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SubjectRe: [PATCH] perf tools: Allow multiple threads or processes in record, stat, top


On 02/10/2012 12:24 PM, Arnaldo Carvalho de Melo wrote:
> Em Wed, Feb 08, 2012 at 09:32:52AM -0700, David Ahern escreveu:
>> 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
>
> I found some problems below:
>
>> 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
>> +static struct thread_map *thread_map__new_by_pid_str(const char *pid_str)
>> +{
>> + struct thread_map *threads = NULL;
> <SNIP>
>> + if (threads)
>> + threads = realloc(threads,
>> + sizeof(*threads) + sizeof(pid_t)*total_tasks);
>> + else
>> + threads = malloc(sizeof(*threads) + sizeof(pid_t)*items);
>
> If realloc fails and threads was allocated before... we leak memory.

ok.

>
> We don't need to use this if clause, realloc handles threads == NULL
> just fines and then works as malloc.

ok.

>
> Also I didn't use ctype altogether + that CSV parsing routine, we have
> strlist for that, it even will allow us to trow away duplicate pids/tids
> and also supports passing a file with a list of threads to monitor, for
> free.

Interesting. I did look at strlist before going with the string parsing.
It was not obvious to me how to use it for this case.

>
> Take a look at the modified patch below, if you're ok with it I can keep
> your autorship and put a [committer note: use strlist] or take autorship
> and state that it was based on a patch made by you, definetely your
> call. I'd go for the committer note.

I'm fine with either one. Patch below looks fine. If needed:

Acked-by: David Ahern <dsahern@gmail.com>

David


>
> - Arnaldo
>
> 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 d6d1c6c..08ed24b 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..5ed62a8 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"),
> @@ -1210,19 +1208,19 @@ 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,
> top.target_tid, top.uid, top.cpu_list) < 0)
> usage_with_options(top_usage, options);
> -
> +
> if (!top.evlist->nr_entries &&
> perf_evlist__add_default(top.evlist) < 0) {
> pr_err("Not enough memory for event selector list\n");
> 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/setup.py b/tools/perf/util/setup.py
> index 36d4c56..4f85b8f 100644
> --- a/tools/perf/util/setup.py
> +++ b/tools/perf/util/setup.py
> @@ -28,7 +28,8 @@ perf = Extension('perf',
> sources = ['util/python.c', 'util/ctype.c', 'util/evlist.c',
> 'util/evsel.c', 'util/cpumap.c', 'util/thread_map.c',
> 'util/util.c', 'util/xyarray.c', 'util/cgroup.c',
> - 'util/debugfs.c'],
> + 'util/debugfs.c', '../../lib/rbtree.c',
> + 'util/strlist.c'],
> include_dirs = ['util/include'],
> extra_compile_args = cflags,
> )
> diff --git a/tools/perf/util/thread_map.c b/tools/perf/util/thread_map.c
> index 3d4b6c5..884f7e2 100644
> --- a/tools/perf/util/thread_map.c
> +++ b/tools/perf/util/thread_map.c
> @@ -6,6 +6,8 @@
> #include <sys/types.h>
> #include <sys/stat.h>
> #include <unistd.h>
> +#include "strlist.h"
> +#include <string.h>
> #include "thread_map.h"
>
> /* Skip "." and ".." directories */
> @@ -152,6 +154,132 @@ struct thread_map *thread_map__new(pid_t pid, pid_t tid, uid_t uid)
> return thread_map__new_by_tid(tid);
> }
>
> +static struct thread_map *thread_map__new_by_pid_str(const char *pid_str)
> +{
> + struct thread_map *threads = NULL, *nt;
> + char name[256];
> + int items, total_tasks = 0;
> + struct dirent **namelist = NULL;
> + int i, j = 0;
> + pid_t pid, prev_pid = LONG_MAX;
> + char *end_ptr;
> + struct str_node *pos;
> + struct strlist *slist = strlist__new(false, pid_str);
> +
> + if (!slist)
> + return NULL;
> +
> + strlist__for_each(pos, slist) {
> + pid = strtol(pos->s, &end_ptr, 10);
> +
> + if (pid == LONG_MIN || pid == LONG_MAX ||
> + (*end_ptr != '\0' && *end_ptr != ','))
> + goto out_free_threads;
> +
> + if (pid == prev_pid)
> + continue;
> +
> + sprintf(name, "/proc/%d/task", pid);
> + items = scandir(name, &namelist, filter, NULL);
> + if (items <= 0)
> + break;
> +
> + total_tasks += items;
> + nt = realloc(threads, (sizeof(*threads) +
> + sizeof(pid_t) * total_tasks));
> + if (nt == NULL)
> + goto out_free_threads;
> +
> + threads = nt;
> +
> + 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;
> + }
> +
> +out:
> + strlist__delete(slist);
> + return threads;
> +
> +out_free_threads:
> + free(threads);
> + threads = NULL;
> + goto out;
> +}
> +
> +static struct thread_map *thread_map__new_by_tid_str(const char *tid_str)
> +{
> + struct thread_map *threads = NULL, *nt;
> + int ntasks = 0;
> + pid_t tid, prev_tid = LONG_MAX;
> + char *end_ptr;
> + struct str_node *pos;
> + struct strlist *slist;
> +
> + /* perf-stat expects threads to be generated even if tid not given */
> + if (!tid_str) {
> + threads = malloc(sizeof(*threads) + sizeof(pid_t));
> + if (threads != NULL) {
> + threads->map[1] = -1;
> + threads->nr = 1;
> + }
> + return threads;
> + }
> +
> + slist = strlist__new(false, tid_str);
> + if (!slist)
> + return NULL;
> +
> + strlist__for_each(pos, slist) {
> + tid = strtol(pos->s, &end_ptr, 10);
> +
> + if (tid == LONG_MIN || tid == LONG_MAX ||
> + (*end_ptr != '\0' && *end_ptr != ','))
> + goto out_free_threads;
> +
> + if (tid == prev_tid)
> + continue;
> +
> + ntasks++;
> + nt = realloc(threads, sizeof(*threads) + sizeof(pid_t) * ntasks);
> +
> + if (nt == NULL)
> + goto out_free_threads;
> +
> + threads = nt;
> + threads->map[ntasks - 1] = tid;
> + threads->nr = ntasks;
> + }
> +out:
> + return threads;
> +
> +out_free_threads:
> + free(threads);
> + threads = NULL;
> + goto out;
> +}
> +
> +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..52bb07c 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) {
> + /* UID 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)


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