This patch is to initialize wait table and zonelists for new pgdat.
When new node is added, free_area_init_node() is called to initialize
pgdat. But, wait table must be allocated by kmalloc (not bootmem) for it.
And, zonelists is accessed from any other process every time,
So, stop_machine_run() is used for safety update.
Signed-off-by: Dave Hansen <[email protected]>
Signed-off-by: Hiroyuki Kamezawa <[email protected]>
Signed-off-by: Yasunori Goto <[email protected]>
Index: pgdat3/mm/page_alloc.c
===================================================================
--- pgdat3.orig/mm/page_alloc.c 2006-02-17 16:52:50.000000000 +0900
+++ pgdat3/mm/page_alloc.c 2006-02-17 18:41:52.000000000 +0900
@@ -37,6 +37,7 @@
#include <linux/nodemask.h>
#include <linux/vmalloc.h>
#include <linux/mempolicy.h>
+#include <linux/stop_machine.h>
#include <asm/tlbflush.h>
#include "internal.h"
@@ -2077,18 +2078,35 @@ void __init setup_per_cpu_pageset(void)
static __meminit
void zone_wait_table_init(struct zone *zone, unsigned long zone_size_pages)
{
- int i;
+ int i, hotadd = (system_state == SYSTEM_RUNNING);
struct pglist_data *pgdat = zone->zone_pgdat;
/*
* The per-page waitqueue mechanism uses hashed waitqueues
* per zone.
*/
- zone->wait_table_size = wait_table_size(zone_size_pages);
- zone->wait_table_bits = wait_table_bits(zone->wait_table_size);
- zone->wait_table = (wait_queue_head_t *)
- alloc_bootmem_node(pgdat, zone->wait_table_size
- * sizeof(wait_queue_head_t));
+ if (hotadd){
+ unsigned long size = 4096UL; /* Max size */
+ wait_queue_head_t *p;
+
+ while (size){
+ p = kmalloc(size * sizeof(wait_queue_head_t),
+ GFP_ATOMIC);
+ if (p)
+ break;
+ size >>= 1;
+ }
+ zone->wait_table_size = size;
+ zone->wait_table_bits = wait_table_bits(size);
+ zone->wait_table = p;
+
+ } else {
+ zone->wait_table_size = wait_table_size(zone_size_pages);
+ zone->wait_table_bits = wait_table_bits(zone->wait_table_size);
+ zone->wait_table = (wait_queue_head_t *)
+ alloc_bootmem_node(pgdat, zone->wait_table_size
+ * sizeof(wait_queue_head_t));
+ }
for(i = 0; i < zone->wait_table_size; ++i)
init_waitqueue_head(zone->wait_table + i);
@@ -2126,6 +2144,7 @@ static __meminit void init_currently_emp
memmap_init(size, pgdat->node_id, zone_idx(zone), zone_start_pfn);
zone_init_free_lists(pgdat, zone, zone->spanned_pages);
+ zone->spanned_pages = size;
}
/*
@@ -2824,3 +2843,53 @@ void *__init alloc_large_system_hash(con
return table;
}
+
+static inline int zone_previously_initialized(struct zone *zone)
+{
+ if (zone->wait_table_size)
+ return 1;
+
+ return 0;
+}
+
+#ifdef CONFIG_MEMORY_HOTPLUG
+static int __build_all_zonelists(void *dummy)
+{
+ int i;
+ for_each_online_node(i)
+ build_zonelists(NODE_DATA(i));
+ /* XXX: Cpuset must be updated when node is hotplugged. */
+ return 0;
+}
+
+DEFINE_SPINLOCK(zone_init_lock);
+int hot_add_zone_init(struct zone *zone, unsigned long phys_start_pfn,
+ unsigned long size_pages)
+{
+ int ret = 0;
+ unsigned long flags;
+ spin_lock_irqsave(&zone_init_lock,flags);
+ if (zone_previously_initialized(zone)) {
+ spin_unlock_irqrestore(&zone_init_lock, flags);
+ return -EEXIST;
+ }
+
+ printk(KERN_DEBUG "hot add zone init %lx %lx.....\n",
+ phys_start_pfn, size_pages);
+ init_currently_empty_zone(zone, phys_start_pfn, size_pages);
+ zone_pcp_init(zone);
+
+ spin_unlock_irqrestore(&zone_init_lock, flags);
+ /*
+ * This is an awfully blunt way to do this. But, the
+ * zonelists are accessed many times over large areas
+ * of performance-critical code in the allocator.
+ * That makes it very hard to get a conventional lock
+ * to work. This of this as a rw lock with a huge
+ * write cost.
+ */
+ stop_machine_run(__build_all_zonelists, zone->zone_pgdat, NR_CPUS);
+
+ return ret;
+}
+#endif
Index: pgdat3/include/linux/mmzone.h
===================================================================
--- pgdat3.orig/include/linux/mmzone.h 2006-02-17 16:52:43.000000000 +0900
+++ pgdat3/include/linux/mmzone.h 2006-02-17 18:41:52.000000000 +0900
@@ -403,7 +403,9 @@ static inline struct zone *next_zone(str
static inline int populated_zone(struct zone *zone)
{
- return (!!zone->present_pages);
+ /* When hot-add, present page is 0 at this point.
+ So check spanned_pages instead of present_pages */
+ return (!!zone->spanned_pages);
}
static inline int is_highmem_idx(int idx)
Index: pgdat3/mm/memory_hotplug.c
===================================================================
--- pgdat3.orig/mm/memory_hotplug.c 2006-02-17 16:52:49.000000000 +0900
+++ pgdat3/mm/memory_hotplug.c 2006-02-17 18:41:52.000000000 +0900
@@ -48,6 +48,8 @@ static int __add_section(struct zone *zo
ret = sparse_add_one_section(zone, phys_start_pfn, nr_pages);
+ hot_add_zone_init(zone, phys_start_pfn, PAGES_PER_SECTION);
+
if (ret < 0)
return ret;
Index: pgdat3/include/linux/memory_hotplug.h
===================================================================
--- pgdat3.orig/include/linux/memory_hotplug.h 2006-02-17 16:52:49.000000000 +0900
+++ pgdat3/include/linux/memory_hotplug.h 2006-02-17 18:52:37.000000000 +0900
@@ -89,6 +89,7 @@ static inline void clear_node_data_array
extern int new_pgdat_init(int, unsigned long, unsigned long);
extern void release_pgdat(pg_data_t *);
+extern int hot_add_zone_init(struct zone *, unsigned long, unsigned long);
#else /* ! CONFIG_MEMORY_HOTPLUG */
/*
--
Yasunori Goto
-
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