linux/tools/perf/util/parse-events.c
Frederic Weisbecker 1ef2ed1066 perf tools: Only save the event formats we need
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@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <1251421798-9101-1-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-28 07:58:11 +02:00

714 lines
16 KiB
C

#include "../perf.h"
#include "util.h"
#include "parse-options.h"
#include "parse-events.h"
#include "exec_cmd.h"
#include "string.h"
#include "cache.h"
extern char *strcasestr(const char *haystack, const char *needle);
int nr_counters;
struct perf_counter_attr attrs[MAX_COUNTERS];
struct event_symbol {
u8 type;
u64 config;
const char *symbol;
const char *alias;
};
char debugfs_path[MAXPATHLEN];
#define CHW(x) .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_##x
#define CSW(x) .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_##x
static struct event_symbol event_symbols[] = {
{ CHW(CPU_CYCLES), "cpu-cycles", "cycles" },
{ CHW(INSTRUCTIONS), "instructions", "" },
{ CHW(CACHE_REFERENCES), "cache-references", "" },
{ CHW(CACHE_MISSES), "cache-misses", "" },
{ CHW(BRANCH_INSTRUCTIONS), "branch-instructions", "branches" },
{ CHW(BRANCH_MISSES), "branch-misses", "" },
{ CHW(BUS_CYCLES), "bus-cycles", "" },
{ CSW(CPU_CLOCK), "cpu-clock", "" },
{ CSW(TASK_CLOCK), "task-clock", "" },
{ CSW(PAGE_FAULTS), "page-faults", "faults" },
{ CSW(PAGE_FAULTS_MIN), "minor-faults", "" },
{ CSW(PAGE_FAULTS_MAJ), "major-faults", "" },
{ CSW(CONTEXT_SWITCHES), "context-switches", "cs" },
{ CSW(CPU_MIGRATIONS), "cpu-migrations", "migrations" },
};
#define __PERF_COUNTER_FIELD(config, name) \
((config & PERF_COUNTER_##name##_MASK) >> PERF_COUNTER_##name##_SHIFT)
#define PERF_COUNTER_RAW(config) __PERF_COUNTER_FIELD(config, RAW)
#define PERF_COUNTER_CONFIG(config) __PERF_COUNTER_FIELD(config, CONFIG)
#define PERF_COUNTER_TYPE(config) __PERF_COUNTER_FIELD(config, TYPE)
#define PERF_COUNTER_ID(config) __PERF_COUNTER_FIELD(config, EVENT)
static const char *hw_event_names[] = {
"cycles",
"instructions",
"cache-references",
"cache-misses",
"branches",
"branch-misses",
"bus-cycles",
};
static const char *sw_event_names[] = {
"cpu-clock-msecs",
"task-clock-msecs",
"page-faults",
"context-switches",
"CPU-migrations",
"minor-faults",
"major-faults",
};
#define MAX_ALIASES 8
static const char *hw_cache[][MAX_ALIASES] = {
{ "L1-dcache", "l1-d", "l1d", "L1-data", },
{ "L1-icache", "l1-i", "l1i", "L1-instruction", },
{ "LLC", "L2" },
{ "dTLB", "d-tlb", "Data-TLB", },
{ "iTLB", "i-tlb", "Instruction-TLB", },
{ "branch", "branches", "bpu", "btb", "bpc", },
};
static const char *hw_cache_op[][MAX_ALIASES] = {
{ "load", "loads", "read", },
{ "store", "stores", "write", },
{ "prefetch", "prefetches", "speculative-read", "speculative-load", },
};
static const char *hw_cache_result[][MAX_ALIASES] = {
{ "refs", "Reference", "ops", "access", },
{ "misses", "miss", },
};
#define C(x) PERF_COUNT_HW_CACHE_##x
#define CACHE_READ (1 << C(OP_READ))
#define CACHE_WRITE (1 << C(OP_WRITE))
#define CACHE_PREFETCH (1 << C(OP_PREFETCH))
#define COP(x) (1 << x)
/*
* cache operartion stat
* L1I : Read and prefetch only
* ITLB and BPU : Read-only
*/
static unsigned long hw_cache_stat[C(MAX)] = {
[C(L1D)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
[C(L1I)] = (CACHE_READ | CACHE_PREFETCH),
[C(LL)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
[C(DTLB)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
[C(ITLB)] = (CACHE_READ),
[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", debugfs_path, \
sys_dirent.d_name) && \
(!stat(file, &st)) && (S_ISDIR(st.st_mode)) && \
(strcmp(sys_dirent.d_name, ".")) && \
(strcmp(sys_dirent.d_name, "..")))
