liblog: Add liblog test suite
(cherry picked from commit 8d1fdb509305e93eb46d45a6dcd34bedd6dc0742)
Change-Id: Ia457d518b4e7ff37e840336ff0c48583709700d4
diff --git a/liblog/tests/liblog_benchmark.cpp b/liblog/tests/liblog_benchmark.cpp
new file mode 100644
index 0000000..19406fb
--- /dev/null
+++ b/liblog/tests/liblog_benchmark.cpp
@@ -0,0 +1,268 @@
+/*
+ * Copyright (C) 2013-2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <sys/socket.h>
+#include <cutils/sockets.h>
+#include <log/log.h>
+#include <log/logger.h>
+#include <log/log_read.h>
+
+#include "benchmark.h"
+
+// enhanced version of LOG_FAILURE_RETRY to add support for EAGAIN and
+// non-syscall libs. Since we are benchmarking, or using this in the emergency
+// signal to stuff a terminating code, we do NOT want to introduce
+// a syscall or usleep on EAGAIN retry.
+#define LOG_FAILURE_RETRY(exp) ({ \
+ typeof (exp) _rc; \
+ do { \
+ _rc = (exp); \
+ } while (((_rc == -1) \
+ && ((errno == EINTR) \
+ || (errno == EAGAIN))) \
+ || (_rc == -EINTR) \
+ || (_rc == -EAGAIN)); \
+ _rc; })
+
+/*
+ * Measure the fastest rate we can reliabley stuff print messages into
+ * the log at high pressure. Expect this to be less than double the process
+ * wakeup time (2ms?)
+ */
+static void BM_log_maximum_retry(int iters) {
+ StartBenchmarkTiming();
+
+ for (int i = 0; i < iters; ++i) {
+ LOG_FAILURE_RETRY(
+ __android_log_print(ANDROID_LOG_INFO,
+ "BM_log_maximum_retry", "%d", i));
+ }
+
+ StopBenchmarkTiming();
+}
+BENCHMARK(BM_log_maximum_retry);
+
+/*
+ * Measure the fastest rate we can stuff print messages into the log
+ * at high pressure. Expect this to be less than double the process wakeup
+ * time (2ms?)
+ */
+static void BM_log_maximum(int iters) {
+ StartBenchmarkTiming();
+
+ for (int i = 0; i < iters; ++i) {
+ __android_log_print(ANDROID_LOG_INFO, "BM_log_maximum", "%d", i);
+ }
+
+ StopBenchmarkTiming();
+}
+BENCHMARK(BM_log_maximum);
+
+/*
+ * Measure the time it takes to submit the android logging call using
+ * discrete acquisition under light load. Expect this to be a pair of
+ * syscall periods (2us).
+ */
+static void BM_clock_overhead(int iters) {
+ for (int i = 0; i < iters; ++i) {
+ StartBenchmarkTiming();
+ StopBenchmarkTiming();
+ }
+}
+BENCHMARK(BM_clock_overhead);
+
+/*
+ * Measure the time it takes to submit the android logging call using
+ * discrete acquisition under light load. Expect this to be a dozen or so
+ * syscall periods (40us).
+ */
+static void BM_log_overhead(int iters) {
+ for (int i = 0; i < iters; ++i) {
+ StartBenchmarkTiming();
+ __android_log_print(ANDROID_LOG_INFO, "BM_log_overhead", "%d", i);
+ StopBenchmarkTiming();
+ usleep(1000);
+ }
+}
+BENCHMARK(BM_log_overhead);
+
+static void caught_latency(int signum)
+{
+ unsigned long long v = 0xDEADBEEFA55A5AA5ULL;
+
+ LOG_FAILURE_RETRY(__android_log_btwrite(0, EVENT_TYPE_LONG, &v, sizeof(v)));
+}
+
+static unsigned long long caught_convert(char *cp)
+{
+ unsigned long long l = cp[0] & 0xFF;
+ l |= (unsigned long long) (cp[1] & 0xFF) << 8;
+ l |= (unsigned long long) (cp[2] & 0xFF) << 16;
+ l |= (unsigned long long) (cp[3] & 0xFF) << 24;
+ l |= (unsigned long long) (cp[4] & 0xFF) << 32;
+ l |= (unsigned long long) (cp[5] & 0xFF) << 40;
+ l |= (unsigned long long) (cp[6] & 0xFF) << 48;
+ l |= (unsigned long long) (cp[7] & 0xFF) << 56;
+ return l;
+}
+
+static const int alarm_time = 3;
+
+/*
+ * Measure the time it takes for the logd posting call to acquire the
+ * timestamp to place into the internal record. Expect this to be less than
+ * 4 syscalls (3us).
