4 #include "parse-events.h"
9 typedef void (*setup_probe_fn_t)(struct perf_evsel *evsel);
11 static int perf_do_probe_api(setup_probe_fn_t fn, int cpu, const char *str)
13 struct perf_evlist *evlist;
14 struct perf_evsel *evsel;
15 unsigned long flags = perf_event_open_cloexec_flag();
16 int err = -EAGAIN, fd;
17 static pid_t pid = -1;
19 evlist = perf_evlist__new();
23 if (parse_events(evlist, str, NULL))
26 evsel = perf_evlist__first(evlist);
29 fd = sys_perf_event_open(&evsel->attr, pid, cpu, -1, flags);
31 if (pid == -1 && errno == EACCES) {
43 fd = sys_perf_event_open(&evsel->attr, pid, cpu, -1, flags);
53 perf_evlist__delete(evlist);
57 static bool perf_probe_api(setup_probe_fn_t fn)
59 const char *try[] = {"cycles:u", "instructions:u", "cpu-clock:u", NULL};
63 cpus = cpu_map__new(NULL);
70 ret = perf_do_probe_api(fn, cpu, try[i++]);
73 } while (ret == -EAGAIN && try[i]);
78 static void perf_probe_sample_identifier(struct perf_evsel *evsel)
80 evsel->attr.sample_type |= PERF_SAMPLE_IDENTIFIER;
83 static void perf_probe_comm_exec(struct perf_evsel *evsel)
85 evsel->attr.comm_exec = 1;
88 static void perf_probe_context_switch(struct perf_evsel *evsel)
90 evsel->attr.context_switch = 1;
93 bool perf_can_sample_identifier(void)
95 return perf_probe_api(perf_probe_sample_identifier);
98 static bool perf_can_comm_exec(void)
100 return perf_probe_api(perf_probe_comm_exec);
103 bool perf_can_record_switch_events(void)
105 return perf_probe_api(perf_probe_context_switch);
108 bool perf_can_record_cpu_wide(void)
110 struct perf_event_attr attr = {
111 .type = PERF_TYPE_SOFTWARE,
112 .config = PERF_COUNT_SW_CPU_CLOCK,
115 struct cpu_map *cpus;
118 cpus = cpu_map__new(NULL);
124 fd = sys_perf_event_open(&attr, -1, cpu, -1, 0);
132 void perf_evlist__config(struct perf_evlist *evlist, struct record_opts *opts,
133 struct callchain_param *callchain)
135 struct perf_evsel *evsel;
136 bool use_sample_identifier = false;
140 * Set the evsel leader links before we configure attributes,
141 * since some might depend on this info.
144 perf_evlist__set_leader(evlist);
146 if (evlist->cpus->map[0] < 0)
147 opts->no_inherit = true;
149 use_comm_exec = perf_can_comm_exec();
151 evlist__for_each_entry(evlist, evsel) {
152 perf_evsel__config(evsel, opts, callchain);
153 if (evsel->tracking && use_comm_exec)
154 evsel->attr.comm_exec = 1;
157 if (opts->full_auxtrace) {
159 * Need to be able to synthesize and parse selected events with
160 * arbitrary sample types, which requires always being able to
163 use_sample_identifier = perf_can_sample_identifier();
164 evlist__for_each_entry(evlist, evsel)
165 perf_evsel__set_sample_id(evsel, use_sample_identifier);
166 } else if (evlist->nr_entries > 1) {
167 struct perf_evsel *first = perf_evlist__first(evlist);
169 evlist__for_each_entry(evlist, evsel) {
170 if (evsel->attr.sample_type == first->attr.sample_type)
172 use_sample_identifier = perf_can_sample_identifier();
175 evlist__for_each_entry(evlist, evsel)
176 perf_evsel__set_sample_id(evsel, use_sample_identifier);
179 perf_evlist__set_id_pos(evlist);
182 static int get_max_rate(unsigned int *rate)
184 return sysctl__read_int("kernel/perf_event_max_sample_rate", (int *)rate);
187 static int record_opts__config_freq(struct record_opts *opts)
189 bool user_freq = opts->user_freq != UINT_MAX;
190 unsigned int max_rate;
192 if (opts->user_interval != ULLONG_MAX)
193 opts->default_interval = opts->user_interval;
195 opts->freq = opts->user_freq;
198 * User specified count overrides default frequency.
200 if (opts->default_interval)
202 else if (opts->freq) {
203 opts->default_interval = opts->freq;
205 pr_err("frequency and count are zero, aborting\n");
209 if (get_max_rate(&max_rate))
213 * User specified frequency is over current maximum.
215 if (user_freq && (max_rate < opts->freq)) {
216 pr_err("Maximum frequency rate (%u) reached.\n"
217 "Please use -F freq option with lower value or consider\n"
218 "tweaking /proc/sys/kernel/perf_event_max_sample_rate.\n",
224 * Default frequency is over current maximum.
226 if (max_rate < opts->freq) {
227 pr_warning("Lowering default frequency rate to %u.\n"
228 "Please consider tweaking "
229 "/proc/sys/kernel/perf_event_max_sample_rate.\n",
231 opts->freq = max_rate;
237 int record_opts__config(struct record_opts *opts)
239 return record_opts__config_freq(opts);
242 bool perf_evlist__can_select_event(struct perf_evlist *evlist, const char *str)
244 struct perf_evlist *temp_evlist;
245 struct perf_evsel *evsel;
250 temp_evlist = perf_evlist__new();
254 err = parse_events(temp_evlist, str, NULL);
258 evsel = perf_evlist__last(temp_evlist);
260 if (!evlist || cpu_map__empty(evlist->cpus)) {
261 struct cpu_map *cpus = cpu_map__new(NULL);
263 cpu = cpus ? cpus->map[0] : 0;
266 cpu = evlist->cpus->map[0];
270 fd = sys_perf_event_open(&evsel->attr, pid, cpu, -1,
271 perf_event_open_cloexec_flag());
273 if (pid == -1 && errno == EACCES) {
285 perf_evlist__delete(temp_evlist);