![Ian Munsie](/assets/img/avatar_default.png)
If we are running the new perf on an old kernel without support for sample_id_all, we should fall back to the old unordered processing of events. If we didn't than we would *always* process events without timestamps out of order, whether or not we hit a reordering race. In other words, instead of there being a chance of not attributing samples correctly, we would guarantee that samples would not be attributed. While processing all events without timestamps before events with timestamps may seem like an intuitive solution, it falls down as PERF_RECORD_EXIT events would also be processed before any samples. Even with a workaround for that case, samples before/after an exec would not be attributed correctly. This patch allows commands to indicate whether they need to fall back to unordered processing, so that commands that do not care about timestamps on every event will not be affected. If we do fallback, this will print out a warning if report -D was invoked. This patch adds the test in perf_session__new so that we only need to test once per session. Commands that do not use an event_ops (such as record and top) can simply pass NULL in it's place. Acked-by: Thomas Gleixner <tglx@linutronix.de> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> LKML-Reference: <1291951882-sup-6069@au1.ibm.com> Signed-off-by: Ian Munsie <imunsie@au1.ibm.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
834 lines
18 KiB
C
834 lines
18 KiB
C
#include "builtin.h"
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#include "perf.h"
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#include "util/cache.h"
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#include "util/debug.h"
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#include "util/exec_cmd.h"
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#include "util/header.h"
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#include "util/parse-options.h"
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#include "util/session.h"
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#include "util/symbol.h"
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#include "util/thread.h"
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#include "util/trace-event.h"
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#include "util/parse-options.h"
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#include "util/util.h"
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static char const *script_name;
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static char const *generate_script_lang;
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static bool debug_mode;
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static u64 last_timestamp;
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static u64 nr_unordered;
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extern const struct option record_options[];
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static int default_start_script(const char *script __unused,
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int argc __unused,
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const char **argv __unused)
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{
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return 0;
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}
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static int default_stop_script(void)
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{
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return 0;
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}
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static int default_generate_script(const char *outfile __unused)
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{
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return 0;
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}
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static struct scripting_ops default_scripting_ops = {
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.start_script = default_start_script,
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.stop_script = default_stop_script,
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.process_event = print_event,
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.generate_script = default_generate_script,
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};
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static struct scripting_ops *scripting_ops;
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static void setup_scripting(void)
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{
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setup_perl_scripting();
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setup_python_scripting();
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scripting_ops = &default_scripting_ops;
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}
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static int cleanup_scripting(void)
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{
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pr_debug("\nperf script stopped\n");
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return scripting_ops->stop_script();
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}
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static char const *input_name = "perf.data";
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static int process_sample_event(event_t *event, struct sample_data *sample,
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struct perf_session *session)
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{
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struct thread *thread = perf_session__findnew(session, event->ip.pid);
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if (thread == NULL) {
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pr_debug("problem processing %d event, skipping it.\n",
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event->header.type);
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return -1;
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}
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if (session->sample_type & PERF_SAMPLE_RAW) {
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if (debug_mode) {
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if (sample->time < last_timestamp) {
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pr_err("Samples misordered, previous: %llu "
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"this: %llu\n", last_timestamp,
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sample->time);
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nr_unordered++;
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}
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last_timestamp = sample->time;
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return 0;
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}
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/*
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* FIXME: better resolve from pid from the struct trace_entry
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* field, although it should be the same than this perf
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* event pid
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*/
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scripting_ops->process_event(sample->cpu, sample->raw_data,
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sample->raw_size,
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sample->time, thread->comm);
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}
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session->hists.stats.total_period += sample->period;
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return 0;
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}
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static u64 nr_lost;
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static int process_lost_event(event_t *event, struct sample_data *sample __used,
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struct perf_session *session __used)
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{
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nr_lost += event->lost.lost;
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return 0;
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}
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static struct perf_event_ops event_ops = {
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.sample = process_sample_event,
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.comm = event__process_comm,
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.attr = event__process_attr,
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.event_type = event__process_event_type,
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.tracing_data = event__process_tracing_data,
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.build_id = event__process_build_id,
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.lost = process_lost_event,
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.ordered_samples = true,
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};
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extern volatile int session_done;
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static void sig_handler(int sig __unused)
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{
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session_done = 1;
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}
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static int __cmd_script(struct perf_session *session)
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{
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int ret;
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signal(SIGINT, sig_handler);
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ret = perf_session__process_events(session, &event_ops);
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if (debug_mode) {
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pr_err("Misordered timestamps: %llu\n", nr_unordered);
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pr_err("Lost events: %llu\n", nr_lost);
