perf list: Allow filtering list of events

The man page has the details, here are some examples:

[root@emilia ~]# perf list *fault*  *:*wait*

List of pre-defined events (to be used in -e):
  page-faults OR faults                      [Software event]
  minor-faults                               [Software event]
  major-faults                               [Software event]
  alignment-faults                           [Software event]
  emulation-faults                           [Software event]

  radeon:radeon_fence_wait_begin             [Tracepoint event]
  radeon:radeon_fence_wait_end               [Tracepoint event]
  writeback:wbc_writeback_wait               [Tracepoint event]
  writeback:wbc_balance_dirty_wait           [Tracepoint event]
  writeback:writeback_congestion_wait        [Tracepoint event]
  writeback:writeback_wait_iff_congested     [Tracepoint event]
  sched:sched_wait_task                      [Tracepoint event]
  sched:sched_process_wait                   [Tracepoint event]
  sched:sched_stat_wait                      [Tracepoint event]
  sched:sched_stat_iowait                    [Tracepoint event]
  syscalls:sys_enter_epoll_wait              [Tracepoint event]
  syscalls:sys_exit_epoll_wait               [Tracepoint event]
  syscalls:sys_enter_epoll_pwait             [Tracepoint event]
  syscalls:sys_exit_epoll_pwait              [Tracepoint event]
  syscalls:sys_enter_rt_sigtimedwait         [Tracepoint event]
  syscalls:sys_exit_rt_sigtimedwait          [Tracepoint event]
  syscalls:sys_enter_waitid                  [Tracepoint event]
  syscalls:sys_exit_waitid                   [Tracepoint event]
  syscalls:sys_enter_wait4                   [Tracepoint event]
  syscalls:sys_exit_wait4                    [Tracepoint event]
  syscalls:sys_enter_waitpid                 [Tracepoint event]
  syscalls:sys_exit_waitpid                  [Tracepoint event]
[root@emilia ~]#

Suggested-by: Ingo Molnar <mingo@elte.hu>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 80 insertions, 19 deletions

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 80a3dd5ef57..54a7e2634d5 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -858,7 +858,7 @@ static const char * const event_type_descriptors[] = {
  * Print the events from <debugfs_mount_point>/tracing/events
  */
 
-static void print_tracepoint_events(void)
+void print_tracepoint_events(const char *subsys_glob, const char *event_glob)
 {
 	DIR *sys_dir, *evt_dir;
 	struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
@@ -873,6 +873,9 @@ static void print_tracepoint_events(void)
 		return;
 
 	for_each_subsystem(sys_dir, sys_dirent, sys_next) {
+		if (subsys_glob != NULL && 
+		    !strglobmatch(sys_dirent.d_name, subsys_glob))
+			continue;
 
 		snprintf(dir_path, MAXPATHLEN, "%s/%s", debugfs_path,
 			 sys_dirent.d_name);
@@ -881,6 +884,10 @@ static void print_tracepoint_events(void)
 			continue;
 
 		for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next) {
+			if (event_glob != NULL && 
+			    !strglobmatch(evt_dirent.d_name, event_glob))
+				continue;
+
 			snprintf(evt_path, MAXPATHLEN, "%s:%s",
 				 sys_dirent.d_name, evt_dirent.d_name);
 			printf("  %-42s [%s]\n", evt_path,
@@ -932,13 +939,61 @@ int is_valid_tracepoint(const char *event_string)
 	return 0;
 }
 
