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Subject[PATCH 13/21] Conversion of nr_dirty to per zone counter
Subject: zoned vm counters: conversion of nr_dirty to per zone counter
From: Christoph Lameter <clameter@sgi.com>

This makes nr_dirty a per zone counter. Looping over all processors is
avoided during writeback state determination.

The counter aggregation for nr_dirty had to be undone in the NFS layer since
we summed up the page counts from multiple zones.

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 2006-06-12 13:02:33.254836674 -0700
+++ linux-2.6.17-rc6-cl/arch/i386/mm/pgtable.c 2006-06-12 13:02:52.201905469 -0700
@@ -59,7 +59,7 @@ void show_mem(void)
printk(KERN_INFO "%d pages swap cached\n", cached);

get_page_state(&ps);
- printk(KERN_INFO "%lu pages dirty\n", ps.nr_dirty);
+ 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 mapped\n", global_page_state(NR_MAPPED));
printk(KERN_INFO "%lu pages slab\n", global_page_state(NR_SLAB));
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 13:02:33.261672188 -0700
+++ linux-2.6.17-rc6-cl/drivers/base/node.c 2006-06-12 13:02:52.202881971 -0700
@@ -50,8 +50,6 @@ static ssize_t node_read_meminfo(struct
__get_zone_counts(&active, &inactive, &free, NODE_DATA(nid));

/* 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;

@@ -81,7 +79,7 @@ static ssize_t node_read_meminfo(struct
nid, K(i.freehigh),
nid, K(i.totalram - i.totalhigh),
nid, K(i.freeram - i.freehigh),
- nid, K(ps.nr_dirty),
+ nid, K(node_page_state(nid, NR_DIRTY)),
nid, K(ps.nr_writeback),
nid, K(node_page_state(nid, NR_PAGECACHE)),
nid, K(node_page_state(nid, NR_MAPPED)),
Index: linux-2.6.17-rc6-cl/fs/buffer.c
===================================================================
--- linux-2.6.17-rc6-cl.orig/fs/buffer.c 2006-06-12 12:42:47.348762564 -0700
+++ linux-2.6.17-rc6-cl/fs/buffer.c 2006-06-12 13:02:52.204834975 -0700
@@ -854,7 +854,7 @@ int __set_page_dirty_buffers(struct page
write_lock_irq(&mapping->tree_lock);
if (page->mapping) { /* Race with truncate? */
if (mapping_cap_account_dirty(mapping))
- inc_page_state(nr_dirty);
+ __inc_zone_page_state(page, NR_DIRTY);
radix_tree_tag_set(&mapping->page_tree,
page_index(page),
PAGECACHE_TAG_DIRTY);
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 12:42:47.502073390 -0700
+++ linux-2.6.17-rc6-cl/fs/fs-writeback.c 2006-06-12 13:02:52.204834975 -0700
@@ -472,7 +472,7 @@ void sync_inodes_sb(struct super_block *
.range_start = 0,
.range_end = LLONG_MAX,
};
- unsigned long nr_dirty = read_page_state(nr_dirty);
+ unsigned long nr_dirty = global_page_state(NR_DIRTY);
unsigned long nr_unstable = read_page_state(nr_unstable);

wbc.nr_to_write = nr_dirty + nr_unstable +
Index: linux-2.6.17-rc6-cl/fs/nfs/pagelist.c
===================================================================
--- linux-2.6.17-rc6-cl.orig/fs/nfs/pagelist.c 2006-06-05 17:57:02.000000000 -0700
+++ linux-2.6.17-rc6-cl/fs/nfs/pagelist.c 2006-06-12 13:02:52.205811477 -0700
@@ -315,6 +315,7 @@ nfs_scan_lock_dirty(struct nfs_inode *nf
req->wb_index, NFS_PAGE_TAG_DIRTY);
nfs_list_remove_request(req);
nfs_list_add_request(req, dst);
+ inc_zone_page_state(req->wb_page, NR_DIRTY);
res++;
}
}
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 12:42:48.111410682 -0700
+++ linux-2.6.17-rc6-cl/fs/nfs/write.c 2006-06-12 13:02:52.206787979 -0700
@@ -497,7 +497,7 @@ nfs_mark_request_dirty(struct nfs_page *
nfs_list_add_request(req, &nfsi->dirty);
nfsi->ndirty++;
spin_unlock(&nfsi->req_lock);
- inc_page_state(nr_dirty);
+ inc_zone_page_state(req->wb_page, NR_DIRTY);
mark_inode_dirty(inode);
}