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}
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return ret;
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}
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struct script_spec {
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struct list_head node;
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struct scripting_ops *ops;
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char spec[0];
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};
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LIST_HEAD(script_specs);
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static struct script_spec *script_spec__new(const char *spec,
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struct scripting_ops *ops)
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{
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struct script_spec *s = malloc(sizeof(*s) + strlen(spec) + 1);
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if (s != NULL) {
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strcpy(s->spec, spec);
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s->ops = ops;
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}
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return s;
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}
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static void script_spec__delete(struct script_spec *s)
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{
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free(s->spec);
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free(s);
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}
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static void script_spec__add(struct script_spec *s)
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{
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list_add_tail(&s->node, &script_specs);
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}
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static struct script_spec *script_spec__find(const char *spec)
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{
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struct script_spec *s;
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list_for_each_entry(s, &script_specs, node)
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if (strcasecmp(s->spec, spec) == 0)
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return s;
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return NULL;
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}
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static struct script_spec *script_spec__findnew(const char *spec,
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struct scripting_ops *ops)
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{
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struct script_spec *s = script_spec__find(spec);
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if (s)
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return s;
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s = script_spec__new(spec, ops);
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if (!s)
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goto out_delete_spec;
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script_spec__add(s);
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return s;
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out_delete_spec:
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script_spec__delete(s);
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return NULL;
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}
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int script_spec_register(const char *spec, struct scripting_ops *ops)
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{
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struct script_spec *s;
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s = script_spec__find(spec);
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if (s)
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return -1;
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s = script_spec__findnew(spec, ops);
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if (!s)
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return -1;
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return 0;
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}
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static struct scripting_ops *script_spec__lookup(const char *spec)
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{
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struct script_spec *s = script_spec__find(spec);
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if (!s)
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return NULL;
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return s->ops;
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}
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static void list_available_languages(void)
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{
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struct script_spec *s;
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fprintf(stderr, "\n");
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fprintf(stderr, "Scripting language extensions (used in "
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"perf script -s [spec:]script.[spec]):\n\n");
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list_for_each_entry(s, &script_specs, node)
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fprintf(stderr, " %-42s [%s]\n", s->spec, s->ops->name);
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fprintf(stderr, "\n");
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}
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static int parse_scriptname(const struct option *opt __used,
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const char *str, int unset __used)
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{
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char spec[PATH_MAX];
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const char *script, *ext;
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int len;
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if (strcmp(str, "lang") == 0) {
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list_available_languages();
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exit(0);
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}
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script = strchr(str, ':');
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if (script) {
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len = script - str;
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if (len >= PATH_MAX) {
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fprintf(stderr, "invalid language specifier");
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return -1;
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}
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strncpy(spec, str, len);
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spec[len] = '\0';
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scripting_ops = script_spec__lookup(spec);
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if (!scripting_ops) {
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fprintf(stderr, "invalid language specifier");
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return -1;
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}
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script++;
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} else {
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script = str;
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ext = strrchr(script, '.');
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if (!ext) {
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fprintf(stderr, "invalid script extension");
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return -1;
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}
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scripting_ops = script_spec__lookup(++ext);
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if (!scripting_ops) {
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fprintf(stderr, "invalid script extension");
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return -1;
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}
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}
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script_name = strdup(script);
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return 0;
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}
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/* Helper function for filesystems that return a dent->d_type DT_UNKNOWN */
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static int is_directory(const char *base_path, const struct dirent *dent)
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{
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char path[PATH_MAX];
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struct stat st;
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sprintf(path, "%s/%s", base_path, dent->d_name);
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if (stat(path, &st))
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return 0;
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return S_ISDIR(st.st_mode);
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}
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#define for_each_lang(scripts_path, scripts_dir, lang_dirent, lang_next)\
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while (!readdir_r(scripts_dir, &lang_dirent, &lang_next) && \
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lang_next) \
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if ((lang_dirent.d_type == DT_DIR || \
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(lang_dirent.d_type == DT_UNKNOWN && \
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is_directory(scripts_path, &lang_dirent))) && \
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(strcmp(lang_dirent.d_name, ".")) && \
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(strcmp(lang_dirent.d_name, "..")))
