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Subject[PATCH 18/21] Conversion of nr_unstable to per zone counter
Subject: zoned vm counters: conversion of nr_unstable to per zone counter
From: Christoph Lameter <clameter@sgi.com>

Conversion of nr_unstable to a per zone counter

This converts the last critical page state of the VM and therefore
we need to remove several functions that were depending on
GET_PAGE_STATE_LAST in order to make the kernel compile again.
We are only left with event type counters in page state.

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

Index: linux-2.6.17-rc6-cl/drivers/base/node.c
===================================================================
--- linux-2.6.17-rc6-cl.orig/drivers/base/node.c 2006-06-12 13:03:04.914985335 -0700
+++ linux-2.6.17-rc6-cl/drivers/base/node.c 2006-06-12 13:03:17.226722868 -0700
@@ -40,13 +40,11 @@ static ssize_t node_read_meminfo(struct
int n;
int nid = dev->id;
struct sysinfo i;
- struct page_state ps;
unsigned long inactive;
unsigned long active;
unsigned long free;

si_meminfo_node(&i, nid);
- get_page_state_node(&ps, nid);
__get_zone_counts(&active, &inactive, &free, NODE_DATA(nid));


@@ -66,6 +64,7 @@ static ssize_t node_read_meminfo(struct
"Node %d Mapped: %8lu kB\n"
"Node %d Anonymous: %8lu kB\n"
"Node %d PageTables: %8lu kB\n"
+ "Node %d Unstable: %8lu kB\n"
"Node %d Slab: %8lu kB\n",
nid, K(i.totalram),
nid, K(i.freeram),
@@ -82,6 +81,7 @@ static ssize_t node_read_meminfo(struct
nid, K(node_page_state(nid, NR_MAPPED)),
nid, K(node_page_state(nid, NR_ANON)),
nid, K(node_page_state(nid, NR_PAGETABLE)),
+ nid, K(node_page_state(nid, NR_UNSTABLE)),
nid, K(node_page_state(nid, NR_SLAB)));
n += hugetlb_report_node_meminfo(nid, buf + n);
return n;
Index: linux-2.6.17-rc6-cl/fs/fs-writeback.c
===================================================================
--- linux-2.6.17-rc6-cl.orig/fs/fs-writeback.c 2006-06-12 13:02:52.204834975 -0700
+++ linux-2.6.17-rc6-cl/fs/fs-writeback.c 2006-06-12 13:03:17.227699370 -0700
@@ -473,7 +473,7 @@ void sync_inodes_sb(struct super_block *
.range_end = LLONG_MAX,
};
unsigned long nr_dirty = global_page_state(NR_DIRTY);
- unsigned long nr_unstable = read_page_state(nr_unstable);
+ unsigned long nr_unstable = global_page_state(NR_UNSTABLE);

wbc.nr_to_write = nr_dirty + nr_unstable +
(inodes_stat.nr_inodes - inodes_stat.nr_unused) +
Index: linux-2.6.17-rc6-cl/fs/nfs/write.c
===================================================================
--- linux-2.6.17-rc6-cl.orig/fs/nfs/write.c 2006-06-12 13:02:52.206787979 -0700
+++ linux-2.6.17-rc6-cl/fs/nfs/write.c 2006-06-12 13:03:17.228675872 -0700
@@ -525,7 +525,7 @@ nfs_mark_request_commit(struct nfs_page
nfs_list_add_request(req, &nfsi->commit);
nfsi->ncommit++;
spin_unlock(&nfsi->req_lock);
- inc_page_state(nr_unstable);
+ inc_zone_page_state(req->wb_page, NR_UNSTABLE);
mark_inode_dirty(inode);
}
#endif
@@ -1382,7 +1382,6 @@ static void nfs_commit_done(struct rpc_t
{
struct nfs_write_data *data = calldata;
struct nfs_page *req;
- int res = 0;

dprintk("NFS: %4d nfs_commit_done (status %d)\n",
task->tk_pid, task->tk_status);
@@ -1420,9 +1419,8 @@ static void nfs_commit_done(struct rpc_t
nfs_mark_request_dirty(req);
next:
nfs_clear_page_writeback(req);
- res++;
+ dec_zone_page_state(req->wb_page, NR_UNSTABLE);
}
- sub_page_state(nr_unstable,res);
}

