perf_counter: Add tracepoint support to perf list, perf stat
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 <jbaron@redhat.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <426129bf9fcc8ee63bb094cf736e7316a7dcd77a.1248190728.git.jbaron@redhat.com>
This commit is contained in:
Jason Baron
Peter Zijlstra
parent
28ac909b49
commit
f6bdafef2a
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@ -12,6 +12,8 @@ int nr_counters;
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struct perf_counter_attr attrs[MAX_COUNTERS];
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static char default_debugfs_path[] = "/sys/kernel/debug/tracing/events";
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struct event_symbol {
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u8 type;
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u64 config;
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@ -110,6 +112,88 @@ static unsigned long hw_cache_stat[C(MAX)] = {
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[C(BPU)] = (CACHE_READ),
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};
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#define for_each_subsystem(sys_dir, sys_dirent, sys_next, file, st) \
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while (!readdir_r(sys_dir, &sys_dirent, &sys_next) && sys_next) \
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if (snprintf(file, MAXPATHLEN, "%s/%s", default_debugfs_path, \
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sys_dirent.d_name) && \
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(!stat(file, &st)) && (S_ISDIR(st.st_mode)) && \
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(strcmp(sys_dirent.d_name, ".")) && \
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(strcmp(sys_dirent.d_name, "..")))
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#define for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next, file, st) \
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while (!readdir_r(evt_dir, &evt_dirent, &evt_next) && evt_next) \
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if (snprintf(file, MAXPATHLEN, "%s/%s/%s", default_debugfs_path, \
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sys_dirent.d_name, evt_dirent.d_name) && \
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(!stat(file, &st)) && (S_ISDIR(st.st_mode)) && \
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(strcmp(evt_dirent.d_name, ".")) && \
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(strcmp(evt_dirent.d_name, "..")))
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#define MAX_EVENT_LENGTH 30
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static int valid_debugfs_mount(void)
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{
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struct statfs st_fs;
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if (statfs(default_debugfs_path, &st_fs) < 0)
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return -ENOENT;
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else if (st_fs.f_type != (long) DEBUGFS_MAGIC)
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return -ENOENT;
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return 0;
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}
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static char *tracepoint_id_to_name(u64 config)
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{
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static char tracepoint_name[2 * MAX_EVENT_LENGTH];
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DIR *sys_dir, *evt_dir;
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struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
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struct stat st;
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char id_buf[4];
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int fd;
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u64 id;
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char evt_path[MAXPATHLEN];
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if (valid_debugfs_mount())
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return "unkown";
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sys_dir = opendir(default_debugfs_path);
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if (!sys_dir)
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goto cleanup;
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for_each_subsystem(sys_dir, sys_dirent, sys_next, evt_path, st) {
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evt_dir = opendir(evt_path);
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if (!evt_dir)
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goto cleanup;
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for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next,
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evt_path, st) {
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snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id",
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default_debugfs_path, sys_dirent.d_name,
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evt_dirent.d_name);
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fd = open(evt_path, O_RDONLY);
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if (fd < 0)
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continue;
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if (read(fd, id_buf, sizeof(id_buf)) < 0) {
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close(fd);
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continue;
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}
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close(fd);
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id = atoll(id_buf);
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if (id == config) {
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closedir(evt_dir);
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closedir(sys_dir);
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snprintf(tracepoint_name, 2 * MAX_EVENT_LENGTH,
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"%s:%s", sys_dirent.d_name,
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evt_dirent.d_name);
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return tracepoint_name;
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}
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}
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closedir(evt_dir);
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}
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cleanup:
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closedir(sys_dir);
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return "unkown";
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}
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static int is_cache_op_valid(u8 cache_type, u8 cache_op)
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{
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if (hw_cache_stat[cache_type] & COP(cache_op))
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@ -177,6 +261,9 @@ char *event_name(int counter)
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return sw_event_names[config];
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return "unknown-software";
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case PERF_TYPE_TRACEPOINT:
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return tracepoint_id_to_name(config);
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default:
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break;
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}
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@ -265,6 +352,53 @@ parse_generic_hw_event(const char **str, struct perf_counter_attr *attr)
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return 1;
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}
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static int parse_tracepoint_event(const char **strp,
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struct perf_counter_attr *attr)
