* (or a CPU, or a PID) into the perf.data output file - for
* later analysis via perf report.
*/
+#define _FILE_OFFSET_BITS 64
+
#include "builtin.h"
#include "perf.h"
+#include "util/build-id.h"
#include "util/util.h"
#include "util/parse-options.h"
#include "util/parse-events.h"
-#include "util/string.h"
#include "util/header.h"
+#include "util/event.h"
+#include "util/debug.h"
+#include "util/session.h"
+#include "util/symbol.h"
+#include "util/cpumap.h"
#include <unistd.h>
#include <sched.h>
-#define ALIGN(x, a) __ALIGN_MASK(x, (typeof(x))(a)-1)
-#define __ALIGN_MASK(x, mask) (((x)+(mask))&~(mask))
+enum write_mode_t {
+ WRITE_FORCE,
+ WRITE_APPEND
+};
-static int fd[MAX_NR_CPUS][MAX_COUNTERS];
+static int *fd[MAX_NR_CPUS][MAX_COUNTERS];
-static long default_interval = 100000;
+static unsigned int user_interval = UINT_MAX;
+static long default_interval = 0;
-static int nr_cpus = 0;
+static int nr_cpus = 0;
static unsigned int page_size;
-static unsigned int mmap_pages = 128;
-static int freq = 0;
+static unsigned int mmap_pages = 128;
+static unsigned int user_freq = UINT_MAX;
+static int freq = 1000;
static int output;
+static int pipe_output = 0;
static const char *output_name = "perf.data";
-static int group = 0;
-static unsigned int realtime_prio = 0;
-static int system_wide = 0;
-static int profile_cpu = -1;
-static pid_t target_pid = -1;
-static int inherit = 1;
-static int force = 0;
-static int append_file = 0;
-static int call_graph = 0;
-static int verbose = 0;
-static int inherit_stat = 0;
-static int no_samples = 0;
-static int sample_address = 0;
-
-static long samples;
+static int group = 0;
+static unsigned int realtime_prio = 0;
+static bool raw_samples = false;
+static bool system_wide = false;
+static int profile_cpu = -1;
+static pid_t target_pid = -1;
+static pid_t target_tid = -1;
+static pid_t *all_tids = NULL;
+static int thread_num = 0;
+static pid_t child_pid = -1;
+static bool inherit = true;
+static enum write_mode_t write_mode = WRITE_FORCE;
+static bool call_graph = false;
+static bool inherit_stat = false;
+static bool no_samples = false;
+static bool sample_address = false;
+static bool multiplex = false;
+static int multiplex_fd = -1;
+
+static long samples = 0;
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 u64 bytes_written = 0;
-static int nr_poll;
-static int nr_cpu;
+static struct pollfd *event_array;
-static int file_new = 1;
-
-struct perf_header *header;
-
-struct mmap_event {
- struct perf_event_header header;
- u32 pid;
- u32 tid;
- u64 start;
- u64 len;
- u64 pgoff;
- char filename[PATH_MAX];
-};
+static int nr_poll = 0;
+static int nr_cpu = 0;
-struct comm_event {
- struct perf_event_header header;
- u32 pid;
- u32 tid;
- char comm[16];
-};
+static int file_new = 1;
+static off_t post_processing_offset;
+static struct perf_session *session;
struct mmap_data {
int counter;
unsigned int prev;
};
-static struct mmap_data mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
+static struct mmap_data *mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
static unsigned long mmap_read_head(struct mmap_data *md)
{
- struct perf_counter_mmap_page *pc = md->base;
+ struct perf_event_mmap_page *pc = md->base;
long head;
head = pc->data_head;
static void mmap_write_tail(struct mmap_data *md, unsigned long tail)
{
- struct perf_counter_mmap_page *pc = md->base;
+ struct perf_event_mmap_page *pc = md->base;
/*
* ensure all reads are done before we write the tail out.