static int tp_event_has_id(struct dirent *sys_dir, struct dirent *evt_dir)
{
char evt_path[MAXPATHLEN];
int fd;
snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", debugfs_path,
sys_dir->d_name, evt_dir->d_name);
fd = open(evt_path, O_RDONLY);
if (fd < 0)
return -EINVAL;
close(fd);
return 0;
}
#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", 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, "..")) && \
(!tp_event_has_id(&sys_dirent, &evt_dirent)))
#define MAX_EVENT_LENGTH 30
int valid_debugfs_mount(const char *debugfs)
{
struct statfs st_fs;
if (statfs(debugfs, &st_fs) < 0)
return -ENOENT;
else if (st_fs.f_type != (long) DEBUGFS_MAGIC)
return -ENOENT;
return 0;
}
struct tracepoint_path *tracepoint_id_to_path(u64 config)
{
struct tracepoint_path *path = NULL;
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(debugfs_path))
return NULL;
sys_dir = opendir(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",
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);
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);
}
cleanup:
closedir(sys_dir);
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)
{
if (hw_cache_stat[cache_type] & COP(cache_op))
return 1; /* valid */
else
return 0; /* invalid */
}
static char *event_cache_name(u8 cache_type, u8 cache_op, u8 cache_result)
{
static char name[50];
if (cache_result) {
sprintf(name, "%s-%s-%s", hw_cache[cache_type][0],
hw_cache_op[cache_op][0],
hw_cache_result[cache_result][0]);
} else {
sprintf(name, "%s-%s", hw_cache[cache_type][0],
hw_cache_op[cache_op][1]);
}
return name;
}
const char *event_name(int counter)
{
u64 config = attrs[counter].config;
int type = attrs[counter].type;
return __event_name(type, config);
}
const char *__event_name(int type, u64 config)
{
static char buf[32];
if (type == PERF_TYPE_RAW) {
sprintf(buf, "raw 0x%llx", config);
return buf;
}
switch (type) {
case PERF_TYPE_HARDWARE:
if (config < PERF_COUNT_HW_MAX)
return hw_event_names[config];
return "unknown-hardware";
case PERF_TYPE_HW_CACHE: {
u8 cache_type, cache_op, cache_result;
cache_type = (config >> 0) & 0xff;
if (cache_type > PERF_COUNT_HW_CACHE_MAX)
return "unknown-ext-hardware-cache-type";
cache_op = (config >> 8) & 0xff;
if (cache_op > PERF_COUNT_HW_CACHE_OP_MAX)
return "unknown-ext-hardware-cache-op";
cache_result = (config >> 16) & 0xff;
if (cache_result > PERF_COUNT_HW_CACHE_RESULT_MAX)
return "unknown-ext-hardware-cache-result";
if (!is_cache_op_valid(cache_type, cache_op))
return "invalid-cache";
return event_cache_name(cache_type, cache_op, cache_result);
}
case PERF_TYPE_SOFTWARE:
if (config < PERF_COUNT_SW_MAX)
return sw_event_names[config];
return "unknown-software";
case PERF_TYPE_TRACEPOINT:
return tracepoint_id_to_name(config);
default:
break;
}
return "unknown";
}
static int parse_aliases(const char **str, const char *names[][MAX_ALIASES], int size)
{
int i, j;
int n, longest = -1;
for (i = 0; i < size; i++) {
for (j = 0; j < MAX_ALIASES && names[i][j]; j++) {
n = strlen(names[i][j]);
if (n > longest && !strncasecmp(*str, names[i][j], n))
longest = n;
}
if (longest > 0) {
*str += longest;
return i;
}
}
return -1;
}
static int
parse_generic_hw_event(const char **str, struct perf_counter_attr *attr)
{
const char *s = *str;
int cache_type = -1, cache_op = -1, cache_result = -1;
cache_type = parse_aliases(&s, hw_cache, PERF_COUNT_HW_CACHE_MAX);
/*
* No fallback - if we cannot get a clear cache type
* then bail out:
*/
if (cache_type == -1)
return 0;
while ((cache_op == -1 || cache_result == -1) && *s == '-') {
++s;
if (cache_op == -1) {
cache_op = parse_aliases(&s, hw_cache_op,
PERF_COUNT_HW_CACHE_OP_MAX);
if (cache_op >= 0) {
if (!is_cache_op_valid(cache_type, cache_op))
return 0;
continue;
}
}
if (cache_result == -1) {
cache_result = parse_aliases(&s, hw_cache_result,
PERF_COUNT_HW_CACHE_RESULT_MAX);
if (cache_result >= 0)
continue;
}
/*
* Can't parse this as a cache op or result, so back up
* to the '-'.
