tree 7d72d5bf4ab25782e049ff4625ff73dc30929f56
parent abb0b0275a5f8095b38f8b41ee3a5f3c7f19030a
author Max Dashouk <mdashouk@google.com> 1558051087 -0700
committer Yao Chen <yaochen@google.com> 1558644838 +0000

Fixes the bug that can occur when StatsCompanionService calls
StatsService to update UID data and overflows kernel transfer buffer.

In this case, the IPC call silently fails. The issue was discovered in Android Automotive Embedded use case that employs multiuser setup. This causes more uid data being sent via one-way StatsCompanionService::informAllUidData call than usual and can trigger the issue. As the result, uid map on statsd side is empty and many metrics are not captured.

Bug: b/132444397
Fixes: b/132444397
Test: Did a clean build of master branch and flashed the device. adb
shell cmd stats print-uid-map returned without any result. Repeated the
steps after implementing the fix, print-uid-map returns the results now.

Change-Id: I1451c13b36696449c145c51618c68d10e29a596a