perf tools: Add -q/--quiet option

index 0a88670e56f3..f03a5eac2a62 100644
@@ -394,8 +394,7 @@ static int perf_evlist__tty_browse_hists(struct perf_evlist *evlist,
 		fprintf(stdout, "\n\n");
 	}
 
-	if (sort_order == NULL &&
-	    parent_pattern == default_parent_pattern)
+	if (!quiet)
 		fprintf(stdout, "#\n# (%s)\n#\n", help);
 
 	if (rep->show_threads) {

index 30e2b2cb2421..ff437a678976 100644
@@ -311,6 +311,7 @@ int cmd_buildid_cache(int argc, const char **argv,
 	OPT_STRING('u', "update", &update_name_list_str, "file list",
 		    "file(s) to update"),
 	OPT_INCR('v', "verbose", &verbose, "be more verbose"),
+	OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any message"),
 	OPT_END()
 	};
 	const char * const buildid_cache_usage[] = {

@@ -326,6 +327,9 @@ int cmd_buildid_cache(int argc, const char **argv,
 		     !missing_filename && !update_name_list_str))
 		usage_with_options(buildid_cache_usage, buildid_cache_options);
 
+	if (quiet)
+		perf_quiet_option();
+
 	if (missing_filename) {
 		file.path = missing_filename;
 		file.force = force;

index 5e914ee79eb3..6fc2a2fe6627 100644
@@ -99,6 +99,7 @@ int cmd_buildid_list(int argc, const char **argv,
 	OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
 	OPT_BOOLEAN('k', "kernel", &show_kernel, "Show current kernel build id"),
 	OPT_INCR('v', "verbose", &verbose, "be more verbose"),
+	OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any message"),
 	OPT_END()
 	};
 	const char * const buildid_list_usage[] = {

@@ -109,6 +110,9 @@ int cmd_buildid_list(int argc, const char **argv,
 	argc = parse_options(argc, argv, options, buildid_list_usage, 0);
 	setup_pager();
 
+	if (quiet)
+		perf_quiet_option();
+
 	if (show_kernel)
 		return !(sysfs__fprintf_build_id(stdout) > 0);
 

index e2b21723bbf8..3fac30ed92f1 100644
@@ -2536,7 +2536,7 @@ static int perf_c2c__report(int argc, const char **argv)
 	OPT_BOOLEAN(0, "stdio", &c2c.use_stdio, "Use the stdio interface"),
 #endif
 	OPT_BOOLEAN(0, "stats", &c2c.stats_only,
-		    "Use the stdio interface"),
+		    "Display only statistic tables (implies --stdio)"),
 	OPT_BOOLEAN(0, "full-symbols", &c2c.symbol_full,
 		    "Display full length of symbols"),
 	OPT_BOOLEAN(0, "no-source", &no_source,

index 3fac30ed92f1..5cd6d7a047b9 100644
@@ -2334,7 +2334,7 @@ static int perf_c2c__hists_browse(struct hists *hists)
 
 static void perf_c2c_display(struct perf_session *session)
 {
-	if (c2c.use_stdio)
+	if (use_browser == 0)
 		perf_c2c__hists_fprintf(stdout, session);
 	else
 		perf_c2c__hists_browse(&c2c.hists.hists);

index 5cd6d7a047b9..211f9f29620c 100644
@@ -103,6 +103,7 @@ static const char *display_str[DISPLAY_MAX] = {
 
 static const struct option c2c_options[] = {
 	OPT_INCR('v', "verbose", &verbose, "be more verbose (show counter open errors, etc)"),
+	OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any message"),
 	OPT_END()
 };
 

@@ -184,7 +185,7 @@ he__get_c2c_hists(struct hist_entry *he,
 static void c2c_he__set_cpu(struct c2c_hist_entry *c2c_he,
 			    struct perf_sample *sample)
 {
-	if (WARN_ONCE(sample->cpu == (unsigned int) -1,
+	if (WARN_ONCE((sample->cpu == (unsigned int) -1) && !quiet,
 		      "WARNING: no sample cpu value"))
 		return;
 

@@ -1932,7 +1933,8 @@ static int setup_nodes(struct perf_session *session)
 		for (cpu = 0; cpu < map->nr; cpu++) {
 			set_bit(map->map[cpu], set);
 
-			if (WARN_ONCE(cpu2node[map->map[cpu]] != -1, "node/cpu topology bug"))
+			if (WARN_ONCE((cpu2node[map->map[cpu]] != -1) && !quiet,
+				      "node/cpu topology bug"))
 				return -EINVAL;
 
 			cpu2node[map->map[cpu]] = node;

@@ -2561,6 +2563,9 @@ static int perf_c2c__report(int argc, const char **argv)
 	if (argc)
 		usage_with_options(report_c2c_usage, options);
 
+	if (quiet)
+		perf_quiet_option();
+
 	if (c2c.stats_only)
 		c2c.use_stdio = true;
 

@@ -2707,6 +2712,9 @@ static int perf_c2c__record(int argc, const char **argv)
 	if (!rec_argv)
 		return -1;
 
+	if (quiet)
+		perf_quiet_option();
+
 	rec_argv[i++] = "record";
 
 	if (!event_set) {

index 7ad6e17ac6b3..895cc2fefa7d 100644
@@ -60,6 +60,7 @@ static int cmd_data_convert(int argc, const char **argv,
 	};
 	const struct option options[] = {
 		OPT_INCR('v', "verbose", &verbose, "be more verbose"),
+		OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any message"),
 		OPT_STRING('i', "input", &input_name, "file", "input file name"),
 #ifdef HAVE_LIBBABELTRACE_SUPPORT
 		OPT_STRING(0, "to-ctf", &to_ctf, NULL, "Convert to CTF format"),

