Update the comment about tag limit
describe more details about the total uid stats entries limit in the
definition to make it better to understand.
Bug: 126620214
Test: Build
Change-Id: Ic2cdbc7cff7b8fa41316d9193c3eaf70536296c9
diff --git a/server/TrafficController.cpp b/server/TrafficController.cpp
index 9d9a3b5..fe6d49e 100644
--- a/server/TrafficController.cpp
+++ b/server/TrafficController.cpp
@@ -73,7 +73,10 @@
constexpr int kSockDiagMsgType = SOCK_DIAG_BY_FAMILY;
constexpr int kSockDiagDoneMsgType = NLMSG_DONE;
constexpr int PER_UID_STATS_ENTRIES_LIMIT = 500;
-// Total stats entry limit is 90% of the stats map total size.
+// At most 90% of the stats map may be used by tagged traffic entries. This ensures
+// that 10% of the map is always available to count untagged traffic, one entry per UID.
+// Otherwise, apps would be able to avoid data usage accounting entirely by filling up the
+// map with tagged traffic entries.
constexpr int TOTAL_UID_STATS_ENTRIES_LIMIT = STATS_MAP_SIZE * 0.9;
static_assert(BPF_PERMISSION_INTERNET == INetd::PERMISSION_INTERNET,