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perf record: Fix .tid and .pid fill-in when synthesizing events 

Noticed when trying to record events for a firefox thread. We
were synthesizing both .tid and .pid with the pid passed via
--pid.

Fix it by reading /proc/PID/status and getting the tgid
to use in .pid, .tid gets the specified "pid".

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mike Galbraith <efault@gmx.de>
LKML-Reference: <20090811192200.GF18061@ghostprotocols.net>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Arnaldo Carvalho de Melo 2009-08-11 16:22:00 -03:00 committed by Ingo Molnar
parent f64ccccb8a
commit 2a8083f063
1 changed files with 37 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

69
tools/perf/builtin-record.c
View File

@ -203,46 +203,48 @@ static void sig_atexit(void)
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;
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) {
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;
return 0;
}
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++);
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.pid = pid;
comm_ev.header.type = PERF_EVENT_COMM;
size = ALIGN(size, sizeof(u64));
comm_ev.header.size = sizeof(comm_ev) - (sizeof(comm_ev.comm) - size);
@ -251,7 +253,7 @@ static void pid_synthesize_comm_event(pid_t pid, int full)
comm_ev.tid = pid;
write_output(&comm_ev, comm_ev.header.size);
return;
goto out_fclose;
}
snprintf(filename, sizeof(filename), "/proc/%d/task", pid);
@ -268,7 +270,10 @@ static void pid_synthesize_comm_event(pid_t pid, int full)
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",
@ -276,7 +281,7 @@ out_failure:
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;
@ -328,7 +333,7 @@ static void pid_synthesize_mmap_samples(pid_t pid)
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;
write_output(&mmap_ev, mmap_ev.header.size);
@ -347,14 +352,14 @@ static void synthesize_all(void)
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);
@ -567,8 +572,8 @@ static int __cmd_record(int argc, const char **argv)
perf_header__write(header, output);
if (!system_wide) {
pid_synthesize_comm_event(pid, 0);
pid_synthesize_mmap_samples(pid);
pid_t tgid = pid_synthesize_comm_event(pid, 0);
pid_synthesize_mmap_samples(pid, tgid);
} else
synthesize_all();