@@ -81,6 +82,9 @@ static int cmd_data_convert(int argc, const char **argv,
 		return -1;
 	}
 
+	if (quiet)
+		perf_quiet_option();
+
 	if (to_ctf) {
 #ifdef HAVE_LIBBABELTRACE_SUPPORT
 		return bt_convert__perf2ctf(input_name, to_ctf, &opts);

index e09c4287fe87..37c2cf7d395f 100644
@@ -39,7 +39,7 @@ static int __cmd_evlist(const char *file_name, struct perf_attr_details *details
 			has_tracepoint = true;
 	}
 
-	if (has_tracepoint && !details->trace_fields)
+	if (has_tracepoint && !details->trace_fields && !quiet)
 		printf("# Tip: use 'perf evlist --trace-fields' to show fields for tracepoint events\n");
 
 	perf_session__delete(session);

@@ -54,6 +54,7 @@ int cmd_evlist(int argc, const char **argv, const char *prefix __maybe_unused)
 	OPT_BOOLEAN('F', "freq", &details.freq, "Show the sample frequency"),
 	OPT_BOOLEAN('v', "verbose", &details.verbose,
 		    "Show all event attr details"),
+	OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any message"),
 	OPT_BOOLEAN('g', "group", &details.event_group,
 		    "Show event group information"),
 	OPT_BOOLEAN('f', "force", &details.force, "don't complain, do it"),

@@ -69,6 +70,11 @@ int cmd_evlist(int argc, const char **argv, const char *prefix __maybe_unused)
 	if (argc)
 		usage_with_options(evlist_usage, options);
 
+	if (quiet) {
+		perf_quiet_option();
+		details.verbose = false;
+	}
+
 	if (details.event_group && (details.verbose || details.freq)) {
 		usage_with_options_msg(evlist_usage, options,
 			"--group option is not compatible with other options\n");

index 6087295f8827..2d8e8924cfe6 100644
@@ -321,8 +321,8 @@ int cmd_ftrace(int argc, const char **argv, const char *prefix __maybe_unused)
 		   "tracer to use: function_graph(default) or function"),
 	OPT_STRING('p', "pid", &ftrace.target.pid, "pid",
 		   "trace on existing process id"),
-	OPT_INCR('v', "verbose", &verbose,
-		 "be more verbose"),
+	OPT_INCR('v', "verbose", &verbose, "be more verbose"),
+	OPT_BOOLEAN('q', "quiet", &quiet, "do not show any message"),
 	OPT_BOOLEAN('a', "all-cpus", &ftrace.target.system_wide,
 		    "system-wide collection from all CPUs"),
 	OPT_STRING('C', "cpu", &ftrace.target.cpu_list, "cpu",

@@ -339,6 +339,9 @@ int cmd_ftrace(int argc, const char **argv, const char *prefix __maybe_unused)
 	if (!argc && target__none(&ftrace.target))
 		usage_with_options(ftrace_usage, ftrace_options);
 
+	if (quiet)
+		perf_quiet_option();
+
 	ret = target__validate(&ftrace.target);
 	if (ret) {
 		char errbuf[512];

index b9bc7e39833a..a2d94be1b27d 100644
@@ -484,8 +484,10 @@ static int perf_inject__sched_switch(struct perf_tool *tool,
 
 	ent = malloc(event->header.size + sizeof(struct event_entry));
 	if (ent == NULL) {
-		color_fprintf(stderr, PERF_COLOR_RED,
+		if (!quiet) {
+			color_fprintf(stderr, PERF_COLOR_RED,
 			     "Not enough memory to process sched switch event!");
+		}
 		return -1;
 	}
 

@@ -780,6 +782,7 @@ int cmd_inject(int argc, const char **argv, const char *prefix __maybe_unused)
 #endif
 		OPT_INCR('v', "verbose", &verbose,
 			 "be more verbose (show build ids, etc)"),
+		OPT_BOOLEAN('q', "quiet", &quiet, "do not show any message"),
 		OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name, "file",
 			   "kallsyms pathname"),
 		OPT_BOOLEAN('f', "force", &file.force, "don't complain, do it"),

@@ -805,13 +808,16 @@ int cmd_inject(int argc, const char **argv, const char *prefix __maybe_unused)
 	if (argc)
 		usage_with_options(inject_usage, options);
 
+	if (quiet)
+		perf_quiet_option();
+
 	if (inject.strip && !inject.itrace_synth_opts.set) {
 		pr_err("--strip option requires --itrace option\n");
 		return -1;
 	}
 
 	if (perf_data_file__open(&inject.output)) {
-		perror("failed to create output file");
+		pr_err("failed to create output file: %s\n", strerror(errno));
 		return -1;
 	}
 

index 224bfc454b4a..45a8e50a7f21 100644
@@ -29,7 +29,8 @@ static int __cmd_kallsyms(int argc, const char **argv)
 		struct symbol *symbol = machine__find_kernel_function_by_name(machine, argv[i], &map);
 
 		if (symbol == NULL) {
-			printf("%s: not found\n", argv[i]);
+			if (!quiet)
+				printf("%s: not found\n", argv[i]);
 			continue;
 		}
 

@@ -47,6 +48,7 @@ int cmd_kallsyms(int argc, const char **argv, const char *prefix __maybe_unused)
 {
 	const struct option options[] = {
 	OPT_INCR('v', "verbose", &verbose, "be more verbose (show counter open errors, etc)"),
+	OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any message"),
 	OPT_END()
 	};
 	const char * const kallsyms_usage[] = {

@@ -58,6 +60,9 @@ int cmd_kallsyms(int argc, const char **argv, const char *prefix __maybe_unused)
 	if (argc < 1)
 		usage_with_options(kallsyms_usage, options);
 
