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linux-next/Documentation/perf_counter/builtin-record.c
Ingo Molnar e33e0a4373 perf_counter tools: add 'perf record' command 
Move perf-record.c into the perf suite of commands.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-04-20 17:36:49 +02:00

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#define _GNU_SOURCE
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <unistd.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <getopt.h>
#include <assert.h>
#include <fcntl.h>
#include <stdio.h>
#include <errno.h>
#include <ctype.h>
#include <time.h>
#include <sched.h>
#include <pthread.h>
#include <sys/syscall.h>
#include <sys/ioctl.h>
#include <sys/poll.h>
#include <sys/prctl.h>
#include <sys/wait.h>
#include <sys/uio.h>
#include <sys/mman.h>
#include <linux/unistd.h>
#include <linux/types.h>
#include "../../include/linux/perf_counter.h"
/*
* prctl(PR_TASK_PERF_COUNTERS_DISABLE) will (cheaply) disable all
* counters in the current task.
*/
#define PR_TASK_PERF_COUNTERS_DISABLE 31
#define PR_TASK_PERF_COUNTERS_ENABLE 32
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
#define rdclock() \
({ \
struct timespec ts; \
\
clock_gettime(CLOCK_MONOTONIC, &ts); \
ts.tv_sec * 1000000000ULL + ts.tv_nsec; \
})
/*
* Pick up some kernel type conventions:
*/
#define __user
#define asmlinkage
#ifdef __x86_64__
#define __NR_perf_counter_open 295
#define rmb() asm volatile("lfence" ::: "memory")
#define cpu_relax() asm volatile("rep; nop" ::: "memory");
#endif
#ifdef __i386__
#define __NR_perf_counter_open 333
#define rmb() asm volatile("lfence" ::: "memory")
#define cpu_relax() asm volatile("rep; nop" ::: "memory");
#endif
#ifdef __powerpc__
#define __NR_perf_counter_open 319
#define rmb() asm volatile ("sync" ::: "memory")
#define cpu_relax() asm volatile ("" ::: "memory");
#endif
#define unlikely(x) __builtin_expect(!!(x), 0)
#define min(x, y) ({ \
typeof(x) _min1 = (x); \
typeof(y) _min2 = (y); \
(void) (&_min1 == &_min2); \
_min1 < _min2 ? _min1 : _min2; })
extern asmlinkage int sys_perf_counter_open(
struct perf_counter_hw_event *hw_event_uptr __user,
pid_t pid,
int cpu,
int group_fd,
unsigned long flags);
#define MAX_COUNTERS 64
#define MAX_NR_CPUS 256
#define EID(type, id) (((__u64)(type) << PERF_COUNTER_TYPE_SHIFT) | (id))
static int nr_counters = 0;
static __u64 event_id[MAX_COUNTERS] = { };
static int default_interval = 100000;
static int event_count[MAX_COUNTERS];
static int fd[MAX_NR_CPUS][MAX_COUNTERS];
static int nr_cpus = 0;
static unsigned int page_size;
static unsigned int mmap_pages = 16;
static int output;
static char *output_name = "output.perf";
static int group = 0;
static unsigned int realtime_prio = 0;
const unsigned int default_count[] = {
1000000,
1000000,
10000,
10000,
1000000,
10000,
};
struct event_symbol {
__u64 event;
char *symbol;
};
static struct event_symbol event_symbols[] = {
{EID(PERF_TYPE_HARDWARE, PERF_COUNT_CPU_CYCLES), "cpu-cycles", },
{EID(PERF_TYPE_HARDWARE, PERF_COUNT_CPU_CYCLES), "cycles", },
{EID(PERF_TYPE_HARDWARE, PERF_COUNT_INSTRUCTIONS), "instructions", },
{EID(PERF_TYPE_HARDWARE, PERF_COUNT_CACHE_REFERENCES), "cache-references", },
{EID(PERF_TYPE_HARDWARE, PERF_COUNT_CACHE_MISSES), "cache-misses", },
{EID(PERF_TYPE_HARDWARE, PERF_COUNT_BRANCH_INSTRUCTIONS), "branch-instructions", },
{EID(PERF_TYPE_HARDWARE, PERF_COUNT_BRANCH_INSTRUCTIONS), "branches", },
{EID(PERF_TYPE_HARDWARE, PERF_COUNT_BRANCH_MISSES), "branch-misses", },
{EID(PERF_TYPE_HARDWARE, PERF_COUNT_BUS_CYCLES), "bus-cycles", },
{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_CLOCK), "cpu-clock", },
{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_TASK_CLOCK), "task-clock", },
{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS), "page-faults", },
{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS), "faults", },
{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS_MIN), "minor-faults", },
{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS_MAJ), "major-faults", },
{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CONTEXT_SWITCHES), "context-switches", },
{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CONTEXT_SWITCHES), "cs", },
{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_MIGRATIONS), "cpu-migrations", },
{EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_MIGRATIONS), "migrations", },
};
/*
* Each event can have multiple symbolic names.
