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memory hotplug: update zone pcp at memory online

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In my test, 128M memory is hot added, but zone's pcp batch is 0, which is
an obvious error.  When pages are onlined, zone pcp should be updated
accordingly.

[akpm@linux-foundation.org: fix warnings]
Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Yakui Zhao <yakui.zhao@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Shaohua Li 2009-09-21 17:01:16 -07:00 committed by Linus Torvalds
parent 478b81fd84
commit 112067f090
3 changed files with 29 additions and 0 deletions
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2
include/linux/mm.h
View file

@ -1058,6 +1058,8 @@ extern void setup_per_cpu_pageset(void);
static inline void setup_per_cpu_pageset(void) {}
#endif
extern void zone_pcp_update(struct zone *zone);
/* nommu.c */
extern atomic_long_t mmap_pages_allocated;

1
mm/memory_hotplug.c
View file

@ -422,6 +422,7 @@ int online_pages(unsigned long pfn, unsigned long nr_pages)
zone->present_pages += onlined_pages;
zone->zone_pgdat->node_present_pages += onlined_pages;
zone_pcp_update(zone);
setup_per_zone_wmarks();
calculate_zone_inactive_ratio(zone);
if (onlined_pages) {

26
mm/page_alloc.c
View file

@ -3142,6 +3142,32 @@ int zone_wait_table_init(struct zone *zone, unsigned long zone_size_pages)
return 0;
}
static int __zone_pcp_update(void *data)
{
struct zone *zone = data;
int cpu;
unsigned long batch = zone_batchsize(zone), flags;
for (cpu = 0; cpu < NR_CPUS; cpu++) {
struct per_cpu_pageset *pset;
struct per_cpu_pages *pcp;
pset = zone_pcp(zone, cpu);
pcp = &pset->pcp;
local_irq_save(flags);
free_pages_bulk(zone, pcp->count, &pcp->list, 0);
setup_pageset(pset, batch);
local_irq_restore(flags);
}
return 0;
}
void zone_pcp_update(struct zone *zone)
{
stop_machine(__zone_pcp_update, zone, NULL);
}
static __meminit void zone_pcp_init(struct zone *zone)
{
int cpu;