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-rw-r--r--tools/perf/builtin-record.c347
1 files changed, 130 insertions, 217 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 3eeef339c787..0e519c667e3a 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -17,55 +17,52 @@
#include "util/header.h"
#include "util/event.h"
#include "util/debug.h"
-#include "util/trace-event.h"
+#include "util/symbol.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))
-
static int fd[MAX_NR_CPUS][MAX_COUNTERS];
-static long default_interval = 100000;
+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 int freq = 1000;
static int output;
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 pid_t child_pid = -1;
-static int inherit = 1;
-static int force = 0;
-static int append_file = 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 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 pid_t child_pid = -1;
+static int inherit = 1;
+static int force = 0;
+static int append_file = 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 = 0;
static struct timeval last_read;
static struct timeval this_read;
-static u64 bytes_written;
+static u64 bytes_written = 0;
static struct pollfd event_array[MAX_NR_CPUS * MAX_COUNTERS];
-static int nr_poll;
-static int nr_cpu;
+static int nr_poll = 0;
+static int nr_cpu = 0;
-static int file_new = 1;
+static int file_new = 1;
-struct perf_header *header;
+struct perf_header *header = NULL;
struct mmap_data {
int counter;
@@ -113,6 +110,24 @@ static void write_output(void *buf, size_t size)
}
}
+static void write_event(event_t *buf, size_t size)
+{
+ /*
+ * Add it to the list of DSOs, so that when we finish this
+ * record session we can pick the available build-ids.
+ */
+ if (buf->header.type == PERF_RECORD_MMAP)
+ dsos__findnew(buf->mmap.filename);
+
+ write_output(buf, size);
+}
+
+static int process_synthesized_event(event_t *event)
+{
+ write_event(event, event->header.size);
+ return 0;
+}
+
static void mmap_read(struct mmap_data *md)
{
unsigned int head = mmap_read_head(md);
@@ -161,14 +176,14 @@ static void mmap_read(struct mmap_data *md)
size = md->mask + 1 - (old & md->mask);
old += size;
- write_output(buf, size);
+ write_event(buf, size);
}
buf = &data[old & md->mask];
size = head - old;
old += size;
- write_output(buf, size);
+ write_event(buf, size);
md->prev = old;
mmap_write_tail(md, old);
@@ -195,168 +210,6 @@ static void sig_atexit(void)
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 (fp == 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_RECORD_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_RECORD_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_event_attr *a, int nr)
@@ -367,7 +220,11 @@ static struct perf_header_attr *get_header_attr(struct perf_event_attr *a, int n
h_attr = 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(header, h_attr) < 0) {
+ perf_header_attr__delete(h_attr);
+ h_attr = NULL;
+ }
}
return h_attr;
@@ -375,9 +232,11 @@ static struct perf_header_attr *get_header_attr(struct perf_event_attr *a, int n
static void create_counter(int counter, int cpu, pid_t pid)
{
+ 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 ret;
struct {
u64 count;
u64 time_enabled;
@@ -426,7 +285,7 @@ try_again:
if (fd[nr_cpu][counter] < 0) {
int err = errno;
- if (err == EPERM)
+ if (err == EPERM || err == EACCES)
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");
@@ -448,11 +307,19 @@ try_again:
printf("\n");
error("perfcounter syscall returned with %d (%s)\n",
fd[nr_cpu][counter], 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);
}
h_attr = get_header_attr(attr, counter);
+ if (h_attr == NULL)
+ die("nomem\n");
if (!file_new) {
if (memcmp(&h_attr->attr, attr, sizeof(*attr))) {
@@ -466,7 +333,10 @@ try_again:
exit(-1);
}
- perf_header_attr__add_id(h_attr, read_data.id);
+ if (perf_header_attr__add_id(h_attr, read_data.id) < 0) {
+ pr_warning("Not enough memory to add id\n");
+ exit(-1);
+ }
assert(fd[nr_cpu][counter] >= 0);
fcntl(fd[nr_cpu][counter], F_SETFL, O_NONBLOCK);
@@ -480,7 +350,6 @@ try_again:
multiplex_fd = fd[nr_cpu][counter];
if (multiplex && fd[nr_cpu][counter] != multiplex_fd) {
- int ret;
ret = ioctl(fd[nr_cpu][counter], PERF_EVENT_IOC_SET_OUTPUT, multiplex_fd);
assert(ret != -1);
@@ -500,6 +369,16 @@ try_again:
}
}
+ if (filter != NULL) {
+ ret = ioctl(fd[nr_cpu][counter],
+ PERF_EVENT_IOC_SET_FILTER, filter);
+ if (ret) {
+ error("failed to set filter with %d (%s)\n", errno,
+ strerror(errno));
+ exit(-1);
+ }
+ }
+
ioctl(fd[nr_cpu][counter], PERF_EVENT_IOC_ENABLE);
}
@@ -518,7 +397,7 @@ static void atexit_header(void)
{
header->data_size += bytes_written;
- perf_header__write(header, output);
+ perf_header__write(header, output, true);
}
static int __cmd_record(int argc, const char **argv)
@@ -527,7 +406,7 @@ 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;
page_size = sysconf(_SC_PAGE_SIZE);
@@ -561,22 +440,29 @@ static int __cmd_record(int argc, const char **argv)
exit(-1);
}
- if (!file_new)
- header = perf_header__read(output);
- else
- header = perf_header__new();
+ header = perf_header__new();
+ if (header == NULL) {
+ pr_err("Not enough memory for reading perf file header\n");
+ return -1;
+ }
+ if (!file_new) {
+ err = perf_header__read(header, output);
+ if (err < 0)
+ return err;
+ }
if (raw_samples) {
- read_tracing_data(attrs, nr_counters);
+ perf_header__set_feat(header, HEADER_TRACE_INFO);
} else {
for (i = 0; i < nr_counters; i++) {
if (attrs[i].sample_type & PERF_SAMPLE_RAW) {
- read_tracing_data(attrs, nr_counters);
+ perf_header__set_feat(header, HEADER_TRACE_INFO);
break;
}
}
}
+
atexit(atexit_header);
if (!system_wide) {
@@ -594,25 +480,36 @@ static int __cmd_record(int argc, const char **argv)
}
}
- if (file_new)
- perf_header__write(header, output);
+ if (file_new) {
+ err = perf_header__write(header, output, false);
+ if (err < 0)
+ return err;
+ }
- if (!system_wide) {
- pid_t tgid = pid_synthesize_comm_event(pid, 0);
- pid_synthesize_mmap_samples(pid, tgid);
- } else
- synthesize_all();
+ if (!system_wide)
+ event__synthesize_thread(pid, process_synthesized_event);
+ else
+ event__synthesize_threads(process_synthesized_event);
if (target_pid == -1 && argc) {
pid = fork();
if (pid < 0)
- perror("failed to fork");
+ die("failed to fork");
if (!pid) {
if (execvp(argv[0], (char **)argv)) {
perror(argv[0]);
exit(-1);
}
+ } else {
+ /*
+ * Wait a bit for the execv'ed child to appear
+ * and be updated in /proc
+ * FIXME: Do you know a less heuristical solution?
+ */
+ usleep(1000);
+ event__synthesize_thread(pid,
+ process_synthesized_event);
}
child_pid = pid;
@@ -623,7 +520,7 @@ static int __cmd_record(int argc, const char **argv)
param.sched_priority = realtime_prio;
if (sched_setscheduler(0, SCHED_FIFO, &param)) {
- printf("Could not set realtime priority.\n");
+ pr_err("Could not set realtime priority.\n");
exit(-1);
}
}
@@ -641,7 +538,7 @@ static int __cmd_record(int argc, const char **argv)
if (hits == samples) {
if (done)
break;
- ret = poll(event_array, nr_poll, -1);
+ err = poll(event_array, nr_poll, -1);
waking++;
}
@@ -677,6 +574,8 @@ 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"),
OPT_INTEGER('r', "realtime", &realtime_prio,
@@ -720,6 +619,8 @@ int cmd_record(int argc, const char **argv, const char *prefix __used)
{
int counter;
+ symbol__init(0);
+
argc = parse_options(argc, argv, options, record_usage,
PARSE_OPT_STOP_AT_NON_OPTION);
if (!argc && target_pid == -1 && !system_wide)
@@ -731,6 +632,18 @@ int cmd_record(int argc, const char **argv, const char *prefix __used)
attrs[0].config = PERF_COUNT_HW_CPU_CYCLES;
}
+ /*
+ * 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);
+ }
+
for (counter = 0; counter < nr_counters; counter++) {
if (attrs[counter].sample_period)
continue;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.