From 1ac79cbd89938649e5bc963d74b417e8a8ed53d7 Mon Sep 17 00:00:00 2001
From: Mark Salyzyn <salyzyn@google.com>
Date: Thu, 23 Apr 2015 15:08:11 -0700
Subject: [PATCH] liblog: Add BM_is_loggable benchmark

- On a N9 64-bit benchmark, the __android_log_is_loggable overhead
  is roughly 500ns (1/2 of a syscall?)

Bug: 19544788
Bug: 17760225
Bug: 20416721
Change-Id: Ib9e4d06d96e1b19ca5d459e569ead451ef47a9c0
---
 liblog/tests/liblog_benchmark.cpp | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/liblog/tests/liblog_benchmark.cpp b/liblog/tests/liblog_benchmark.cpp
index 979adedee..b5946344e 100644
--- a/liblog/tests/liblog_benchmark.cpp
+++ b/liblog/tests/liblog_benchmark.cpp
@@ -266,3 +266,17 @@ static void BM_log_delay(int iters) {
     android_logger_list_free(logger_list);
 }
 BENCHMARK(BM_log_delay);
+
+/*
+ *	Measure the time it takes for __android_log_is_loggable.
+ */
+static void BM_is_loggable(int iters) {
+    StartBenchmarkTiming();
+
+    for (int i = 0; i < iters; ++i) {
+        __android_log_is_loggable(ANDROID_LOG_WARN, "logd", ANDROID_LOG_VERBOSE);
+    }
+
+    StopBenchmarkTiming();
+}
+BENCHMARK(BM_is_loggable);