[PATCH] perf tools: Only save the event formats we need

From: Frederic Weisbecker
Date: Thu Aug 27 2009 - 21:10:21 EST

While opening a trace event counter, every events are saved in the
trace.info file. But we only want to save the specifications of the
events we are using.

Signed-off-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
---
tools/perf/builtin-record.c | 4 +-
tools/perf/util/parse-events.c | 47 +++++++++++++++++++----
tools/perf/util/parse-events.h | 13 ++++++-
tools/perf/util/trace-event-info.c | 72 +++++++++++++++++++++++++++++------
tools/perf/util/trace-event-parse.c | 1 +
tools/perf/util/trace-event-read.c | 1 +
tools/perf/util/trace-event.h | 9 ++--
7 files changed, 120 insertions(+), 27 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index acbe594..add514d 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -549,11 +549,11 @@ static int __cmd_record(int argc, const char **argv)


if (raw_samples) {
- read_tracing_data();
+ read_tracing_data(attrs, nr_counters);
} else {
for (i = 0; i < nr_counters; i++) {
if (attrs[i].sample_type & PERF_SAMPLE_RAW) {
- read_tracing_data();
+ read_tracing_data(attrs, nr_counters);
break;
}
}
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 967d17f..8c20239 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -158,9 +158,9 @@ int valid_debugfs_mount(const char *debugfs)
return 0;
}

-static const char *tracepoint_id_to_name(u64 config)
+struct tracepoint_path *tracepoint_id_to_path(u64 config)
{
- static char tracepoint_name[2 * MAX_EVENT_LENGTH];
+ struct tracepoint_path *path = NULL;
DIR *sys_dir, *evt_dir;
struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
struct stat st;
@@ -170,7 +170,7 @@ static const char *tracepoint_id_to_name(u64 config)
char evt_path[MAXPATHLEN];

if (valid_debugfs_mount(debugfs_path))
- return "unkown";
+ return NULL;

sys_dir = opendir(debugfs_path);
if (!sys_dir)
@@ -197,10 +197,23 @@ static const char *tracepoint_id_to_name(u64 config)
if (id == config) {
closedir(evt_dir);
closedir(sys_dir);
- snprintf(tracepoint_name, 2 * MAX_EVENT_LENGTH,
- "%s:%s", sys_dirent.d_name,
- evt_dirent.d_name);
- return tracepoint_name;
+ path = calloc(1, sizeof(path));
+ path->system = malloc(MAX_EVENT_LENGTH);
+ if (!path->system) {
+ free(path);
+ return NULL;
+ }
+ path->name = malloc(MAX_EVENT_LENGTH);
+ if (!path->name) {
+ free(path->system);
+ free(path);
+ return NULL;
+ }
+ strncpy(path->system, sys_dirent.d_name,
+ MAX_EVENT_LENGTH);
+ strncpy(path->name, evt_dirent.d_name,
+ MAX_EVENT_LENGTH);
+ return path;
}
}
closedir(evt_dir);
@@ -208,7 +221,25 @@ static const char *tracepoint_id_to_name(u64 config)

cleanup:
closedir(sys_dir);
- return "unkown";
+ return NULL;
+}
+
+#define TP_PATH_LEN (MAX_EVENT_LENGTH * 2 + 1)
+static const char *tracepoint_id_to_name(u64 config)
+{
+ static char buf[TP_PATH_LEN];
+ struct tracepoint_path *path;
+
+ path = tracepoint_id_to_path(config);
+ if (path) {
+ snprintf(buf, TP_PATH_LEN, "%s:%s", path->system, path->name);
+ free(path->name);
+ free(path->system);
+ free(path);
+ } else
+ snprintf(buf, TP_PATH_LEN, "%s:%s", "unknown", "unknown");
+
+ return buf;
}

static int is_cache_op_valid(u8 cache_type, u8 cache_op)
diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
index 9b1aeea..60704c1 100644
--- a/tools/perf/util/parse-events.h
+++ b/tools/perf/util/parse-events.h
@@ -1,10 +1,19 @@
-
+#ifndef _PARSE_EVENTS_H
+#define _PARSE_EVENTS_H
/*
* Parse symbolic events/counts passed in as options:
*/

struct option;

