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perf_counter: Add tracepoint support to perf list, perf stat
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Add support to 'perf list' and 'perf stat' for kernel tracepoints. The
implementation creates a 'for_each_subsystem' and 'for_each_event' for
easy iteration over the tracepoints.

Signed-off-by: Jason Baron <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
LKML-Reference: <426129bf9fcc8ee63bb094cf736e7316a7dcd77a.1248190728.git.jbaron@redhat.com>
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@jibaron
jibaron authored and Peter Zijlstra committed Jul 22, 2009
1 parent 28ac909 commit f6bdafe
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Showing 2 changed files with 176 additions and 1 deletion.
175 changes: 174 additions & 1 deletion tools/perf/util/parse-events.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,8 @@ int nr_counters;

struct perf_counter_attr attrs[MAX_COUNTERS];

static char default_debugfs_path[] = "/sys/kernel/debug/tracing/events";

struct event_symbol {
u8 type;
u64 config;
Expand Down Expand Up @@ -110,6 +112,88 @@ static unsigned long hw_cache_stat[C(MAX)] = {
[C(BPU)] = (CACHE_READ),
};

#define for_each_subsystem(sys_dir, sys_dirent, sys_next, file, st) \
while (!readdir_r(sys_dir, &sys_dirent, &sys_next) && sys_next) \
if (snprintf(file, MAXPATHLEN, "%s/%s", default_debugfs_path, \
sys_dirent.d_name) && \
(!stat(file, &st)) && (S_ISDIR(st.st_mode)) && \
(strcmp(sys_dirent.d_name, ".")) && \
(strcmp(sys_dirent.d_name, "..")))

#define for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next, file, st) \
while (!readdir_r(evt_dir, &evt_dirent, &evt_next) && evt_next) \
if (snprintf(file, MAXPATHLEN, "%s/%s/%s", default_debugfs_path, \
sys_dirent.d_name, evt_dirent.d_name) && \
(!stat(file, &st)) && (S_ISDIR(st.st_mode)) && \
(strcmp(evt_dirent.d_name, ".")) && \
(strcmp(evt_dirent.d_name, "..")))

#define MAX_EVENT_LENGTH 30

static int valid_debugfs_mount(void)
{
struct statfs st_fs;

if (statfs(default_debugfs_path, &st_fs) < 0)
return -ENOENT;
else if (st_fs.f_type != (long) DEBUGFS_MAGIC)
return -ENOENT;
return 0;
}

static char *tracepoint_id_to_name(u64 config)
{
static char tracepoint_name[2 * MAX_EVENT_LENGTH];
DIR *sys_dir, *evt_dir;
struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
struct stat st;
char id_buf[4];
int fd;
u64 id;
char evt_path[MAXPATHLEN];

if (valid_debugfs_mount())
return "unkown";

sys_dir = opendir(default_debugfs_path);
if (!sys_dir)
goto cleanup;

for_each_subsystem(sys_dir, sys_dirent, sys_next, evt_path, st) {
evt_dir = opendir(evt_path);
if (!evt_dir)
goto cleanup;
for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next,
evt_path, st) {
snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id",
default_debugfs_path, sys_dirent.d_name,
evt_dirent.d_name);
fd = open(evt_path, O_RDONLY);
if (fd < 0)
continue;
if (read(fd, id_buf, sizeof(id_buf)) < 0) {
close(fd);
continue;
}
close(fd);
id = atoll(id_buf);
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;
}
}
closedir(evt_dir);
}

cleanup:
closedir(sys_dir);
return "unkown";
}

static int is_cache_op_valid(u8 cache_type, u8 cache_op)
{
if (hw_cache_stat[cache_type] & COP(cache_op))
Expand Down Expand Up @@ -177,6 +261,9 @@ char *event_name(int counter)
return sw_event_names[config];
return "unknown-software";

case PERF_TYPE_TRACEPOINT:
return tracepoint_id_to_name(config);

