| /* |
| * Copyright (C) 2013 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 "benchmark.h" |
| |
| #include <sys/socket.h> |
| #include <cutils/sockets.h> |
| #include <log/log.h> |
| #include <log/logger.h> |
| |
| /* |
| * 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) { |
| TEMP_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); |
| |
| /* |
| * 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); |
| } |
| |
| for (int j = 0, i = 0; i < iters && j < 10*iters; ++i, ++j) { |
| log_time_t ts; |
| TEMP_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); |
| |
| 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_t tx(eventData + 4 + 1); |
| if (ts != tx) { |
| continue; |
| } |
| |
| uint64_t start = ts.nsec(); |
| uint64_t end = log_msg.nsec(); |
| if (end >= start) { |
| StartBenchmarkTiming(start); |
| StopBenchmarkTiming(end); |
| } else { |
| --i; |
| } |
| break; |
| } |
| } |
| |
| android_logger_list_free(logger_list); |
| } |
| BENCHMARK(BM_log_latency); |
| |
| /* |
| * 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); |
| } |
| |
| StartBenchmarkTiming(); |
| |
| for (int i = 0; i < iters; ++i) { |
| log_time_t ts; |
| |
| clock_gettime(CLOCK_REALTIME, &ts); |
| TEMP_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); |
| |
| 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_t tx(eventData + 4 + 1); |
| if (ts != tx) { |
| continue; |
| } |
| |
| break; |
| } |
| } |
| |
| StopBenchmarkTiming(); |
| |
| android_logger_list_free(logger_list); |
| } |
| BENCHMARK(BM_log_delay); |