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Subject[PATCH] perf tools: Allow multiple threads or processes in record, stat, top
Date
Allow a user to collect events for multiple threads or processes
using a comma separated list.

e.g., collect data on a VM and its vhost thread:
perf top -p 21483,21485
perf stat -p 21483,21485 -ddd
perf record -p 21483,21485

or monitoring vcpu threads
perf top -t 21488,21489
perf stat -t 21488,21489 -ddd
perf record -t 21488,21489

Signed-off-by: David Ahern <dsahern@gmail.com>
---
tools/perf/Documentation/perf-record.txt | 4 +-
tools/perf/Documentation/perf-stat.txt | 4 +-
tools/perf/Documentation/perf-top.txt | 4 +-
tools/perf/builtin-record.c | 10 +-
tools/perf/builtin-stat.c | 31 +++---
tools/perf/builtin-test.c | 2 -
tools/perf/builtin-top.c | 12 +--
tools/perf/perf.h | 4 +-
tools/perf/util/evlist.c | 10 +-
tools/perf/util/evlist.h | 4 +-
tools/perf/util/evsel.c | 2 +-
tools/perf/util/thread_map.c | 152 ++++++++++++++++++++++++++++++
tools/perf/util/thread_map.h | 4 +
tools/perf/util/top.c | 10 +-
tools/perf/util/top.h | 2 +-
tools/perf/util/usage.c | 6 +-
tools/perf/util/util.h | 2 +-
17 files changed, 207 insertions(+), 56 deletions(-)
diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index ff9a66e..a5766b4 100644
--- a/tools/perf/Documentation/perf-record.txt
+++ b/tools/perf/Documentation/perf-record.txt
@@ -52,11 +52,11 @@ OPTIONS

-p::
--pid=::
- Record events on existing process ID.
+ Record events on existing process ID (comma separated list).

-t::
--tid=::
- Record events on existing thread ID.
+ Record events on existing thread ID (comma separated list).

-u::
--uid=::
diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt
index 8966b9a..2fa173b 100644
--- a/tools/perf/Documentation/perf-stat.txt
+++ b/tools/perf/Documentation/perf-stat.txt
@@ -35,11 +35,11 @@ OPTIONS
child tasks do not inherit counters
-p::
--pid=<pid>::
- stat events on existing process id
+ stat events on existing process id (comma separated list)

-t::
--tid=<tid>::
- stat events on existing thread id
+ stat events on existing thread id (comma separated list)


-a::
diff --git a/tools/perf/Documentation/perf-top.txt b/tools/perf/Documentation/perf-top.txt
index ab1454e..4a5680c 100644
--- a/tools/perf/Documentation/perf-top.txt
+++ b/tools/perf/Documentation/perf-top.txt
@@ -72,11 +72,11 @@ Default is to monitor all CPUS.

-p <pid>::
--pid=<pid>::
- Profile events on existing Process ID.
+ Profile events on existing Process ID (comma separated list).

-t <tid>::
--tid=<tid>::
- Profile events on existing thread ID.
+ Profile events on existing thread ID (comma separated list).

-u::
--uid=::
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index f8d9a54..3291c34 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -645,8 +645,6 @@ static const char * const record_usage[] = {
*/
static struct perf_record record = {
.opts = {
- .target_pid = -1,
- .target_tid = -1,
.mmap_pages = UINT_MAX,
.user_freq = UINT_MAX,
.user_interval = ULLONG_MAX,
@@ -670,9 +668,9 @@ const struct option record_options[] = {
parse_events_option),
OPT_CALLBACK(0, "filter", &record.evlist, "filter",
"event filter", parse_filter),
- OPT_INTEGER('p', "pid", &record.opts.target_pid,
+ OPT_STRING('p', "pid", &record.opts.target_pid, "pid",
"record events on existing process id"),
- OPT_INTEGER('t', "tid", &record.opts.target_tid,
+ OPT_STRING('t', "tid", &record.opts.target_tid, "tid",
"record events on existing thread id"),
OPT_INTEGER('r', "realtime", &record.realtime_prio,
"collect data with this RT SCHED_FIFO priority"),
@@ -739,7 +737,7 @@ int cmd_record(int argc, const char **argv, const char *prefix __used)

argc = parse_options(argc, argv, record_options, record_usage,
PARSE_OPT_STOP_AT_NON_OPTION);
- if (!argc && rec->opts.target_pid == -1 && rec->opts.target_tid == -1 &&
+ if (!argc && !rec->opts.target_pid && !rec->opts.target_tid &&
!rec->opts.system_wide && !rec->opts.cpu_list && !rec->uid_str)
usage_with_options(record_usage, record_options);

