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Subject[PATCH 07/14] Conversion of nr_slab to per zone counter
Conversion of nr_slab to a per zone counter

- Allows reclaim to access counter without looping over processor counts.

- Allows accurate statistics on how many pages are used in a zone by
the slab. This may become useful to balance slab allocations over
various zones.

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

Index: linux-2.6.17-rc6-mm1/drivers/base/node.c
===================================================================
--- linux-2.6.17-rc6-mm1.orig/drivers/base/node.c 2006-06-08 15:45:42.633134614 -0700
+++ linux-2.6.17-rc6-mm1/drivers/base/node.c 2006-06-08 15:45:44.040274043 -0700
@@ -58,8 +58,6 @@ 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"
@@ -89,7 +87,7 @@ static ssize_t node_read_meminfo(struct
nid, K(ps.nr_writeback),
nid, K(nr[NR_MAPPED]),
nid, K(nr[NR_PAGECACHE]),
- nid, K(ps.nr_slab));
+ nid, K(nr[NR_SLAB]));
n += hugetlb_report_node_meminfo(nid, buf + n);
return n;
}
Index: linux-2.6.17-rc6-mm1/fs/proc/proc_misc.c
===================================================================
--- linux-2.6.17-rc6-mm1.orig/fs/proc/proc_misc.c 2006-06-08 15:45:25.571691103 -0700
+++ linux-2.6.17-rc6-mm1/fs/proc/proc_misc.c 2006-06-08 15:45:44.041250545 -0700
@@ -191,7 +191,7 @@ static int meminfo_read_proc(char *page,
K(ps.nr_dirty),
K(ps.nr_writeback),
K(global_page_state(NR_MAPPED)),
- K(ps.nr_slab),
+ K(global_page_state(NR_SLAB)),
K(allowed),
K(committed),
K(ps.nr_page_table_pages),
Index: linux-2.6.17-rc6-mm1/mm/page_alloc.c
===================================================================
--- linux-2.6.17-rc6-mm1.orig/mm/page_alloc.c 2006-06-08 15:45:42.636064120 -0700
+++ linux-2.6.17-rc6-mm1/mm/page_alloc.c 2006-06-08 15:45:44.043203549 -0700
@@ -628,7 +628,7 @@ static int rmqueue_bulk(struct zone *zon
return i;
}

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

/*
* Manage combined zone based / global counters
@@ -1810,7 +1810,7 @@ void show_free_areas(void)
ps.nr_writeback,
ps.nr_unstable,
nr_free_pages(),
- ps.nr_slab,
+ global_page_state(NR_SLAB),
global_page_state(NR_MAPPED),
ps.nr_page_table_pages);

@@ -2804,13 +2804,13 @@ static char *vmstat_text[] = {
/* Zoned VM counters */
"nr_mapped",
"nr_pagecache",
+ "nr_slab",

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

"pgpgin",
"pgpgout",
Index: linux-2.6.17-rc6-mm1/mm/slab.c
===================================================================
--- linux-2.6.17-rc6-mm1.orig/mm/slab.c 2006-06-08 15:42:25.210789203 -0700
+++ linux-2.6.17-rc6-mm1/mm/slab.c 2006-06-08 15:45:44.046133055 -0700
@@ -1525,7 +1525,7 @@ static void *kmem_getpages(struct kmem_c
nr_pages = (1 << cachep->gfporder);
if (cachep->flags & SLAB_RECLAIM_ACCOUNT)
atomic_add(nr_pages, &slab_reclaim_pages);
- add_page_state(nr_slab, nr_pages);
+ add_zone_page_state(page_zone(page), NR_SLAB, nr_pages);
for (i = 0; i < nr_pages; i++)
__SetPageSlab(page + i);
return page_address(page);
@@ -1545,7 +1545,7 @@ static void kmem_freepages(struct kmem_c
__ClearPageSlab(page);
page++;
}
- sub_page_state(nr_slab, nr_freed);
+ sub_zone_page_state(page_zone(page), NR_SLAB, nr_freed);
if (current->reclaim_state)
current->reclaim_state->reclaimed_slab += nr_freed;
free_pages((unsigned long)addr, cachep->gfporder);
Index: linux-2.6.17-rc6-mm1/include/linux/mmzone.h
===================================================================
--- linux-2.6.17-rc6-mm1.orig/include/linux/mmzone.h 2006-06-08 15:45:41.276773291 -0700
+++ linux-2.6.17-rc6-mm1/include/linux/mmzone.h 2006-06-08 15:45:44.046133055 -0700
@@ -50,6 +50,7 @@ enum zone_stat_item {
NR_MAPPED, /* mapped into pagetables.
only modified from process context */
NR_PAGECACHE, /* file backed pages */
+ NR_SLAB, /* used by slab allocator */
NR_STAT_ITEMS };

