tree 373988bec20c7edfe9bc8ded884e18e69c3fadd2
parent e73e04ae354e5b7e735544a1e939fd7831c16bda
author Junyu Lai <junyulai@google.com> 1730280500 +0800
committer Junyu Lai <junyulai@google.com> 1733472788 +0000

Introduce client-side rate limiting for TrafficStats APIs

This change introduces client-side rate limiting for TrafficStats
APIs to address a performance issue caused by excessive calls,
resulting in high CPU usage and binder contention. By caching
traffic statistics on the client side, we reduce the frequency
of calls to NetworkStatsService, improving overall system
performance and mitigating potential privacy concerns related
to traffic analysis fingerprints.

This client-side caching mechanism will be disabled and gradually
enabled through a feature flag rollout.

Test: atest CtsNetTestCases:android.net.cts.TrafficStatsTest \
      CtsNetTestCases:android.net.cts.NetworkStatsBinderTest \
      FrameworksNetIntegrationTests:com.android.server.net.integrationtests.NetworkStatsIntegrationTest \
      ConnectivityCoverageTests:android.net.connectivity.com.android.server.net.NetworkStatsServiceTest \
      ConnectivityCoverageTests:android.net.connectivity.android.net.TrafficStatsTest \
      CtsNetTestCases:android.net.cts.IpSecManagerTest#testIkeOverUdpEncapSocket \
      CtsNetTestCasesUpdateStatsPermission:android.net.cts.networkpermission.updatestatspermission.UpdateStatsPermissionTest#testUpdateDeviceStatsPermission
Test: adb shell device_config put tethering trafficstats_client_rate_limit_cache_enabled_flag [-1|1]
Bug: 343260158
Change-Id: If8a252d8d01c1545b23fdc7a00010f249ca09dc2