+	if (quiet)
+		perf_quiet_option();
+
 	symbol_conf.sort_by_name = true;
 	symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
 	if (symbol__init(NULL) < 0)

index 6da8d083e4e5..7148137c3a3d 100644
@@ -1895,6 +1895,7 @@ int cmd_kmem(int argc, const char **argv, const char *prefix __maybe_unused)
 	OPT_STRING('i', "input", &input_name, "file", "input file name"),
 	OPT_INCR('v', "verbose", &verbose,
 		    "be more verbose (show symbol address, etc)"),
+	OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any message"),
 	OPT_CALLBACK_NOOPT(0, "caller", NULL, NULL,
 			   "show per-callsite statistics", parse_caller_opt),
 	OPT_CALLBACK_NOOPT(0, "alloc", NULL, NULL,

@@ -1932,6 +1933,9 @@ int cmd_kmem(int argc, const char **argv, const char *prefix __maybe_unused)
 	if (!argc)
 		usage_with_options(kmem_usage, kmem_options);
 
+	if (quiet)
+		perf_quiet_option();
+
 	if (kmem_slab == 0 && kmem_page == 0) {
 		if (kmem_default == KMEM_SLAB)
 			kmem_slab = 1;

index 08fa88f62a24..1d121bb0a14d 100644
@@ -1018,7 +1018,7 @@ static int kvm_live_open_events(struct perf_kvm_stat *kvm)
 
 	err = perf_evlist__open(evlist);
 	if (err < 0) {
-		printf("Couldn't create the events: %s\n",
+		pr_err("Couldn't create the events: %s\n",
 		       str_error_r(errno, sbuf, sizeof(sbuf)));
 		goto out;
 	}

@@ -1313,6 +1313,7 @@ static int kvm_events_live(struct perf_kvm_stat *kvm,
 			perf_evlist__parse_mmap_pages),
 		OPT_INCR('v', "verbose", &verbose,
 			"be more verbose (show counter open errors, etc)"),
+		OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any message"),
 		OPT_BOOLEAN('a', "all-cpus", &kvm->opts.target.system_wide,
 			"system-wide collection from all CPUs"),
 		OPT_UINTEGER('d', "display", &kvm->display_time,

@@ -1372,6 +1373,9 @@ static int kvm_events_live(struct perf_kvm_stat *kvm,
 			usage_with_options(live_usage, live_options);
 	}
 
+	if (quiet)
+		perf_quiet_option();
+
 	kvm->duration *= NSEC_PER_USEC;   /* convert usec to nsec */
 
 	/*

@@ -1557,6 +1561,7 @@ int cmd_kvm(int argc, const char **argv, const char *prefix __maybe_unused)
 			   "file", "file saving guest os /proc/modules"),
 		OPT_INCR('v', "verbose", &verbose,
 			    "be more verbose (show counter open errors, etc)"),
+		OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any message"),
 		OPT_END()
 	};
 

@@ -1572,6 +1577,9 @@ int cmd_kvm(int argc, const char **argv, const char *prefix __maybe_unused)
 	if (!argc)
 		usage_with_options(kvm_usage, kvm_options);
 
+	if (quiet)
+		perf_quiet_option();
+
 	if (!perf_host)
 		perf_guest = 1;
 

index 3b9d98b5feef..b53b3597ee0f 100644
@@ -32,6 +32,7 @@ int cmd_list(int argc, const char **argv, const char *prefix __maybe_unused)
 			    "Print longer event descriptions."),
 		OPT_INCR(0, "debug", &verbose,
 			     "Enable debugging output"),
+		OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any message"),
 		OPT_END()
 	};
 	const char * const list_usage[] = {

@@ -44,9 +45,12 @@ int cmd_list(int argc, const char **argv, const char *prefix __maybe_unused)
 	argc = parse_options(argc, argv, list_options, list_usage,
 			     PARSE_OPT_STOP_AT_NON_OPTION);
 
+	if (quiet)
+		perf_quiet_option();
+
 	setup_pager();
 
-	if (!raw_dump && pager_in_use())
+	if (!raw_dump && pager_in_use() && !quiet)
 		printf("\nList of pre-defined events (to be used in -e):\n\n");
 
 	if (argc == 0) {

@@ -94,7 +98,8 @@ int cmd_list(int argc, const char **argv, const char *prefix __maybe_unused)
 			free(s);
 		} else {
 			if (asprintf(&s, "*%s*", argv[i]) < 0) {
-				printf("Critical: Not enough memory! Trying to continue...\n");
+				if (!quiet)
+					printf("Critical: Not enough memory! Trying to continue...\n");
 				continue;
 			}
 			print_symbol_events(s, PERF_TYPE_HARDWARE,

index ce3bfb48b26f..8197e5672413 100644
@@ -947,30 +947,26 @@ static int __cmd_record(int argc, const char **argv)
 
 int cmd_lock(int argc, const char **argv, const char *prefix __maybe_unused)
 {
-	const struct option info_options[] = {
-	OPT_BOOLEAN('t', "threads", &info_threads,
-		    "dump thread list in perf.data"),
-	OPT_BOOLEAN('m', "map", &info_map,
-		    "map of lock instances (address:name table)"),
-	OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
-	OPT_END()
-	};
 	const struct option lock_options[] = {
 	OPT_STRING('i', "input", &input_name, "file", "input file name"),
 	OPT_INCR('v', "verbose", &verbose, "be more verbose (show symbol address, etc)"),
 	OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace, "dump raw trace in ASCII"),
+	OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any message"),
+	OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
 	OPT_END()
 	};
 	const struct option report_options[] = {
 	OPT_STRING('k', "key", &sort_key, "acquired",
 		    "key for sorting (acquired / contended / avg_wait / wait_total / wait_max / wait_min)"),
-	OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
 	/* TODO: type */
-	OPT_END()
+	OPT_PARENT(lock_options)
 	};
-	const char * const info_usage[] = {
-		"perf lock info [<options>]",
-		NULL
+	const struct option info_options[] = {
+	OPT_BOOLEAN('t', "threads", &info_threads,
+		    "dump thread list in perf.data"),
+	OPT_BOOLEAN('m', "map", &info_map,
+		    "map of lock instances (address:name table)"),
+	OPT_PARENT(lock_options)
 	};
 	const char *const lock_subcommands[] = { "record", "report", "script",
 						 "info", NULL };

