[RFC3 09/14] Convert nr_page_table

Christoph Lameter
2005-12-15T00:15:01Z

The nr_page_table_pages counter is currently implemented as a counter
split per cpu. nr_page_table_pages has therefore currently meaning as a
counter of the page table pages in the system as a whole.

This patch switches the counter to use a zone based couter. It is then
possible to determine how many pages in a zone are used for page tables.

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

Index: linux-2.6.15-rc5-mm2/mm/memory.c
===================================================================
--- linux-2.6.15-rc5-mm2.orig/mm/memory.c 2005-12-13 15:46:52.000000000 -0800
+++ linux-2.6.15-rc5-mm2/mm/memory.c 2005-12-14 15:29:46.000000000 -0800
@@ -116,7 +116,7 @@ static void free_pte_range(struct mmu_ga
pmd_clear(pmd);
pte_lock_deinit(page);
pte_free_tlb(tlb, page);
- dec_page_state(nr_page_table_pages);
+ dec_zone_page_state(page, NR_PAGETABLE);
tlb->mm->nr_ptes--;
}

@@ -302,7 +302,7 @@ int __pte_alloc(struct mm_struct *mm, pm
pte_free(new);
} else {
mm->nr_ptes++;
- inc_page_state(nr_page_table_pages);
+ inc_zone_page_state(new, NR_PAGETABLE);
pmd_populate(mm, pmd, new);
}
spin_unlock(&mm->page_table_lock);
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 15:29:13.000000000 -0800
+++ linux-2.6.15-rc5-mm2/mm/page_alloc.c 2005-12-14 15:29:46.000000000 -0800
@@ -596,7 +596,7 @@ static int rmqueue_bulk(struct zone *zon
return i;
}

-char *stat_item_descr[NR_STAT_ITEMS] = { "mapped","pagecache", "slab" };
+char *stat_item_descr[NR_STAT_ITEMS] = { "mapped","pagecache", "slab", "pagetable" };

/*
* Manage combined zone based / global counters
@@ -1783,7 +1783,7 @@ void show_free_areas(void)
nr_free_pages(),
global_page_state(NR_SLAB),
global_page_state(NR_MAPPED),
- ps.nr_page_table_pages);
+ global_page_state(NR_PAGETABLE));

for_each_zone(zone) {
int i;
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 15:29:13.000000000 -0800
+++ linux-2.6.15-rc5-mm2/include/linux/page-flags.h 2005-12-14 15:29:46.000000000 -0800
@@ -85,8 +85,7 @@ struct page_state {
unsigned long nr_dirty; /* Dirty writeable pages */
unsigned long nr_writeback; /* Pages under writeback */
unsigned long nr_unstable; /* NFS unstable pages */
- unsigned long nr_page_table_pages;/* Pages used for pagetables */
-#define GET_PAGE_STATE_LAST nr_page_table_pages
+#define GET_PAGE_STATE_LAST nr_unstable

/*
* The below are zeroed by get_page_state(). Use get_full_page_state()
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 15:29:13.000000000 -0800
+++ linux-2.6.15-rc5-mm2/include/linux/mmzone.h 2005-12-14 15:29:46.000000000 -0800
@@ -44,8 +44,8 @@ struct zone_padding {
#define ZONE_PADDING(name)
#endif

-enum zone_stat_item { NR_MAPPED, NR_PAGECACHE, NR_SLAB };
-#define NR_STAT_ITEMS 3
+enum zone_stat_item { NR_MAPPED, NR_PAGECACHE, NR_SLAB, NR_PAGETABLE };
+#define NR_STAT_ITEMS 4

struct per_cpu_pages {
int count; /* number of pages in the list */
Index: linux-2.6.15-rc5-mm2/fs/proc/proc_misc.c
===================================================================
--- linux-2.6.15-rc5-mm2.orig/fs/proc/proc_misc.c 2005-12-14 15:29:13.000000000 -0800
+++ linux-2.6.15-rc5-mm2/fs/proc/proc_misc.c 2005-12-14 15:29:46.000000000 -0800
@@ -194,7 +194,7 @@ static int meminfo_read_proc(char *page,
K(global_page_state(NR_SLAB)),
K(allowed),
K(committed),
- K(ps.nr_page_table_pages),
+ K(global_page_state(NR_PAGETABLE)),
(unsigned long)VMALLOC_TOTAL >> 10,
vmi.used >> 10,
vmi.largest_chunk >> 10
Index: linux-2.6.15-rc5-mm2/drivers/base/node.c
===================================================================
--- linux-2.6.15-rc5-mm2.orig/drivers/base/node.c 2005-12-14 15:29:13.000000000 -0800
+++ linux-2.6.15-rc5-mm2/drivers/base/node.c 2005-12-14 15:29:46.000000000 -0800
@@ -57,8 +57,6 @@ static ssize_t node_read_meminfo(struct
ps.nr_dirty = 0;
if ((long)ps.nr_writeback < 0)
ps.nr_writeback = 0;
- if ((long)ps.nr_slab < 0)
- ps.nr_slab = 0;

n = sprintf(buf, "\n"
"Node %d MemTotal: %8lu kB\n"