* Symbolic names are (almost) exactly matched.
*/
static __u64 match_event_symbols(char *str)
{
__u64 config, id;
int type;
unsigned int i;
if (sscanf(str, "r%llx", &config) == 1)
return config | PERF_COUNTER_RAW_MASK;
if (sscanf(str, "%d:%llu", &type, &id) == 2)
return EID(type, id);
for (i = 0; i < ARRAY_SIZE(event_symbols); i++) {
if (!strncmp(str, event_symbols[i].symbol,
strlen(event_symbols[i].symbol)))
return event_symbols[i].event;
}
return ~0ULL;
}
static int parse_events(char *str)
{
__u64 config;
again:
if (nr_counters == MAX_COUNTERS)
return -1;
config = match_event_symbols(str);
if (config == ~0ULL)
return -1;
event_id[nr_counters] = config;
nr_counters++;
str = strstr(str, ",");
if (str) {
str++;
goto again;
}
return 0;
}
#define __PERF_COUNTER_FIELD(config, name) \
((config & PERF_COUNTER_##name##_MASK) >> PERF_COUNTER_##name##_SHIFT)
#define PERF_COUNTER_RAW(config) __PERF_COUNTER_FIELD(config, RAW)
#define PERF_COUNTER_CONFIG(config) __PERF_COUNTER_FIELD(config, CONFIG)
#define PERF_COUNTER_TYPE(config) __PERF_COUNTER_FIELD(config, TYPE)
#define PERF_COUNTER_ID(config) __PERF_COUNTER_FIELD(config, EVENT)
static void display_events_help(void)
{
unsigned int i;
__u64 e;
printf(
" -e EVENT --event=EVENT # symbolic-name abbreviations");
for (i = 0; i < ARRAY_SIZE(event_symbols); i++) {
int type, id;
e = event_symbols[i].event;
type = PERF_COUNTER_TYPE(e);
id = PERF_COUNTER_ID(e);
printf("\n %d:%d: %-20s",
type, id, event_symbols[i].symbol);
}
printf("\n"
" rNNN: raw PMU events (eventsel+umask)\n\n");
}
static void display_help(void)
{
printf(
"Usage: perf-record [<options>]\n"
"perf-record Options (up to %d event types can be specified at once):\n\n",
MAX_COUNTERS);
display_events_help();
printf(
" -c CNT --count=CNT # event period to sample\n"
" -m pages --mmap_pages=<pages> # number of mmap data pages\n"
" -o file --output=<file> # output file\n"
" -r prio --realtime=<prio> # use RT prio\n"
);
exit(0);
}
static void process_options(int argc, char *argv[])
{
int error = 0, counter;
for (;;) {
int option_index = 0;
/** Options for getopt */
static struct option long_options[] = {
{"count", required_argument, NULL, 'c'},
{"event", required_argument, NULL, 'e'},
{"mmap_pages", required_argument, NULL, 'm'},
{"output", required_argument, NULL, 'o'},
{"realtime", required_argument, NULL, 'r'},
{NULL, 0, NULL, 0 }
};
int c = getopt_long(argc, argv, "+:c:e:m:o:r:",
long_options, &option_index);
if (c == -1)
break;
switch (c) {
case 'c': default_interval = atoi(optarg); break;
case 'e': error = parse_events(optarg); break;
case 'm': mmap_pages = atoi(optarg); break;
case 'o': output_name = strdup(optarg); break;
case 'r': realtime_prio = atoi(optarg); break;
default: error = 1; break;
}
}
if (error)
display_help();
if (!nr_counters) {
nr_counters = 1;
event_id[0] = 0;
}
for (counter = 0; counter < nr_counters; counter++) {
if (event_count[counter])
continue;
event_count[counter] = default_interval;
}
}
struct mmap_data {
int counter;
void *base;
unsigned int mask;
unsigned int prev;
};
static unsigned int mmap_read_head(struct mmap_data *md)
{
struct perf_counter_mmap_page *pc = md->base;
int head;
head = pc->data_head;
rmb();
return head;
}
static long events;
static struct timeval last_read, this_read;
static void mmap_read(struct mmap_data *md)
{
unsigned int head = mmap_read_head(md);
unsigned int old = md->prev;
unsigned char *data = md->base + page_size;
unsigned long size;
void *buf;
int diff;
gettimeofday(&this_read, NULL);
/*
* If we're further behind than half the buffer, there's a chance
* the writer will bite our tail and screw up the events under us.