@@ -982,6 +978,10 @@ int cmd_lock(int argc, const char **argv, const char *prefix __maybe_unused)
 		"perf lock report [<options>]",
 		NULL
 	};
+	const char * const info_usage[] = {
+		"perf lock info [<options>]",
+		NULL
+	};
 	unsigned int i;
 	int rc = 0;
 

@@ -993,6 +993,9 @@ int cmd_lock(int argc, const char **argv, const char *prefix __maybe_unused)
 	if (!argc)
 		usage_with_options(lock_usage, lock_options);
 
+	if (quiet)
+		perf_quiet_option();
+
 	if (!strncmp(argv[0], "rec", 3)) {
 		return __cmd_record(argc, argv);
 	} else if (!strncmp(argv[0], "report", 6)) {

@@ -1002,6 +1005,8 @@ int cmd_lock(int argc, const char **argv, const char *prefix __maybe_unused)
 					     report_options, report_usage, 0);
 			if (argc)
 				usage_with_options(report_usage, report_options);
+			if (quiet && verbose >= 0)
+				perf_quiet_option();
 		}
 		rc = __cmd_report(false);
 	} else if (!strcmp(argv[0], "script")) {

@@ -1013,6 +1018,8 @@ int cmd_lock(int argc, const char **argv, const char *prefix __maybe_unused)
 					     info_options, info_usage, 0);
 			if (argc)
 				usage_with_options(info_usage, info_options);
+			if (quiet && verbose >= 0)
+				perf_quiet_option();
 		}
 		/* recycling report_lock_ops */
 		trace_handler = &report_lock_ops;

index 6114e07ca613..24d084327c1e 100644
@@ -70,6 +70,7 @@ static int __cmd_record(int argc, const char **argv, struct perf_mem *mem)
 	OPT_UINTEGER(0, "ldlat", &perf_mem_events__loads_ldlat, "mem-loads latency"),
 	OPT_INCR('v', "verbose", &verbose,
 		 "be more verbose (show counter open errors, etc)"),
+	OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any message"),
 	OPT_BOOLEAN('U', "all-user", &all_user, "collect only user level data"),
 	OPT_BOOLEAN('K', "all-kernel", &all_kernel, "collect only kernel level data"),
 	OPT_END()

@@ -83,6 +84,9 @@ static int __cmd_record(int argc, const char **argv, struct perf_mem *mem)
 	if (!rec_argv)
 		return -1;
 
+	if (quiet)
+		perf_quiet_option();
+
 	rec_argv[i++] = "record";
 
 	if (mem->operation & MEM_OPERATION_LOAD)

@@ -144,7 +148,7 @@ dump_raw_samples(struct perf_tool *tool,
 	struct addr_location al;
 	const char *fmt;
 
-	if (machine__resolve(machine, &al, sample) < 0) {
+	if (machine__resolve(machine, &al, sample) < 0 && !quiet) {
 		fprintf(stderr, "problem processing %d event, skipping it.\n",
 				event->header.type);
 		return -1;

index b94cf0de715a..9847b5bf081c 100644
@@ -3297,6 +3297,7 @@ int cmd_sched(int argc, const char **argv, const char *prefix __maybe_unused)
 	OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
 		    "dump raw trace in ASCII"),
 	OPT_BOOLEAN('f', "force", &sched.force, "don't complain, do it"),
+	OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any message"),
 	OPT_END()
 	};
 	const struct option latency_options[] = {

@@ -3396,6 +3397,9 @@ int cmd_sched(int argc, const char **argv, const char *prefix __maybe_unused)
 	if (!argc)
 		usage_with_options(sched_usage, sched_options);
 
+	if (quiet)
+		perf_quiet_option();
+
 	/*
 	 * Aliased to 'perf script' for now:
 	 */

@@ -3410,6 +3414,8 @@ int cmd_sched(int argc, const char **argv, const char *prefix __maybe_unused)
 			argc = parse_options(argc, argv, latency_options, latency_usage, 0);
 			if (argc)
 				usage_with_options(latency_usage, latency_options);
+			if (quiet && verbose >= 0)
+				perf_quiet_option();
 		}
 		setup_sorting(&sched, latency_options, latency_usage);
 		return perf_sched__lat(&sched);

@@ -3418,6 +3424,8 @@ int cmd_sched(int argc, const char **argv, const char *prefix __maybe_unused)
 			argc = parse_options(argc, argv, map_options, map_usage, 0);
 			if (argc)
 				usage_with_options(map_usage, map_options);
+			if (quiet && verbose >= 0)
+				perf_quiet_option();
 		}
 		sched.tp_handler = &map_ops;
 		setup_sorting(&sched, latency_options, latency_usage);

@@ -3428,6 +3436,8 @@ int cmd_sched(int argc, const char **argv, const char *prefix __maybe_unused)
 			argc = parse_options(argc, argv, replay_options, replay_usage, 0);
 			if (argc)
 				usage_with_options(replay_usage, replay_options);
+			if (quiet && verbose >= 0)
+				perf_quiet_option();
 		}
 		return perf_sched__replay(&sched);
 	} else if (!strcmp(argv[0], "timehist")) {

