From 864709302a80f26fa9da3be5b47304f0b8bae192 Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Sat, 6 Jun 2009 20:33:43 +0200 Subject: perf_counter tools: Move from Documentation/perf_counter/ to tools/perf/ Several people have suggested that 'perf' has become a full-fledged tool that should be moved out of Documentation/. Move it to the (new) tools/ directory. Cc: Peter Zijlstra Cc: Mike Galbraith Cc: Paul Mackerras Cc: Arnaldo Carvalho de Melo LKML-Reference: Signed-off-by: Ingo Molnar --- tools/perf/builtin-record.c | 544 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 544 insertions(+) create mode 100644 tools/perf/builtin-record.c (limited to 'tools/perf/builtin-record.c') diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c new file mode 100644 index 0000000..aeab9c4 --- /dev/null +++ b/tools/perf/builtin-record.c @@ -0,0 +1,544 @@ +/* + * builtin-record.c + * + * Builtin record command: Record the profile of a workload + * (or a CPU, or a PID) into the perf.data output file - for + * later analysis via perf report. + */ +#include "builtin.h" + +#include "perf.h" + +#include "util/util.h" +#include "util/parse-options.h" +#include "util/parse-events.h" +#include "util/string.h" + +#include +#include + +#define ALIGN(x, a) __ALIGN_MASK(x, (typeof(x))(a)-1) +#define __ALIGN_MASK(x, mask) (((x)+(mask))&~(mask)) + +static int fd[MAX_NR_CPUS][MAX_COUNTERS]; + +static long default_interval = 100000; + +static int nr_cpus = 0; +static unsigned int page_size; +static unsigned int mmap_pages = 128; +static int freq = 0; +static int output; +static const char *output_name = "perf.data"; +static int group = 0; +static unsigned int realtime_prio = 0; +static int system_wide = 0; +static pid_t target_pid = -1; +static int inherit = 1; +static int force = 0; +static int append_file = 0; + +static long samples; +static struct timeval last_read; +static struct timeval this_read; + +static __u64 bytes_written; + +static struct pollfd event_array[MAX_NR_CPUS * MAX_COUNTERS]; + +static int nr_poll; +static int nr_cpu; + +struct mmap_event { + struct perf_event_header header; + __u32 pid; + __u32 tid; + __u64 start; + __u64 len; + __u64 pgoff; + char filename[PATH_MAX]; +}; + +struct comm_event { + struct perf_event_header header; + __u32 pid; + __u32 tid; + char comm[16]; +}; + + +struct mmap_data { + int counter; + void *base; + unsigned int mask; + unsigned int prev; +}; + +static struct mmap_data mmap_array[MAX_NR_CPUS][MAX_COUNTERS]; + +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 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 mess up the samples 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) + samples++; + + 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) + die("failed to write"); + + size -= ret; + buf += ret; + + bytes_written += ret; + } + } + + buf = &data[old & md->mask]; + size = head - old; + old += size; + + while (size) { + int ret = write(output, buf, size); + + if (ret < 0) + die("failed to write"); + + size -= ret; + buf += ret; + + bytes_written += ret; + } + + md->prev = old; +} + +static volatile int done = 0; + +static void sig_handler(int sig) +{ + done = 1; +} + +static void pid_synthesize_comm_event(pid_t pid, int full) +{ + struct comm_event comm_ev; + char filename[PATH_MAX]; + char bf[BUFSIZ]; + int fd, ret; + size_t size; + char *field, *sep; + DIR *tasks; + struct dirent dirent, *next; + + snprintf(filename, sizeof(filename), "/proc/%d/stat", pid); + + fd = open(filename, O_RDONLY); + if (fd < 0) { + fprintf(stderr, "couldn't open %s\n", filename); + exit(EXIT_FAILURE); + } + if (read(fd, bf, sizeof(bf)) < 0) { + fprintf(stderr, "couldn't read %s\n", filename); + exit(EXIT_FAILURE); + } + close(fd); + + /* 9027 (cat) R 6747 9027 6747 34816 9027 ... */ + memset(&comm_ev, 0, sizeof(comm_ev)); + field = strchr(bf, '('); + if (field == NULL) + goto out_failure; + sep = strchr(++field, ')'); + if (sep == NULL) + goto out_failure; + size = sep - field; + memcpy(comm_ev.comm, field, size++); + + comm_ev.pid = pid; + comm_ev.header.type = PERF_EVENT_COMM; + size = ALIGN(size, sizeof(uint64_t)); + comm_ev.header.size = sizeof(comm_ev) - (sizeof(comm_ev.comm) - size); + + if (!full) { + comm_ev.tid = pid; + + ret = write(output, &comm_ev, comm_ev.header.size); + if (ret < 0) { + perror("failed to write"); + exit(-1); + } + return; + } + + snprintf(filename, sizeof(filename), "/proc/%d/task", pid); + + tasks = opendir(filename); + while (!readdir_r(tasks, &dirent, &next) && next) { + char *end; + pid = strtol(dirent.d_name, &end, 10); + if (*end) + continue; + + comm_ev.tid = pid; + + ret = write(output, &comm_ev, comm_ev.header.size); + if (ret < 0) { + perror("failed to write"); + exit(-1); + } + } + closedir(tasks); + return; + +out_failure: + fprintf(stderr, "couldn't get COMM and pgid, malformed %s\n", + filename); + exit(EXIT_FAILURE); +} + +static void pid_synthesize_mmap_samples(pid_t pid) +{ + char filename[PATH_MAX]; + FILE *fp; + + snprintf(filename, sizeof(filename), "/proc/%d/maps", pid); + + fp = fopen(filename, "r"); + if (fp == NULL) { + fprintf(stderr, "couldn't open %s\n", filename); + exit(EXIT_FAILURE); + } + while (1) { + char bf[BUFSIZ], *pbf = bf; + struct mmap_event mmap_ev = { + .header.type = PERF_EVENT_MMAP, + }; + int n; + size_t size; + if (fgets(bf, sizeof(bf), fp) == NULL) + break; + + /* 00400000-0040c000 r-xp 00000000 fd:01 41038 /bin/cat */ + n = hex2u64(pbf, &mmap_ev.start); + if (n < 0) + continue; + pbf += n + 1; + n = hex2u64(pbf, &mmap_ev.len); + if (n < 0) + continue; + pbf += n + 3; + if (*pbf == 'x') { /* vm_exec */ + char *execname = strrchr(bf, ' '); + + if (execname == NULL || execname[1] != '/') + continue; + + execname += 1; + size = strlen(execname); + execname[size - 1] = '\0'; /* Remove \n */ + memcpy(mmap_ev.filename, execname, size); + size = ALIGN(size, sizeof(uint64_t)); + mmap_ev.len -= mmap_ev.start; + mmap_ev.header.size = (sizeof(mmap_ev) - + (sizeof(mmap_ev.filename) - size)); + mmap_ev.pid = pid; + mmap_ev.tid = pid; + + if (write(output, &mmap_ev, mmap_ev.header.size) < 0) { + perror("failed to write"); + exit(-1); + } + } + } + + fclose(fp); +} + +static void synthesize_samples(void) +{ + DIR *proc; + struct dirent dirent, *next; + + proc = opendir("/proc"); + + while (!readdir_r(proc, &dirent, &next) && next) { + char *end; + pid_t pid; + + pid = strtol(dirent.d_name, &end, 10); + if (*end) /* only interested in proper numerical dirents */ + continue; + + pid_synthesize_comm_event(pid, 1); + pid_synthesize_mmap_samples(pid); + } + + closedir(proc); +} + +static int group_fd; + +static void create_counter(int counter, int cpu, pid_t pid) +{ + struct perf_counter_attr *attr = attrs + counter; + int track = 1; + + attr->sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TID | PERF_SAMPLE_PERIOD; + if (freq) { + attr->freq = 1; + attr->sample_freq = freq; + } + attr->mmap = track; + attr->comm = track; + attr->inherit = (cpu < 0) && inherit; + + track = 0; /* only the first counter needs these */ + + fd[nr_cpu][counter] = sys_perf_counter_open(attr, pid, cpu, group_fd, 0); + + if (fd[nr_cpu][counter] < 0) { + int err = errno; + + error("syscall returned with %d (%s)\n", + fd[nr_cpu][counter], strerror(err)); + if (err == EPERM) + printf("Are you root?\n"); + exit(-1); + } + assert(fd[nr_cpu][counter] >= 0); + fcntl(fd[nr_cpu][counter], F_SETFL, O_NONBLOCK); + + /* + * First counter acts as the group leader: + */ + if (group && group_fd == -1) + group_fd = fd[nr_cpu][counter]; + + event_array[nr_poll].fd = fd[nr_cpu][counter]; + event_array[nr_poll].events = POLLIN; + nr_poll++; + + mmap_array[nr_cpu][counter].counter = counter; + mmap_array[nr_cpu][counter].prev = 0; + mmap_array[nr_cpu][counter].mask = mmap_pages*page_size - 1; + mmap_array[nr_cpu][counter].base = mmap(NULL, (mmap_pages+1)*page_size, + PROT_READ, MAP_SHARED, fd[nr_cpu][counter], 0); + if (mmap_array[nr_cpu][counter].base == MAP_FAILED) { + error("failed to mmap with %d (%s)\n", errno, strerror(errno)); + exit(-1); + } +} + +static void open_counters(int cpu, pid_t pid) +{ + int counter; + + if (pid > 0) { + pid_synthesize_comm_event(pid, 0); + pid_synthesize_mmap_samples(pid); + } + + group_fd = -1; + for (counter = 0; counter < nr_counters; counter++) + create_counter(counter, cpu, pid); + + nr_cpu++; +} + +static int __cmd_record(int argc, const char **argv) +{ + int i, counter; + struct stat st; + pid_t pid; + int flags; + int ret; + + page_size = sysconf(_SC_PAGE_SIZE); + nr_cpus = sysconf(_SC_NPROCESSORS_ONLN); + assert(nr_cpus <= MAX_NR_CPUS); + assert(nr_cpus >= 0); + + if (!stat(output_name, &st) && !force && !append_file) { + fprintf(stderr, "Error, output file %s exists, use -A to append or -f to overwrite.\n", + output_name); + exit(-1); + } + + flags = O_CREAT|O_RDWR; + if (append_file) + flags |= O_APPEND; + else + flags |= O_TRUNC; + + output = open(output_name, flags, S_IRUSR|S_IWUSR); + if (output < 0) { + perror("failed to create output file"); + exit(-1); + } + + if (!system_wide) { + open_counters(-1, target_pid != -1 ? target_pid : getpid()); + } else for (i = 0; i < nr_cpus; i++) + open_counters(i, target_pid); + + signal(SIGCHLD, sig_handler); + signal(SIGINT, sig_handler); + + if (target_pid == -1 && argc) { + pid = fork(); + if (pid < 0) + perror("failed to fork"); + + if (!pid) { + if (execvp(argv[0], (char **)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); + } + } + + if (system_wide) + synthesize_samples(); + + while (!done) { + int hits = samples; + + for (i = 0; i < nr_cpu; i++) { + for (counter = 0; counter < nr_counters; counter++) + mmap_read(&mmap_array[i][counter]); + } + + if (hits == samples) + ret = poll(event_array, nr_poll, 100); + } + + /* + * Approximate RIP event size: 24 bytes. + */ + fprintf(stderr, + "[ perf record: Captured and wrote %.3f MB %s (~%lld samples) ]\n", + (double)bytes_written / 1024.0 / 1024.0, + output_name, + bytes_written / 24); + + return 0; +} + +static const char * const record_usage[] = { + "perf record [] []", + "perf record [] -- []", + NULL +}; + +static const struct option options[] = { + OPT_CALLBACK('e', "event", NULL, "event", + "event selector. use 'perf list' to list available events", + parse_events), + OPT_INTEGER('p', "pid", &target_pid, + "record events on existing pid"), + OPT_INTEGER('r', "realtime", &realtime_prio, + "collect data with this RT SCHED_FIFO priority"), + OPT_BOOLEAN('a', "all-cpus", &system_wide, + "system-wide collection from all CPUs"), + OPT_BOOLEAN('A', "append", &append_file, + "append to the output file to do incremental profiling"), + OPT_BOOLEAN('f', "force", &force, + "overwrite existing data file"), + OPT_LONG('c', "count", &default_interval, + "event period to sample"), + OPT_STRING('o', "output", &output_name, "file", + "output file name"), + OPT_BOOLEAN('i', "inherit", &inherit, + "child tasks inherit counters"), + OPT_INTEGER('F', "freq", &freq, + "profile at this frequency"), + OPT_INTEGER('m', "mmap-pages", &mmap_pages, + "number of mmap data pages"), + OPT_END() +}; + +int cmd_record(int argc, const char **argv, const char *prefix) +{ + int counter; + + argc = parse_options(argc, argv, options, record_usage, 0); + if (!argc && target_pid == -1 && !system_wide) + usage_with_options(record_usage, options); + + if (!nr_counters) + nr_counters = 1; + + for (counter = 0; counter < nr_counters; counter++) { + if (attrs[counter].sample_period) + continue; + + attrs[counter].sample_period = default_interval; + } + + return __cmd_record(argc, argv); +} -- cgit v1.1