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[PATCH] Reduce size of huge boot per_cpu_pageset 

Reduce size of the huge per_cpu_pageset structure in __initdata introduced
into mm1 with the pageset localization patchset.  Use one specially
configured pageset per cpu for all zones and nodes during bootup.

- Avoid duplication of pageset initialization code.
- do the adding to the pageset list before potential free_pages_bulk
  in free_hot_cold_page (otherwise we would have to hold a page
  in a pageset during the period that the boot pagesets are in use).
- remove mistaken __cpuinitdata attribute and revert back to __initdata
  for the boot pageset. A boot pageset is not necessary for cpu hotplug.

Tested for UP SMP NUMA on x86_64 (2.6.12-rc6-mm1): UP SMP NUMA Tested on
IA64 (2.6.12-rc5-mm2): NUMA (2.6.12-rc6-mm1 broken for IA64 because of
sparsemem patches)

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Christoph Lameter 2005-06-21 17:15:00 -07:00 committed by Linus Torvalds
parent 4ae7c03943
commit 2caaad41e4
1 changed files with 42 additions and 66 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

108
mm/page_alloc.c
View File

@ -71,11 +71,6 @@ EXPORT_SYMBOL(nr_swap_pages);
struct zone *zone_table[1 << (ZONES_SHIFT + NODES_SHIFT)];
EXPORT_SYMBOL(zone_table);
#ifdef CONFIG_NUMA
static struct per_cpu_pageset
pageset_table[MAX_NR_ZONES*MAX_NUMNODES*NR_CPUS] __initdata;
#endif
static char *zone_names[MAX_NR_ZONES] = { "DMA", "Normal", "HighMem" };
int min_free_kbytes = 1024;
@ -652,10 +647,10 @@ static void fastcall free_hot_cold_page(struct page *page, int cold)
free_pages_check(__FUNCTION__, page);
pcp = &zone_pcp(zone, get_cpu())->pcp[cold];
local_irq_save(flags);
if (pcp->count >= pcp->high)
pcp->count -= free_pages_bulk(zone, pcp->batch, &pcp->list, 0);
list_add(&page->lru, &pcp->list);
pcp->count++;
if (pcp->count >= pcp->high)
pcp->count -= free_pages_bulk(zone, pcp->batch, &pcp->list, 0);
local_irq_restore(flags);
put_cpu();
}
@ -1714,57 +1709,55 @@ static int __devinit zone_batchsize(struct zone *zone)
return batch;
}
inline void setup_pageset(struct per_cpu_pageset *p, unsigned long batch)
{
struct per_cpu_pages *pcp;
pcp = &p->pcp[0]; /* hot */
pcp->count = 0;
pcp->low = 2 * batch;
pcp->high = 6 * batch;
pcp->batch = max(1UL, 1 * batch);
INIT_LIST_HEAD(&pcp->list);
pcp = &p->pcp[1]; /* cold*/
pcp->count = 0;
pcp->low = 0;
pcp->high = 2 * batch;
pcp->batch = max(1UL, 1 * batch);
INIT_LIST_HEAD(&pcp->list);
}
#ifdef CONFIG_NUMA
/*
* Dynamicaly allocate memory for the
* Boot pageset table. One per cpu which is going to be used for all
* zones and all nodes. The parameters will be set in such a way
* that an item put on a list will immediately be handed over to
* the buddy list. This is safe since pageset manipulation is done
* with interrupts disabled.
*
* Some NUMA counter updates may also be caught by the boot pagesets.
* These will be discarded when bootup is complete.
*/
static struct per_cpu_pageset
boot_pageset[NR_CPUS] __initdata;
/*
* Dynamically allocate memory for the
* per cpu pageset array in struct zone.
*/
static int __devinit process_zones(int cpu)
{
struct zone *zone, *dzone;
int i;
for_each_zone(zone) {
struct per_cpu_pageset *npageset = NULL;
npageset = kmalloc_node(sizeof(struct per_cpu_pageset),
zone->pageset[cpu] = kmalloc_node(sizeof(struct per_cpu_pageset),
GFP_KERNEL, cpu_to_node(cpu));
if (!npageset) {
zone->pageset[cpu] = NULL;
if (!zone->pageset[cpu])
goto bad;
}
if (zone->pageset[cpu]) {
memcpy(npageset, zone->pageset[cpu],
sizeof(struct per_cpu_pageset));
/* Relocate lists */
for (i = 0; i < 2; i++) {
INIT_LIST_HEAD(&npageset->pcp[i].list);
list_splice(&zone->pageset[cpu]->pcp[i].list,
&npageset->pcp[i].list);
}
} else {
struct per_cpu_pages *pcp;
unsigned long batch;
batch = zone_batchsize(zone);
pcp = &npageset->pcp[0]; /* hot */
pcp->count = 0;
pcp->low = 2 * batch;
pcp->high = 6 * batch;
pcp->batch = 1 * batch;
INIT_LIST_HEAD(&pcp->list);
pcp = &npageset->pcp[1]; /* cold*/
pcp->count = 0;
pcp->low = 0;
pcp->high = 2 * batch;
pcp->batch = 1 * batch;
INIT_LIST_HEAD(&pcp->list);
}
zone->pageset[cpu] = npageset;
setup_pageset(zone->pageset[cpu], zone_batchsize(zone));
}
return 0;
@ -1878,30 +1871,13 @@ static void __init free_area_init_core(struct pglist_data *pgdat,
batch = zone_batchsize(zone);
for (cpu = 0; cpu < NR_CPUS; cpu++) {
struct per_cpu_pages *pcp;
#ifdef CONFIG_NUMA
struct per_cpu_pageset *pgset;
pgset = &pageset_table[nid*MAX_NR_ZONES*NR_CPUS +
(j * NR_CPUS) + cpu];
zone->pageset[cpu] = pgset;
/* Early boot. Slab allocator not functional yet */
zone->pageset[cpu] = &boot_pageset[cpu];
setup_pageset(&boot_pageset[cpu],0);
#else
struct per_cpu_pageset *pgset = zone_pcp(zone, cpu);
setup_pageset(zone_pcp(zone,cpu), batch);
#endif
pcp = &pgset->pcp[0]; /* hot */
pcp->count = 0;
pcp->low = 2 * batch;
pcp->high = 6 * batch;
pcp->batch = 1 * batch;
INIT_LIST_HEAD(&pcp->list);
pcp = &pgset->pcp[1]; /* cold */
pcp->count = 0;
pcp->low = 0;
pcp->high = 2 * batch;
pcp->batch = 1 * batch;
INIT_LIST_HEAD(&pcp->list);
}
printk(KERN_DEBUG " %s zone: %lu pages, LIFO batch:%lu\n",
zone_names[j], realsize, batch);