005-12-12 09:10:33.000000000 -0800
+++ linux-2.6.15-rc5-mm2/fs/proc/proc_misc.c 2005-12-14 14:57:29.000000000 -0800
@@ -190,7 +190,7 @@ static int meminfo_read_proc(char *page,
K(i.freeswap),
K(ps.nr_dirty),
K(ps.nr_writeback),
- K(ps.nr_mapped),
+ K(global_page_state(NR_MAPPED)),
K(ps.nr_slab),
K(allowed),
K(committed),
Index: linux-2.6.15-rc5-mm2/mm/vmscan.c
===================================================================
--- linux-2.6.15-rc5-mm2.orig/mm/vmscan.c 2005-12-13 20:41:05.000000000 -0800
+++ linux-2.6.15-rc5-mm2/mm/vmscan.c 2005-12-14 14:57:29.000000000 -0800
@@ -1429,7 +1429,7 @@ int try_to_free_pages(struct zone **zone
}

for (priority = DEF_PRIORITY; priority >= 0; priority--) {
- sc.nr_mapped = read_page_state(nr_mapped);
+ sc.nr_mapped = global_page_state(NR_MAPPED);
sc.nr_scanned = 0;
sc.nr_reclaimed = 0;
sc.priority = priority;
@@ -1517,7 +1517,7 @@ loop_again:
total_reclaimed = 0;
sc.gfp_mask = GFP_KERNEL;
sc.may_writepage = 0;
- sc.nr_mapped = read_page_state(nr_mapped);
+ sc.nr_mapped = global_page_state(NR_MAPPED);

inc_page_state(pageoutrun);

Index: linux-2.6.15-rc5-mm2/mm/page-writeback.c
===================================================================
--- linux-2.6.15-rc5-mm2.orig/mm/page-writeback.c 2005-12-12 09:10:34.000000000 -0800
+++ linux-2.6.15-rc5-mm2/mm/page-writeback.c 2005-12-14 14:57:29.000000000 -0800
@@ -111,7 +111,7 @@ static void get_writeback_state(struct w
{
wbs->nr_dirty = read_page_state(nr_dirty);
wbs->nr_unstable = read_page_state(nr_unstable);
- wbs->nr_mapped = read_page_state(nr_mapped);
+ wbs->nr_mapped = global_page_state(NR_MAPPED);
wbs->nr_writeback = read_page_state(nr_writeback);
}

Index: linux-2.6.15-rc5-mm2/mm/page_alloc.c
===================================================================
--- linux-2.6.15-rc5-mm2.orig/mm/page_alloc.c 2005-12-14 14:57:22.000000000 -0800
+++ linux-2.6.15-rc5-mm2/mm/page_alloc.c 2005-12-14 14:57:29.000000000 -0800
@@ -1784,7 +1784,7 @@ void show_free_areas(void)
ps.nr_unstable,
nr_free_pages(),
ps.nr_slab,
- ps.nr_mapped,
+ global_page_state(NR_MAPPED),
ps.nr_page_table_pages);

for_each_zone(zone) {
Index: linux-2.6.15-rc5-mm2/mm/rmap.c
===================================================================
--- linux-2.6.15-rc5-mm2.orig/mm/rmap.c 2005-12-14 10:54:05.000000000 -0800
+++ linux-2.6.15-rc5-mm2/mm/rmap.c 2005-12-14 14:57:29.000000000 -0800
@@ -473,7 +473,7 @@ static void __page_set_anon_rmap(struct

page->index = linear_page_index(vma, address);

- inc_page_state(nr_mapped);
+ inc_zone_page_state(page, NR_MAPPED);
}

/**
@@ -520,7 +520,7 @@ void page_add_file_rmap(struct page *pag
BUG_ON(!pfn_valid(page_to_pfn(page)));

if (atomic_inc_and_test(&page->_mapcount))
- inc_page_state(nr_mapped);
+ inc_zone_page_state(page, NR_MAPPED);
}

/**
@@ -544,7 +544,7 @@ void page_remove_rmap(struct page *page)
*/
if (page_test_and_clear_dirty(page))
set_page_dirty(page);
- dec_page_state(nr_mapped);
+ dec_zone_page_state(page, NR_MAPPED);
}
}

Index: linux-2.6.15-rc5-mm2/mm/swap_prefetch.c
===================================================================
--- linux-2.6.15-rc5-mm2.orig/mm/swap_prefetch.c 2005-12-12 09:10:34.000000000 -0800
+++ linux-2.6.15-rc5-mm2/mm/swap_prefetch.c 2005-12-14 14:57:29.000000000 -0800
@@ -327,7 +327,7 @@ static int prefetch_suitable(void)
* >2/3 of the ram is mapped or swapcache, we need some free for
* pagecache
*/
- limit = ps.nr_mapped + ps.nr_slab + pending_writes +
+ limit = global_page_state(NR_MAPPED) + ps.nr_slab + pending_writes +
total_swapcache_pages;
if (limit > mapped_limit)
goto out;
Index: linux-2.6.15-rc5-mm2/include/linux/mmzone.h
===================================================================
--- linux-2.6.15-rc5-mm2.orig/include/linux/mmzone.h 2005-12-14 14:46:34.000000000 -0800
+++ linux-2.6.15-rc5-mm2/include/linux/mmzone.h 2005-12-14 14:57:29.000000000 -0800
@@ -44,8 +44,8 @@ struct zone_padding {
#define ZONE_PADDING(name)
#endif

-enum zone_stat_item { };
-#define NR_STAT_ITEMS 0
+enum zone_stat_item { NR_MAPPED };
+#define NR_STAT_ITEMS 1

struct per_cpu_pages {
int count; /* number of pages in the list */
-
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