commit f54465a2ba2a2ec61846cb8e2c2932ea371e8423
author Rafal Slawik <rslawik@google.com> Tue Apr 16 13:16:15 2019 +0100
committer Rafal Slawik <rslawik@google.com> Fri Apr 19 06:13:27 2019 +0000
tree a0748a242171382a05bd800ae2b7f452ef88d9b4
parent 40db3fa518daa6156b9e4147391afcebc04255bf

Monitor swap

Pull value of VmSwap from /proc/PID/status when capturing
ProcessMemoryState atom.

Before change:
(average pull time nanos) 43355896
(max pull time nanos) 75649278

After change:
(average pull time nanos) 86307073
(max pull time nanos) 151681474

Delta: 2x increase
Pulling frequency is controled via statsd and we trade-off more
expensive reads for more actionable data (helping detect memory leaks).

Bug: 130624561
Test: atest MemoryStatUtilTest
Test: benchmark pulling ProcessMemoryState atom
Test: manually take a statsd report
Change-Id: I1d90563b70b5253b3d31ddab4810db870620c4d4
(cherry picked from commit c8debedbc0bc542b8f79efc1390712de19cd985c)