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| author | Toshi Kani <toshi.kani@hp.com> | 2013-11-12 15:08:13 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-11-13 12:09:09 +0900 |
| commit | 807a1bd2b2a38845fd422b93328e7d69f13eb13a (patch) | |
| tree | 355479f5a20d1ed71261bd9071583651e5983f4e /mm/vmstat.c | |
| parent | d7e0b37a87c39f5c02dd7b5d55c7a3ec2f65b943 (diff) | |
| download | linux-807a1bd2b2a38845fd422b93328e7d69f13eb13a.tar.gz linux-807a1bd2b2a38845fd422b93328e7d69f13eb13a.tar.bz2 linux-807a1bd2b2a38845fd422b93328e7d69f13eb13a.zip | |
mm: clear N_CPU from node_states at CPU offline
vmstat_cpuup_callback() is a CPU notifier callback, which marks N_CPU to a
node at CPU online event. However, it does not update this N_CPU info at
CPU offline event.
Changed vmstat_cpuup_callback() to clear N_CPU when the last CPU in the
node is put into offline, i.e. the node no longer has any online CPU.
Signed-off-by: Toshi Kani <toshi.kani@hp.com>
Acked-by: Christoph Lameter <cl@linux.com>
Reviewed-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Tested-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/vmstat.c')
| -rw-r--r-- | mm/vmstat.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/mm/vmstat.c b/mm/vmstat.c index 0a1f7de972b3..b6d17edf8cf3 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -1229,6 +1229,20 @@ static void start_cpu_timer(int cpu) schedule_delayed_work_on(cpu, work, __round_jiffies_relative(HZ, cpu)); } +static void vmstat_cpu_dead(int node) +{ + int cpu; + + get_online_cpus(); + for_each_online_cpu(cpu) + if (cpu_to_node(cpu) == node) + goto end; + + node_clear_state(node, N_CPU); +end: + put_online_cpus(); +} + /* * Use the cpu notifier to insure that the thresholds are recalculated * when necessary. @@ -1258,6 +1272,7 @@ static int vmstat_cpuup_callback(struct notifier_block *nfb, case CPU_DEAD: case CPU_DEAD_FROZEN: refresh_zone_stat_thresholds(); + vmstat_cpu_dead(cpu_to_node(cpu)); break; default: break; |