pc->data_tail = tail;
}
+static void advance_output(size_t size)
+{
+ bytes_written += size;
+}
+
static void write_output(void *buf, size_t size)
{
while (size) {
}
}
+static int process_synthesized_event(event_t *event,
+ struct perf_session *self __used)
+{
+ write_output(event, event->header.size);
+ return 0;
+}
+
static void mmap_read(struct mmap_data *md)
{
unsigned int head = mmap_read_head(md);
static void sig_atexit(void)
{
+ if (child_pid != -1)
+ kill(child_pid, SIGTERM);
+
if (signr == -1)
return;
kill(getpid(), signr);
}
-static pid_t pid_synthesize_comm_event(pid_t pid, int full)
-{
- struct comm_event comm_ev;
- char filename[PATH_MAX];
- char bf[BUFSIZ];
- FILE *fp;
- size_t size = 0;
- DIR *tasks;
- struct dirent dirent, *next;
- pid_t tgid = 0;
-
- snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
-
- fp = fopen(filename, "r");
- if (fd == NULL) {
- /*
- * We raced with a task exiting - just return:
- */
- if (verbose)
- fprintf(stderr, "couldn't open %s\n", filename);
- return 0;
- }
-
- memset(&comm_ev, 0, sizeof(comm_ev));
- while (!comm_ev.comm[0] || !comm_ev.pid) {
- if (fgets(bf, sizeof(bf), fp) == NULL)
- goto out_failure;
-
- if (memcmp(bf, "Name:", 5) == 0) {
- char *name = bf + 5;
- while (*name && isspace(*name))
- ++name;
- size = strlen(name) - 1;
- memcpy(comm_ev.comm, name, size++);
- } else if (memcmp(bf, "Tgid:", 5) == 0) {
- char *tgids = bf + 5;
- while (*tgids && isspace(*tgids))
- ++tgids;
- tgid = comm_ev.pid = atoi(tgids);
- }
- }
-
- comm_ev.header.type = PERF_EVENT_COMM;
- size = ALIGN(size, sizeof(u64));
- comm_ev.header.size = sizeof(comm_ev) - (sizeof(comm_ev.comm) - size);
-
- if (!full) {
- comm_ev.tid = pid;
-
- write_output(&comm_ev, comm_ev.header.size);
- goto out_fclose;
- }
-
- 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;
-
- write_output(&comm_ev, comm_ev.header.size);
- }
- closedir(tasks);
-
-out_fclose:
- fclose(fp);
- return tgid;
-
-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, pid_t tgid)
-{
- char filename[PATH_MAX];
- FILE *fp;
-
- snprintf(filename, sizeof(filename), "/proc/%d/maps", pid);
-
- fp = fopen(filename, "r");
- if (fp == NULL) {
- /*
- * We raced with a task exiting - just return:
- */
- if (verbose)
- fprintf(stderr, "couldn't open %s\n", filename);
- return;
- }
- 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 = strchr(bf, '/');
-
- /* Catch VDSO */
- if (execname == NULL)
- execname = strstr(bf, "[vdso]");
-
- if (execname == NULL)
- continue;
-
- size = strlen(execname);
- execname[size - 1] = '\0'; /* Remove \n */
- memcpy(mmap_ev.filename, execname, size);
- size = ALIGN(size, sizeof(u64));
- mmap_ev.len -= mmap_ev.start;
- mmap_ev.header.size = (sizeof(mmap_ev) -
- (sizeof(mmap_ev.filename) - size));
- mmap_ev.pid = tgid;
- mmap_ev.tid = pid;
-
- write_output(&mmap_ev, mmap_ev.header.size);
- }
- }
-
- fclose(fp);
-}
-
-static void synthesize_all(void)
-{
- DIR *proc;
- struct dirent dirent, *next;
-
- proc = opendir("/proc");
-
- while (!readdir_r(proc, &dirent, &next) && next) {
- char *end;
- pid_t pid, tgid;
-
- pid = strtol(dirent.d_name, &end, 10);
- if (*end) /* only interested in proper numerical dirents */
- continue;
-
- tgid = pid_synthesize_comm_event(pid, 1);
- pid_synthesize_mmap_samples(pid, tgid);
- }
-
- closedir(proc);
-}
-
static int group_fd;
-static struct perf_header_attr *get_header_attr(struct perf_counter_attr *a, int nr)
