Commit 112067f0 authored by Shaohua Li's avatar Shaohua Li Committed by Linus Torvalds
Browse files

memory hotplug: update zone pcp at memory online 



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: default avatarShaohua 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 478b81fd

include/linux/mm.h

+2 −0
Original line number Diff line number Diff line
@@ -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;

mm/memory_hotplug.c

+1 −0
Original line number Diff line number Diff line
@@ -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) {

mm/page_alloc.c

+26 −0
Original line number Diff line number Diff line
@@ -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;

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