@@ -3436,6 +3446,8 @@ int cmd_sched(int argc, const char **argv, const char *prefix __maybe_unused)
 					     timehist_usage, 0);
 			if (argc)
 				usage_with_options(timehist_usage, timehist_options);
+			if (quiet && verbose >= 0)
+				perf_quiet_option();
 		}
 		if (sched.show_wakeups && sched.summary_only) {
 			pr_err(" Error: -s and -w are mutually exclusive.\n");

index c0783b4f7b6c..d1c95f0b8a0f 100644
@@ -1394,14 +1394,14 @@ static int parse_scriptname(const struct option *opt __maybe_unused,
 	if (script) {
 		len = script - str;
 		if (len >= PATH_MAX) {
-			fprintf(stderr, "invalid language specifier");
+			pr_err("invalid language specifier");
 			return -1;
 		}
 		strncpy(spec, str, len);
 		spec[len] = '\0';
 		scripting_ops = script_spec__lookup(spec);
 		if (!scripting_ops) {
-			fprintf(stderr, "invalid language specifier");
+			pr_err("invalid language specifier");
 			return -1;
 		}
 		script++;

@@ -1409,12 +1409,12 @@ static int parse_scriptname(const struct option *opt __maybe_unused,
 		script = str;
 		ext = strrchr(script, '.');
 		if (!ext) {
-			fprintf(stderr, "invalid script extension");
+			pr_err("invalid script extension");
 			return -1;
 		}
 		scripting_ops = script_spec__lookup(++ext);
 		if (!scripting_ops) {
-			fprintf(stderr, "invalid script extension");
+			pr_err("invalid script extension");
 			return -1;
 		}
 	}

@@ -1472,8 +1472,7 @@ static int parse_output_fields(const struct option *opt __maybe_unused,
 	} else {
 		tok = str;
 		if (strlen(str) == 0) {
-			fprintf(stderr,
-				"Cannot set fields to 'none' for all event types.\n");
+			pr_err("Cannot set fields to 'none' for all event types.\n");
 			rc = -EINVAL;
 			goto out;
 		}

@@ -1498,7 +1497,7 @@ static int parse_output_fields(const struct option *opt __maybe_unused,
 			continue;
 		}
 		if (i == imax) {
-			fprintf(stderr, "Invalid field requested.\n");
+			pr_err("Invalid field requested.\n");
 			rc = -EINVAL;
 			goto out;
 		}

@@ -1516,7 +1515,7 @@ static int parse_output_fields(const struct option *opt __maybe_unused,
 			}
 		} else {
 			if (output[type].invalid_fields & all_output_options[i].field) {
-				fprintf(stderr, "\'%s\' not valid for %s events.\n",
+				pr_err("\'%s\' not valid for %s events.\n",
 					 all_output_options[i].str, event_type(type));
 
 				rc = -EINVAL;

@@ -1722,8 +1721,7 @@ static int list_available_scripts(const struct option *opt __maybe_unused,
 
 	scripts_dir = opendir(scripts_path);
 	if (!scripts_dir) {
-		fprintf(stdout,
-			"open(%s) failed.\n"
+		pr_err("open(%s) failed.\n"
 			"Check \"PERF_EXEC_PATH\" env to set scripts dir.\n",
 			scripts_path);
 		exit(-1);

@@ -2205,6 +2203,7 @@ int cmd_script(int argc, const char **argv, const char *prefix __maybe_unused)
 		"perf script [<options>] <top-script> [script-args]",
 		NULL
 	};
+	char errbuf[STRERR_BUFSIZE];
 
 	setup_scripting();
 

@@ -2223,8 +2222,7 @@ int cmd_script(int argc, const char **argv, const char *prefix __maybe_unused)
 	if (argc > 1 && !strncmp(argv[0], "rep", strlen("rep"))) {
 		rep_script_path = get_script_path(argv[1], REPORT_SUFFIX);
 		if (!rep_script_path) {
-			fprintf(stderr,
-				"Please specify a valid report script"
+			pr_err("Please specify a valid report script"
 				"(see 'perf script -l' for listing)\n");
 			return -1;
 		}

@@ -2267,13 +2265,15 @@ int cmd_script(int argc, const char **argv, const char *prefix __maybe_unused)
 		}
 
 		if (pipe(live_pipe) < 0) {
-			perror("failed to create pipe");
+			pr_err("failed to create pipe: %s\n",
+			       str_error_r(errno, errbuf, sizeof(errbuf)));
 			return -1;
 		}
 
 		pid = fork();
 		if (pid < 0) {
-			perror("failed to fork");
+			pr_err("failed to fork: %s\n",
+			       str_error_r(errno, errbuf, sizeof(errbuf)));
 			return -1;
 		}
 

@@ -2424,8 +2424,7 @@ int cmd_script(int argc, const char **argv, const char *prefix __maybe_unused)
 		int input;
 
 		if (output_set_by_user()) {
-			fprintf(stderr,
-				"custom fields not supported for generated scripts");
+			pr_err("custom fields not supported for generated scripts");
 			err = -EINVAL;
 			goto out_delete;
 		}