+static struct perf_header_attr *get_header_attr(struct perf_event_attr *a, int nr)
{
struct perf_header_attr *h_attr;
- if (nr < header->attrs) {
- h_attr = header->attr[nr];
+ if (nr < session->header.attrs) {
+ h_attr = session->header.attr[nr];
} else {
h_attr = perf_header_attr__new(a);
- perf_header__add_attr(header, h_attr);
+ if (h_attr != NULL)
+ if (perf_header__add_attr(&session->header, h_attr) < 0) {
+ perf_header_attr__delete(h_attr);
+ h_attr = NULL;
+ }
}
return h_attr;
}
-static void create_counter(int counter, int cpu, pid_t pid)
+static void create_counter(int counter, int cpu)
{
- struct perf_counter_attr *attr = attrs + counter;
+ char *filter = filters[counter];
+ struct perf_event_attr *attr = attrs + counter;
struct perf_header_attr *h_attr;
int track = !counter; /* only the first counter needs these */
+ int thread_index;
+ int ret;
struct {
u64 count;
u64 time_enabled;
PERF_FORMAT_TOTAL_TIME_RUNNING |
PERF_FORMAT_ID;
- attr->sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TID;
+ attr->sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID;
+
+ if (nr_counters > 1)
+ attr->sample_type |= PERF_SAMPLE_ID;
- if (freq) {
- attr->sample_type |= PERF_SAMPLE_PERIOD;
- attr->freq = 1;
- attr->sample_freq = freq;
+ /*
+ * We default some events to a 1 default interval. But keep
+ * it a weak assumption overridable by the user.
+ */
+ if (!attr->sample_period || (user_freq != UINT_MAX &&
+ user_interval != UINT_MAX)) {
+ if (freq) {
+ attr->sample_type |= PERF_SAMPLE_PERIOD;
+ attr->freq = 1;
+ attr->sample_freq = freq;
+ } else {
+ attr->sample_period = default_interval;
+ }
}
if (no_samples)
if (call_graph)
attr->sample_type |= PERF_SAMPLE_CALLCHAIN;
+ if (raw_samples) {
+ attr->sample_type |= PERF_SAMPLE_TIME;
+ attr->sample_type |= PERF_SAMPLE_RAW;
+ attr->sample_type |= PERF_SAMPLE_CPU;
+ }
attr->mmap = track;
attr->comm = track;
- attr->inherit = (cpu < 0) && inherit;
- attr->disabled = 1;
+ attr->inherit = inherit;
+ if (target_pid == -1 && !system_wide) {
+ attr->disabled = 1;
+ attr->enable_on_exec = 1;
+ }
+ for (thread_index = 0; thread_index < thread_num; thread_index++) {
try_again:
- fd[nr_cpu][counter] = sys_perf_counter_open(attr, pid, cpu, group_fd, 0);
+ fd[nr_cpu][counter][thread_index] = sys_perf_event_open(attr,
+ all_tids[thread_index], cpu, group_fd, 0);
+
+ if (fd[nr_cpu][counter][thread_index] < 0) {
+ int err = errno;
+
+ if (err == EPERM || err == EACCES)
+ die("Permission error - are you root?\n"
+ "\t Consider tweaking"
+ " /proc/sys/kernel/perf_event_paranoid.\n");
+ else if (err == ENODEV && profile_cpu != -1) {
+ die("No such device - did you specify"
+ " an out-of-range profile CPU?\n");
+ }
- if (fd[nr_cpu][counter] < 0) {
- int err = errno;
+ /*
+ * If it's cycles then fall back to hrtimer
+ * based cpu-clock-tick sw counter, which
+ * is always available even if no PMU support:
+ */
+ if (attr->type == PERF_TYPE_HARDWARE
+ && attr->config == PERF_COUNT_HW_CPU_CYCLES) {
+
+ if (verbose)
+ warning(" ... trying to fall back to cpu-clock-ticks\n");
+ attr->type = PERF_TYPE_SOFTWARE;
+ attr->config = PERF_COUNT_SW_CPU_CLOCK;
+ goto try_again;
+ }
+ printf("\n");
+ error("perfcounter syscall returned with %d (%s)\n",
+ fd[nr_cpu][counter][thread_index], strerror(err));
+
+#if defined(__i386__) || defined(__x86_64__)
+ if (attr->type == PERF_TYPE_HARDWARE && err == EOPNOTSUPP)
+ die("No hardware sampling interrupt available."