*/
--s;
break;
}
/*
* Fall back to reads:
*/
if (cache_op == -1)
cache_op = PERF_COUNT_HW_CACHE_OP_READ;
/*
* Fall back to accesses:
*/
if (cache_result == -1)
cache_result = PERF_COUNT_HW_CACHE_RESULT_ACCESS;
attr->config = cache_type | (cache_op << 8) | (cache_result << 16);
attr->type = PERF_TYPE_HW_CACHE;
*str = s;
return 1;
}
static int parse_tracepoint_event(const char **strp,
struct perf_counter_attr *attr)
{
const char *evt_name;
char *flags;
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(debugfs_path))
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;
flags = strchr(evt_name, ':');
if (flags) {
*flags = '\0';
flags++;
if (!strncmp(flags, "record", strlen(flags)))
attr->sample_type |= PERF_SAMPLE_RAW;
}
evt_length = strlen(evt_name);
if (evt_length >= MAX_EVENT_LENGTH)
return 0;
snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", 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;
n = strlen(event_symbols[i].symbol);
if (!strncmp(str, event_symbols[i].symbol, n))
return n;
n = strlen(event_symbols[i].alias);
if (n)
if (!strncmp(str, event_symbols[i].alias, n))
return n;
return 0;
}
static int
parse_symbolic_event(const char **strp, struct perf_counter_attr *attr)
{
const char *str = *strp;
unsigned int i;
int n;
for (i = 0; i < ARRAY_SIZE(event_symbols); i++) {
n = check_events(str, i);
if (n > 0) {
attr->type = event_symbols[i].type;
attr->config = event_symbols[i].config;
*strp = str + n;
return 1;
}
}
return 0;
}
static int parse_raw_event(const char **strp, struct perf_counter_attr *attr)
{
const char *str = *strp;
u64 config;
int n;
if (*str != 'r')
return 0;
n = hex2u64(str + 1, &config);
if (n > 0) {
*strp = str + n + 1;
attr->type = PERF_TYPE_RAW;
attr->config = config;
return 1;
}
return 0;
}
static int
parse_numeric_event(const char **strp, struct perf_counter_attr *attr)
{
const char *str = *strp;
char *endp;
unsigned long type;
u64 config;
type = strtoul(str, &endp, 0);
if (endp > str && type < PERF_TYPE_MAX && *endp == ':') {
str = endp + 1;
config = strtoul(str, &endp, 0);
if (endp > str) {
attr->type = type;
attr->config = config;
*strp = endp;
return 1;
}
}
return 0;
}
static int
parse_event_modifier(const char **strp, struct perf_counter_attr *attr)
{
const char *str = *strp;
int eu = 1, ek = 1, eh = 1;
if (*str++ != ':')
return 0;
while (*str) {
if (*str == 'u')
eu = 0;
else if (*str == 'k')
ek = 0;
else if (*str == 'h')
eh = 0;
else
break;
++str;
}
if (str >= *strp + 2) {
*strp = str;
attr->exclude_user = eu;
attr->exclude_kernel = ek;
attr->exclude_hv = eh;
return 1;
}
return 0;
}
/*
* Each event can have multiple symbolic names.
* Symbolic names are (almost) exactly matched.
*/
static int parse_event_symbols(const char **str, struct perf_counter_attr *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)))
return 0;
parse_event_modifier(str, attr);
return 1;
}
int parse_events(const struct option *opt __used, const char *str, int unset __used)
{
struct perf_counter_attr attr;
for (;;) {
if (nr_counters == MAX_COUNTERS)
return -1;
memset(&attr, 0, sizeof(attr));
if (!parse_event_symbols(&str, &attr))
return -1;
if (!(*str == 0 || *str == ',' || isspace(*str)))
return -1;
attrs[nr_counters] = attr;
nr_counters++;
if (*str == 0)
break;
if (*str == ',')
++str;
while (isspace(*str))
++str;
}
return 0;
}
static const char * const event_type_descriptors[] = {
"",
"Hardware event",
"Software event",
"Tracepoint event",
"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(debugfs_path))
return;
sys_dir = opendir(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:
*/
void print_events(void)
{
struct event_symbol *syms = event_symbols;
unsigned int i, type, op, prev_type = -1;
char name[40];
fprintf(stderr, "\n");
fprintf(stderr, "List of pre-defined events (to be used in -e):\n");
for (i = 0; i < ARRAY_SIZE(event_symbols); i++, syms++) {
type = syms->type + 1;
if (type >= ARRAY_SIZE(event_type_descriptors))
type = 0;
if (type != prev_type)
fprintf(stderr, "\n");
if (strlen(syms->alias))
sprintf(name, "%s OR %s", syms->symbol, syms->alias);
else
strcpy(name, syms->symbol);
fprintf(stderr, " %-40s [%s]\n", name,
event_type_descriptors[type]);
prev_type = type;
}
fprintf(stderr, "\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++) {
fprintf(stderr, " %-40s [%s]\n",
event_cache_name(type, op, i),
event_type_descriptors[4]);
}
}
}
fprintf(stderr, "\n");
fprintf(stderr, " %-40s [raw hardware event descriptor]\n",
"rNNN");
fprintf(stderr, "\n");
print_tracepoint_events();
exit(129);
}