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Subject[PATCH 16/21] Conversion of nr_writeback to per zone counter
Subject: zoned vm counters: conversion of nr_writeback to per zone counter
From: Christoph Lameter <clameter@sgi.com>

Conversion of nr_writeback to per zone counter.

This removes the last page_state counter from arch/i386/mm/pgtable.c
so we drop the page_state from there.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>

Index: linux-2.6.17-rc6-cl/arch/i386/mm/pgtable.c
===================================================================
--- linux-2.6.17-rc6-cl.orig/arch/i386/mm/pgtable.c 2006-06-13 17:14:28.824593774 -0700
+++ linux-2.6.17-rc6-cl/arch/i386/mm/pgtable.c 2006-06-13 17:16:31.238901014 -0700
@@ -30,7 +30,6 @@ void show_mem(void)
struct page *page;
pg_data_t *pgdat;
unsigned long i;
- struct page_state ps;
unsigned long flags;

printk(KERN_INFO "Mem-info:\n");
@@ -58,9 +57,9 @@ void show_mem(void)
printk(KERN_INFO "%d pages shared\n", shared);
printk(KERN_INFO "%d pages swap cached\n", cached);

- get_page_state(&ps);
printk(KERN_INFO "%lu pages dirty\n", global_page_state(NR_DIRTY));
- printk(KERN_INFO "%lu pages writeback\n", ps.nr_writeback);
+ printk(KERN_INFO "%lu pages writeback\n",
+ global_page_state(NR_WRITEBACK));
printk(KERN_INFO "%lu pages mapped\n", global_page_state(NR_MAPPED));
printk(KERN_INFO "%lu pages slab\n", global_page_state(NR_SLAB));
printk(KERN_INFO "%lu pages pagetables\n",
Index: linux-2.6.17-rc6-cl/drivers/base/node.c
===================================================================
--- linux-2.6.17-rc6-cl.orig/drivers/base/node.c 2006-06-13 17:14:28.825570276 -0700
+++ linux-2.6.17-rc6-cl/drivers/base/node.c 2006-06-13 17:15:25.970475071 -0700
@@ -49,9 +49,6 @@ static ssize_t node_read_meminfo(struct
get_page_state_node(&ps, nid);
__get_zone_counts(&active, &inactive, &free, NODE_DATA(nid));

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

n = sprintf(buf, "\n"
"Node %d MemTotal: %8lu kB\n"
@@ -80,7 +77,7 @@ static ssize_t node_read_meminfo(struct
nid, K(i.totalram - i.totalhigh),
nid, K(i.freeram - i.freehigh),
nid, K(node_page_state(nid, NR_DIRTY)),
- nid, K(ps.nr_writeback),
+ nid, K(node_page_state(nid, NR_WRITEBACK)),
nid, K(node_page_state(nid, NR_PAGECACHE)),
nid, K(node_page_state(nid, NR_MAPPED)),
nid, K(node_page_state(nid, NR_ANON)),
Index: linux-2.6.17-rc6-cl/fs/proc/proc_misc.c
===================================================================
--- linux-2.6.17-rc6-cl.orig/fs/proc/proc_misc.c 2006-06-13 17:14:28.830452787 -0700
+++ linux-2.6.17-rc6-cl/fs/proc/proc_misc.c 2006-06-13 17:15:25.971451573 -0700
@@ -191,7 +191,7 @@ static int meminfo_read_proc(char *page,
K(i.totalswap),
K(i.freeswap),
K(global_page_state(NR_DIRTY)),
- K(ps.nr_writeback),
+ K(global_page_state(NR_WRITEBACK)),
K(global_page_state(NR_ANON)),
K(global_page_state(NR_MAPPED)),
K(global_page_state(NR_SLAB)),
Index: linux-2.6.17-rc6-cl/include/linux/mmzone.h
===================================================================
--- linux-2.6.17-rc6-cl.orig/include/linux/mmzone.h 2006-06-13 17:14:28.831429289 -0700
+++ linux-2.6.17-rc6-cl/include/linux/mmzone.h 2006-06-13 17:15:25.971451573 -0700
@@ -54,6 +54,7 @@ enum zone_stat_item {
NR_SLAB, /* Pages used by slab allocator */
NR_PAGETABLE, /* used for pagetables */
NR_DIRTY,
+ NR_WRITEBACK,
NR_VM_ZONE_STAT_ITEMS };