@@ -785,7 +783,7 @@ int cmd_record(int argc, const char **argv, const char *prefix __used)
if (rec->uid_str != NULL && rec->opts.uid == UINT_MAX - 1)
goto out_free_fd;

- if (rec->opts.target_pid != -1)
+ if (rec->opts.target_pid)
rec->opts.target_tid = rec->opts.target_pid;

if (perf_evlist__create_maps(evsel_list, rec->opts.target_pid,
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index d14b37a..ea40e4e 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -182,8 +182,8 @@ static int run_count = 1;
static bool no_inherit = false;
static bool scale = true;
static bool no_aggr = false;
-static pid_t target_pid = -1;
-static pid_t target_tid = -1;
+static const char *target_pid;
+static const char *target_tid;
static pid_t child_pid = -1;
static bool null_run = false;
static int detailed_run = 0;
@@ -296,7 +296,7 @@ static int create_perf_stat_counter(struct perf_evsel *evsel,
if (system_wide)
return perf_evsel__open_per_cpu(evsel, evsel_list->cpus,
group, group_fd);
- if (target_pid == -1 && target_tid == -1) {
+ if (!target_pid && !target_tid) {
attr->disabled = 1;
attr->enable_on_exec = 1;
}
@@ -446,7 +446,7 @@ static int run_perf_stat(int argc __used, const char **argv)
exit(-1);
}

- if (target_tid == -1 && target_pid == -1 && !system_wide)
+ if (!target_tid && !target_pid && !system_wide)
evsel_list->threads->map[0] = child_pid;

/*
@@ -968,14 +968,14 @@ static void print_stat(int argc, const char **argv)
if (!csv_output) {
fprintf(output, "\n");
fprintf(output, " Performance counter stats for ");
- if(target_pid == -1 && target_tid == -1) {
+ if (!target_pid && !target_tid) {
fprintf(output, "\'%s", argv[0]);
for (i = 1; i < argc; i++)
fprintf(output, " %s", argv[i]);
- } else if (target_pid != -1)
- fprintf(output, "process id \'%d", target_pid);
+ } else if (target_pid)
+ fprintf(output, "process id \'%s", target_pid);
else
- fprintf(output, "thread id \'%d", target_tid);
+ fprintf(output, "thread id \'%s", target_tid);

fprintf(output, "\'");
if (run_count > 1)
@@ -1049,10 +1049,10 @@ static const struct option options[] = {
"event filter", parse_filter),
OPT_BOOLEAN('i', "no-inherit", &no_inherit,
"child tasks do not inherit counters"),
- OPT_INTEGER('p', "pid", &target_pid,
- "stat events on existing process id"),
- OPT_INTEGER('t', "tid", &target_tid,
- "stat events on existing thread id"),
+ OPT_STRING('p', "pid", &target_pid, "pid",
+ "stat events on existing process id"),
+ OPT_STRING('t', "tid", &target_tid, "tid",
+ "stat events on existing thread id"),
OPT_BOOLEAN('a', "all-cpus", &system_wide,
"system-wide collection from all CPUs"),
OPT_BOOLEAN('g', "group", &group,
@@ -1190,7 +1190,7 @@ int cmd_stat(int argc, const char **argv, const char *prefix __used)
} else if (big_num_opt == 0) /* User passed --no-big-num */
big_num = false;

- if (!argc && target_pid == -1 && target_tid == -1)
+ if (!argc && !target_pid && !target_tid)
usage_with_options(stat_usage, options);
if (run_count <= 0)
usage_with_options(stat_usage, options);
@@ -1206,10 +1206,11 @@ int cmd_stat(int argc, const char **argv, const char *prefix __used)
if (add_default_attributes())
goto out;

- if (target_pid != -1)
+ if (target_pid)
target_tid = target_pid;

- evsel_list->threads = thread_map__new(target_pid, target_tid, UINT_MAX);
+ evsel_list->threads = thread_map__new_str(target_pid,
+ target_tid, UINT_MAX);
if (evsel_list->threads == NULL) {
pr_err("Problems finding threads of monitor\n");
usage_with_options(stat_usage, options);
diff --git a/tools/perf/builtin-test.c b/tools/perf/builtin-test.c
index 70c4eb2..0f15195 100644
--- a/tools/perf/builtin-test.c
+++ b/tools/perf/builtin-test.c
@@ -1010,8 +1010,6 @@ realloc:
static int test__PERF_RECORD(void)
{
struct perf_record_opts opts = {
- .target_pid = -1,
- .target_tid = -1,
.no_delay = true,
.freq = 10,
.mmap_pages = 256,
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index d869b21..94d55cb 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -965,7 +965,7 @@ static int __cmd_top(struct perf_top *top)
if (ret)
goto out_delete;