+struct tracepoint_path {
+ char *system;
+ char *name;
+ struct tracepoint_path *next;
+};
+
+extern struct tracepoint_path *tracepoint_id_to_path(u64 config);
+
extern int nr_counters;

extern struct perf_counter_attr attrs[MAX_COUNTERS];
@@ -21,3 +30,5 @@ extern void print_events(void);
extern char debugfs_path[];
extern int valid_debugfs_mount(const char *debugfs);

+
+#endif /* _PARSE_EVENTS_H */
diff --git a/tools/perf/util/trace-event-info.c b/tools/perf/util/trace-event-info.c
index 78adff1..8161527 100644
--- a/tools/perf/util/trace-event-info.c
+++ b/tools/perf/util/trace-event-info.c
@@ -32,7 +32,9 @@
#include <unistd.h>
#include <ctype.h>
#include <errno.h>
+#include <stdbool.h>

+#include "../perf.h"
#include "trace-event.h"


@@ -289,7 +291,18 @@ static void read_header_files(void)
put_tracing_file(path);
}

-static void copy_event_system(const char *sys)
+static bool name_in_tp_list(char *sys, struct tracepoint_path *tps)
+{
+ while (tps) {
+ if (!strcmp(sys, tps->name))
+ return true;
+ tps = tps->next;
+ }
+
+ return false;
+}
+
+static void copy_event_system(const char *sys, struct tracepoint_path *tps)
{
unsigned long long size, check_size;
struct dirent *dent;
@@ -305,7 +318,8 @@ static void copy_event_system(const char *sys)

while ((dent = readdir(dir))) {
if (strcmp(dent->d_name, ".") == 0 ||
- strcmp(dent->d_name, "..") == 0)
+ strcmp(dent->d_name, "..") == 0 ||
+ !name_in_tp_list(dent->d_name, tps))
continue;
format = malloc_or_die(strlen(sys) + strlen(dent->d_name) + 10);
sprintf(format, "%s/%s/format", sys, dent->d_name);
@@ -321,7 +335,8 @@ static void copy_event_system(const char *sys)
rewinddir(dir);
while ((dent = readdir(dir))) {
if (strcmp(dent->d_name, ".") == 0 ||
- strcmp(dent->d_name, "..") == 0)
+ strcmp(dent->d_name, "..") == 0 ||
+ !name_in_tp_list(dent->d_name, tps))
continue;
format = malloc_or_die(strlen(sys) + strlen(dent->d_name) + 10);
sprintf(format, "%s/%s/format", sys, dent->d_name);
@@ -340,18 +355,29 @@ static void copy_event_system(const char *sys)
}
}

-static void read_ftrace_files(void)
+static void read_ftrace_files(struct tracepoint_path *tps)
{
char *path;

path = get_tracing_file("events/ftrace");

- copy_event_system(path);
+ copy_event_system(path, tps);

put_tracing_file(path);
}

-static void read_event_files(void)
+static bool system_in_tp_list(char *sys, struct tracepoint_path *tps)
+{
+ while (tps) {
+ if (!strcmp(sys, tps->system))
+ return true;
+ tps = tps->next;
+ }
+
+ return false;
+}
+
+static void read_event_files(struct tracepoint_path *tps)
{
struct dirent *dent;
struct stat st;
@@ -370,7 +396,8 @@ static void read_event_files(void)
while ((dent = readdir(dir))) {
if (strcmp(dent->d_name, ".") == 0 ||
strcmp(dent->d_name, "..") == 0 ||
- strcmp(dent->d_name, "ftrace") == 0)
+ strcmp(dent->d_name, "ftrace") == 0 ||
+ !system_in_tp_list(dent->d_name, tps))
continue;
sys = malloc_or_die(strlen(path) + strlen(dent->d_name) + 2);
sprintf(sys, "%s/%s", path, dent->d_name);
@@ -388,7 +415,8 @@ static void read_event_files(void)
while ((dent = readdir(dir))) {
if (strcmp(dent->d_name, ".") == 0 ||
strcmp(dent->d_name, "..") == 0 ||
- strcmp(dent->d_name, "ftrace") == 0)
+ strcmp(dent->d_name, "ftrace") == 0 ||
+ !system_in_tp_list(dent->d_name, tps))
continue;
sys = malloc_or_die(strlen(path) + strlen(dent->d_name) + 2);
sprintf(sys, "%s/%s", path, dent->d_name);
@@ -396,7 +424,7 @@ static void read_event_files(void)
if (ret >= 0) {
if (S_ISDIR(st.st_mode)) {
write_or_die(dent->d_name, strlen(dent->d_name) + 1);
- copy_event_system(sys);
+ copy_event_system(sys, tps);
}
}
free(sys);
@@ -450,9 +478,27 @@ static void read_ftrace_printk(void)

