4 #include "parse-events.h"
8 typedef void (*setup_probe_fn_t)(struct perf_evsel *evsel);
10 static int perf_do_probe_api(setup_probe_fn_t fn, int cpu, const char *str)
12 struct perf_evlist *evlist;
13 struct perf_evsel *evsel;
14 int err = -EAGAIN, fd;
16 evlist = perf_evlist__new();
20 if (parse_events(evlist, str))
23 evsel = perf_evlist__first(evlist);
25 fd = sys_perf_event_open(&evsel->attr, -1, cpu, -1, 0);
32 fd = sys_perf_event_open(&evsel->attr, -1, cpu, -1, 0);
42 perf_evlist__delete(evlist);
46 static bool perf_probe_api(setup_probe_fn_t fn)
48 const char *try[] = {"cycles:u", "instructions:u", "cpu-clock", NULL};
52 cpus = cpu_map__new(NULL);
56 cpu_map__delete(cpus);
59 ret = perf_do_probe_api(fn, cpu, try[i++]);
62 } while (ret == -EAGAIN && try[i]);
67 static void perf_probe_sample_identifier(struct perf_evsel *evsel)
69 evsel->attr.sample_type |= PERF_SAMPLE_IDENTIFIER;
72 bool perf_can_sample_identifier(void)
74 return perf_probe_api(perf_probe_sample_identifier);
77 void perf_evlist__config(struct perf_evlist *evlist,
78 struct perf_record_opts *opts)
80 struct perf_evsel *evsel;
81 bool use_sample_identifier = false;
84 * Set the evsel leader links before we configure attributes,
85 * since some might depend on this info.
88 perf_evlist__set_leader(evlist);
90 if (evlist->cpus->map[0] < 0)
91 opts->no_inherit = true;
93 list_for_each_entry(evsel, &evlist->entries, node)
94 perf_evsel__config(evsel, opts);
96 if (evlist->nr_entries > 1) {
97 struct perf_evsel *first = perf_evlist__first(evlist);
99 list_for_each_entry(evsel, &evlist->entries, node) {
100 if (evsel->attr.sample_type == first->attr.sample_type)
102 use_sample_identifier = perf_can_sample_identifier();
105 list_for_each_entry(evsel, &evlist->entries, node)
106 perf_evsel__set_sample_id(evsel, use_sample_identifier);
109 perf_evlist__set_id_pos(evlist);
112 static int get_max_rate(unsigned int *rate)
115 const char *procfs = procfs__mountpoint();
120 snprintf(path, PATH_MAX,
121 "%s/sys/kernel/perf_event_max_sample_rate", procfs);
123 return filename__read_int(path, (int *) rate);
126 static int perf_record_opts__config_freq(struct perf_record_opts *opts)
128 bool user_freq = opts->user_freq != UINT_MAX;
129 unsigned int max_rate;
131 if (opts->user_interval != ULLONG_MAX)
132 opts->default_interval = opts->user_interval;
134 opts->freq = opts->user_freq;
137 * User specified count overrides default frequency.
139 if (opts->default_interval)
141 else if (opts->freq) {
142 opts->default_interval = opts->freq;
144 pr_err("frequency and count are zero, aborting\n");
148 if (get_max_rate(&max_rate))
152 * User specified frequency is over current maximum.
154 if (user_freq && (max_rate < opts->freq)) {
155 pr_err("Maximum frequency rate (%u) reached.\n"
156 "Please use -F freq option with lower value or consider\n"
157 "tweaking /proc/sys/kernel/perf_event_max_sample_rate.\n",
163 * Default frequency is over current maximum.
165 if (max_rate < opts->freq) {
166 pr_warning("Lowering default frequency rate to %u.\n"
167 "Please consider tweaking "
168 "/proc/sys/kernel/perf_event_max_sample_rate.\n",
170 opts->freq = max_rate;
176 int perf_record_opts__config(struct perf_record_opts *opts)
178 return perf_record_opts__config_freq(opts);