+ " No APIC? If so then you can boot the kernel"
+ " with the \"lapic\" boot parameter to"
+ " force-enable it.\n");
+#endif
+
+ die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
+ exit(-1);
+ }
- if (err == EPERM)
- die("Permission error - are you root?\n");
- else if (err == ENODEV && profile_cpu != -1)
- die("No such device - did you specify an out-of-range profile CPU?\n");
+ h_attr = get_header_attr(attr, counter);
+ if (h_attr == NULL)
+ die("nomem\n");
- /*
- * If it's cycles then fall back to hrtimer
- * based cpu-clock-tick sw counter, which
- * is always available even if no PMU support:
- */
- if (attr->type == PERF_TYPE_HARDWARE
- && attr->config == PERF_COUNT_HW_CPU_CYCLES) {
-
- if (verbose)
- warning(" ... trying to fall back to cpu-clock-ticks\n");
- attr->type = PERF_TYPE_SOFTWARE;
- attr->config = PERF_COUNT_SW_CPU_CLOCK;
- goto try_again;
+ if (!file_new) {
+ if (memcmp(&h_attr->attr, attr, sizeof(*attr))) {
+ fprintf(stderr, "incompatible append\n");
+ exit(-1);
+ }
}
- printf("\n");
- error("perfcounter syscall returned with %d (%s)\n",
- fd[nr_cpu][counter], strerror(err));
- die("No CONFIG_PERF_COUNTERS=y kernel support configured?\n");
- exit(-1);
- }
- h_attr = get_header_attr(attr, counter);
+ if (read(fd[nr_cpu][counter][thread_index], &read_data, sizeof(read_data)) == -1) {
+ perror("Unable to read perf file descriptor\n");
+ exit(-1);
+ }
- if (!file_new) {
- if (memcmp(&h_attr->attr, attr, sizeof(*attr))) {
- fprintf(stderr, "incompatible append\n");
+ if (perf_header_attr__add_id(h_attr, read_data.id) < 0) {
+ pr_warning("Not enough memory to add id\n");
exit(-1);
}
- }
- if (read(fd[nr_cpu][counter], &read_data, sizeof(read_data)) == -1) {
- perror("Unable to read perf file descriptor\n");
- exit(-1);
- }
+ assert(fd[nr_cpu][counter][thread_index] >= 0);
+ fcntl(fd[nr_cpu][counter][thread_index], F_SETFL, O_NONBLOCK);
- perf_header_attr__add_id(h_attr, read_data.id);
+ /*
+ * First counter acts as the group leader:
+ */
+ if (group && group_fd == -1)
+ group_fd = fd[nr_cpu][counter][thread_index];
+ if (multiplex && multiplex_fd == -1)
+ multiplex_fd = fd[nr_cpu][counter][thread_index];
- assert(fd[nr_cpu][counter] >= 0);
- fcntl(fd[nr_cpu][counter], F_SETFL, O_NONBLOCK);
+ if (multiplex && fd[nr_cpu][counter][thread_index] != multiplex_fd) {
- /*
- * 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|PROT_WRITE, 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);
- }
+ ret = ioctl(fd[nr_cpu][counter][thread_index], PERF_EVENT_IOC_SET_OUTPUT, multiplex_fd);
+ assert(ret != -1);
+ } else {
+ event_array[nr_poll].fd = fd[nr_cpu][counter][thread_index];
+ event_array[nr_poll].events = POLLIN;
+ nr_poll++;
+
+ mmap_array[nr_cpu][counter][thread_index].counter = counter;