}

-void read_tracing_data(void)
+static struct tracepoint_path *
+get_tracepoints_path(struct perf_counter_attr *pattrs, int nb_counters)
+{
+ struct tracepoint_path path, *ppath = &path;
+ int i;
+
+ for (i = 0; i < nb_counters; i++) {
+ if (pattrs[i].type != PERF_TYPE_TRACEPOINT)
+ continue;
+ ppath->next = tracepoint_id_to_path(pattrs[i].config);
+ if (!ppath->next)
+ die("%s\n", "No memory to alloc tracepoints list");
+ ppath = ppath->next;
+ }
+
+ return path.next;
+}
+void read_tracing_data(struct perf_counter_attr *pattrs, int nb_counters)
{
char buf[BUFSIZ];
+ struct tracepoint_path *tps;

output_fd = open(output_file, O_WRONLY | O_CREAT | O_TRUNC | O_LARGEFILE, 0644);
if (output_fd < 0)
@@ -483,9 +529,11 @@ void read_tracing_data(void)
page_size = getpagesize();
write_or_die(&page_size, 4);

+ tps = get_tracepoints_path(pattrs, nb_counters);
+
read_header_files();
- read_ftrace_files();
- read_event_files();
+ read_ftrace_files(tps);
+ read_event_files(tps);
read_proc_kallsyms();
read_ftrace_printk();
}
diff --git a/tools/perf/util/trace-event-parse.c b/tools/perf/util/trace-event-parse.c
index b53b27f..a6577cd 100644
--- a/tools/perf/util/trace-event-parse.c
+++ b/tools/perf/util/trace-event-parse.c
@@ -29,6 +29,7 @@
#include <errno.h>

#undef _GNU_SOURCE
+#include "../perf.h"
#include "util.h"
#include "trace-event.h"

diff --git a/tools/perf/util/trace-event-read.c b/tools/perf/util/trace-event-read.c
index 1dac301..b12e490 100644
--- a/tools/perf/util/trace-event-read.c
+++ b/tools/perf/util/trace-event-read.c
@@ -36,6 +36,7 @@
#include <ctype.h>
#include <errno.h>

+#include "../perf.h"
#include "util.h"
#include "trace-event.h"

diff --git a/tools/perf/util/trace-event.h b/tools/perf/util/trace-event.h
index 3ddb894..051fcf3 100644
--- a/tools/perf/util/trace-event.h
+++ b/tools/perf/util/trace-event.h
@@ -1,6 +1,7 @@
-#ifndef _PARSE_EVENTS_H
-#define _PARSE_EVENTS_H
+#ifndef _TRACE_EVENTS_H
+#define _TRACE_EVENTS_H

+#include "parse-events.h"

#define __unused __attribute__((unused))

@@ -233,6 +234,6 @@ extern int header_page_data_size;

int parse_header_page(char *buf, unsigned long size);

-void read_tracing_data(void);
+void read_tracing_data(struct perf_counter_attr *pattrs, int nb_counters);

-#endif /* _PARSE_EVENTS_H */
+#endif /* _TRACE_EVENTS_H */
--
1.6.2.3

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