#include "util/util.h" #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" #include "perf.h" 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, 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, ¶m)) { 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; }