@@ -2433,24 +2432,26 @@ int cmd_script(int argc, const char **argv, const char *prefix __maybe_unused)
 		input = open(file.path, O_RDONLY);	/* input_name */
 		if (input < 0) {
 			err = -errno;
-			perror("failed to open file");
+			pr_err("failed to open file: %s\n",
+			       str_error_r(errno, errbuf, sizeof(errbuf)));
 			goto out_delete;
 		}
 
 		err = fstat(input, &perf_stat);
 		if (err < 0) {
-			perror("failed to stat file");
+			pr_err("failed to stat file: %s\n",
+			       str_error_r(errno, errbuf, sizeof(errbuf)));
 			goto out_delete;
 		}
 
 		if (!perf_stat.st_size) {
-			fprintf(stderr, "zero-sized file, nothing to do!\n");
+			pr_err("zero-sized file, nothing to do!\n");
 			goto out_delete;
 		}
 
 		scripting_ops = script_spec__lookup(generate_script_lang);
 		if (!scripting_ops) {
-			fprintf(stderr, "invalid language specifier");
+			pr_err("invalid language specifier");
 			err = -ENOENT;
 			goto out_delete;
 		}

index d1c95f0b8a0f..f46498f2e73a 100644
@@ -2122,6 +2122,7 @@ int cmd_script(int argc, const char **argv, const char *prefix __maybe_unused)
 		    "dump raw trace in ASCII"),
 	OPT_INCR('v', "verbose", &verbose,
 		 "be more verbose (show symbol address, etc)"),
+	OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any message"),
 	OPT_BOOLEAN('L', "Latency", &latency_format,
 		    "show latency attributes (irqs/preemption disabled, etc)"),
 	OPT_CALLBACK_NOOPT('l', "list", NULL, NULL, "list available scripts",

@@ -2210,6 +2211,9 @@ int cmd_script(int argc, const char **argv, const char *prefix __maybe_unused)
 	argc = parse_options_subcommand(argc, argv, options, script_subcommands, script_usage,
 			     PARSE_OPT_STOP_AT_NON_OPTION);
 
+	if (quiet)
+		perf_quiet_option();
+
 	file.path = input_name;
 	file.force = symbol_conf.force;
 

index f53f449d864d..ee7190da9b6e 100644
@@ -555,7 +555,8 @@ static int __run_perf_stat(int argc, const char **argv)
 	if (forks) {
 		if (perf_evlist__prepare_workload(evsel_list, &target, argv, is_pipe,
 						  workload_exec_failed_signal) < 0) {
-			perror("failed to prepare workload");
+			pr_err("failed to prepare workload: %s\n",
+			       str_error_r(errno, msg, sizeof(msg)));
 			return -1;
 		}
 		child_pid = evsel_list->workload.pid;

@@ -608,14 +609,14 @@ static int __run_perf_stat(int argc, const char **argv)
 	}
 
 	if (perf_evlist__apply_filters(evsel_list, &counter)) {
-		error("failed to set filter \"%s\" on event %s with %d (%s)\n",
+		pr_err("failed to set filter \"%s\" on event %s with %d (%s)\n",
 			counter->filter, perf_evsel__name(counter), errno,
 			str_error_r(errno, msg, sizeof(msg)));
 		return -1;
 	}
 
 	if (perf_evlist__apply_drv_configs(evsel_list, &counter, &err_term)) {
-		error("failed to set config \"%s\" on event %s with %d (%s)\n",
+		pr_err("failed to set config \"%s\" on event %s with %d (%s)\n",
 		      err_term->val.drv_cfg, perf_evsel__name(counter), errno,
 		      str_error_r(errno, msg, sizeof(msg)));
 		return -1;

@@ -1725,18 +1726,21 @@ static int perf_stat__get_core_cached(struct cpu_map *map, int idx)
 static int perf_stat_init_aggr_mode(void)
 {
 	int nr;
+	char errbuf[STRERR_BUFSIZE];
 
 	switch (stat_config.aggr_mode) {
 	case AGGR_SOCKET:
 		if (cpu_map__build_socket_map(evsel_list->cpus, &aggr_map)) {
-			perror("cannot build socket map");
+			pr_err("cannot build socket map: %s\n",
+			       str_error_r(errno, errbuf, sizeof(errbuf)));
 			return -1;
 		}
 		aggr_get_id = perf_stat__get_socket_cached;
 		break;
 	case AGGR_CORE:
 		if (cpu_map__build_core_map(evsel_list->cpus, &aggr_map)) {
-			perror("cannot build core map");
+			pr_err("cannot build core map: %s\n",
+			       str_error_r(errno, errbuf, sizeof(errbuf)));
 			return -1;
 		}
 		aggr_get_id = perf_stat__get_core_cached;

@@ -1835,18 +1839,21 @@ static int perf_stat__get_core_file(struct cpu_map *map, int idx)
 static int perf_stat_init_aggr_mode_file(struct perf_stat *st)
 {
 	struct perf_env *env = &st->session->header.env;
+	char errbuf[STRERR_BUFSIZE];
 
 	switch (stat_config.aggr_mode) {
 	case AGGR_SOCKET:
 		if (perf_env__build_socket_map(env, evsel_list->cpus, &aggr_map)) {
-			perror("cannot build socket map");
+			pr_err("cannot build socket map: %s\n",
+			       str_error_r(errno, errbuf, sizeof(errbuf)));
 			return -1;
 		}
 		aggr_get_id = perf_stat__get_socket_file;
 		break;
 	case AGGR_CORE:
 		if (perf_env__build_core_map(env, evsel_list->cpus, &aggr_map)) {
-			perror("cannot build core map");
+			pr_err("cannot build core map: %s\n",
+			       str_error_r(errno, errbuf, sizeof(errbuf)));
 			return -1;
 		}
 		aggr_get_id = perf_stat__get_core_file;

@@ -2042,7 +2049,7 @@ static int add_default_attributes(void)
 		else
 			err = parse_events(evsel_list, transaction_limited_attrs, NULL);
 		if (err) {
-			fprintf(stderr, "Cannot set up transaction events\n");
+			pr_err("Cannot set up transaction events\n");
 			return -1;
 		}
 		return 0;