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#define for_each_script(lang_path, lang_dir, script_dirent, script_next)\
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while (!readdir_r(lang_dir, &script_dirent, &script_next) && \
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script_next) \
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if (script_dirent.d_type != DT_DIR && \
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(script_dirent.d_type != DT_UNKNOWN || \
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!is_directory(lang_path, &script_dirent)))
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#define RECORD_SUFFIX "-record"
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#define REPORT_SUFFIX "-report"
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struct script_desc {
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struct list_head node;
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char *name;
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char *half_liner;
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char *args;
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};
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LIST_HEAD(script_descs);
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static struct script_desc *script_desc__new(const char *name)
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{
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struct script_desc *s = zalloc(sizeof(*s));
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if (s != NULL && name)
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s->name = strdup(name);
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return s;
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}
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static void script_desc__delete(struct script_desc *s)
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{
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free(s->name);
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free(s->half_liner);
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free(s->args);
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free(s);
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}
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static void script_desc__add(struct script_desc *s)
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{
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list_add_tail(&s->node, &script_descs);
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}
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static struct script_desc *script_desc__find(const char *name)
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{
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struct script_desc *s;
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list_for_each_entry(s, &script_descs, node)
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if (strcasecmp(s->name, name) == 0)
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return s;
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return NULL;
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}
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static struct script_desc *script_desc__findnew(const char *name)
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{
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struct script_desc *s = script_desc__find(name);
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if (s)
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return s;
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s = script_desc__new(name);
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if (!s)
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goto out_delete_desc;
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script_desc__add(s);
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return s;
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out_delete_desc:
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script_desc__delete(s);
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return NULL;
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}
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static const char *ends_with(const char *str, const char *suffix)
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{
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size_t suffix_len = strlen(suffix);
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const char *p = str;
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if (strlen(str) > suffix_len) {
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p = str + strlen(str) - suffix_len;
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if (!strncmp(p, suffix, suffix_len))
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return p;
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}
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return NULL;
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}
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static char *ltrim(char *str)
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{
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int len = strlen(str);
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while (len && isspace(*str)) {
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len--;
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str++;
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}
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return str;
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}
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static int read_script_info(struct script_desc *desc, const char *filename)
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{
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char line[BUFSIZ], *p;
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FILE *fp;
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fp = fopen(filename, "r");
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if (!fp)