#ifdef CONFIG_SMP
Index: linux-2.6.17-rc6-mm1/include/linux/page-flags.h
===================================================================
--- linux-2.6.17-rc6-mm1.orig/include/linux/page-flags.h 2006-06-08 15:44:58.896585082 -0700
+++ linux-2.6.17-rc6-mm1/include/linux/page-flags.h 2006-06-08 15:45:44.047109557 -0700
@@ -123,8 +123,7 @@ 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_slab; /* In slab */
-#define GET_PAGE_STATE_LAST nr_slab
+#define GET_PAGE_STATE_LAST nr_page_table_pages

/*
* The below are zeroed by get_page_state(). Use get_full_page_state()
Index: linux-2.6.17-rc6-mm1/mm/swap_prefetch.c
===================================================================
--- linux-2.6.17-rc6-mm1.orig/mm/swap_prefetch.c 2006-06-08 15:44:58.896585082 -0700
+++ linux-2.6.17-rc6-mm1/mm/swap_prefetch.c 2006-06-08 15:45:44.048086059 -0700
@@ -394,7 +394,9 @@ static int prefetch_suitable(void)
* even if the slab is being allocated on a remote node. This
* would be expensive to fix and not of great significance.
*/
- limit = global_page_state(NR_MAPPED) + ps.nr_slab + ps.nr_dirty +
+ limit = global_page_state(NR_MAPPED) +
+ global_page_state(NR_SLAB) +
+ ps.nr_dirty +
ps.nr_unstable + total_swapcache_pages;
if (limit > ns->prefetch_watermark) {
node_clear(node, sp_stat.prefetch_nodes);
Index: linux-2.6.17-rc6-mm1/mm/vmscan.c
===================================================================
--- linux-2.6.17-rc6-mm1.orig/mm/vmscan.c 2006-06-08 15:45:41.273843785 -0700
+++ linux-2.6.17-rc6-mm1/mm/vmscan.c 2006-06-08 15:45:44.049062561 -0700
@@ -1375,7 +1375,7 @@ unsigned long shrink_all_memory(unsigned
for_each_zone(zone)
lru_pages += zone->nr_active + zone->nr_inactive;

- nr_slab = read_page_state(nr_slab);
+ nr_slab = global_page_state(NR_SLAB);
/* If slab caches are huge, it's better to hit them first */
while (nr_slab >= lru_pages) {
reclaim_state.reclaimed_slab = 0;
Index: linux-2.6.17-rc6-mm1/arch/i386/mm/pgtable.c
===================================================================
--- linux-2.6.17-rc6-mm1.orig/arch/i386/mm/pgtable.c 2006-06-08 15:45:17.903220642 -0700
+++ linux-2.6.17-rc6-mm1/arch/i386/mm/pgtable.c 2006-06-08 15:46:08.094448609 -0700
@@ -62,7 +62,7 @@ void show_mem(void)
printk(KERN_INFO "%lu pages dirty\n", ps.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", ps.nr_slab);
+ printk(KERN_INFO "%lu pages slab\n", global_page_state(NR_SLAB));
printk(KERN_INFO "%lu pages pagetables\n", ps.nr_page_table_pages);
}

-
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