- if (top->target_tid != -1 || top->uid != UINT_MAX)
+ if (top->target_tid || top->uid != UINT_MAX)
perf_event__synthesize_thread_map(&top->tool, top->evlist->threads,
perf_event__process,
&top->session->host_machine);
@@ -1103,8 +1103,6 @@ int cmd_top(int argc, const char **argv, const char *prefix __used)
struct perf_top top = {
.count_filter = 5,
.delay_secs = 2,
- .target_pid = -1,
- .target_tid = -1,
.uid = UINT_MAX,
.freq = 1000, /* 1 KHz */
.sample_id_all_avail = true,
@@ -1118,9 +1116,9 @@ int cmd_top(int argc, const char **argv, const char *prefix __used)
parse_events_option),
OPT_INTEGER('c', "count", &top.default_interval,
"event period to sample"),
- OPT_INTEGER('p', "pid", &top.target_pid,
+ OPT_STRING('p', "pid", &top.target_pid, "pid",
"profile events on existing process id"),
- OPT_INTEGER('t', "tid", &top.target_tid,
+ OPT_STRING('t', "tid", &top.target_tid, "tid",
"profile events on existing thread id"),
OPT_BOOLEAN('a', "all-cpus", &top.system_wide,
"system-wide collection from all CPUs"),
@@ -1210,13 +1208,13 @@ int cmd_top(int argc, const char **argv, const char *prefix __used)
goto out_delete_evlist;

/* CPU and PID are mutually exclusive */
- if (top.target_tid > 0 && top.cpu_list) {
+ if (top.target_tid && top.cpu_list) {
printf("WARNING: PID switch overriding CPU\n");
sleep(1);
top.cpu_list = NULL;
}

- if (top.target_pid != -1)
+ if (top.target_pid)
top.target_tid = top.target_pid;

if (perf_evlist__create_maps(top.evlist, top.target_pid,
diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index 92af168..deb17db 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -186,8 +186,8 @@ extern const char perf_version_string[];
void pthread__unblock_sigwinch(void);

struct perf_record_opts {
- pid_t target_pid;
- pid_t target_tid;
+ const char *target_pid;
+ const char *target_tid;
uid_t uid;
bool call_graph;
bool group;
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index a57a8cf..5c61dc5 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -593,15 +593,15 @@ int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
return perf_evlist__mmap_per_cpu(evlist, prot, mask);
}

-int perf_evlist__create_maps(struct perf_evlist *evlist, pid_t target_pid,
- pid_t target_tid, uid_t uid, const char *cpu_list)
+int perf_evlist__create_maps(struct perf_evlist *evlist, const char *target_pid,
+ const char *target_tid, uid_t uid, const char *cpu_list)
{
- evlist->threads = thread_map__new(target_pid, target_tid, uid);
+ evlist->threads = thread_map__new_str(target_pid, target_tid, uid);

if (evlist->threads == NULL)
return -1;

- if (uid != UINT_MAX || (cpu_list == NULL && target_tid != -1))
+ if (uid != UINT_MAX || (cpu_list == NULL && target_tid))
evlist->cpus = cpu_map__dummy_new();
else
evlist->cpus = cpu_map__new(cpu_list);
@@ -820,7 +820,7 @@ int perf_evlist__prepare_workload(struct perf_evlist *evlist,
exit(-1);
}

- if (!opts->system_wide && opts->target_tid == -1 && opts->target_pid == -1)
+ if (!opts->system_wide && !opts->target_tid && !opts->target_pid)
evlist->threads->map[0] = evlist->workload.pid;

close(child_ready_pipe[1]);
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index 1b4282b..21f1c9e 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -106,8 +106,8 @@ static inline void perf_evlist__set_maps(struct perf_evlist *evlist,
evlist->threads = threads;
}

-int perf_evlist__create_maps(struct perf_evlist *evlist, pid_t target_pid,
- pid_t tid, uid_t uid, const char *cpu_list);
+int perf_evlist__create_maps(struct perf_evlist *evlist, const char *target_pid,
+ const char *tid, uid_t uid, const char *cpu_list);
void perf_evlist__delete_maps(struct perf_evlist *evlist);
int perf_evlist__set_filters(struct perf_evlist *evlist);

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 9a11f9e..f910f50 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -130,7 +130,7 @@ void perf_evsel__config(struct perf_evsel *evsel, struct perf_record_opts *opts)
attr->mmap = track;
attr->comm = track;