+ mmap_array[nr_cpu][counter][thread_index].prev = 0;
+ mmap_array[nr_cpu][counter][thread_index].mask = mmap_pages*page_size - 1;
+ mmap_array[nr_cpu][counter][thread_index].base = mmap(NULL, (mmap_pages+1)*page_size,
+ PROT_READ|PROT_WRITE, MAP_SHARED, fd[nr_cpu][counter][thread_index], 0);
+ if (mmap_array[nr_cpu][counter][thread_index].base == MAP_FAILED) {
+ error("failed to mmap with %d (%s)\n", errno, strerror(errno));
+ exit(-1);
+ }
+ }
- ioctl(fd[nr_cpu][counter], PERF_COUNTER_IOC_ENABLE);
+ if (filter != NULL) {
+ ret = ioctl(fd[nr_cpu][counter][thread_index],
+ PERF_EVENT_IOC_SET_FILTER, filter);
+ if (ret) {
+ error("failed to set filter with %d (%s)\n", errno,
+ strerror(errno));
+ exit(-1);
+ }
+ }
+ }
}
-static void open_counters(int cpu, pid_t pid)
+static void open_counters(int cpu)
{
int counter;
group_fd = -1;
for (counter = 0; counter < nr_counters; counter++)
- create_counter(counter, cpu, pid);
+ create_counter(counter, cpu);
nr_cpu++;
}
+static int process_buildids(void)
+{
+ u64 size = lseek(output, 0, SEEK_CUR);
+
+ if (size == 0)
+ return 0;
+
+ session->fd = output;
+ return __perf_session__process_events(session, post_processing_offset,
+ size - post_processing_offset,
+ size, &build_id__mark_dso_hit_ops);
+}
+
static void atexit_header(void)
{
- header->data_size += bytes_written;
+ if (!pipe_output) {
+ session->header.data_size += bytes_written;
- perf_header__write(header, output);
+ process_buildids();
+ perf_header__write(&session->header, output, true);
+ } else {
+ int err;
+
+ err = event__synthesize_build_ids(process_synthesized_event,
+ session);
+ if (err < 0)
+ pr_err("Couldn't synthesize build ids.\n");
+ }
}
static int __cmd_record(int argc, const char **argv)
struct stat st;
pid_t pid = 0;
int flags;
- int ret;
+ int err;
+ unsigned long waking = 0;
+ int child_ready_pipe[2], go_pipe[2];
+ const bool forks = argc > 0;
+ char buf;
page_size = sysconf(_SC_PAGE_SIZE);
- nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
- assert(nr_cpus <= MAX_NR_CPUS);
- assert(nr_cpus >= 0);
atexit(sig_atexit);
signal(SIGCHLD, sig_handler);
signal(SIGINT, sig_handler);
- if (!stat(output_name, &st) && st.st_size) {
- if (!force && !append_file) {
- fprintf(stderr, "Error, output file %s exists, use -A to append or -f to overwrite.\n",
- output_name);
- exit(-1);
+ if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
+ perror("failed to create pipes");
+ exit(-1);
+ }
+
+ if (!strcmp(output_name, "-"))
+ pipe_output = 1;
+ else if (!stat(output_name, &st) && st.st_size) {
+ if (write_mode == WRITE_FORCE) {
+ char oldname[PATH_MAX];
+ snprintf(oldname, sizeof(oldname), "%s.old",
+ output_name);
+ unlink(oldname);
+ rename(output_name, oldname);
}
