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android_system_core/liblog/tests/liblog_benchmark.cpp

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/*
* 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 <fcntl.h>
#include <sys/endian.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#include <cutils/sockets.h>
#include <log/log.h>
#include <log/logger.h>
#include <log/log_read.h>
#include <private/android_logger.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 data to pstore
*/
static void BM_pmsg_short(int iters) {
int pstore_fd = TEMP_FAILURE_RETRY(open("/dev/pmsg0", O_WRONLY));
if (pstore_fd < 0) {
return;
}
/*
* struct {
* // what we provide to pstore
* android_pmsg_log_header_t pmsg_header;
* // what we provide to socket
* android_log_header_t header;
* // caller provides
* union {
* struct {
* char prio;
* char payload[];
* } string;
* struct {
* uint32_t tag
* char payload[];
* } binary;
* };
* };
*/
struct timespec ts;
clock_gettime(android_log_clockid(), &ts);
android_pmsg_log_header_t pmsg_header;
pmsg_header.magic = LOGGER_MAGIC;
pmsg_header.len = sizeof(android_pmsg_log_header_t)
+ sizeof(android_log_header_t);
pmsg_header.uid = getuid();
pmsg_header.pid = getpid();
android_log_header_t header;
header.tid = gettid();
header.realtime.tv_sec = ts.tv_sec;
header.realtime.tv_nsec = ts.tv_nsec;
static const unsigned nr = 1;
static const unsigned header_length = 2;
struct iovec newVec[nr + header_length];
newVec[0].iov_base = (unsigned char *) &pmsg_header;
newVec[0].iov_len = sizeof(pmsg_header);
newVec[1].iov_base = (unsigned char *) &header;
newVec[1].iov_len = sizeof(header);
android_log_event_int_t buffer;
header.id = LOG_ID_EVENTS;
buffer.header.tag = 0;
buffer.payload.type = EVENT_TYPE_INT;
uint32_t snapshot = 0;
buffer.payload.data = htole32(snapshot);
newVec[2].iov_base = &buffer;
newVec[2].iov_len = sizeof(buffer);
StartBenchmarkTiming();
for (int i = 0; i < iters; ++i) {
++snapshot;
buffer.payload.data = htole32(snapshot);
writev(pstore_fd, newVec, nr);
}
StopBenchmarkTiming();
close(pstore_fd);
}
BENCHMARK(BM_pmsg_short);
/*
* Measure the time it takes to submit the android logging data to pstore
* best case aligned single block.
*/
static void BM_pmsg_short_aligned(int iters) {
int pstore_fd = TEMP_FAILURE_RETRY(open("/dev/pmsg0", O_WRONLY));
if (pstore_fd < 0) {
return;
}
/*
* struct {
* // what we provide to pstore
* android_pmsg_log_header_t pmsg_header;
* // what we provide to socket
* android_log_header_t header;
* // caller provides
* union {
* struct {
* char prio;
* char payload[];
* } string;
* struct {
* uint32_t tag
* char payload[];
* } binary;
* };
* };
*/
struct timespec ts;
clock_gettime(android_log_clockid(), &ts);
struct packet {
android_pmsg_log_header_t pmsg_header;
android_log_header_t header;
android_log_event_int_t payload;
};
alignas(8) char buf[sizeof(struct packet) + 8];
memset(buf, 0, sizeof(buf));
struct packet *buffer = (struct packet*)(((uintptr_t)buf + 7) & ~7);
if (((uintptr_t)&buffer->pmsg_header) & 7) {
fprintf (stderr, "&buffer=0x%p iters=%d\n", &buffer->pmsg_header, iters);
}
buffer->pmsg_header.magic = LOGGER_MAGIC;
buffer->pmsg_header.len = sizeof(android_pmsg_log_header_t)
+ sizeof(android_log_header_t);
buffer->pmsg_header.uid = getuid();
buffer->pmsg_header.pid = getpid();
buffer->header.tid = gettid();
buffer->header.realtime.tv_sec = ts.tv_sec;
buffer->header.realtime.tv_nsec = ts.tv_nsec;
buffer->header.id = LOG_ID_EVENTS;
buffer->payload.header.tag = 0;
buffer->payload.payload.type = EVENT_TYPE_INT;
uint32_t snapshot = 0;
buffer->payload.payload.data = htole32(snapshot);
StartBenchmarkTiming();
for (int i = 0; i < iters; ++i) {
++snapshot;
buffer->payload.payload.data = htole32(snapshot);
write(pstore_fd, &buffer->pmsg_header,
sizeof(android_pmsg_log_header_t) +
sizeof(android_log_header_t) +
sizeof(android_log_event_int_t));
}
StopBenchmarkTiming();
close(pstore_fd);
}
BENCHMARK(BM_pmsg_short_aligned);
/*
* Measure the time it takes to submit the android logging data to pstore
* best case aligned single block.