static const struct rpc_call_ops nfs_commit_ops = {
Index: linux-2.6.17-rc6-cl/include/linux/mmzone.h
===================================================================
--- linux-2.6.17-rc6-cl.orig/include/linux/mmzone.h 2006-06-12 13:03:04.916938339 -0700
+++ linux-2.6.17-rc6-cl/include/linux/mmzone.h 2006-06-12 13:03:17.229652374 -0700
@@ -55,6 +55,7 @@ enum zone_stat_item {
NR_PAGETABLE, /* used for pagetables */
NR_DIRTY,
NR_WRITEBACK,
+ NR_UNSTABLE, /* NFS unstable pages */
NR_STAT_ITEMS };

struct per_cpu_pages {
Index: linux-2.6.17-rc6-cl/mm/page_alloc.c
===================================================================
--- linux-2.6.17-rc6-cl.orig/mm/page_alloc.c 2006-06-12 13:03:04.919867845 -0700
+++ linux-2.6.17-rc6-cl/mm/page_alloc.c 2006-06-12 13:03:17.231605378 -0700
@@ -1361,7 +1361,6 @@ void si_meminfo_node(struct sysinfo *val
*/
void show_free_areas(void)
{
- struct page_state ps;
int cpu, temperature;
unsigned long active;
unsigned long inactive;
@@ -1393,7 +1392,6 @@ void show_free_areas(void)
}
}

- get_page_state(&ps);
get_zone_counts(&active, &inactive, &free);

printk("Free pages: %11ukB (%ukB HighMem)\n",
@@ -1406,7 +1404,7 @@ void show_free_areas(void)
inactive,
global_page_state(NR_DIRTY),
global_page_state(NR_WRITEBACK),
- ps.nr_unstable,
+ global_page_state(NR_UNSTABLE),
nr_free_pages(),
global_page_state(NR_SLAB),
global_page_state(NR_MAPPED),
Index: linux-2.6.17-rc6-cl/mm/page-writeback.c
===================================================================
--- linux-2.6.17-rc6-cl.orig/mm/page-writeback.c 2006-06-12 13:03:04.919867845 -0700
+++ linux-2.6.17-rc6-cl/mm/page-writeback.c 2006-06-12 13:03:17.232581880 -0700
@@ -110,7 +110,7 @@ struct writeback_state
static void get_writeback_state(struct writeback_state *wbs)
{
wbs->nr_dirty = global_page_state(NR_DIRTY);
- wbs->nr_unstable = read_page_state(nr_unstable);
+ wbs->nr_unstable = global_page_state(NR_UNSTABLE);
wbs->nr_mapped = global_page_state(NR_MAPPED) +
global_page_state(NR_ANON);
wbs->nr_writeback = global_page_state(NR_WRITEBACK);
Index: linux-2.6.17-rc6-cl/fs/proc/proc_misc.c
===================================================================
--- linux-2.6.17-rc6-cl.orig/fs/proc/proc_misc.c 2006-06-12 13:03:04.915961837 -0700
+++ linux-2.6.17-rc6-cl/fs/proc/proc_misc.c 2006-06-12 13:03:17.233558382 -0700
@@ -120,7 +120,6 @@ static int meminfo_read_proc(char *page,
{
struct sysinfo i;
int len;
- struct page_state ps;
unsigned long inactive;
unsigned long active;
unsigned long free;
@@ -129,7 +128,6 @@ static int meminfo_read_proc(char *page,
struct vmalloc_info vmi;
long cached;

- get_page_state(&ps);
get_zone_counts(&active, &inactive, &free);

/*
Index: linux-2.6.17-rc6-cl/mm/vmstat.c
===================================================================
--- linux-2.6.17-rc6-cl.orig/mm/vmstat.c 2006-06-12 13:03:12.036614604 -0700
+++ linux-2.6.17-rc6-cl/mm/vmstat.c 2006-06-12 13:03:33.967873583 -0700
@@ -470,10 +470,9 @@ static char *vmstat_text[] = {
"nr_page_table_pages",
"nr_dirty",
"nr_writeback",
-
- /* Page state */
"nr_unstable",

+ /* Event counters */
"pgpgin",
"pgpgout",
"pswpin",
-
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