*
* If we somehow ended up ahead of the head, we got messed up.
*
* In either case, truncate and restart at head.
*/
diff = head - old;
if (diff > md->mask / 2 || diff < 0) {
struct timeval iv;
unsigned long msecs;
timersub(&this_read, &last_read, &iv);
msecs = iv.tv_sec*1000 + iv.tv_usec/1000;
fprintf(stderr, "WARNING: failed to keep up with mmap data."
" Last read %lu msecs ago.\n", msecs);
/*
* head points to a known good entry, start there.
*/
old = head;
}
last_read = this_read;
if (old != head)
events++;
size = head - old;
if ((old & md->mask) + size != (head & md->mask)) {
buf = &data[old & md->mask];
size = md->mask + 1 - (old & md->mask);
old += size;
while (size) {
int ret = write(output, buf, size);
if (ret < 0) {
perror("failed to write");
exit(-1);
}
size -= ret;
buf += ret;
}
}
buf = &data[old & md->mask];
size = head - old;
old += size;
while (size) {
int ret = write(output, buf, size);
if (ret < 0) {
perror("failed to write");
exit(-1);
}
size -= ret;
buf += ret;
}
md->prev = old;
}
static volatile int done = 0;
static void sigchld_handler(int sig)
{
if (sig == SIGCHLD)
done = 1;
}
int cmd_record(int argc, const char **argv)
{
struct pollfd event_array[MAX_NR_CPUS * MAX_COUNTERS];
struct mmap_data mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
struct perf_counter_hw_event hw_event;
int i, counter, group_fd, nr_poll = 0;
pid_t pid;
int ret;
page_size = sysconf(_SC_PAGE_SIZE);
process_options(argc, argv);
nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
assert(nr_cpus <= MAX_NR_CPUS);
assert(nr_cpus >= 0);
output = open(output_name, O_CREAT|O_RDWR, S_IRWXU);
if (output < 0) {
perror("failed to create output file");
exit(-1);
}
argc -= optind;
argv += optind;
for (i = 0; i < nr_cpus; i++) {
group_fd = -1;
for (counter = 0; counter < nr_counters; counter++) {
memset(&hw_event, 0, sizeof(hw_event));
hw_event.config = event_id[counter];
hw_event.irq_period = event_count[counter];
hw_event.record_type = PERF_RECORD_IP | PERF_RECORD_TID;
hw_event.nmi = 1;
hw_event.mmap = 1;
hw_event.comm = 1;
fd[i][counter] = sys_perf_counter_open(&hw_event, -1, i, group_fd, 0);
if (fd[i][counter] < 0) {
int err = errno;
printf("kerneltop error: syscall returned with %d (%s)\n",
fd[i][counter], strerror(err));
if (err == EPERM)
printf("Are you root?\n");
exit(-1);
}
assert(fd[i][counter] >= 0);
fcntl(fd[i][counter], F_SETFL, O_NONBLOCK);
/*
* First counter acts as the group leader:
*/
if (group && group_fd == -1)
group_fd = fd[i][counter];
event_array[nr_poll].fd = fd[i][counter];
event_array[nr_poll].events = POLLIN;
nr_poll++;
mmap_array[i][counter].counter = counter;
mmap_array[i][counter].prev = 0;
mmap_array[i][counter].mask = mmap_pages*page_size - 1;
mmap_array[i][counter].base = mmap(NULL, (mmap_pages+1)*page_size,
PROT_READ, MAP_SHARED, fd[i][counter], 0);
if (mmap_array[i][counter].base == MAP_FAILED) {
printf("kerneltop error: failed to mmap with %d (%s)\n",
errno, strerror(errno));
exit(-1);
}
}
}
signal(SIGCHLD, sigchld_handler);
pid = fork();
if (pid < 0)
perror("failed to fork");
if (!pid) {
if (execvp(argv[0], argv)) {
perror(argv[0]);
exit(-1);
}
}
if (realtime_prio) {
struct sched_param param;
param.sched_priority = realtime_prio;
if (sched_setscheduler(0, SCHED_FIFO, &param)) {
printf("Could not set realtime priority.\n");
exit(-1);
}
}
/*
* TODO: store the current /proc/$/maps information somewhere
*/
while (!done) {
int hits = events;
for (i = 0; i < nr_cpus; i++) {
for (counter = 0; counter < nr_counters; counter++)
mmap_read(&mmap_array[i][counter]);
}
if (hits == events)
ret = poll(event_array, nr_poll, 100);
}
return 0;
}
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