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Subject[oom]: [3/4] track wired pages on a per-zone basis
Date
Index: linux-2.6.7/include/linux/mmzone.h
===================================================================
--- linux-2.6.7.orig/include/linux/mmzone.h 2004-06-16 05:19:36.000000000 +0000
+++ linux-2.6.7/include/linux/mmzone.h 2004-06-23 18:58:13.000000000 +0000
@@ -170,6 +170,7 @@
ZONE_PADDING(_pad3_)

struct per_cpu_pageset pageset[NR_CPUS];
+ unsigned long nr_wired[NR_CPUS];

/*
* Discontig memory support fields.
Index: linux-2.6.7/include/linux/page-flags.h
===================================================================
--- linux-2.6.7.orig/include/linux/page-flags.h 2004-06-23 18:57:13.000000000 +0000
+++ linux-2.6.7/include/linux/page-flags.h 2004-06-23 18:58:21.000000000 +0000
@@ -322,6 +322,8 @@
int __clear_page_dirty(struct page *page);
int test_clear_page_writeback(struct page *page);
int test_set_page_writeback(struct page *page);
+void set_page_wired(struct page *);
+void clear_page_wired(struct page *);

static inline void clear_page_dirty(struct page *page)
{
@@ -333,16 +335,4 @@
test_set_page_writeback(page);
}

-static inline void set_page_wired(struct page *page)
-{
- SetPageWired(page);
- inc_page_state(nr_wired);
-}
-
-static inline void clear_page_wired(struct page *page)
-{
- ClearPageWired(page);
- dec_page_state(nr_wired);
-}
-
#endif /* PAGE_FLAGS_H */
Index: linux-2.6.7/include/linux/mm_inline.h
===================================================================
--- linux-2.6.7.orig/include/linux/mm_inline.h 2004-06-16 05:20:26.000000000 +0000
+++ linux-2.6.7/include/linux/mm_inline.h 2004-06-23 18:58:13.000000000 +0000
@@ -30,11 +30,13 @@
static inline void
del_page_from_lru(struct zone *zone, struct page *page)
{
- list_del(&page->lru);
- if (PageActive(page)) {
- ClearPageActive(page);
- zone->nr_active--;
- } else {
- zone->nr_inactive--;
+ if (!PageWired(page)) {
+ list_del(&page->lru);
+ if (!PageActive(page))
+ zone->nr_inactive--;
+ else {
+ ClearPageActive(page);
+ zone->nr_active--;
+ }
}
}
Index: linux-2.6.7/mm/swap.c
===================================================================
--- linux-2.6.7.orig/mm/swap.c 2004-06-16 05:19:13.000000000 +0000
+++ linux-2.6.7/mm/swap.c 2004-06-23 18:58:50.000000000 +0000
@@ -54,6 +54,34 @@
EXPORT_SYMBOL(put_page);
#endif

+void set_page_wired(struct page *page)
+{
+ unsigned long flags;
+ int cpu;
+ struct zone *zone = page_zone(page);
+
+ SetPageWired(page);
+ local_irq_save(flags);
+ cpu = smp_processor_id();
+ per_cpu(page_states, cpu).nr_wired++;
+ zone->nr_wired[cpu]++;
+ local_irq_restore(flags);
+}
+
+void clear_page_wired(struct page *page)
+{
+ unsigned long flags;
+ int cpu;
+ struct zone *zone = page_zone(page);
+
+ ClearPageWired(page);
+ local_irq_save(flags);
+ cpu = smp_processor_id();
+ per_cpu(page_states, cpu).nr_wired--;
+ zone->nr_wired[cpu]--;
+ local_irq_restore(flags);
+}
+
/*
* Writeback is about to end against a page which has been marked for immediate
* reclaim. If it still appears to be reclaimable, move it to the tail of the
@@ -101,8 +129,11 @@
*/
void fastcall activate_page(struct page *page)
{
- struct zone *zone = page_zone(page);
+ struct zone *zone;

+ if (PageWired(page))
+ return;
+ zone = page_zone(page);
spin_lock_irq(&zone->lru_lock);
if (PageLRU(page) && !PageActive(page)) {
del_page_from_inactive_list(zone, page);
@@ -122,12 +153,13 @@
*/
void fastcall mark_page_accessed(struct page *page)
{
+ if (PageWired(page))
+ return;
if (!PageActive(page) && PageReferenced(page) && PageLRU(page)) {
activate_page(page);
ClearPageReferenced(page);
- } else if (!PageReferenced(page)) {
+ } else if (!PageReferenced(page))
SetPageReferenced(page);
- }
}

EXPORT_SYMBOL(mark_page_accessed);
@@ -144,7 +176,7 @@
struct pagevec *pvec = &get_cpu_var(lru_add_pvecs);

page_cache_get(page);
- if (!pagevec_add(pvec, page))
+ if (!PageWired(page) && !pagevec_add(pvec, page))
__pagevec_lru_add(pvec);
put_cpu_var(lru_add_pvecs);
}
@@ -154,7 +186,7 @@
struct pagevec *pvec = &get_cpu_var(lru_add_active_pvecs);

page_cache_get(page);
- if (!pagevec_add(pvec, page))
+ if (!PageWired(page) && !pagevec_add(pvec, page))
__pagevec_lru_add_active(pvec);
put_cpu_var(lru_add_active_pvecs);
}
Index: linux-2.6.7/mm/page_alloc.c
===================================================================
--- linux-2.6.7.orig/mm/page_alloc.c 2004-06-23 18:57:50.000000000 +0000
+++ linux-2.6.7/mm/page_alloc.c 2004-06-23 18:58:13.000000000 +0000
@@ -1066,9 +1066,7 @@
{
struct page_state ps;
int cpu, temperature;
- unsigned long active;
- unsigned long inactive;
- unsigned long free;
+ unsigned long active, inactive, free, wired;
struct zone *zone;

for_each_zone(zone) {
@@ -1122,6 +1120,8 @@
int i;

show_node(zone);
+ for (wired = cpu = 0; cpu < NR_CPUS; ++cpu)
+ wired += zone->nr_wired[cpu];
printk("%s"
" free:%lukB"
" min:%lukB"
@@ -1130,6 +1130,7 @@
" active:%lukB"
" inactive:%lukB"
" present:%lukB"
+ " wired:%lukB"
"\n",
zone->name,
K(zone->free_pages),
@@ -1138,7 +1139,8 @@
K(zone->pages_high),
K(zone->nr_active),
K(zone->nr_inactive),
- K(zone->present_pages)
+ K(zone->present_pages),
+ K(wired)
);
printk("protections[]:");
for (i = 0; i < MAX_NR_ZONES; i++)
@@ -1662,8 +1664,8 @@
pg_data_t *pgdat = (pg_data_t *)arg;
struct zone *zone;
struct zone *node_zones = pgdat->node_zones;
- unsigned long flags;
- int order;
+ unsigned long wired, flags;
+ int order, cpu;

for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) {
if (!zone->present_pages)
@@ -1681,6 +1683,11 @@
}
spin_unlock_irqrestore(&zone->lock, flags);
seq_putc(m, '\n');
+ for (wired = cpu = 0; cpu < NR_CPUS; ++cpu)
+ wired += zone->nr_wired[cpu];
+ wired >>= PAGE_SHIFT - 10;
+ seq_printf(m, "Node %d, zone %8s wired: %lu kB\n",
+ pgdat->node_id, zone->name, wired);
}
return 0;
}
-
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