commit ddda212faa81d62f637926680cd8163345120f71
author Mark Salyzyn <salyzyn@google.com> Fri Oct 02 09:22:52 2015 -0700
committer Mark Salyzyn <salyzyn@google.com> Fri Oct 02 16:45:22 2015 -0700
tree 73f729e24adb87f184691d0014cf377b398a6a64
parent 5ac5c6b19364b5b3061a59db796b2357c95c3b64

logd: optimize code hotspots

Discovered that we had a few libc hotspots. Adjust code to generally
reduce or nullify the number of calls to malloc, free, strlen,
strcmp, strncmp, memcmp & strncasecmp. Total gain looks to be about
3% of logd's processing time. malloc still contributes to 3%, but all
others are now total 0.5%.

Bug: 23685592
Change-Id: Ife721121667969260cdb8b055524ae90f5911278

logd/LogReader.cpp

diff --git a/logd/LogReader.cpp b/logd/LogReader.cpp
index c7deec0..3833843 100644
--- a/logd/LogReader.cpp
+++ b/logd/LogReader.cpp
@@ -95,7 +95,7 @@
     }
 
     bool nonBlock = false;
-    if (strncmp(buffer, "dumpAndClose", 12) == 0) {
+    if (!fast<strncmp>(buffer, "dumpAndClose", 12)) {
         // Allow writer to get some cycles, and wait for pending notifications
         sched_yield();
         LogTimeEntry::lock();