@@ -598,7 +598,6 @@ nfs_scan_dirty(struct inode *inode, stru
if (nfsi->ndirty != 0) {
res = nfs_scan_lock_dirty(nfsi, dst, idx_start, npages);
nfsi->ndirty -= res;
- sub_page_state(nr_dirty,res);
if ((nfsi->ndirty == 0) != list_empty(&nfsi->dirty))
printk(KERN_ERR "NFS: desynchronized value of nfs_i.ndirty.\n");
}
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 13:02:33.256789678 -0700
+++ linux-2.6.17-rc6-cl/fs/proc/proc_misc.c 2006-06-12 13:02:52.207764481 -0700
@@ -190,7 +190,7 @@ static int meminfo_read_proc(char *page,
K(i.freeram-i.freehigh),
K(i.totalswap),
K(i.freeswap),
- K(ps.nr_dirty),
+ K(global_page_state(NR_DIRTY)),
K(ps.nr_writeback),
K(global_page_state(NR_ANON)),
K(global_page_state(NR_MAPPED)),
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 13:02:33.257766180 -0700
+++ linux-2.6.17-rc6-cl/include/linux/mmzone.h 2006-06-12 13:02:52.209717485 -0700
@@ -53,6 +53,7 @@ enum zone_stat_item {
NR_PAGECACHE,
NR_SLAB, /* Pages used by slab allocator */
NR_PAGETABLE, /* used for pagetables */
+ NR_DIRTY,
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 13:02:33.260695686 -0700
+++ linux-2.6.17-rc6-cl/mm/page_alloc.c 2006-06-12 13:02:52.210693987 -0700
@@ -1404,7 +1404,7 @@ void show_free_areas(void)
"unstable:%lu free:%u slab:%lu mapped:%lu pagetables:%lu\n",
active,
inactive,
- ps.nr_dirty,
+ global_page_state(NR_DIRTY),
ps.nr_writeback,
ps.nr_unstable,
nr_free_pages(),
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 13:01:30.625902765 -0700
+++ linux-2.6.17-rc6-cl/mm/page-writeback.c 2006-06-12 13:02:52.211670489 -0700
@@ -109,7 +109,7 @@ struct writeback_state

static void get_writeback_state(struct writeback_state *wbs)
{
- wbs->nr_dirty = read_page_state(nr_dirty);
+ wbs->nr_dirty = global_page_state(NR_DIRTY);
wbs->nr_unstable = read_page_state(nr_unstable);
wbs->nr_mapped = global_page_state(NR_MAPPED) +
global_page_state(NR_ANON);
@@ -641,7 +641,7 @@ int __set_page_dirty_nobuffers(struct pa
if (mapping2) { /* Race with truncate? */
BUG_ON(mapping2 != mapping);
if (mapping_cap_account_dirty(mapping))
- inc_page_state(nr_dirty);
+ __inc_zone_page_state(page, NR_DIRTY);
radix_tree_tag_set(&mapping->page_tree,
page_index(page), PAGECACHE_TAG_DIRTY);
}
@@ -728,9 +728,9 @@ int test_clear_page_dirty(struct page *p
radix_tree_tag_clear(&mapping->page_tree,
page_index(page),
PAGECACHE_TAG_DIRTY);
- write_unlock_irqrestore(&mapping->tree_lock, flags);
if (mapping_cap_account_dirty(mapping))
- dec_page_state(nr_dirty);
+ __dec_zone_page_state(page, NR_DIRTY);
+ write_unlock_irqrestore(&mapping->tree_lock, flags);
return 1;
}
write_unlock_irqrestore(&mapping->tree_lock, flags);
@@ -761,7 +761,7 @@ int clear_page_dirty_for_io(struct page
if (mapping) {
if (TestClearPageDirty(page)) {
if (mapping_cap_account_dirty(mapping))
- dec_page_state(nr_dirty);
+ dec_zone_page_state(page, NR_DIRTY);
return 1;
}
return 0;
Index: linux-2.6.17-rc6-cl/mm/vmstat.c
===================================================================
--- linux-2.6.17-rc6-cl.orig/mm/vmstat.c 2006-06-12 13:02:46.391718420 -0700
+++ linux-2.6.17-rc6-cl/mm/vmstat.c 2006-06-12 13:02:58.922192406 -0700
@@ -468,9 +468,9 @@ static char *vmstat_text[] = {
"nr_anon",
"nr_slab",
"nr_page_table_pages",
+ "nr_dirty",

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

-
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