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, struct record_opts *opts)
79 struct perf_evsel *evsel;
80 bool use_sample_identifier = false;
83 * Set the evsel leader links before we configure attributes,
84 * since some might depend on this info.
87 perf_evlist__set_leader(evlist);
89 if (evlist->cpus->map[0] < 0)
90 opts->no_inherit = true;
92 evlist__for_each(evlist, evsel)
93 perf_evsel__config(evsel, opts);
95 if (evlist->nr_entries > 1) {
96 struct perf_evsel *first = perf_evlist__first(evlist);
98 evlist__for_each(evlist, evsel) {
99 if (evsel->attr.sample_type == first->attr.sample_type)
101 use_sample_identifier = perf_can_sample_identifier();
104 evlist__for_each(evlist, evsel)
105 perf_evsel__set_sample_id(evsel, use_sample_identifier);
108 perf_evlist__set_id_pos(evlist);
111 static int get_max_rate(unsigned int *rate)
114 const char *procfs = procfs__mountpoint();
119 snprintf(path, PATH_MAX,
120 "%s/sys/kernel/perf_event_max_sample_rate", procfs);
122 return filename__read_int(path, (int *) rate);
125 static int record_opts__config_freq(struct record_opts *opts)
127 bool user_freq = opts->user_freq != UINT_MAX;
128 unsigned int max_rate;
130 if (opts->user_interval != ULLONG_MAX)
131 opts->default_interval = opts->user_interval;
133 opts->freq = opts->user_freq;
136 * User specified count overrides default frequency.
138 if (opts->default_interval)
140 else if (opts->freq) {
141 opts->default_interval = opts->freq;
143 pr_err("frequency and count are zero, aborting\n");
147 if (get_max_rate(&max_rate))
151 * User specified frequency is over current maximum.
153 if (user_freq && (max_rate < opts->freq)) {
154 pr_err("Maximum frequency rate (%u) reached.\n"
155 "Please use -F freq option with lower value or consider\n"
156 "tweaking /proc/sys/kernel/perf_event_max_sample_rate.\n",
162 * Default frequency is over current maximum.
164 if (max_rate < opts->freq) {
165 pr_warning("Lowering default frequency rate to %u.\n"
166 "Please consider tweaking "
167 "/proc/sys/kernel/perf_event_max_sample_rate.\n",
169 opts->freq = max_rate;
175 int record_opts__config(struct record_opts *opts)
177 return record_opts__config_freq(opts);
180 bool perf_evlist__can_select_event(struct perf_evlist *evlist, const char *str)
182 struct perf_evlist *temp_evlist;
183 struct perf_evsel *evsel;
187 temp_evlist = perf_evlist__new();
191 err = parse_events(temp_evlist, str);
195 evsel = perf_evlist__last(temp_evlist);
197 if (!evlist || cpu_map__empty(evlist->cpus)) {
198 struct cpu_map *cpus = cpu_map__new(NULL);
200 cpu = cpus ? cpus->map[0] : 0;
201 cpu_map__delete(cpus);
203 cpu = evlist->cpus->map[0];
206 fd = sys_perf_event_open(&evsel->attr, -1, cpu, -1, 0);
213 perf_evlist__delete(temp_evlist);