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return -1;
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while (fgets(line, sizeof(line), fp)) {
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p = ltrim(line);
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if (strlen(p) == 0)
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continue;
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if (*p != '#')
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continue;
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p++;
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if (strlen(p) && *p == '!')
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continue;
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p = ltrim(p);
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if (strlen(p) && p[strlen(p) - 1] == '\n')
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p[strlen(p) - 1] = '\0';
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if (!strncmp(p, "description:", strlen("description:"))) {
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p += strlen("description:");
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desc->half_liner = strdup(ltrim(p));
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continue;
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}
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if (!strncmp(p, "args:", strlen("args:"))) {
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p += strlen("args:");
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desc->args = strdup(ltrim(p));
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continue;
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}
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}
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fclose(fp);
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return 0;
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}
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static int list_available_scripts(const struct option *opt __used,
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const char *s __used, int unset __used)
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{
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struct dirent *script_next, *lang_next, script_dirent, lang_dirent;
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char scripts_path[MAXPATHLEN];
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DIR *scripts_dir, *lang_dir;
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char script_path[MAXPATHLEN];
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char lang_path[MAXPATHLEN];
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struct script_desc *desc;
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char first_half[BUFSIZ];
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char *script_root;
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char *str;
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snprintf(scripts_path, MAXPATHLEN, "%s/scripts", perf_exec_path());
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scripts_dir = opendir(scripts_path);
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if (!scripts_dir)
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return -1;
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for_each_lang(scripts_path, scripts_dir, lang_dirent, lang_next) {
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snprintf(lang_path, MAXPATHLEN, "%s/%s/bin", scripts_path,
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lang_dirent.d_name);
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lang_dir = opendir(lang_path);
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if (!lang_dir)
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continue;
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for_each_script(lang_path, lang_dir, script_dirent, script_next) {
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script_root = strdup(script_dirent.d_name);
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str = (char *)ends_with(script_root, REPORT_SUFFIX);
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if (str) {
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*str = '\0';
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desc = script_desc__findnew(script_root);
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snprintf(script_path, MAXPATHLEN, "%s/%s",
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lang_path, script_dirent.d_name);
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read_script_info(desc, script_path);
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}
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free(script_root);
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}
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}
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fprintf(stdout, "List of available trace scripts:\n");
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list_for_each_entry(desc, &script_descs, node) {
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sprintf(first_half, "%s %s", desc->name,
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desc->args ? desc->args : "");
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fprintf(stdout, " %-36s %s\n", first_half,
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desc->half_liner ? desc->half_liner : "");
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}
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exit(0);
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}
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static char *get_script_path(const char *script_root, const char *suffix)
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{
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struct dirent *script_next, *lang_next, script_dirent, lang_dirent;
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char scripts_path[MAXPATHLEN];
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char script_path[MAXPATHLEN];
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DIR *scripts_dir, *lang_dir;