@@ -2075,14 +2082,13 @@ static int add_default_attributes(void)
 				arch_topdown_group_warn();
 			err = parse_events(evsel_list, str, NULL);
 			if (err) {
-				fprintf(stderr,
-					"Cannot set up top down events %s: %d\n",
+				pr_err("Cannot set up top down events %s: %d\n",
 					str, err);
 				free(str);
 				return -1;
 			}
 		} else {
-			fprintf(stderr, "System does not support topdown\n");
+			pr_err("System does not support topdown\n");
 			return -1;
 		}
 		free(str);

@@ -2390,6 +2396,7 @@ int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
 	FILE *output = stderr;
 	unsigned int interval;
 	const char * const stat_subcommands[] = { "record", "report" };
+	char errbuf[STRERR_BUFSIZE];
 
 	setlocale(LC_ALL, "");
 

@@ -2426,24 +2433,24 @@ int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
 		output = NULL;
 
 	if (output_name && output_fd) {
-		fprintf(stderr, "cannot use both --output and --log-fd\n");
+		pr_err("cannot use both --output and --log-fd\n");
 		parse_options_usage(stat_usage, stat_options, "o", 1);
 		parse_options_usage(NULL, stat_options, "log-fd", 0);
 		goto out;
 	}
 
 	if (metric_only && stat_config.aggr_mode == AGGR_THREAD) {
-		fprintf(stderr, "--metric-only is not supported with --per-thread\n");
+		pr_err("--metric-only is not supported with --per-thread\n");
 		goto out;
 	}
 
 	if (metric_only && run_count > 1) {
-		fprintf(stderr, "--metric-only is not supported with -r\n");
+		pr_err("--metric-only is not supported with -r\n");
 		goto out;
 	}
 
 	if (output_fd < 0) {
-		fprintf(stderr, "argument to --log-fd must be a > 0\n");
+		pr_err("argument to --log-fd must be a > 0\n");
 		parse_options_usage(stat_usage, stat_options, "log-fd", 0);
 		goto out;
 	}

@@ -2454,7 +2461,8 @@ int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
 
 		output = fopen(output_name, mode);
 		if (!output) {
-			perror("failed to create output file");
+			pr_err("failed to create output file: %s\n",
+			       str_error_r(errno, errbuf, sizeof(errbuf)));
 			return -1;
 		}
 		clock_gettime(CLOCK_REALTIME, &tm);

@@ -2463,7 +2471,8 @@ int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
 		mode = append_file ? "a" : "w";
 		output = fdopen(output_fd, mode);
 		if (!output) {
-			perror("Failed opening logfd");
+			pr_err("Failed opening logfd: %s\n",
+			       str_error_r(errno, errbuf, sizeof(errbuf)));
 			return -errno;
 		}
 	}

@@ -2476,7 +2485,7 @@ int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
 	if (csv_output) {
 		/* User explicitly passed -B? */
 		if (big_num_opt == 1) {
-			fprintf(stderr, "-B option not supported with -x\n");
+			pr_err("-B option not supported with -x\n");
 			parse_options_usage(stat_usage, stat_options, "B", 1);
 			parse_options_usage(NULL, stat_options, "x", 1);
 			goto out;

@@ -2497,7 +2506,7 @@ int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
 	}
 
 	if ((stat_config.aggr_mode == AGGR_THREAD) && !target__has_task(&target)) {
-		fprintf(stderr, "The --per-thread option is only available "
+		pr_err("The --per-thread option is only available "
 			"when monitoring via -p -t options.\n");
 		parse_options_usage(NULL, stat_options, "p", 1);
 		parse_options_usage(NULL, stat_options, "t", 1);

@@ -2511,7 +2520,7 @@ int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
 	if (((stat_config.aggr_mode != AGGR_GLOBAL &&
 	      stat_config.aggr_mode != AGGR_THREAD) || nr_cgroups) &&
 	    !target__has_cpu(&target)) {
-		fprintf(stderr, "both cgroup and no-aggregation "
+		pr_err("both cgroup and no-aggregation "
 			"modes only available in system-wide mode\n");
 
 		parse_options_usage(stat_usage, stat_options, "G", 1);

@@ -2531,7 +2540,8 @@ int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
 			parse_options_usage(stat_usage, stat_options, "p", 1);
 			parse_options_usage(NULL, stat_options, "t", 1);
 		} else if (target__has_cpu(&target)) {
-			perror("failed to parse CPUs map");
+			pr_err("failed to parse CPUs map: %s\n",
+			       str_error_r(errno, errbuf, sizeof(errbuf)));
 			parse_options_usage(stat_usage, stat_options, "C", 1);
 			parse_options_usage(NULL, stat_options, "a", 1);
 		}

index ee7190da9b6e..9dbb08c038e1 100644
@@ -1630,6 +1630,7 @@ static const struct option stat_options[] = {
 	OPT_BOOLEAN('c', "scale", &stat_config.scale, "scale/normalize counters"),
 	OPT_INCR('v', "verbose", &verbose,
 		    "be more verbose (show counter open errors, etc)"),
+	OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any message"),
 	OPT_INTEGER('r', "repeat", &run_count,
 		    "repeat command and print average + stddev (max: 100, forever: 0)"),
 	OPT_BOOLEAN('n', "null", &null_run,

@@ -2163,6 +2164,9 @@ static int __cmd_record(int argc, const char **argv)
 	argc = parse_options(argc, argv, stat_options, stat_record_usage,
 			     PARSE_OPT_STOP_AT_NON_OPTION);
 
+	if (quiet)
+		perf_quiet_option();
+
 	if (output_name)
 		file->path = output_name;
 

@@ -2410,6 +2414,9 @@ int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
 					PARSE_OPT_STOP_AT_NON_OPTION);
 	perf_stat__init_shadow_stats();
 