- } else {
- append_file = 0;
+ } else if (write_mode == WRITE_APPEND) {
+ write_mode = WRITE_FORCE;
}
flags = O_CREAT|O_RDWR;
- if (append_file)
+ if (write_mode == WRITE_APPEND)
file_new = 0;
else
flags |= O_TRUNC;
- output = open(output_name, flags, S_IRUSR|S_IWUSR);
+ if (pipe_output)
+ output = STDOUT_FILENO;
+ else
+ output = open(output_name, flags, S_IRUSR | S_IWUSR);
if (output < 0) {
perror("failed to create output file");
exit(-1);
}
- if (!file_new)
- header = perf_header__read(output);
- else
- header = perf_header__new();
+ session = perf_session__new(output_name, O_WRONLY,
+ write_mode == WRITE_FORCE);
+ if (session == NULL) {
+ pr_err("Not enough memory for reading perf file header\n");
+ return -1;
+ }
+
+ if (!file_new) {
+ err = perf_header__read(session, output);
+ if (err < 0)
+ return err;
+ }
+
+ if (raw_samples) {
+ perf_header__set_feat(&session->header, HEADER_TRACE_INFO);
+ } else {
+ for (i = 0; i < nr_counters; i++) {
+ if (attrs[i].sample_type & PERF_SAMPLE_RAW) {
+ perf_header__set_feat(&session->header, HEADER_TRACE_INFO);
+ break;
+ }
+ }
+ }
atexit(atexit_header);
- if (!system_wide) {
- pid = target_pid;
- if (pid == -1)
- pid = getpid();
+ if (forks) {
+ child_pid = fork();
+ if (pid < 0) {
+ perror("failed to fork");
+ exit(-1);
+ }
+
+ if (!child_pid) {
+ if (pipe_output)
+ dup2(2, 1);
+ close(child_ready_pipe[0]);
+ close(go_pipe[1]);
+ fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
+
+ /*
+ * Do a dummy execvp to get the PLT entry resolved,
+ * so we avoid the resolver overhead on the real
+ * execvp call.
+ */
+ execvp("", (char **)argv);
+
+ /*
+ * Tell the parent we're ready to go
+ */
+ close(child_ready_pipe[1]);
+
+ /*
+ * Wait until the parent tells us to go.
+ */
+ if (read(go_pipe[0], &buf, 1) == -1)
+ perror("unable to read pipe");
+
+ execvp(argv[0], (char **)argv);
+
+ perror(argv[0]);
+ exit(-1);
+ }
- open_counters(profile_cpu, pid);
- } else {
- if (profile_cpu != -1) {
- open_counters(profile_cpu, target_pid);
- } else {
- for (i = 0; i < nr_cpus; i++)
- open_counters(i, target_pid);
+ if (!system_wide && target_tid == -1 && target_pid == -1)
+ all_tids[0] = child_pid;
+
+ close(child_ready_pipe[1]);
+ close(go_pipe[0]);
+ /*
+ * wait for child to settle
+ */
+ if (read(child_ready_pipe[0], &buf, 1) == -1) {
+ perror("unable to read pipe");
+ exit(-1);
}
+ close(child_ready_pipe[0]);
}
- if (file_new)
- perf_header__write(header, output);
+ if ((!system_wide && !inherit) || profile_cpu != -1) {
+ open_counters(profile_cpu);
+ } else {
+ nr_cpus = read_cpu_map();
+ for (i = 0; i < nr_cpus; i++)
+ open_counters(cpumap[i]);
+ }
- if (!system_wide) {
- pid_t tgid = pid_synthesize_comm_event(pid, 0);
- pid_synthesize_mmap_samples(pid, tgid);
