commit 5f05fbcb0edee2c63b8804a7da103473f25bd314
author Mark Salyzyn <salyzyn@google.com> Mon Oct 12 13:45:51 2015 -0700
committer Mark Salyzyn <salyzyn@google.com> Tue Nov 03 15:34:15 2015 -0800
tree c7ae8f66d22180e90b911a8aa3824ac10dbe9650
parent cb7241363bf6aed07eec287facd22c957bcbc140

logd: pruning time horizon

Estimate a time horizon of ten fold for worst UID pruning

Bug: 24782000
Change-Id: I7118deb6d42531c68ed2ac2a59c57b0580b942cc

logd/LogBuffer.cpp

diff --git a/logd/LogBuffer.cpp b/logd/LogBuffer.cpp
index 1de8e64..4ada788 100644
--- a/logd/LogBuffer.cpp
+++ b/logd/LogBuffer.cpp
@@ -436,7 +436,10 @@
                     worst_sizes = sorted[0]->getSizes();
                     // Calculate threshold as 12.5% of available storage
                     size_t threshold = log_buffer_size(id) / 8;
-                    if (worst_sizes > threshold) {
+                    if ((worst_sizes > threshold)
+                        // Allow time horizon to extend roughly tenfold, assume
+                        // average entry length is 100 characters.
+                            && (worst_sizes > (10 * sorted[0]->getDropped()))) {
                         worst = sorted[0]->getKey();
                         second_worst_sizes = sorted[1]->getSizes();
                         if (second_worst_sizes < threshold) {