default:
break;
}
Expand Down Expand Up @@ -265,6 +352,53 @@ parse_generic_hw_event(const char **str, struct perf_counter_attr *attr)
return 1;
}

static int parse_tracepoint_event(const char **strp,
struct perf_counter_attr *attr)
{
const char *evt_name;
char sys_name[MAX_EVENT_LENGTH];
char id_buf[4];
int fd;
unsigned int sys_length, evt_length;
u64 id;
char evt_path[MAXPATHLEN];

if (valid_debugfs_mount())
return 0;

evt_name = strchr(*strp, ':');
if (!evt_name)
return 0;

sys_length = evt_name - *strp;
if (sys_length >= MAX_EVENT_LENGTH)
return 0;

strncpy(sys_name, *strp, sys_length);
sys_name[sys_length] = '\0';
evt_name = evt_name + 1;
evt_length = strlen(evt_name);
if (evt_length >= MAX_EVENT_LENGTH)
return 0;

snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", default_debugfs_path,
sys_name, evt_name);
fd = open(evt_path, O_RDONLY);
if (fd < 0)
return 0;

if (read(fd, id_buf, sizeof(id_buf)) < 0) {
close(fd);
return 0;
}
close(fd);
id = atoll(id_buf);
attr->config = id;
attr->type = PERF_TYPE_TRACEPOINT;
*strp = evt_name + evt_length;
return 1;
}

static int check_events(const char *str, unsigned int i)
{
int n;
Expand Down Expand Up @@ -374,7 +508,8 @@ parse_event_modifier(const char **strp, struct perf_counter_attr *attr)
*/
static int parse_event_symbols(const char **str, struct perf_counter_attr *attr)
{
if (!(parse_raw_event(str, attr) ||
if (!(parse_tracepoint_event(str, attr) ||
parse_raw_event(str, attr) ||
parse_numeric_event(str, attr) ||
parse_symbolic_event(str, attr) ||
parse_generic_hw_event(str, attr)))
Expand Down Expand Up @@ -422,6 +557,42 @@ static const char * const event_type_descriptors[] = {
"Hardware cache event",
};

/*
* Print the events from <debugfs_mount_point>/tracing/events
*/

static void print_tracepoint_events(void)
{
DIR *sys_dir, *evt_dir;
struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
struct stat st;
char evt_path[MAXPATHLEN];

if (valid_debugfs_mount())
return;

sys_dir = opendir(default_debugfs_path);
if (!sys_dir)
goto cleanup;

for_each_subsystem(sys_dir, sys_dirent, sys_next, evt_path, st) {
evt_dir = opendir(evt_path);
if (!evt_dir)
goto cleanup;
for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next,
evt_path, st) {
snprintf(evt_path, MAXPATHLEN, "%s:%s",
sys_dirent.d_name, evt_dirent.d_name);
fprintf(stderr, " %-40s [%s]\n", evt_path,
event_type_descriptors[PERF_TYPE_TRACEPOINT+1]);
}
closedir(evt_dir);
}

cleanup:
closedir(sys_dir);
}

/*
* Print the help text for the event symbols:
*/
Expand Down Expand Up @@ -472,5 +643,7 @@ void print_events(void)
"rNNN");
fprintf(stderr, "\n");

print_tracepoint_events();

exit(129);
}
2 changes: 2 additions & 0 deletions tools/perf/util/util.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -50,6 +50,7 @@
#include <unistd.h>
#include <stdio.h>
#include <sys/stat.h>
#include <sys/statfs.h>
#include <fcntl.h>
#include <stddef.h>
#include <stdlib.h>
Expand Down Expand Up @@ -80,6 +81,7 @@
#include <netdb.h>
#include <pwd.h>
#include <inttypes.h>
#include "../../../include/linux/magic.h"

#ifndef NO_ICONV
#include <iconv.h>
Expand Down

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