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{
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const char *evt_name;
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char sys_name[MAX_EVENT_LENGTH];
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char id_buf[4];
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int fd;
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unsigned int sys_length, evt_length;
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u64 id;
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char evt_path[MAXPATHLEN];
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if (valid_debugfs_mount())
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return 0;
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evt_name = strchr(*strp, ':');
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if (!evt_name)
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return 0;
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sys_length = evt_name - *strp;
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if (sys_length >= MAX_EVENT_LENGTH)
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return 0;
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strncpy(sys_name, *strp, sys_length);
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sys_name[sys_length] = '\0';
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evt_name = evt_name + 1;
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evt_length = strlen(evt_name);
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if (evt_length >= MAX_EVENT_LENGTH)
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return 0;
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snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", default_debugfs_path,
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sys_name, evt_name);
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fd = open(evt_path, O_RDONLY);
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if (fd < 0)
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return 0;
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if (read(fd, id_buf, sizeof(id_buf)) < 0) {
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close(fd);
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return 0;
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}
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close(fd);
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id = atoll(id_buf);
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attr->config = id;
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attr->type = PERF_TYPE_TRACEPOINT;
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*strp = evt_name + evt_length;
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return 1;
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}
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static int check_events(const char *str, unsigned int i)
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{
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int n;
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@ -374,7 +508,8 @@ parse_event_modifier(const char **strp, struct perf_counter_attr *attr)
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*/
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static int parse_event_symbols(const char **str, struct perf_counter_attr *attr)
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{
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if (!(parse_raw_event(str, attr) ||
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if (!(parse_tracepoint_event(str, attr) ||
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parse_raw_event(str, attr) ||
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parse_numeric_event(str, attr) ||
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parse_symbolic_event(str, attr) ||
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parse_generic_hw_event(str, attr)))
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@ -422,6 +557,42 @@ static const char * const event_type_descriptors[] = {
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"Hardware cache event",
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};
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/*
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* Print the events from <debugfs_mount_point>/tracing/events
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*/
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static void print_tracepoint_events(void)
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{
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DIR *sys_dir, *evt_dir;
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struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
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struct stat st;
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char evt_path[MAXPATHLEN];
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if (valid_debugfs_mount())
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return;
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sys_dir = opendir(default_debugfs_path);
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if (!sys_dir)
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goto cleanup;
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for_each_subsystem(sys_dir, sys_dirent, sys_next, evt_path, st) {
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evt_dir = opendir(evt_path);
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if (!evt_dir)
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goto cleanup;
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for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next,
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evt_path, st) {
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snprintf(evt_path, MAXPATHLEN, "%s:%s",
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sys_dirent.d_name, evt_dirent.d_name);
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fprintf(stderr, " %-40s [%s]\n", evt_path,
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event_type_descriptors[PERF_TYPE_TRACEPOINT+1]);
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}
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closedir(evt_dir);
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}
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cleanup:
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closedir(sys_dir);
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}
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/*
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* Print the help text for the event symbols:
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*/
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@ -472,5 +643,7 @@ void print_events(void)
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"rNNN");
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fprintf(stderr, "\n");
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print_tracepoint_events();
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exit(129);
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}
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@ -50,6 +50,7 @@
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#include <unistd.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#include <sys/statfs.h>
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#include <fcntl.h>
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#include <stddef.h>
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#include <stdlib.h>
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@ -80,6 +81,7 @@
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#include <netdb.h>
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#include <pwd.h>
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#include <inttypes.h>
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#include "../../../include/linux/magic.h"
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#ifndef NO_ICONV
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#include <iconv.h>
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