+	if (quiet)
+		perf_quiet_option();
+
 	if (csv_sep) {
 		csv_output = true;
 		if (!strcmp(csv_sep, "\\t"))

index ab9077915763..18b68c8495d6 100644
@@ -372,7 +372,7 @@ static void perf_top__prompt_symbol(struct perf_top *top, const char *msg)
 	}
 
 	if (!found) {
-		fprintf(stderr, "Sorry, %s is not active.\n", buf);
+		pr_err("Sorry, %s is not active.\n", buf);
 		sleep(1);
 	} else
 		perf_top__parse_source(top, found);

@@ -1142,6 +1142,7 @@ int cmd_top(int argc, const char **argv, const char *prefix __maybe_unused)
 	OPT_BOOLEAN(0, "stdio", &top.use_stdio, "Use the stdio interface"),
 	OPT_INCR('v', "verbose", &verbose,
 		    "be more verbose (show counter open errors, etc)"),
+	OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any message"),
 	OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
 		   "sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, ..."
 		   " Please refer the man page for the complete list."),

@@ -1224,6 +1225,9 @@ int cmd_top(int argc, const char **argv, const char *prefix __maybe_unused)
 	if (argc)
 		usage_with_options(top_usage, options);
 
+	if (quiet)
+		perf_quiet_option();
+
 	if (!top.evlist->nr_entries &&
 	    perf_evlist__add_default(top.evlist) < 0) {
 		pr_err("Not enough memory for event selector list\n");

index 256f1fac6f7e..00e1349c73bf 100644
@@ -1242,7 +1242,7 @@ static int trace__validate_ev_qualifier(struct trace *trace)
 	trace->ev_qualifier_ids.entries = malloc(trace->ev_qualifier_ids.nr *
 						 sizeof(trace->ev_qualifier_ids.entries[0]));
 
-	if (trace->ev_qualifier_ids.entries == NULL) {
+	if (trace->ev_qualifier_ids.entries == NULL && !quiet) {
 		fputs("Error:\tNot enough memory for allocating events qualifier ids\n",
 		       trace->output);
 		err = -EINVAL;

@@ -1257,7 +1257,8 @@ static int trace__validate_ev_qualifier(struct trace *trace)
 
 		if (id < 0) {
 			if (err == 0) {
-				fputs("Error:\tInvalid syscall ", trace->output);
+				if (!quiet)
+					fputs("Error:\tInvalid syscall ", trace->output);
 				err = -EINVAL;
 			} else {
 				fputs(", ", trace->output);

@@ -1270,8 +1271,10 @@ static int trace__validate_ev_qualifier(struct trace *trace)
 	}
 
 	if (err < 0) {
-		fputs("\nHint:\ttry 'perf list syscalls:sys_enter_*'"
-		      "\nHint:\tand: 'man syscalls'\n", trace->output);
+		if (verbose >= 0) {
+			fputs("\nHint:\ttry 'perf list syscalls:sys_enter_*'"
+			      "\nHint:\tand: 'man syscalls'\n", trace->output);
+		}
 		zfree(&trace->ev_qualifier_ids.entries);
 		trace->ev_qualifier_ids.nr = 0;
 	}

@@ -2604,7 +2607,7 @@ static size_t trace__fprintf_thread_summary(struct trace *trace, FILE *fp)
 	size_t printed = trace__fprintf_threads_header(fp);
 	struct rb_node *nd;
 
-	if (threads == NULL) {
+	if (threads == NULL && !quiet) {
 		fprintf(fp, "%s", "Error sorting output by nr_events!\n");
 		return 0;
 	}

@@ -2761,7 +2764,7 @@ static int trace__parse_events_option(const struct option *opt, const char *str,
 		};
 
 		trace->ev_qualifier = strlist__new(lists[1], &slist_config);
-		if (trace->ev_qualifier == NULL) {
+		if (trace->ev_qualifier == NULL && !quiet) {
 			fputs("Not enough memory to parse event qualifier", trace->output);
 			goto out;
 		}

@@ -2849,6 +2852,7 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
 		     trace__set_duration),
 	OPT_BOOLEAN(0, "sched", &trace.sched, "show blocking scheduler events"),
 	OPT_INCR('v', "verbose", &verbose, "be more verbose"),
+	OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any message"),
 	OPT_BOOLEAN('T', "time", &trace.full_time,
 		    "Show full timestamp, not time relative to first start"),
 	OPT_BOOLEAN('s', "summary", &trace.summary_only,

@@ -2898,6 +2902,8 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
 
 	argc = parse_options_subcommand(argc, argv, trace_options, trace_subcommands,
 				 trace_usage, PARSE_OPT_STOP_AT_NON_OPTION);
+	if (quiet)
+		perf_quiet_option();
 
 	err = bpf__setup_stdout(trace.evlist);
 	if (err) {

@@ -2957,7 +2963,8 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
 	if (output_name != NULL) {
 		err = trace__open_output(&trace, output_name);
 		if (err < 0) {
-			perror("failed to create output file");
+			pr_err("failed to create output file: %s\n",
+			       str_error_r(errno, bf, sizeof(bf)));
 			goto out;
 		}
 	}

@@ -2966,15 +2973,19 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
 
 	err = target__validate(&trace.opts.target);
 	if (err) {
-		target__strerror(&trace.opts.target, err, bf, sizeof(bf));
-		fprintf(trace.output, "%s", bf);
+		if (!quiet) {
+			target__strerror(&trace.opts.target, err, bf, sizeof(bf));
+			fprintf(trace.output, "%s", bf);
+		}
 		goto out_close;
 	}
 
 	err = target__parse_uid(&trace.opts.target);
 	if (err) {
-		target__strerror(&trace.opts.target, err, bf, sizeof(bf));
-		fprintf(trace.output, "%s", bf);
+		if (!quiet) {
+			target__strerror(&trace.opts.target, err, bf, sizeof(bf));
+			fprintf(trace.output, "%s", bf);
+		}
 		goto out_close;
 	}