mm: synchronize period update interval
Wei pointed out period update is racy so it could make partial
update, which could lose a ton of trace potentially.
To close period_ms race between updating and reading, use rwlock
to reduce contention.
To close vmstat_period_ms between updating and reading,
use vmstat_lock.
This patch has small refactoring, too.
Bug: 80168800
Change-Id: I7f84cff758b533b7881f47889c7662b743bc3c12
Signed-off-by: Minchan Kim <minchan@google.com>
(cherry picked from commit 42bbc3be3f2b7663385c141e1fcf4d3b9e70ebe7)
1 file changed
