Hi Bob,
Yes, we need to handle the wait table too. We has tried to remove the
pgdat and wait table altogether, but found it's really hard to remove pgdat
for empty nodes. I think the candidate solution is to free wait table but
keep pgdat. Any suggestions?
Thanks!
Gerry
On 2012-7-19 15:58, Bob Liu wrote:
> On Thu, Jul 5, 2012 at 5:45 PM, Jiang Liu <jiang.liu@xxxxxxxxxx> wrote:
>> When a zone becomes empty after memory offlining, free zone->pageset.
>> Otherwise it will cause memory leak when adding memory to the empty
>> zone again because build_all_zonelists() will allocate zone->pageset
>> for an empty zone.
>>
>
> What about other area allocated to the zone? eg. wait_table?
>
>> Signed-off-by: Jiang Liu <liuj97@xxxxxxxxx>
>> Signed-off-by: Wei Wang <Bessel.Wang@xxxxxxxxxx>
>> ---
>> include/linux/mm.h | 1 +
>> mm/memory_hotplug.c | 3 +++
>> mm/page_alloc.c | 13 +++++++++++++
>> 3 files changed, 17 insertions(+), 0 deletions(-)
>>
>> diff --git a/include/linux/mm.h b/include/linux/mm.h
>> index b36d08c..f8b62f2 100644
>> --- a/include/linux/mm.h
>> +++ b/include/linux/mm.h
>> @@ -1331,6 +1331,7 @@ void warn_alloc_failed(gfp_t gfp_mask, int order, const char *fmt, ...);
>> extern void setup_per_cpu_pageset(void);
>>
>> extern void zone_pcp_update(struct zone *zone);
>> +extern void zone_pcp_reset(struct zone *zone);
>>
>> /* nommu.c */
>> extern atomic_long_t mmap_pages_allocated;
>> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
>> index bce80c7..998b792 100644
>> --- a/mm/memory_hotplug.c
>> +++ b/mm/memory_hotplug.c
>> @@ -966,6 +966,9 @@ repeat:
>>
>> init_per_zone_wmark_min();
>>
>> + if (!populated_zone(zone))
>> + zone_pcp_reset(zone);
>> +
>> if (!node_present_pages(node)) {
>> node_clear_state(node, N_HIGH_MEMORY);
>> kswapd_stop(node);
>> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
>> index ebf319d..5964b7a 100644
>> --- a/mm/page_alloc.c
>> +++ b/mm/page_alloc.c
>> @@ -5872,6 +5872,19 @@ void free_contig_range(unsigned long pfn, unsigned nr_pages)
>> #endif
>>
>> #ifdef CONFIG_MEMORY_HOTREMOVE
>> +void zone_pcp_reset(struct zone *zone)
>> +{
>> + unsigned long flags;
>> +
>> + /* avoid races with drain_pages() */
>> + local_irq_save(flags);
>> + if (zone->pageset != &boot_pageset) {
>> + free_percpu(zone->pageset);
>> + zone->pageset = &boot_pageset;
>> + }
>> + local_irq_restore(flags);
>> +}
>> +
>> /*
>> * All pages in the range must be isolated before calling this.
>> */
>> --
>> 1.7.1
>>
>>
>> --
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>
>
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