- if (opts->target_pid == -1 && opts->target_tid == -1 && !opts->system_wide) {
+ if (!opts->target_pid && !opts->target_tid && !opts->system_wide) {
attr->disabled = 1;
attr->enable_on_exec = 1;
}
diff --git a/tools/perf/util/thread_map.c b/tools/perf/util/thread_map.c
index 3d4b6c5..e793c16 100644
--- a/tools/perf/util/thread_map.c
+++ b/tools/perf/util/thread_map.c
@@ -6,7 +6,10 @@
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
+#include <ctype.h>
+#include <string.h>
#include "thread_map.h"
+#include "debug.h"

/* Skip "." and ".." directories */
static int filter(const struct dirent *dir)
@@ -152,6 +155,155 @@ struct thread_map *thread_map__new(pid_t pid, pid_t tid, uid_t uid)
return thread_map__new_by_tid(tid);
}

+
+static pid_t get_next_task_id(char **str)
+{
+ char *p, *pend;
+ pid_t ret = -1;
+ bool adv_pend = false;
+
+ pend = p = *str;
+
+ /* empty strings */
+ if (*pend == '\0')
+ return -1;
+
+ /* only expecting digits separated by commas */
+ while (isdigit(*pend))
+ ++pend;
+
+ if (*pend == ',') {
+ *pend = '\0';
+ adv_pend = true;
+ /* catch strings ending in a comma - like '1234,' */
+ if (*(pend+1) == '\0') {
+ ui__error("task id strings should not end in a comma\n");
+ goto out;
+ }
+ }
+
+ /* only convert if all characters are valid */
+ if (*pend == '\0') {
+ ret = atoi(p);
+ if (adv_pend)
+ pend++;
+ *str = pend;
+ }
+
+out:
+ return ret;
+}
+
+static struct thread_map *thread_map__new_by_pid_str(const char *pid_str)
+{
+ struct thread_map *threads = NULL;
+ char name[256];
+ int items, total_tasks = 0;
+ struct dirent **namelist = NULL;
+ int i, j = 0;
+ char *ostr, *str;
+ pid_t pid;
+
+ ostr = strdup(pid_str);
+ if (!ostr)
+ return NULL;
+ str = ostr;
+
+ while (*str) {
+ pid = get_next_task_id(&str);
+ if (pid < 0) {
+ free(threads);
+ threads = NULL;
+ break;
+ }
+
+ sprintf(name, "/proc/%d/task", pid);
+ items = scandir(name, &namelist, filter, NULL);
+ if (items <= 0)
+ break;
+
+ total_tasks += items;
+ if (threads)
+ threads = realloc(threads,
+ sizeof(*threads) + sizeof(pid_t)*total_tasks);
+ else
+ threads = malloc(sizeof(*threads) + sizeof(pid_t)*items);
+
+ if (threads) {
+ for (i = 0; i < items; i++)
+ threads->map[j++] = atoi(namelist[i]->d_name);
+ threads->nr = total_tasks;
+ }
+
+ for (i = 0; i < items; i++)
+ free(namelist[i]);
+ free(namelist);
+
+ if (!threads)
+ break;
+ }
+
+ free(ostr);
+
+ return threads;
+}
+
+static struct thread_map *thread_map__new_by_tid_str(const char *tid_str)
+{
+ struct thread_map *threads = NULL;
+ char *str;
+ int ntasks = 0;
+ pid_t tid;
+
+ /* perf-stat expects threads to be generated even if tid not given */
+ if (!tid_str) {
+ threads = malloc(sizeof(*threads) + sizeof(pid_t));
+ threads->map[1] = -1;
+ threads->nr = 1;
+ return threads;
+ }
+
+ str = strdup(tid_str);
+ if (!str)
+ return NULL;
+
+ while (*str) {
+ tid = get_next_task_id(&str);
+ if (tid < 0) {
+ free(threads);
+ threads = NULL;
+ break;
+ }
+
+ ntasks++;
+ if (threads)
+ threads = realloc(threads,
+ sizeof(*threads) + sizeof(pid_t) * ntasks);
+ else
+ threads = malloc(sizeof(*threads) + sizeof(pid_t));
+
+ if (threads == NULL)
+ break;
+
+ threads->map[ntasks-1] = tid;
+ threads->nr = ntasks;
+ }
+
+ return threads;
+}
+
+struct thread_map *thread_map__new_str(const char *pid, const char *tid,
+ uid_t uid)
+{
+ if (pid)
+ return thread_map__new_by_pid_str(pid);
+
+ if (!tid && uid != UINT_MAX)
+ return thread_map__new_by_uid(uid);
+
+ return thread_map__new_by_tid_str(tid);
+}
+
void thread_map__delete(struct thread_map *threads)
{
free(threads);
diff --git a/tools/perf/util/thread_map.h b/tools/perf/util/thread_map.h
index c75ddba..7da80f1 100644
--- a/tools/perf/util/thread_map.h
+++ b/tools/perf/util/thread_map.h
@@ -13,6 +13,10 @@ struct thread_map *thread_map__new_by_pid(pid_t pid);
struct thread_map *thread_map__new_by_tid(pid_t tid);
struct thread_map *thread_map__new_by_uid(uid_t uid);
struct thread_map *thread_map__new(pid_t pid, pid_t tid, uid_t uid);
+
+struct thread_map *thread_map__new_str(const char *pid,
+ const char *tid, uid_t uid);
+
void thread_map__delete(struct thread_map *threads);

