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memory-hotplug: fix zone stat mismatch

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During memory-hotplug, I found NR_ISOLATED_[ANON|FILE] are increasing,
causing the kernel to hang.  When the system doesn't have enough free
pages, it enters reclaim but never reclaim any pages due to
too_many_isolated()==true and loops forever.

The cause is that when we do memory-hotadd after memory-remove,
__zone_pcp_update() clears a zone's ZONE_STAT_ITEMS in setup_pageset()
although the vm_stat_diff of all CPUs still have values.

In addtion, when we offline all pages of the zone, we reset them in
zone_pcp_reset without draining so we loss some zone stat item.

Reviewed-by: Wen Congyang <[email protected]>
Signed-off-by: Minchan Kim <[email protected]>
Cc: Kamezawa Hiroyuki <[email protected]>
Cc: Yasuaki Ishimatsu <[email protected]>
Cc: KOSAKI Motohiro <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Minchan Kim 2012-10-08 16:33:39 -07:00 • committed by Linus Torvalds
commit 5a88381384
3 changed files with 23 additions and 0 deletions
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12
mm/vmstat.c
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@ -495,6 +495,18 @@ void refresh_cpu_vm_stats(int cpu)
atomic_long_add(global_diff[i], &vm_stat[i]);
}
void drain_zonestat(struct zone *zone, struct per_cpu_pageset *pset)
{
int i;
for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
if (pset->vm_stat_diff[i]) {
int v = pset->vm_stat_diff[i];
pset->vm_stat_diff[i] = 0;
atomic_long_add(v, &zone->vm_stat[i]);
atomic_long_add(v, &vm_stat[i]);
}
}
#endif
#ifdef CONFIG_NUMA