Merge tag 'locks-v3.16-2' of git://git.samba.org/jlayton/linux
[linux/fpc-iii.git] / tools / perf / util / record.c
blob049e0a09ccd362b6f79192fe769f75648f3730b1
1 #include "evlist.h"
2 #include "evsel.h"
3 #include "cpumap.h"
4 #include "parse-events.h"
5 #include <api/fs/fs.h>
6 #include "util.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();
17 if (!evlist)
18 return -ENOMEM;
20 if (parse_events(evlist, str))
21 goto out_delete;
23 evsel = perf_evlist__first(evlist);
25 fd = sys_perf_event_open(&evsel->attr, -1, cpu, -1, 0);
26 if (fd < 0)
27 goto out_delete;
28 close(fd);
30 fn(evsel);
32 fd = sys_perf_event_open(&evsel->attr, -1, cpu, -1, 0);
33 if (fd < 0) {
34 if (errno == EINVAL)
35 err = -EINVAL;
36 goto out_delete;
38 close(fd);
39 err = 0;
41 out_delete:
42 perf_evlist__delete(evlist);
43 return err;
46 static bool perf_probe_api(setup_probe_fn_t fn)
48 const char *try[] = {"cycles:u", "instructions:u", "cpu-clock", NULL};
49 struct cpu_map *cpus;
50 int cpu, ret, i = 0;
52 cpus = cpu_map__new(NULL);
53 if (!cpus)
54 return false;
55 cpu = cpus->map[0];
56 cpu_map__delete(cpus);
58 do {
59 ret = perf_do_probe_api(fn, cpu, try[i++]);
60 if (!ret)
61 return true;
62 } while (ret == -EAGAIN && try[i]);
64 return false;
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.
86 if (opts->group)
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)
100 continue;
101 use_sample_identifier = perf_can_sample_identifier();
102 break;
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)
113 char path[PATH_MAX];
114 const char *procfs = procfs__mountpoint();
116 if (!procfs)
117 return -1;
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;
132 if (user_freq)
133 opts->freq = opts->user_freq;
136 * User specified count overrides default frequency.
138 if (opts->default_interval)
139 opts->freq = 0;
140 else if (opts->freq) {
141 opts->default_interval = opts->freq;
142 } else {
143 pr_err("frequency and count are zero, aborting\n");
144 return -1;
147 if (get_max_rate(&max_rate))
148 return 0;
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",
157 max_rate);
158 return -1;
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",
168 max_rate);
169 opts->freq = max_rate;
172 return 0;
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;
184 int err, fd, cpu;
185 bool ret = false;
187 temp_evlist = perf_evlist__new();
188 if (!temp_evlist)
189 return false;
191 err = parse_events(temp_evlist, str);
192 if (err)
193 goto out_delete;
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);
202 } else {
203 cpu = evlist->cpus->map[0];
206 fd = sys_perf_event_open(&evsel->attr, -1, cpu, -1, 0);
207 if (fd >= 0) {
208 close(fd);
209 ret = true;
212 out_delete:
213 perf_evlist__delete(temp_evlist);
214 return ret;