size_t thread_map__fprintf(struct thread_map *threads, FILE *fp);
diff --git a/tools/perf/util/top.c b/tools/perf/util/top.c
index e4370ca..09fe579 100644
--- a/tools/perf/util/top.c
+++ b/tools/perf/util/top.c
@@ -69,11 +69,11 @@ size_t perf_top__header_snprintf(struct perf_top *top, char *bf, size_t size)

ret += SNPRINTF(bf + ret, size - ret, "], ");

- if (top->target_pid != -1)
- ret += SNPRINTF(bf + ret, size - ret, " (target_pid: %d",
+ if (top->target_pid)
+ ret += SNPRINTF(bf + ret, size - ret, " (target_pid: %s",
top->target_pid);
- else if (top->target_tid != -1)
- ret += SNPRINTF(bf + ret, size - ret, " (target_tid: %d",
+ else if (top->target_tid)
+ ret += SNPRINTF(bf + ret, size - ret, " (target_tid: %s",
top->target_tid);
else if (top->uid_str != NULL)
ret += SNPRINTF(bf + ret, size - ret, " (uid: %s",
@@ -85,7 +85,7 @@ size_t perf_top__header_snprintf(struct perf_top *top, char *bf, size_t size)
ret += SNPRINTF(bf + ret, size - ret, ", CPU%s: %s)",
top->evlist->cpus->nr > 1 ? "s" : "", top->cpu_list);
else {
- if (top->target_tid != -1)
+ if (top->target_tid)
ret += SNPRINTF(bf + ret, size - ret, ")");
else
ret += SNPRINTF(bf + ret, size - ret, ", %d CPU%s)",
diff --git a/tools/perf/util/top.h b/tools/perf/util/top.h
index def3e53..49eb848 100644
--- a/tools/perf/util/top.h
+++ b/tools/perf/util/top.h
@@ -23,7 +23,7 @@ struct perf_top {
u64 guest_us_samples, guest_kernel_samples;
int print_entries, count_filter, delay_secs;
int freq;
- pid_t target_pid, target_tid;
+ const char *target_pid, *target_tid;
uid_t uid;
bool hide_kernel_symbols, hide_user_symbols, zero;
bool system_wide;
diff --git a/tools/perf/util/usage.c b/tools/perf/util/usage.c
index d0c0139..1240bd6 100644
--- a/tools/perf/util/usage.c
+++ b/tools/perf/util/usage.c
@@ -83,7 +83,7 @@ void warning(const char *warn, ...)
va_end(params);
}

-uid_t parse_target_uid(const char *str, pid_t tid, pid_t pid)
+uid_t parse_target_uid(const char *str, const char *tid, const char *pid)
{
struct passwd pwd, *result;
char buf[1024];
@@ -91,8 +91,8 @@ uid_t parse_target_uid(const char *str, pid_t tid, pid_t pid)
if (str == NULL)
return UINT_MAX;

- /* CPU and PID are mutually exclusive */
- if (tid > 0 || pid > 0) {
+ /* UUID and PID are mutually exclusive */
+ if (tid || pid) {
ui__warning("PID/TID switch overriding UID\n");
sleep(1);
return UINT_MAX;
diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
index 232d17e..7917b09 100644
--- a/tools/perf/util/util.h
+++ b/tools/perf/util/util.h
@@ -245,7 +245,7 @@ struct perf_event_attr;

void event_attr_init(struct perf_event_attr *attr);

-uid_t parse_target_uid(const char *str, pid_t tid, pid_t pid);
+uid_t parse_target_uid(const char *str, const char *tid, const char *pid);

#define _STR(x) #x
#define STR(x) _STR(x)
--
1.7.7.6


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