- } else
- synthesize_all();
+ if (pipe_output) {
+ err = perf_header__write_pipe(output);
+ if (err < 0)
+ return err;
+ } else if (file_new) {
+ err = perf_header__write(&session->header, output, false);
+ if (err < 0)
+ return err;
+ }
- if (target_pid == -1 && argc) {
- pid = fork();
- if (pid < 0)
- perror("failed to fork");
+ post_processing_offset = lseek(output, 0, SEEK_CUR);
- if (!pid) {
- if (execvp(argv[0], (char **)argv)) {
- perror(argv[0]);
- exit(-1);
- }
+ if (pipe_output) {
+ err = event__synthesize_attrs(&session->header,
+ process_synthesized_event,
+ session);
+ if (err < 0) {
+ pr_err("Couldn't synthesize attrs.\n");
+ return err;
}
+
+ err = event__synthesize_event_types(process_synthesized_event,
+ session);
+ if (err < 0) {
+ pr_err("Couldn't synthesize event_types.\n");
+ return err;
+ }
+
+ err = event__synthesize_tracing_data(output, attrs,
+ nr_counters,
+ process_synthesized_event,
+ session);
+ if (err <= 0) {
+ pr_err("Couldn't record tracing data.\n");
+ return err;
+ }
+
+ advance_output(err);
}
+ err = event__synthesize_kernel_mmap(process_synthesized_event,
+ session, "_text");
+ if (err < 0)
+ err = event__synthesize_kernel_mmap(process_synthesized_event,
+ session, "_stext");
+ if (err < 0) {
+ pr_err("Couldn't record kernel reference relocation symbol.\n");
+ return err;
+ }
+
+ err = event__synthesize_modules(process_synthesized_event, session);
+ if (err < 0) {
+ pr_err("Couldn't record kernel reference relocation symbol.\n");
+ return err;
+ }
+
+ if (!system_wide && profile_cpu == -1)
+ event__synthesize_thread(target_tid, process_synthesized_event,
+ session);
+ else
+ event__synthesize_threads(process_synthesized_event, session);
+
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");
+ pr_err("Could not set realtime priority.\n");
exit(-1);
}
}
+ /*
+ * Let the child rip
+ */
+ if (forks)
+ close(go_pipe[1]);
+
for (;;) {
int hits = samples;
+ int thread;
for (i = 0; i < nr_cpu; i++) {
- for (counter = 0; counter < nr_counters; counter++)
- mmap_read(&mmap_array[i][counter]);
+ for (counter = 0; counter < nr_counters; counter++) {
+ for (thread = 0;
+ thread < thread_num; thread++) {
+ if (mmap_array[i][counter][thread].base)
+ mmap_read(&mmap_array[i][counter][thread]);
+ }
+
+ }
}
if (hits == samples) {
if (done)
break;
- ret = poll(event_array, nr_poll, 100);
+ err = poll(event_array, nr_poll, -1);
+ waking++;
+ }
+
+ if (done) {
+ for (i = 0; i < nr_cpu; i++) {
+ for (counter = 0;
+ counter < nr_counters;
+ counter++) {
+ for (thread = 0;
+ thread < thread_num;
+ thread++)
+ ioctl(fd[i][counter][thread],
+ PERF_EVENT_IOC_DISABLE);
+ }
+ }
}
}
+ fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
+
/*
* Approximate RIP event size: 24 bytes.
