vmstat: use this_cpu() to avoid irqon/off sequence in refresh_cpu_vm_stats
vmstat: use this_cpu() to avoid irqon/off sequence in refresh_cpu_vm_stats

Disabling interrupts repeatedly can be avoided in the inner loop if we use
a this_cpu operation.

Signed-off-by: Christoph Lameter <ef3ecccf258fa062c5c6521a4887d40541963af7@linux.com>
Cc: KOSAKI Motohiro <70a1d3ef3e17a2bb0f09a1b2e6c86f607ed1d6d9@jp.fujitsu.com>
CC: Tejun Heo <546b05909706652891a87f7bfe385ae147f61f91@kernel.org>
Cc: Joonsoo Kim <d91a346a9a76eb1627d34d097d6cb4c8e5067100@gmail.com>
Cc: Alexey Dobriyan <b99bff5923d24d2fb8e844db9dac7cd59203da1d@gmail.com>
Signed-off-by: Andrew Morton <5c1e68b099950c134891f0b6e179498a8ebe9cf9@linux-foundation.org>
Signed-off-by: Linus Torvalds <69652caca27c8b940640ad396ab71f93cacec34f@linux-foundation.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs