#include "util/parse-events.h"
#include "util/string.h"
+#include "util/header.h"
+#include "util/event.h"
+#include "util/debug.h"
+#include "util/trace-event.h"
+
#include <unistd.h>
#include <sched.h>
static const char *output_name = "perf.data";
static int group = 0;
static unsigned int realtime_prio = 0;
+static int raw_samples = 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 verbose = 0;
+static int call_graph = 0;
+static int inherit_stat = 0;
+static int no_samples = 0;
+static int sample_address = 0;
+static int multiplex = 0;
+static int multiplex_fd = -1;
static long samples;
static struct timeval last_read;
static struct timeval this_read;
-static __u64 bytes_written;
+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];
-};
+static int file_new = 1;
+struct perf_header *header;
struct mmap_data {
int counter;
static struct mmap_data mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
-static unsigned int mmap_read_head(struct mmap_data *md)
+static unsigned long mmap_read_head(struct mmap_data *md)
{
struct perf_counter_mmap_page *pc = md->base;
- int head;
+ long head;
head = pc->data_head;
rmb();
return head;
}
+static void mmap_write_tail(struct mmap_data *md, unsigned long tail)
+{
+ struct perf_counter_mmap_page *pc = md->base;
+
+ /*
+ * ensure all reads are done before we write the tail out.
+ */
+ /* mb(); */
+ pc->data_tail = tail;
+}
+
+static void write_output(void *buf, size_t size)
+{
+ while (size) {
+ int ret = write(output, buf, size);
+
+ if (ret < 0)
+ die("failed to write");
+
+ size -= ret;
+ buf += ret;
+
+ bytes_written += ret;
+ }
+}
+
static void mmap_read(struct mmap_data *md)
{
unsigned int head = mmap_read_head(md);
* In either case, truncate and restart at head.
*/
diff = head - old;
- if (diff > md->mask / 2 || diff < 0) {
+ if (diff < 0) {
struct timeval iv;
unsigned long msecs;
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;
- }
+ write_output(buf, size);
}
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;
- }
+ write_output(buf, size);
md->prev = old;
+ mmap_write_tail(md, old);
}
static volatile int done = 0;
kill(getpid(), signr);
}
-static void pid_synthesize_comm_event(pid_t pid, int full)
+static pid_t 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;
+ FILE *fp;
+ size_t size = 0;
DIR *tasks;
struct dirent dirent, *next;
+ pid_t tgid = 0;
- snprintf(filename, sizeof(filename), "/proc/%d/stat", pid);
+ snprintf(filename, sizeof(filename), "/proc/%d/status", 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);
+ 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 0;
}
- 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;
+ 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));
+ size = ALIGN(size, sizeof(u64));
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;
+ write_output(&comm_ev, comm_ev.header.size);
+ goto out_fclose;
}
snprintf(filename, sizeof(filename), "/proc/%d/task", pid);
comm_ev.tid = pid;
- ret = write(output, &comm_ev, comm_ev.header.size);
- if (ret < 0) {
- perror("failed to write");
- exit(-1);
- }
+ write_output(&comm_ev, comm_ev.header.size);
}
closedir(tasks);
- return;
+
+out_fclose:
+ fclose(fp);
+ return tgid;
out_failure:
fprintf(stderr, "couldn't get COMM and pgid, malformed %s\n",
exit(EXIT_FAILURE);
}
-static void pid_synthesize_mmap_samples(pid_t pid)
+static void pid_synthesize_mmap_samples(pid_t pid, pid_t tgid)
{
char filename[PATH_MAX];
FILE *fp;
fp = fopen(filename, "r");
if (fp == NULL) {
- fprintf(stderr, "couldn't open %s\n", filename);
- exit(EXIT_FAILURE);
+ /*
+ * 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,
+ .header = { .type = PERF_EVENT_MMAP },
};
int n;
size_t size;
continue;
pbf += n + 3;
if (*pbf == 'x') { /* vm_exec */
- char *execname = strrchr(bf, ' ');
+ char *execname = strchr(bf, '/');
- if (execname == NULL || execname[1] != '/')
+ /* Catch VDSO */
+ if (execname == NULL)
+ execname = strstr(bf, "[vdso]");
+
+ if (execname == NULL)
continue;
- execname += 1;
size = strlen(execname);
execname[size - 1] = '\0'; /* Remove \n */
memcpy(mmap_ev.filename, execname, size);
- size = ALIGN(size, sizeof(__u64));
+ 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 = pid;
+ mmap_ev.pid = tgid;
mmap_ev.tid = pid;
- if (write(output, &mmap_ev, mmap_ev.header.size) < 0) {
- perror("failed to write");
- exit(-1);
- }
+ write_output(&mmap_ev, mmap_ev.header.size);
}
}
fclose(fp);
}
-static void synthesize_samples(void)
+static void synthesize_all(void)
{
DIR *proc;
struct dirent dirent, *next;
while (!readdir_r(proc, &dirent, &next) && next) {
char *end;
- pid_t pid;
+ pid_t pid, tgid;
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);
+ 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)
+{
+ struct perf_header_attr *h_attr;
+
+ if (nr < header->attrs) {
+ h_attr = header->attr[nr];
+ } else {