*/
NULL
};
+static bool force, append_file;
+
static const struct option options[] = {
OPT_CALLBACK('e', "event", NULL, "event",
"event selector. use 'perf list' to list available events",
parse_events),
+ OPT_CALLBACK(0, "filter", NULL, "filter",
+ "event filter", parse_filter),
OPT_INTEGER('p', "pid", &target_pid,
- "record events on existing pid"),
+ "record events on existing process id"),
+ OPT_INTEGER('t', "tid", &target_tid,
+ "record events on existing thread id"),
OPT_INTEGER('r', "realtime", &realtime_prio,
"collect data with this RT SCHED_FIFO priority"),
+ OPT_BOOLEAN('R', "raw-samples", &raw_samples,
+ "collect raw sample records from all opened counters"),
OPT_BOOLEAN('a', "all-cpus", &system_wide,
"system-wide collection from all CPUs"),
OPT_BOOLEAN('A', "append", &append_file,
OPT_INTEGER('C', "profile_cpu", &profile_cpu,
"CPU to profile on"),
OPT_BOOLEAN('f', "force", &force,
- "overwrite existing data file"),
- OPT_LONG('c', "count", &default_interval,
+ "overwrite existing data file (deprecated)"),
+ OPT_LONG('c', "count", &user_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,
+ OPT_INTEGER('F', "freq", &user_freq,
"profile at this frequency"),
OPT_INTEGER('m', "mmap-pages", &mmap_pages,
"number of mmap data pages"),
OPT_BOOLEAN('g', "call-graph", &call_graph,
"do call-graph (stack chain/backtrace) recording"),
- OPT_BOOLEAN('v', "verbose", &verbose,
+ OPT_INCR('v', "verbose", &verbose,
"be more verbose (show counter open errors, etc)"),
OPT_BOOLEAN('s', "stat", &inherit_stat,
"per thread counts"),
"Sample addresses"),
OPT_BOOLEAN('n', "no-samples", &no_samples,
"don't sample"),
+ OPT_BOOLEAN('M', "multiplex", &multiplex,
+ "multiplex counter output in a single channel"),
OPT_END()
};
int cmd_record(int argc, const char **argv, const char *prefix __used)
{
- int counter;
+ int i,j;
argc = parse_options(argc, argv, options, record_usage,
- PARSE_OPT_STOP_AT_NON_OPTION);
- if (!argc && target_pid == -1 && !system_wide)
+ PARSE_OPT_STOP_AT_NON_OPTION);
+ if (!argc && target_pid == -1 && target_tid == -1 &&
+ !system_wide && profile_cpu == -1)
usage_with_options(record_usage, options);
+ if (force && append_file) {
+ fprintf(stderr, "Can't overwrite and append at the same time."
+ " You need to choose between -f and -A");
+ usage_with_options(record_usage, options);
+ } else if (append_file) {
+ write_mode = WRITE_APPEND;
+ } else {
+ write_mode = WRITE_FORCE;
+ }
+
+ symbol__init();
+
if (!nr_counters) {
nr_counters = 1;
attrs[0].type = PERF_TYPE_HARDWARE;
attrs[0].config = PERF_COUNT_HW_CPU_CYCLES;
}
- for (counter = 0; counter < nr_counters; counter++) {
- if (attrs[counter].sample_period)
- continue;
+ if (target_pid != -1) {
+ target_tid = target_pid;
+ thread_num = find_all_tid(target_pid, &all_tids);
+ if (thread_num <= 0) {
+ fprintf(stderr, "Can't find all threads of pid %d\n",
+ target_pid);
+ usage_with_options(record_usage, options);
+ }
+ } else {
+ all_tids=malloc(sizeof(pid_t));
+ if (!all_tids)
+ return -ENOMEM;
+
+ all_tids[0] = target_tid;
+ thread_num = 1;
+ }
- attrs[counter].sample_period = default_interval;
+ for (i = 0; i < MAX_NR_CPUS; i++) {
+ for (j = 0; j < MAX_COUNTERS; j++) {
+ fd[i][j] = malloc(sizeof(int)*thread_num);
+ mmap_array[i][j] = zalloc(
+ sizeof(struct mmap_data)*thread_num);
+ if (!fd[i][j] || !mmap_array[i][j])
+ return -ENOMEM;
+ }
+ }
+ event_array = malloc(
+ sizeof(struct pollfd)*MAX_NR_CPUS*MAX_COUNTERS*thread_num);
+ if (!event_array)
+ return -ENOMEM;
+
+ if (user_interval != UINT_MAX)
+ default_interval = user_interval;
+ if (user_freq != UINT_MAX)
+ freq = user_freq;
+
+ /*
+ * User specified count overrides default frequency.
+ */
+ if (default_interval)
+ freq = 0;
+ else if (freq) {
+ default_interval = freq;
+ } else {
+ fprintf(stderr, "frequency and count are zero, aborting\n");
+ exit(EXIT_FAILURE);
}
return __cmd_record(argc, argv);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff