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mm: set N_CPU to node_states during boot

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After a system booted, N_CPU is not set to any node as has_cpu shows an
empty line.

  # cat /sys/devices/system/node/has_cpu
  (show-empty-line)

setup_vmstat() registers its CPU notifier callback,
vmstat_cpuup_callback(), which marks N_CPU to a node when a CPU is put
into online.  However, setup_vmstat() is called after all CPUs are
launched in the boot sequence.

Changed setup_vmstat() to mark N_CPU to the nodes with online CPUs at
boot, which is consistent with other operations in
vmstat_cpuup_callback(), i.e.  start_cpu_timer() and
refresh_zone_stat_thresholds().

Also added get_online_cpus() to protect the for_each_online_cpu() loop.

Signed-off-by: Toshi Kani <[email protected]>
Acked-by: Christoph Lameter <[email protected]>
Reviewed-by: Yasuaki Ishimatsu <[email protected]>
Tested-by: Yasuaki Ishimatsu <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Toshi Kani 2013-11-12 15:08:12 -08:00 • committed by Linus Torvalds
commit d7e0b37a87
1 changed files with 5 additions and 1 deletions
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6
mm/vmstat.c
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@ -1276,8 +1276,12 @@ static int __init setup_vmstat(void)
register_cpu_notifier(&vmstat_notifier);
for_each_online_cpu(cpu)
get_online_cpus();
for_each_online_cpu(cpu) {
start_cpu_timer(cpu);
node_set_state(cpu_to_node(cpu), N_CPU);
}
put_online_cpus();
#endif
#ifdef CONFIG_PROC_FS
proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations);