perf record: Allow specifying a pid to record
Allow specifying a pid instead of always fork+exec'ing a command. Because the PERF_EVENT_COMM and PERF_EVENT_MMAP events happened before we connected, we must synthesize them so that 'perf report' can get what it needs. [ Impact: add new command line option ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Clark Williams <williams@redhat.com> Cc: John Kacur <jkacur@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> LKML-Reference: <20090515015046.GA13664@ghostprotocols.net> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Arnaldo Carvalho de Melo
Ingo Molnar
parent
5bb9efe33e
commit
1a853e3687
@ -34,6 +34,9 @@
|
||||
|
||||
#include "perf.h"
|
||||
|
||||
#define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1)
|
||||
#define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask))
|
||||
|
||||
static int nr_counters = 0;
|
||||
static __u64 event_id[MAX_COUNTERS] = { };
|
||||
static int default_interval = 100000;
|
||||
@ -47,6 +50,7 @@ static char *output_name = "output.perf";
|
||||
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 nmi = 1;
|
||||
|
||||
@ -180,6 +184,7 @@ static void display_help(void)
|
||||
" -c CNT --count=CNT # event period to sample\n"
|
||||
" -m pages --mmap_pages=<pages> # number of mmap data pages\n"
|
||||
" -o file --output=<file> # output file\n"
|
||||
" -p pid --pid=<pid> # record events on existing pid\n"
|
||||
" -r prio --realtime=<prio> # use RT prio\n"
|
||||
" -s --system # system wide profiling\n"
|
||||
);
|
||||
@ -199,13 +204,14 @@ static void process_options(int argc, const char *argv[])
|
||||
{"event", required_argument, NULL, 'e'},
|
||||
{"mmap_pages", required_argument, NULL, 'm'},
|
||||
{"output", required_argument, NULL, 'o'},
|
||||
{"pid", required_argument, NULL, 'p'},
|
||||
{"realtime", required_argument, NULL, 'r'},
|
||||
{"system", no_argument, NULL, 's'},
|
||||
{"inherit", no_argument, NULL, 'i'},
|
||||
{"nmi", no_argument, NULL, 'n'},
|
||||
{NULL, 0, NULL, 0 }
|
||||
};
|
||||
int c = getopt_long(argc, argv, "+:c:e:m:o:r:sin",
|
||||
int c = getopt_long(argc, argv, "+:c:e:m:o:p:r:sin",
|
||||
long_options, &option_index);
|
||||
if (c == -1)
|
||||
break;
|
||||
@ -215,6 +221,7 @@ static void process_options(int argc, const char *argv[])
|
||||
case 'e': error = parse_events(optarg); break;
|
||||
case 'm': mmap_pages = atoi(optarg); break;
|
||||
case 'o': output_name = strdup(optarg); break;
|
||||
case 'p': target_pid = atoi(optarg); break;
|
||||
case 'r': realtime_prio = atoi(optarg); break;
|
||||
case 's': system_wide ^= 1; break;
|
||||
case 'i': inherit ^= 1; break;
|
||||
@ -223,7 +230,7 @@ static void process_options(int argc, const char *argv[])
|
||||
}
|
||||
}
|
||||
|
||||
if (argc - optind == 0)
|
||||
if (argc - optind == 0 && target_pid == -1)
|
||||
error = 1;
|
||||
|
||||
if (error)
|
||||
@ -350,15 +357,135 @@ static struct mmap_data mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
|
||||
static int nr_poll;
|
||||
static int nr_cpu;
|
||||
|
||||
static void open_counters(int cpu)
|
||||
struct mmap_event {
|
||||
struct perf_event_header header;
|
||||
__u32 pid, tid;
|
||||
__u64 start;
|
||||
__u64 len;
|
||||
__u64 pgoff;
|
||||
char filename[PATH_MAX];
|
||||
};
|
||||
struct comm_event {
|
||||
struct perf_event_header header;
|
||||
__u32 pid,tid;
|
||||
char comm[16];
|
||||
};
|
||||
|
||||
static pid_t pid_synthesize_comm_event(pid_t pid)
|
||||
{
|
||||
char filename[PATH_MAX];
|
||||
char bf[BUFSIZ];
|
||||
struct comm_event comm_ev;
|
||||
size_t size;
|
||||
int fd;
|
||||
|
||||
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);
|
||||
|
||||
pid_t spid, ppid;
|
||||
char state;
|
||||
char comm[18];
|
||||
|
||||
memset(&comm_ev, 0, sizeof(comm_ev));
|
||||
int nr = sscanf(bf, "%d %s %c %d %d ",
|
||||
&spid, comm, &state, &ppid, &comm_ev.pid);
|
||||
if (nr != 5) {
|
||||
fprintf(stderr, "couldn't get COMM and pgid, malformed %s\n",
|
||||
filename);
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
comm_ev.header.type = PERF_EVENT_COMM;
|
||||
comm_ev.tid = pid;
|
||||
size = strlen(comm);
|
||||
comm[--size] = '\0'; /* Remove the ')' at the end */
|
||||
--size; /* Remove the '(' at the begin */
|
||||
memcpy(comm_ev.comm, comm + 1, size);
|
||||
size = ALIGN(size, sizeof(uint64_t));
|
||||
comm_ev.header.size = sizeof(comm_ev) - (sizeof(comm_ev.comm) - size);
|
||||
int ret = write(output, &comm_ev, comm_ev.header.size);
|
||||
if (ret < 0) {
|
||||
perror("failed to write");
|
||||
exit(-1);
|
||||
}
|
||||
return comm_ev.pid;
|
||||
}
|
||||
|
||||
static void pid_synthesize_mmap_events(pid_t pid, pid_t pgid)
|
||||
{
|
||||
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];
|
||||
unsigned char vm_read, vm_write, vm_exec, vm_mayshare;
|
||||
struct mmap_event mmap_ev = {
|
||||
.header.type = PERF_EVENT_MMAP,
|
||||
};
|
||||
unsigned long ino;
|
||||
int major, minor;
|
||||
size_t size;
|
||||
if (fgets(bf, sizeof(bf), fp) == NULL)
|
||||
break;
|
||||
|
||||
/* 00400000-0040c000 r-xp 00000000 fd:01 41038 /bin/cat */
|
||||
sscanf(bf, "%llx-%llx %c%c%c%c %llx %x:%x %lu",
|
||||
&mmap_ev.start, &mmap_ev.len,
|
||||
&vm_read, &vm_write, &vm_exec, &vm_mayshare,
|
||||
&mmap_ev.pgoff, &major, &minor, &ino);
|
||||
if (vm_exec == 'x') {
|
||||
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 = pgid;
|
||||
mmap_ev.tid = pid;
|
||||
|
||||
if (write(output, &mmap_ev, mmap_ev.header.size) < 0) {
|
||||
perror("failed to write");
|
||||
exit(-1);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fclose(fp);
|
||||
}
|
||||
|
||||
static void open_counters(int cpu, pid_t pid)
|
||||
{
|
||||
struct perf_counter_hw_event hw_event;
|
||||
int counter, group_fd;
|
||||
int track = 1;
|
||||
pid_t pid = -1;
|
||||
|
||||
if (cpu < 0)
|
||||
pid = 0;
|
||||
if (pid > 0) {
|
||||
pid_t pgid = pid_synthesize_comm_event(pid);
|
||||
pid_synthesize_mmap_events(pid, pgid);
|
||||
}
|
||||
|
||||
group_fd = -1;
|
||||
for (counter = 0; counter < nr_counters; counter++) {
|
||||
@ -435,22 +562,24 @@ int cmd_record(int argc, const char **argv)
|
||||
argc -= optind;
|
||||
argv += optind;
|
||||
|
||||
if (!system_wide)
|
||||
open_counters(-1);
|
||||
else for (i = 0; i < nr_cpus; i++)
|
||||
open_counters(i);
|
||||
if (!system_wide) {
|
||||
open_counters(-1, target_pid != -1 ? target_pid : 0);
|
||||
} else for (i = 0; i < nr_cpus; i++)
|
||||
open_counters(i, target_pid);
|
||||
|
||||
signal(SIGCHLD, sig_handler);
|
||||
signal(SIGINT, sig_handler);
|
||||
|
||||
pid = fork();
|
||||
if (pid < 0)
|
||||
perror("failed to fork");
|
||||
if (target_pid == -1) {
|
||||
pid = fork();
|
||||
if (pid < 0)
|
||||
perror("failed to fork");
|
||||
|
||||
if (!pid) {
|
||||
if (execvp(argv[0], argv)) {
|
||||
perror(argv[0]);
|
||||
exit(-1);
|
||||
if (!pid) {
|
||||
if (execvp(argv[0], argv)) {
|
||||
perror(argv[0]);
|
||||
exit(-1);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user