+ */
+static void BM_log_latency(int iters) {
+ pid_t pid = getpid();
+
+ struct logger_list * logger_list = android_logger_list_open(LOG_ID_EVENTS,
+ O_RDONLY, 0, pid);
+
+ if (!logger_list) {
+ fprintf(stderr, "Unable to open events log: %s\n", strerror(errno));
+ exit(EXIT_FAILURE);
+ }
+
+ signal(SIGALRM, caught_latency);
+ alarm(alarm_time);
+
+ for (int j = 0, i = 0; i < iters && j < 10*iters; ++i, ++j) {
+ log_time ts;
+ LOG_FAILURE_RETRY((
+ clock_gettime(CLOCK_REALTIME, &ts),
+ android_btWriteLog(0, EVENT_TYPE_LONG, &ts, sizeof(ts))));
+
+ for (;;) {
+ log_msg log_msg;
+ int ret = android_logger_list_read(logger_list, &log_msg);
+ alarm(alarm_time);
+
+ if (ret <= 0) {
+ iters = i;
+ break;
+ }
+ if ((log_msg.entry.len != (4 + 1 + 8))
+ || (log_msg.id() != LOG_ID_EVENTS)) {
+ continue;
+ }
+
+ char* eventData = log_msg.msg();
+
+ if (eventData[4] != EVENT_TYPE_LONG) {
+ continue;
+ }
+ log_time tx(eventData + 4 + 1);
+ if (ts != tx) {
+ if (0xDEADBEEFA55A5AA5ULL == caught_convert(eventData + 4 + 1)) {
+ iters = i;
+ break;
+ }
+ continue;
+ }
+
+ uint64_t start = ts.nsec();
+ uint64_t end = log_msg.nsec();
+ if (end >= start) {
+ StartBenchmarkTiming(start);
+ StopBenchmarkTiming(end);
+ } else {
+ --i;
+ }
+ break;
+ }
+ }
+
+ signal(SIGALRM, SIG_DFL);
+ alarm(0);
+
+ android_logger_list_free(logger_list);
+}
+BENCHMARK(BM_log_latency);
+
+static void caught_delay(int signum)
+{
+ unsigned long long v = 0xDEADBEEFA55A5AA6ULL;
+
+ LOG_FAILURE_RETRY(__android_log_btwrite(0, EVENT_TYPE_LONG, &v, sizeof(v)));
+}
+
+/*
+ * Measure the time it takes for the logd posting call to make it into
+ * the logs. Expect this to be less than double the process wakeup time (2ms).
+ */
+static void BM_log_delay(int iters) {
+ pid_t pid = getpid();
+
+ struct logger_list * logger_list = android_logger_list_open(LOG_ID_EVENTS,
+ O_RDONLY, 0, pid);
+
+ if (!logger_list) {
+ fprintf(stderr, "Unable to open events log: %s\n", strerror(errno));
+ exit(EXIT_FAILURE);
+ }
+
+ signal(SIGALRM, caught_delay);
+ alarm(alarm_time);
+
+ StartBenchmarkTiming();
+
+ for (int i = 0; i < iters; ++i) {
+ log_time ts(CLOCK_REALTIME);
+
+ LOG_FAILURE_RETRY(
+ android_btWriteLog(0, EVENT_TYPE_LONG, &ts, sizeof(ts)));
+
+ for (;;) {
+ log_msg log_msg;
+ int ret = android_logger_list_read(logger_list, &log_msg);
+ alarm(alarm_time);
+
+ if (ret <= 0) {
+ iters = i;
+ break;
+ }
+ if ((log_msg.entry.len != (4 + 1 + 8))
+ || (log_msg.id() != LOG_ID_EVENTS)) {
+ continue;
+ }
+
+ char* eventData = log_msg.msg();
+
+ if (eventData[4] != EVENT_TYPE_LONG) {
+ continue;
+ }
+ log_time tx(eventData + 4 + 1);
+ if (ts != tx) {
+ if (0xDEADBEEFA55A5AA6ULL == caught_convert(eventData + 4 + 1)) {
+ iters = i;
+ break;
+ }
+ continue;
+ }
+
+ break;
+ }
+ }
+
+ signal(SIGALRM, SIG_DFL);
+ alarm(0);
+
+ StopBenchmarkTiming();
+
+ android_logger_list_free(logger_list);
+}
+BENCHMARK(BM_log_delay);