perf evlist: Move the SIGUSR1 error reporting logic to prepare_workload

So that we have the boilerplate in the preparation method, instead of
open coded in tools wanting the reporting when the exec fails.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-purbdzcphdveskh7wwmnm4t7@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index f987d38..ea7c306 100644 (file)
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -390,7 +390,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
        if (forks) {
                err = perf_evlist__prepare_workload(evsel_list, &opts->target,
                                                    argv, file->is_pipe,
-                                                   true);
+                                                   workload_exec_failed_signal);
                if (err < 0) {
                        pr_err("Couldn't run the workload!\n");
                        goto out_delete_session;
@@ -507,20 +507,8 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
        /*
         * Let the child rip
         */
-       if (forks) {
-               struct sigaction act = {
-                       .sa_flags     = SA_SIGINFO,
-                       .sa_sigaction = workload_exec_failed_signal,
-               };
-               /*
-                * perf_evlist__prepare_workload will, after we call
-                * perf_evlist__start_Workload, send a SIGUSR1 if the exec call
-                * fails, that we will catch in workload_signal to flip
-                * workload_exec_errno.
-                */
-               sigaction(SIGUSR1, &act, NULL);
+       if (forks)
                perf_evlist__start_workload(evsel_list);
-       }
 
        for (;;) {
                int hits = rec->samples;

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 9d0d52d..f8456ca 100644 (file)
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -58,7 +58,6 @@
 #include "util/thread.h"
 #include "util/thread_map.h"
 
-#include <signal.h>
 #include <stdlib.h>
 #include <sys/prctl.h>
 #include <locale.h>
@@ -542,8 +541,8 @@ static int __run_perf_stat(int argc, const char **argv)
        }
 
        if (forks) {
-               if (perf_evlist__prepare_workload(evsel_list, &target, argv,
-                                                 false, true) < 0) {
+               if (perf_evlist__prepare_workload(evsel_list, &target, argv, false,
+                                                 workload_exec_failed_signal) < 0) {
                        perror("failed to prepare workload");
                        return -1;
                }
@@ -598,18 +597,6 @@ static int __run_perf_stat(int argc, const char **argv)
        clock_gettime(CLOCK_MONOTONIC, &ref_time);
 
        if (forks) {
-               struct sigaction act = {
-                       .sa_flags     = SA_SIGINFO,
-                       .sa_sigaction = workload_exec_failed_signal,
-               };
-               /*
-                * perf_evlist__prepare_workload will, after we call
-                * perf_evlist__start_Workload, send a SIGUSR1 if the exec call
-                * fails, that we will catch in workload_signal to flip
-                * workload_exec_errno.
-                */
-               sigaction(SIGUSR1, &act, NULL);
-
                perf_evlist__start_workload(evsel_list);
                handle_initial_delay();
 

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index c5b4bc5..5498eac 100644 (file)
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -1895,7 +1895,7 @@ static int trace__run(struct trace *trace, int argc, const char **argv)
 
        if (forks) {
                err = perf_evlist__prepare_workload(evlist, &trace->opts.target,
-                                                   argv, false, false);
+                                                   argv, false, NULL);
                if (err < 0) {
                        fprintf(trace->output, "Couldn't run the workload!\n");
                        goto out_delete_maps;

diff --git a/tools/perf/tests/perf-record.c b/tools/perf/tests/perf-record.c
index eeba562..fa0ed35 100644 (file)
--- a/tools/perf/tests/perf-record.c
+++ b/tools/perf/tests/perf-record.c
@@ -83,8 +83,7 @@ int test__PERF_RECORD(void)
         * so that we have time to open the evlist (calling sys_perf_event_open
         * on all the fds) and then mmap them.
         */
-       err = perf_evlist__prepare_workload(evlist, &opts.target, argv,
-                                           false, false);
+       err = perf_evlist__prepare_workload(evlist, &opts.target, argv, false, NULL);
        if (err < 0) {
                pr_debug("Couldn't run the workload!\n");
                goto out_delete_maps;

diff --git a/tools/perf/tests/task-exit.c b/tools/perf/tests/task-exit.c
index d09ab57..44e339d 100644 (file)
--- a/tools/perf/tests/task-exit.c
+++ b/tools/perf/tests/task-exit.c
@@ -9,12 +9,21 @@
 static int exited;
 static int nr_exit;
 
-static void sig_handler(int sig)
+static void sig_handler(int sig __maybe_unused)
 {
        exited = 1;
+}
 
-       if (sig == SIGUSR1)
-               nr_exit = -1;
+/*
+ * perf_evlist__prepare_workload will send a SIGUSR1 if the fork fails, since
+ * we asked by setting its exec_error to this handler.
+ */
+static void workload_exec_failed_signal(int signo __maybe_unused,
+                                       siginfo_t *info __maybe_unused,
+                                       void *ucontext __maybe_unused)
+{
+       exited  = 1;
+       nr_exit = -1;
 }
 
 /*
@@ -35,7 +44,6 @@ int test__task_exit(void)
        const char *argv[] = { "true", NULL };
 
        signal(SIGCHLD, sig_handler);
-       signal(SIGUSR1, sig_handler);
 
        evlist = perf_evlist__new_default();
        if (evlist == NULL) {
@@ -57,7 +65,8 @@ int test__task_exit(void)
                goto out_delete_maps;
        }
 
-       err = perf_evlist__prepare_workload(evlist, &target, argv, false, true);
+       err = perf_evlist__prepare_workload(evlist, &target, argv, false,
+                                           workload_exec_failed_signal);
        if (err < 0) {
                pr_debug("Couldn't run the workload!\n");
                goto out_delete_maps;

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 4a30c87..96b3ef5 100644 (file)
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -1029,7 +1029,7 @@ out_err:
 
 int perf_evlist__prepare_workload(struct perf_evlist *evlist, struct target *target,
                                  const char *argv[], bool pipe_output,
-                                 bool want_signal)
+                                 void (*exec_error)(int signo, siginfo_t *info, void *ucontext))
 {
        int child_ready_pipe[2], go_pipe[2];
        char bf;
@@ -1073,7 +1073,7 @@ int perf_evlist__prepare_workload(struct perf_evlist *evlist, struct target *tar
 
                execvp(argv[0], (char **)argv);
 
-               if (want_signal) {
+               if (exec_error) {
                        union sigval val;
 
                        val.sival_int = errno;
@@ -1084,6 +1084,14 @@ int perf_evlist__prepare_workload(struct perf_evlist *evlist, struct target *tar
                exit(-1);
        }
 
+       if (exec_error) {
+               struct sigaction act = {
+                       .sa_flags     = SA_SIGINFO,
+                       .sa_sigaction = exec_error,
+               };
+               sigaction(SIGUSR1, &act, NULL);
+       }
+
        if (target__none(target))
                evlist->threads->map[0] = evlist->workload.pid;
 

diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index 2fe5195..18d1222 100644 (file)
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -103,7 +103,8 @@ int record_opts__config(struct record_opts *opts);
 int perf_evlist__prepare_workload(struct perf_evlist *evlist,
                                  struct target *target,
                                  const char *argv[], bool pipe_output,
-                                 bool want_signal);
+                                 void (*exec_error)(int signo, siginfo_t *info,
+                                                    void *ucontext));
 int perf_evlist__start_workload(struct perf_evlist *evlist);
 
 int perf_evlist__parse_mmap_pages(const struct option *opt,