tree 76dbd00f85dc73a9b2d5d8a57169ae698e7b641f
parent 8be3181903c25b5b7ddaa7092f7b8c8f0acbe10b
author Minchan Kim <minchan@google.com> 1547528047 +0900
committer Minchan Kim <minchan@google.com> 1548802214 +0900

mm: mm_event supports vmstat

Vmstat is significantly important to investigate MM problem.
We have solved many problmes with it via asking users to get
vmstat data periodically from the device, which manual way is
painful once we release the device or on hard reproducible
scenario.

This patch adds periodic vmstat dump into mm_event. It works
only if there are some events in compaction or reclaim. Thus,
unless there is memory pressure, it doesn't gather any vmstat
data. Default interval between each dump is 1000ms.
Admin can tweak it via

	echo 2000 > /sys/kernel/debug/mm_event/vmstat_period_ms

Bug: 80168800
Change-Id: I4c0e7237d7764c4ea79da00952e5de34ccbe4187
Signed-off-by: Minchan Kim <minchan@google.com>
minchan: fixed zone lru accounting
(cherry picked from commit 2637ebbe4fcfb8fcff64bb83f7b3917b8bc566e4)