struct per_cpu_pages {
Index: linux-2.6.17-rc6-cl/include/linux/page-flags.h
===================================================================
--- linux-2.6.17-rc6-cl.orig/include/linux/page-flags.h 2006-06-13 17:10:38.160141749 -0700
+++ linux-2.6.17-rc6-cl/include/linux/page-flags.h 2006-06-13 17:15:25.972428075 -0700
@@ -176,7 +176,7 @@
do { \
if (!test_and_set_bit(PG_writeback, \
&(page)->flags)) \
- inc_page_state(nr_writeback); \
+ inc_zone_page_state(page, NR_WRITEBACK); \
} while (0)
#define TestSetPageWriteback(page) \
({ \
@@ -184,14 +184,14 @@
ret = test_and_set_bit(PG_writeback, \
&(page)->flags); \
if (!ret) \
- inc_page_state(nr_writeback); \
+ inc_zone_page_state(page, NR_WRITEBACK); \
ret; \
})
#define ClearPageWriteback(page) \
do { \
if (test_and_clear_bit(PG_writeback, \
&(page)->flags)) \
- dec_page_state(nr_writeback); \
+ dec_zone_page_state(page, NR_WRITEBACK); \
} while (0)
#define TestClearPageWriteback(page) \
({ \
@@ -199,7 +199,7 @@
ret = test_and_clear_bit(PG_writeback, \
&(page)->flags); \
if (ret) \
- dec_page_state(nr_writeback); \
+ dec_zone_page_state(page, NR_WRITEBACK); \
ret; \
})

Index: linux-2.6.17-rc6-cl/mm/page_alloc.c
===================================================================
--- linux-2.6.17-rc6-cl.orig/mm/page_alloc.c 2006-06-13 17:14:28.833382294 -0700
+++ linux-2.6.17-rc6-cl/mm/page_alloc.c 2006-06-13 17:15:25.974381079 -0700
@@ -1405,7 +1405,7 @@ void show_free_areas(void)
active,
inactive,
global_page_state(NR_DIRTY),
- ps.nr_writeback,
+ global_page_state(NR_WRITEBACK),
ps.nr_unstable,
nr_free_pages(),
global_page_state(NR_SLAB),
Index: linux-2.6.17-rc6-cl/mm/page-writeback.c
===================================================================
--- linux-2.6.17-rc6-cl.orig/mm/page-writeback.c 2006-06-13 17:14:28.833382294 -0700
+++ linux-2.6.17-rc6-cl/mm/page-writeback.c 2006-06-13 17:15:25.974381079 -0700
@@ -113,7 +113,7 @@ static void get_writeback_state(struct w
wbs->nr_unstable = read_page_state(nr_unstable);
wbs->nr_mapped = global_page_state(NR_MAPPED) +
global_page_state(NR_ANON);
- wbs->nr_writeback = read_page_state(nr_writeback);
+ wbs->nr_writeback = global_page_state(NR_WRITEBACK);
}

/*
Index: linux-2.6.17-rc6-cl/mm/vmstat.c
===================================================================
--- linux-2.6.17-rc6-cl.orig/mm/vmstat.c 2006-06-13 17:14:28.834358796 -0700
+++ linux-2.6.17-rc6-cl/mm/vmstat.c 2006-06-13 17:15:25.975357582 -0700
@@ -463,9 +463,9 @@ static char *vmstat_text[] = {
"nr_slab",
"nr_page_table_pages",
"nr_dirty",
+ "nr_writeback",

/* Page state */
- "nr_writeback",
"nr_unstable",

"pgpgin",
-
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