liblog: Add cpu utilization test
- followup to measure CPU utilization in liblog to ensure this issue gets caught before a regression passes into the labs. Threshold for failure is 1%. BUG: 12457855 Change-Id: I40568a72aeef2f554b19ad55f3dd3c02bc023f24
This commit is contained in:
Mark Salyzyn
parent
8d1fdb5093
commit
edadb2e719
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@ -15,11 +15,27 @@
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*/
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#include <fcntl.h>
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#include <signal.h>
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#include <gtest/gtest.h>
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#include <log/log.h>
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#include <log/logger.h>
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#include <log/log_read.h>
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// enhanced version of LOG_FAILURE_RETRY to add support for EAGAIN and
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// non-syscall libs. Since we are only using this in the emergency of
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// a signal to stuff a terminating code into the logs, we will spin rather
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// than try a usleep.
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#define LOG_FAILURE_RETRY(exp) ({ \
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typeof (exp) _rc; \
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do { \
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_rc = (exp); \
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} while (((_rc == -1) \
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&& ((errno == EINTR) \
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|| (errno == EAGAIN))) \
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|| (_rc == -EINTR) \
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|| (_rc == -EAGAIN)); \
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_rc; })
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TEST(liblog, __android_log_buf_print) {
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ASSERT_LT(0, __android_log_buf_print(LOG_ID_RADIO, ANDROID_LOG_INFO,
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"TEST__android_log_buf_print",
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@ -142,6 +158,146 @@ TEST(liblog, __android_log_btwrite__android_logger_list_read) {
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android_logger_list_close(logger_list);
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}
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static unsigned signaled;
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log_time signal_time;
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static void caught_blocking(int signum)
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{
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unsigned long long v = 0xDEADBEEFA55A0000ULL;
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v += getpid() & 0xFFFF;
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++signaled;
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if ((signal_time.tv_sec == 0) && (signal_time.tv_nsec == 0)) {
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clock_gettime(CLOCK_MONOTONIC, &signal_time);
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signal_time.tv_sec += 2;
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}
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LOG_FAILURE_RETRY(__android_log_btwrite(0, EVENT_TYPE_LONG, &v, sizeof(v)));
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}
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// Fill in current process user and system time in 10ms increments
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static void get_ticks(unsigned long long *uticks, unsigned long long *sticks)
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{
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*uticks = *sticks = 0;
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pid_t pid = getpid();
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char buffer[512];
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snprintf(buffer, sizeof(buffer), "/proc/%u/stat", pid);
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FILE *fp = fopen(buffer, "r");
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if (!fp) {
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return;
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}
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char *cp = fgets(buffer, sizeof(buffer), fp);
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fclose(fp);
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if (!cp) {
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return;
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}
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pid_t d;
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char s[sizeof(buffer)];
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char c;
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long long ll;
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unsigned long long ull;
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if (15 != sscanf(buffer,
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"%d %s %c %lld %lld %lld %lld %lld %llu %llu %llu %llu %llu %llu %llu ",
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&d, s, &c, &ll, &ll, &ll, &ll, &ll, &ull, &ull, &ull, &ull, &ull,
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uticks, sticks)) {
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*uticks = *sticks = 0;
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}
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}
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TEST(liblog, android_logger_list_read__cpu) {
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struct logger_list *logger_list;
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unsigned long long v = 0xDEADBEEFA55A0000ULL;
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pid_t pid = getpid();
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v += pid & 0xFFFF;
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ASSERT_EQ(0, NULL == (logger_list = android_logger_list_open(
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LOG_ID_EVENTS, O_RDONLY, 1000, pid)));
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int count = 0;
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int signals = 0;
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unsigned long long uticks_start;
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unsigned long long sticks_start;
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get_ticks(&uticks_start, &sticks_start);
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const unsigned alarm_time = 10;
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memset(&signal_time, 0, sizeof(signal_time));
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signal(SIGALRM, caught_blocking);
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alarm(alarm_time);
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signaled = 0;
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do {
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log_msg log_msg;
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if (android_logger_list_read(logger_list, &log_msg) <= 0) {
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break;
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}
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alarm(alarm_time);
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++count;
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ASSERT_EQ(log_msg.entry.pid, pid);
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if ((log_msg.entry.len != (4 + 1 + 8))
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|| (log_msg.id() != LOG_ID_EVENTS)) {
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continue;
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}
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char *eventData = log_msg.msg();
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if (eventData[4] != EVENT_TYPE_LONG) {
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continue;
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}
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unsigned long long l = eventData[4 + 1 + 0] & 0xFF;
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l |= (unsigned long long) (eventData[4 + 1 + 1] & 0xFF) << 8;
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l |= (unsigned long long) (eventData[4 + 1 + 2] & 0xFF) << 16;
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l |= (unsigned long long) (eventData[4 + 1 + 3] & 0xFF) << 24;
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l |= (unsigned long long) (eventData[4 + 1 + 4] & 0xFF) << 32;
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l |= (unsigned long long) (eventData[4 + 1 + 5] & 0xFF) << 40;
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l |= (unsigned long long) (eventData[4 + 1 + 6] & 0xFF) << 48;
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l |= (unsigned long long) (eventData[4 + 1 + 7] & 0xFF) << 56;
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if (l == v) {
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++signals;
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break;
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}
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} while (!signaled || ({log_time t(CLOCK_MONOTONIC); t < signal_time;}));
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alarm(0);
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signal(SIGALRM, SIG_DFL);
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ASSERT_LT(1, count);
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ASSERT_EQ(1, signals);
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android_logger_list_close(logger_list);
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unsigned long long uticks_end;
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unsigned long long sticks_end;
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get_ticks(&uticks_end, &sticks_end);
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// Less than 1% in either user or system time, or both
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const unsigned long long one_percent_ticks = alarm_time;
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unsigned long long user_ticks = uticks_end - uticks_start;
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unsigned long long system_ticks = sticks_end - sticks_start;
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ASSERT_GT(one_percent_ticks, user_ticks);
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ASSERT_GT(one_percent_ticks, system_ticks);
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ASSERT_GT(one_percent_ticks, user_ticks + system_ticks);
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}
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TEST(liblog, android_logger_get_) {
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struct logger_list * logger_list = android_logger_list_alloc(O_WRONLY, 0, 0);
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