+ h_attr = perf_header_attr__new(a);
+ perf_header__add_attr(header, h_attr);
+ }
+
+ return h_attr;
+}
+
static void create_counter(int counter, int cpu, pid_t pid)
{
struct perf_counter_attr *attr = attrs + counter;
- int track = 1;
+ struct perf_header_attr *h_attr;
+ int track = !counter; /* only the first counter needs these */
+ struct {
+ u64 count;
+ u64 time_enabled;
+ u64 time_running;
+ u64 id;
+ } read_data;
+
+ attr->read_format = PERF_FORMAT_TOTAL_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 (freq) {
attr->sample_type |= PERF_SAMPLE_PERIOD;
attr->freq = 1;
attr->sample_freq = freq;
}
+
+ if (no_samples)
+ attr->sample_freq = 0;
+
+ if (inherit_stat)
+ attr->inherit_stat = 1;
+
+ if (sample_address)
+ attr->sample_type |= PERF_SAMPLE_ADDR;
+
+ 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;
- track = 0; /* only the first counter needs these */
-
try_again:
fd[nr_cpu][counter] = sys_perf_counter_open(attr, pid, cpu, group_fd, 0);
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");
/*
* If it's cycles then fall back to hrtimer
exit(-1);
}
+ h_attr = get_header_attr(attr, counter);
+
+ if (!file_new) {
+ if (memcmp(&h_attr->attr, attr, sizeof(*attr))) {
+ fprintf(stderr, "incompatible append\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);
+ }
+
+ perf_header_attr__add_id(h_attr, read_data.id);
+
assert(fd[nr_cpu][counter] >= 0);
fcntl(fd[nr_cpu][counter], F_SETFL, O_NONBLOCK);
*/
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);
+ if (multiplex && multiplex_fd == -1)
+ multiplex_fd = fd[nr_cpu][counter];
+
+ if (multiplex && fd[nr_cpu][counter] != multiplex_fd) {
+ int ret;
+
+ ret = ioctl(fd[nr_cpu][counter], PERF_COUNTER_IOC_SET_OUTPUT, multiplex_fd);
+ assert(ret != -1);
+ } else {
+ 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);
+ }
}
ioctl(fd[nr_cpu][counter], PERF_COUNTER_IOC_ENABLE);
{
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 void atexit_header(void)
+{
+ header->data_size += bytes_written;
+
+ perf_header__write(header, output);
+}
+
static int __cmd_record(int argc, const char **argv)
{
int i, counter;
struct stat st;
- pid_t pid;
+ pid_t pid = 0;
int flags;
int ret;
+ unsigned long waking = 0;
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);
+ 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);
+ }
+ } else {
+ append_file = 0;
}
flags = O_CREAT|O_RDWR;
if (append_file)
- flags |= O_APPEND;
+ file_new = 0;
else
flags |= O_TRUNC;
exit(-1);
}
+ if (!file_new)
+ header = perf_header__read(output);
+ else
+ header = perf_header__new();
+
+
+ if (raw_samples) {
+ read_tracing_data(attrs, nr_counters);
+ } else {
+ for (i = 0; i < nr_counters; i++) {
+ if (attrs[i].sample_type & PERF_SAMPLE_RAW) {
+ read_tracing_data(attrs, nr_counters);
+ break;
+ }
+ }
+ }
+ atexit(atexit_header);
+
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);
+ pid = target_pid;
+ if (pid == -1)
+ pid = getpid();
+
+ 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);
+ }
+ }
- atexit(sig_atexit);
- signal(SIGCHLD, sig_handler);
- signal(SIGINT, sig_handler);
+ if (file_new)
+ perf_header__write(header, output);
+
+ if (!system_wide) {
+ pid_t tgid = pid_synthesize_comm_event(pid, 0);
+ pid_synthesize_mmap_samples(pid, tgid);
+ } else
+ synthesize_all();
if (target_pid == -1 && argc) {
pid = fork();
}
}
- if (system_wide)
- synthesize_samples();
-
- while (!done) {
+ for (;;) {
int hits = samples;
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++) {
+ if (mmap_array[i][counter].base)
+ mmap_read(&mmap_array[i][counter]);
+ }
+ }
+
+ if (hits == samples) {
+ if (done)
+ break;
+ ret = poll(event_array, nr_poll, -1);
+ waking++;
}
- if (hits == samples)
- ret = poll(event_array, nr_poll, 100);
+ if (done) {
+ for (i = 0; i < nr_cpu; i++) {
+ for (counter = 0; counter < nr_counters; counter++)
+ ioctl(fd[i][counter], PERF_COUNTER_IOC_DISABLE);
+ }
+ }
}
+ fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
+
/*
* Approximate RIP event size: 24 bytes.
*/
"record events on existing pid"),
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,
"append to the output file to do incremental profiling"),
+ 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,
"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,
"be more verbose (show counter open errors, etc)"),
+ OPT_BOOLEAN('s', "stat", &inherit_stat,
+ "per thread counts"),
+ OPT_BOOLEAN('d', "data", &sample_address,
+ "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)
+int cmd_record(int argc, const char **argv, const char *prefix __used)
{
int counter;
- argc = parse_options(argc, argv, options, record_usage, 0);
+ argc = parse_options(argc, argv, options, record_usage,
+ PARSE_OPT_STOP_AT_NON_OPTION);
if (!argc && target_pid == -1 && !system_wide)
usage_with_options(record_usage, options);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff