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[PATCH] memory hotplug prep: break out zone initialization 

If a zone is empty at boot-time and then hot-added to later, it needs to run
the same init code that would have been run on it at boot.

This patch breaks out zone table and per-cpu-pages functions for use by the
hotplug code.  You can almost see all of the free_area_init_core() function on
one page now.  :)

Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Dave Hansen 2005-10-29 18:16:50 -07:00 committed by Linus Torvalds
parent 2774812f41
commit ed8ece2ec8
1 changed files with 58 additions and 40 deletions
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98
mm/page_alloc.c
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@ -1875,6 +1875,60 @@ void __init setup_per_cpu_pageset()
#endif
static __devinit
void zone_wait_table_init(struct zone *zone, unsigned long zone_size_pages)
{
int i;
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));
for(i = 0; i < zone->wait_table_size; ++i)
init_waitqueue_head(zone->wait_table + i);
}
static __devinit void zone_pcp_init(struct zone *zone)
{
int cpu;
unsigned long batch = zone_batchsize(zone);
for (cpu = 0; cpu < NR_CPUS; cpu++) {
#ifdef CONFIG_NUMA
/* Early boot. Slab allocator not functional yet */
zone->pageset[cpu] = &boot_pageset[cpu];
setup_pageset(&boot_pageset[cpu],0);
#else
setup_pageset(zone_pcp(zone,cpu), batch);
#endif
}
printk(KERN_DEBUG " %s zone: %lu pages, LIFO batch:%lu\n",
zone->name, zone->present_pages, batch);
}
static __devinit void init_currently_empty_zone(struct zone *zone,
unsigned long zone_start_pfn, unsigned long size)
{
struct pglist_data *pgdat = zone->zone_pgdat;
zone_wait_table_init(zone, size);
pgdat->nr_zones = zone_idx(zone) + 1;
zone->zone_mem_map = pfn_to_page(zone_start_pfn);
zone->zone_start_pfn = zone_start_pfn;
memmap_init(size, pgdat->node_id, zone_idx(zone), zone_start_pfn);
zone_init_free_lists(pgdat, zone, zone->spanned_pages);
}
/*
* Set up the zone data structures:
* - mark all pages reserved
@ -1884,8 +1938,8 @@ void __init setup_per_cpu_pageset()
static void __init free_area_init_core(struct pglist_data *pgdat,
unsigned long *zones_size, unsigned long *zholes_size)
{
unsigned long i, j;
int cpu, nid = pgdat->node_id;
unsigned long j;
int nid = pgdat->node_id;
unsigned long zone_start_pfn = pgdat->node_start_pfn;
pgdat->nr_zones = 0;
@ -1895,7 +1949,6 @@ static void __init free_area_init_core(struct pglist_data *pgdat,
for (j = 0; j < MAX_NR_ZONES; j++) {
struct zone *zone = pgdat->node_zones + j;
unsigned long size, realsize;
unsigned long batch;
realsize = size = zones_size[j];
if (zholes_size)
@ -1915,19 +1968,7 @@ static void __init free_area_init_core(struct pglist_data *pgdat,
zone->temp_priority = zone->prev_priority = DEF_PRIORITY;
batch = zone_batchsize(zone);
for (cpu = 0; cpu < NR_CPUS; cpu++) {
#ifdef CONFIG_NUMA
/* Early boot. Slab allocator not functional yet */
zone->pageset[cpu] = &boot_pageset[cpu];
setup_pageset(&boot_pageset[cpu],0);
#else
setup_pageset(zone_pcp(zone,cpu), batch);
#endif
}
printk(KERN_DEBUG " %s zone: %lu pages, LIFO batch:%lu\n",
zone_names[j], realsize, batch);
zone_pcp_init(zone);
INIT_LIST_HEAD(&zone->active_list);
INIT_LIST_HEAD(&zone->inactive_list);
zone->nr_scan_active = 0;
@ -1938,32 +1979,9 @@ static void __init free_area_init_core(struct pglist_data *pgdat,
if (!size)
continue;
/*
* The per-page waitqueue mechanism uses hashed waitqueues
* per zone.
*/
zone->wait_table_size = wait_table_size(size);
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);
pgdat->nr_zones = j+1;
zone->zone_mem_map = pfn_to_page(zone_start_pfn);
zone->zone_start_pfn = zone_start_pfn;
memmap_init(size, nid, j, zone_start_pfn);
zonetable_add(zone, nid, j, zone_start_pfn, size);
init_currently_empty_zone(zone, zone_start_pfn, size);
zone_start_pfn += size;
zone_init_free_lists(pgdat, zone, zone->spanned_pages);
}
}