tree d2bb6bb2f5e58a6a63e4dd67a6e287e1de6c769f
parent 669a6884f1836377f40cf89caa4fdf2f371ee5c2
author junyulai <junyulai@google.com> 1541751149 +0800
committer junyulai <junyulai@google.com> 1542073396 +0800

Sort and group network stats collected from eBPF.

Since eBPF use hash map to record stats, network stats collected
from eBPF will be out of order. And the performance of
findIndexHinted in NetworkStats would be impacted.

Furthermore, since the StatsKey contains iface index, the
network stats reported to framework would create items with the
same iface, uid, tag and set, which causes NetworkStats maps
wrong item to subtract.

Thus, the stats needs to be properly sorted and grouped before
reported.

Bug: 112226716
Bug: 119193941
Test: 1. manually reconnect vpn
      2. update apps from playstore
      3. atest libnetdbpf_test
      4. runtest frameworks-net
      5. cts-tradefed run cts -m CtsUsageStatsTestCases -t \
              android.app.usage.cts.NetworkUsageStatsTest

Change-Id: I6d485a368fd8e52d21d5e894fc189ac8f0e9f502