+void print_events_type(u8 type)
+{
+	struct event_symbol *syms = event_symbols;
+	unsigned int i;
+	char name[64];
+
+	for (i = 0; i < ARRAY_SIZE(event_symbols); i++, syms++) {
+		if (type != syms->type)
+			continue;
+
+		if (strlen(syms->alias))
+			snprintf(name, sizeof(name),  "%s OR %s",
+				 syms->symbol, syms->alias);
+		else
+			snprintf(name, sizeof(name), "%s", syms->symbol);
+
+		printf("  %-42s [%s]\n", name,
+			event_type_descriptors[type]);
+	}
+}
+
+int print_hwcache_events(const char *event_glob)
+{
+	unsigned int type, op, i, printed = 0;
+
+	for (type = 0; type < PERF_COUNT_HW_CACHE_MAX; type++) {
+		for (op = 0; op < PERF_COUNT_HW_CACHE_OP_MAX; op++) {
+			/* skip invalid cache type */
+			if (!is_cache_op_valid(type, op))
+				continue;
+
+			for (i = 0; i < PERF_COUNT_HW_CACHE_RESULT_MAX; i++) {
+				char *name = event_cache_name(type, op, i);
+
+				if (event_glob != NULL && 
+				    !strglobmatch(name, event_glob))
+					continue;
+
+				printf("  %-42s [%s]\n", name,
+					event_type_descriptors[PERF_TYPE_HW_CACHE]);
+				++printed;
+			}
+		}
+	}
+
+	return printed;
+}
+
 /*
  * Print the help text for the event symbols:
  */
-void print_events(void)
+void print_events(const char *event_glob)
 {
 	struct event_symbol *syms = event_symbols;
-	unsigned int i, type, op, prev_type = -1;
+	unsigned int i, type, prev_type = -1, printed = 0, ntypes_printed = 0;
 	char name[40];
 
 	printf("\n");
@@ -947,8 +1002,16 @@ void print_events(void)
 	for (i = 0; i < ARRAY_SIZE(event_symbols); i++, syms++) {
 		type = syms->type;
 
-		if (type != prev_type)
+		if (type != prev_type && printed) {
 			printf("\n");
+			printed = 0;
+			ntypes_printed++;
+		}
+
+		if (event_glob != NULL && 
+		    !(strglobmatch(syms->symbol, event_glob) ||
+		      (syms->alias && strglobmatch(syms->alias, event_glob))))
+			continue;
 
 		if (strlen(syms->alias))
 			sprintf(name, "%s OR %s", syms->symbol, syms->alias);
@@ -958,22 +1021,17 @@ void print_events(void)
 			event_type_descriptors[type]);
 
 		prev_type = type;
+		++printed;
 	}
 
-	printf("\n");
-	for (type = 0; type < PERF_COUNT_HW_CACHE_MAX; type++) {
-		for (op = 0; op < PERF_COUNT_HW_CACHE_OP_MAX; op++) {
-			/* skip invalid cache type */
-			if (!is_cache_op_valid(type, op))
-				continue;
-
-			for (i = 0; i < PERF_COUNT_HW_CACHE_RESULT_MAX; i++) {
-				printf("  %-42s [%s]\n",
-					event_cache_name(type, op, i),
-					event_type_descriptors[PERF_TYPE_HW_CACHE]);
-			}
-		}
+	if (ntypes_printed) {
+		printed = 0;
+		printf("\n");
 	}
+	print_hwcache_events(event_glob);
+
+	if (event_glob != NULL)
+		return;
 
 	printf("\n");
 	printf("  %-42s [%s]\n",
@@ -986,7 +1044,7 @@ void print_events(void)
 			event_type_descriptors[PERF_TYPE_BREAKPOINT]);
 	printf("\n");
 
-	print_tracepoint_events();
+	print_tracepoint_events(NULL, NULL);
 
 	exit(129);
 }
diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
index cf7e94abb67..212f88e07a9 100644
--- a/tools/perf/util/parse-events.h
+++ b/tools/perf/util/parse-events.h
@@ -28,7 +28,10 @@ extern int parse_filter(const struct option *opt, const char *str, int unset);
 
 #define EVENTS_HELP_MAX (128*1024)
 
-extern void print_events(void);
+void print_events(const char *event_glob);
+void print_events_type(u8 type);
+void print_tracepoint_events(const char *subsys_glob, const char *event_glob);
+int print_hwcache_events(const char *event_glob);
 extern int is_valid_tracepoint(const char *event_string);
 
 extern char debugfs_path[];