commit 2838157287cae0ac04ace6880c12d7c576c71f9c
author Mark Salyzyn <salyzyn@google.com> Mon Aug 24 13:43:27 2015 -0700
committer Mark Salyzyn <salyzyn@google.com> Mon Aug 24 14:04:45 2015 -0700
tree dd30db6f5e077a8bd086b1ff5532297882a5b7bc
parent 3474f5ebbeff1e890e7bcef7936676fd02821d13

logd: worst uid record watermark part deux

Only record watermark if not known, or represents the worst UID
currently under focus. This has resulted in a halving of the average
prune time in the face of heavy spam because we get less processing
spikes.

Bug: 23327476
Change-Id: I19f297042b9fc2c98d902695c1c36df1bf5cd6f6

logd/LogBuffer.cpp

diff --git a/logd/LogBuffer.cpp b/logd/LogBuffer.cpp
index 6ea4109..c609870 100644
--- a/logd/LogBuffer.cpp
+++ b/logd/LogBuffer.cpp
@@ -467,7 +467,11 @@
             // unmerged drop message
             if (dropped) {
                 last.add(e);
-                mLastWorstUid[id][e->getUid()] = it;
+                if ((e->getUid() == worst)
+                        || (mLastWorstUid[id].find(e->getUid())
+                            == mLastWorstUid[id].end())) {
+                    mLastWorstUid[id][e->getUid()] = it;
+                }
                 ++it;
                 continue;
             }