*/
static void BM_pmsg_short_unaligned1(int iters) {
int pstore_fd = TEMP_FAILURE_RETRY(open("/dev/pmsg0", O_WRONLY));
if (pstore_fd < 0) {
return;
}
/*
* struct {
* // what we provide to pstore
* android_pmsg_log_header_t pmsg_header;
* // what we provide to socket
* android_log_header_t header;
* // caller provides
* union {
* struct {
* char prio;
* char payload[];
* } string;
* struct {
* uint32_t tag
* char payload[];
* } binary;
* };
* };
*/
struct timespec ts;
clock_gettime(android_log_clockid(), &ts);
struct packet {
android_pmsg_log_header_t pmsg_header;
android_log_header_t header;
android_log_event_int_t payload;
};
alignas(8) char buf[sizeof(struct packet) + 8];
memset(buf, 0, sizeof(buf));
struct packet *buffer = (struct packet*)((((uintptr_t)buf + 7) & ~7) + 1);
if ((((uintptr_t)&buffer->pmsg_header) & 7) != 1) {
fprintf (stderr, "&buffer=0x%p iters=%d\n", &buffer->pmsg_header, iters);
}
buffer->pmsg_header.magic = LOGGER_MAGIC;
buffer->pmsg_header.len = sizeof(android_pmsg_log_header_t)
+ sizeof(android_log_header_t);
buffer->pmsg_header.uid = getuid();
buffer->pmsg_header.pid = getpid();
buffer->header.tid = gettid();
buffer->header.realtime.tv_sec = ts.tv_sec;
buffer->header.realtime.tv_nsec = ts.tv_nsec;
buffer->header.id = LOG_ID_EVENTS;
buffer->payload.header.tag = 0;
buffer->payload.payload.type = EVENT_TYPE_INT;
uint32_t snapshot = 0;
buffer->payload.payload.data = htole32(snapshot);
StartBenchmarkTiming();
for (int i = 0; i < iters; ++i) {
++snapshot;
buffer->payload.payload.data = htole32(snapshot);
write(pstore_fd, &buffer->pmsg_header,
sizeof(android_pmsg_log_header_t) +
sizeof(android_log_header_t) +
sizeof(android_log_event_int_t));
}
StopBenchmarkTiming();
close(pstore_fd);
}
BENCHMARK(BM_pmsg_short_unaligned1);
/*
* Measure the time it takes to submit the android logging data to pstore
* best case aligned single block.
*/
static void BM_pmsg_long_aligned(int iters) {
int pstore_fd = TEMP_FAILURE_RETRY(open("/dev/pmsg0", O_WRONLY));
if (pstore_fd < 0) {
return;
}
/*
* struct {
* // what we provide to pstore
* android_pmsg_log_header_t pmsg_header;
* // what we provide to socket
* android_log_header_t header;
* // caller provides
* union {
* struct {
* char prio;
* char payload[];
* } string;
* struct {
* uint32_t tag
* char payload[];
* } binary;
* };
* };
*/
struct timespec ts;
clock_gettime(android_log_clockid(), &ts);
struct packet {
android_pmsg_log_header_t pmsg_header;
android_log_header_t header;
android_log_event_int_t payload;
};
alignas(8) char buf[sizeof(struct packet) + 8 + LOGGER_ENTRY_MAX_PAYLOAD];
memset(buf, 0, sizeof(buf));
struct packet *buffer = (struct packet*)(((uintptr_t)buf + 7) & ~7);
if (((uintptr_t)&buffer->pmsg_header) & 7) {
fprintf (stderr, "&buffer=0x%p iters=%d\n", &buffer->pmsg_header, iters);
}
buffer->pmsg_header.magic = LOGGER_MAGIC;
buffer->pmsg_header.len = sizeof(android_pmsg_log_header_t)
+ sizeof(android_log_header_t);
buffer->pmsg_header.uid = getuid();
buffer->pmsg_header.pid = getpid();
buffer->header.tid = gettid();
buffer->header.realtime.tv_sec = ts.tv_sec;
buffer->header.realtime.tv_nsec = ts.tv_nsec;
buffer->header.id = LOG_ID_EVENTS;
buffer->payload.header.tag = 0;
buffer->payload.payload.type = EVENT_TYPE_INT;
uint32_t snapshot = 0;
buffer->payload.payload.data = htole32(snapshot);
StartBenchmarkTiming();
for (int i = 0; i < iters; ++i) {
++snapshot;
buffer->payload.payload.data = htole32(snapshot);
write(pstore_fd, &buffer->pmsg_header, LOGGER_ENTRY_MAX_PAYLOAD);
}
StopBenchmarkTiming();
close(pstore_fd);
}
BENCHMARK(BM_pmsg_long_aligned);
/*
* Measure the time it takes to submit the android logging data to pstore
* best case aligned single block.