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char lang_path[MAXPATHLEN];
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char *str, *__script_root;
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char *path = NULL;
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snprintf(scripts_path, MAXPATHLEN, "%s/scripts", perf_exec_path());
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scripts_dir = opendir(scripts_path);
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if (!scripts_dir)
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return NULL;
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for_each_lang(scripts_path, scripts_dir, lang_dirent, lang_next) {
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snprintf(lang_path, MAXPATHLEN, "%s/%s/bin", scripts_path,
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lang_dirent.d_name);
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lang_dir = opendir(lang_path);
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if (!lang_dir)
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continue;
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for_each_script(lang_path, lang_dir, script_dirent, script_next) {
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__script_root = strdup(script_dirent.d_name);
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str = (char *)ends_with(__script_root, suffix);
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if (str) {
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*str = '\0';
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if (strcmp(__script_root, script_root))
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continue;
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snprintf(script_path, MAXPATHLEN, "%s/%s",
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lang_path, script_dirent.d_name);
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path = strdup(script_path);
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free(__script_root);
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break;
|
|
}
|
|
free(__script_root);
|
|
}
|
|
}
|
|
|
|
return path;
|
|
}
|
|
|
|
static bool is_top_script(const char *script_path)
|
|
{
|
|
return ends_with(script_path, "top") == NULL ? false : true;
|
|
}
|
|
|
|
static int has_required_arg(char *script_path)
|
|
{
|
|
struct script_desc *desc;
|
|
int n_args = 0;
|
|
char *p;
|
|
|
|
desc = script_desc__new(NULL);
|
|
|
|
if (read_script_info(desc, script_path))
|
|
goto out;
|
|
|
|
if (!desc->args)
|
|
goto out;
|
|
|
|
for (p = desc->args; *p; p++)
|
|
if (*p == '<')
|
|
n_args++;
|
|
out:
|
|
script_desc__delete(desc);
|
|
|
|
return n_args;
|
|
}
|
|
|
|
static const char * const script_usage[] = {
|
|
"perf script [<options>]",
|
|
"perf script [<options>] record <script> [<record-options>] <command>",
|
|
"perf script [<options>] report <script> [script-args]",
|
|
"perf script [<options>] <script> [<record-options>] <command>",
|
|
"perf script [<options>] <top-script> [script-args]",
|
|
NULL
|
|
};
|
|
|
|
static const struct option options[] = {
|
|
OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
|
|
"dump raw trace in ASCII"),
|
|
OPT_INCR('v', "verbose", &verbose,
|
|
"be more verbose (show symbol address, etc)"),
|
|
OPT_BOOLEAN('L', "Latency", &latency_format,
|
|
"show latency attributes (irqs/preemption disabled, etc)"),
|
|
OPT_CALLBACK_NOOPT('l', "list", NULL, NULL, "list available scripts",
|
|
list_available_scripts),
|
|
OPT_CALLBACK('s', "script", NULL, "name",
|
|
"script file name (lang:script name, script name, or *)",
|
|
parse_scriptname),
|
|
OPT_STRING('g', "gen-script", &generate_script_lang, "lang",
|
|
"generate perf-script.xx script in specified language"),
|
|
OPT_STRING('i', "input", &input_name, "file",
|
|
"input file name"),
|
|
OPT_BOOLEAN('d', "debug-mode", &debug_mode,
|
|
"do various checks like samples ordering and lost events"),
|
|
|
|
OPT_END()
|
|
};
|
|
|
|
static bool have_cmd(int argc, const char **argv)
|
|
{
|
|
char **__argv = malloc(sizeof(const char *) * argc);
|
|
|
|
if (!__argv)
|
|
die("malloc");
|
|
memcpy(__argv, argv, sizeof(const char *) * argc);
|
|
argc = parse_options(argc, (const char **)__argv, record_options,
|
|
NULL, PARSE_OPT_STOP_AT_NON_OPTION);
|
|
free(__argv);
|
|
|
|
return argc != 0;
|
|
}
|
|
|
|
int cmd_script(int argc, const char **argv, const char *prefix __used)
|
|
{
|
|
char *rec_script_path = NULL;
|
|
char *rep_script_path = NULL;
|
|
struct perf_session *session;
|
|
char *script_path = NULL;
|
|
const char **__argv;
|
|
bool system_wide;
|
|
int i, j, err;
|
|
|
|
setup_scripting();
|
|
|
|
argc = parse_options(argc, argv, options, script_usage,
|
|
PARSE_OPT_STOP_AT_NON_OPTION);
|
|
|
|
if (argc > 1 && !strncmp(argv[0], "rec", strlen("rec"))) {
|
|
rec_script_path = get_script_path(argv[1], RECORD_SUFFIX);
|
|
if (!rec_script_path)
|
|
return cmd_record(argc, argv, NULL);
|
|
}
|
|
|
|
if (argc > 1 && !strncmp(argv[0], "rep", strlen("rep"))) {
|
|
rep_script_path = get_script_path(argv[1], REPORT_SUFFIX);
|
|
if (!rep_script_path) {
|
|
fprintf(stderr,
|
|
"Please specify a valid report script"
|
|
"(see 'perf script -l' for listing)\n");
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/* make sure PERF_EXEC_PATH is set for scripts */
|
|
perf_set_argv_exec_path(perf_exec_path());
|
|
|
|
if (argc && !script_name && !rec_script_path && !rep_script_path) {
|
|
int live_pipe[2];
|
|
int rep_args;
|
|
pid_t pid;
|
|
|
|
rec_script_path = get_script_path(argv[0], RECORD_SUFFIX);
|
|
rep_script_path = get_script_path(argv[0], REPORT_SUFFIX);
|
|
|
|
if (!rec_script_path && !rep_script_path) {
|
|
fprintf(stderr, " Couldn't find script %s\n\n See perf"
|
|
" script -l for available scripts.\n", argv[0]);
|
|
usage_with_options(script_usage, options);
|
|
}
|
|
|
|
if (is_top_script(argv[0])) {
|
|
rep_args = argc - 1;
|
|
} else {
|
|
int rec_args;
|
|
|
|
rep_args = has_required_arg(rep_script_path);
|
|
rec_args = (argc - 1) - rep_args;
|
|
if (rec_args < 0) {
|
|
fprintf(stderr, " %s script requires options."
|
|
"\n\n See perf script -l for available "
|
|
"scripts and options.\n", argv[0]);
|
|
usage_with_options(script_usage, options);
|
|
}
|
|
}
|
|
|
|
if (pipe(live_pipe) < 0) {
|
|
perror("failed to create pipe");
|
|
exit(-1);
|
|
}
|
|
|
|
pid = fork();
|
|
if (pid < 0) {
|
|
perror("failed to fork");
|
|
exit(-1);
|
|
}
|
|
|
|
if (!pid) {
|
|
system_wide = true;
|
|
j = 0;
|
|
|
|
dup2(live_pipe[1], 1);
|
|
close(live_pipe[0]);
|
|
|
|
if (!is_top_script(argv[0]))
|
|
system_wide = !have_cmd(argc - rep_args,
|
|
&argv[rep_args]);
|
|
|
|
__argv = malloc((argc + 6) * sizeof(const char *));
|
|
if (!__argv)
|
|
die("malloc");
|
|
|
|
__argv[j++] = "/bin/sh";
|
|
__argv[j++] = rec_script_path;
|
|
if (system_wide)
|
|
__argv[j++] = "-a";
|
|
__argv[j++] = "-q";
|
|
__argv[j++] = "-o";
|
|
__argv[j++] = "-";
|
|
for (i = rep_args + 1; i < argc; i++)
|
|
__argv[j++] = argv[i];
|
|
__argv[j++] = NULL;
|
|
|
|
execvp("/bin/sh", (char **)__argv);
|
|
free(__argv);
|
|
exit(-1);
|
|
}
|
|
|
|
dup2(live_pipe[0], 0);
|
|
close(live_pipe[1]);
|
|
|
|
__argv = malloc((argc + 4) * sizeof(const char *));
|
|
if (!__argv)
|
|
die("malloc");
|
|
j = 0;
|
|
__argv[j++] = "/bin/sh";
|
|
__argv[j++] = rep_script_path;
|
|
for (i = 1; i < rep_args + 1; i++)
|
|
__argv[j++] = argv[i];
|
|
__argv[j++] = "-i";
|
|
__argv[j++] = "-";
|
|
__argv[j++] = NULL;
|
|
|
|
execvp("/bin/sh", (char **)__argv);
|
|
free(__argv);
|
|
exit(-1);
|
|
}
|
|
|
|
if (rec_script_path)
|
|
script_path = rec_script_path;
|
|
if (rep_script_path)
|
|
script_path = rep_script_path;
|
|
|
|
if (script_path) {
|
|
system_wide = false;
|
|
j = 0;
|
|
|
|
if (rec_script_path)
|
|
system_wide = !have_cmd(argc - 1, &argv[1]);
|
|
|
|
__argv = malloc((argc + 2) * sizeof(const char *));
|
|
if (!__argv)
|
|
die("malloc");
|
|
__argv[j++] = "/bin/sh";
|
|
__argv[j++] = script_path;
|
|
if (system_wide)
|
|
__argv[j++] = "-a";
|
|
for (i = 2; i < argc; i++)
|
|
__argv[j++] = argv[i];
|
|
__argv[j++] = NULL;
|
|
|
|
execvp("/bin/sh", (char **)__argv);
|
|
free(__argv);
|
|
exit(-1);
|
|
}
|
|
|
|
if (symbol__init() < 0)
|
|
return -1;
|
|
if (!script_name)
|
|
setup_pager();
|
|
|
|
session = perf_session__new(input_name, O_RDONLY, 0, false, &event_ops);
|
|
if (session == NULL)
|
|
return -ENOMEM;
|
|
|
|
if (strcmp(input_name, "-") &&
|
|
!perf_session__has_traces(session, "record -R"))
|
|
return -EINVAL;
|
|
|
|
if (generate_script_lang) {
|
|
struct stat perf_stat;
|
|
|
|
int input = open(input_name, O_RDONLY);
|
|
if (input < 0) {
|
|
perror("failed to open file");
|
|
exit(-1);
|
|
}
|
|
|
|
err = fstat(input, &perf_stat);
|
|
if (err < 0) {
|
|
perror("failed to stat file");
|
|
exit(-1);
|
|
}
|
|
|
|
if (!perf_stat.st_size) {
|
|
fprintf(stderr, "zero-sized file, nothing to do!\n");
|
|
exit(0);
|
|
}
|
|
|
|
scripting_ops = script_spec__lookup(generate_script_lang);
|
|
if (!scripting_ops) {
|
|
fprintf(stderr, "invalid language specifier");
|
|
return -1;
|
|
}
|
|
|
|
err = scripting_ops->generate_script("perf-script");
|
|
goto out;
|
|
}
|
|
|
|
if (script_name) {
|
|
err = scripting_ops->start_script(script_name, argc, argv);
|
|
if (err)
|
|
goto out;
|
|
pr_debug("perf script started with script %s\n\n", script_name);
|
|
}
|
|
|
|
err = __cmd_script(session);
|
|
|
|
perf_session__delete(session);
|
|
cleanup_scripting();
|
|
out:
|
|
return err;
|
|
}
|