*/
static void BM_pmsg_long_unaligned1(int iters) {
int pstore_fd = TEMP_FAILURE_RETRY(open("/dev/pmsg0", O_WRONLY));
if (pstore_fd < 0) {
return;
}
/*
* struct {
* // what we provide to pstore
* android_pmsg_log_header_t pmsg_header;
* // what we provide to socket
* android_log_header_t header;
* // caller provides
* union {
* struct {
* char prio;
* char payload[];
* } string;
* struct {
* uint32_t tag
* char payload[];
* } binary;
* };
* };
*/
struct timespec ts;
clock_gettime(android_log_clockid(), &ts);
struct packet {
android_pmsg_log_header_t pmsg_header;
android_log_header_t header;
android_log_event_int_t payload;
};
alignas(8) char buf[sizeof(struct packet) + 8 + LOGGER_ENTRY_MAX_PAYLOAD];
memset(buf, 0, sizeof(buf));
struct packet *buffer = (struct packet*)((((uintptr_t)buf + 7) & ~7) + 1);
if ((((uintptr_t)&buffer->pmsg_header) & 7) != 1) {
fprintf (stderr, "&buffer=0x%p iters=%d\n", &buffer->pmsg_header, iters);
}
buffer->pmsg_header.magic = LOGGER_MAGIC;
buffer->pmsg_header.len = sizeof(android_pmsg_log_header_t)
+ sizeof(android_log_header_t);
buffer->pmsg_header.uid = getuid();
buffer->pmsg_header.pid = getpid();
buffer->header.tid = gettid();
buffer->header.realtime.tv_sec = ts.tv_sec;
buffer->header.realtime.tv_nsec = ts.tv_nsec;
buffer->header.id = LOG_ID_EVENTS;
buffer->payload.header.tag = 0;
buffer->payload.payload.type = EVENT_TYPE_INT;
uint32_t snapshot = 0;
buffer->payload.payload.data = htole32(snapshot);
StartBenchmarkTiming();
for (int i = 0; i < iters; ++i) {
++snapshot;
buffer->payload.payload.data = htole32(snapshot);
write(pstore_fd, &buffer->pmsg_header, LOGGER_ENTRY_MAX_PAYLOAD);
}
StopBenchmarkTiming();
close(pstore_fd);
}
BENCHMARK(BM_pmsg_long_unaligned1);
/*
* 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,
ANDROID_LOG_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((
ts = log_time(CLOCK_REALTIME),
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 || (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,
ANDROID_LOG_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 || (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);
/*
* 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);
/*
* Measure the time it takes for android_log_clockid.
*/
static void BM_clockid(int iters) {
StartBenchmarkTiming();
for (int i = 0; i < iters; ++i) {
android_log_clockid();
}
StopBenchmarkTiming();
}
BENCHMARK(BM_clockid);
/*
* Measure the time it takes for __android_log_security.
*/
static void BM_security(int iters) {
StartBenchmarkTiming();
for (int i = 0; i < iters; ++i) {
__android_log_security();
}
StopBenchmarkTiming();
}
BENCHMARK(BM_security);
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