2 * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
4 * Parts came from builtin-{top,stat,record}.c, see those files for further
7 * Released under the GPL v2. (and only v2, not any later version)
13 #include <linux/bitops.h>
14 #include <api/fs/fs.h>
15 #include <api/fs/tracing_path.h>
16 #include <traceevent/event-parse.h>
17 #include <linux/hw_breakpoint.h>
18 #include <linux/perf_event.h>
19 #include <linux/compiler.h>
20 #include <linux/err.h>
21 #include <sys/ioctl.h>
22 #include <sys/resource.h>
23 #include <sys/types.h>
26 #include "callchain.h"
33 #include "thread_map.h"
35 #include "perf_regs.h"
37 #include "trace-event.h"
39 #include "util/parse-branch-options.h"
41 #include "sane_ctype.h"
53 } perf_missing_features;
55 static clockid_t clockid;
57 static int perf_evsel__no_extra_init(struct perf_evsel *evsel __maybe_unused)
62 void __weak test_attr__ready(void) { }
64 static void perf_evsel__no_extra_fini(struct perf_evsel *evsel __maybe_unused)
70 int (*init)(struct perf_evsel *evsel);
71 void (*fini)(struct perf_evsel *evsel);
72 } perf_evsel__object = {
73 .size = sizeof(struct perf_evsel),
74 .init = perf_evsel__no_extra_init,
75 .fini = perf_evsel__no_extra_fini,
78 int perf_evsel__object_config(size_t object_size,
79 int (*init)(struct perf_evsel *evsel),
80 void (*fini)(struct perf_evsel *evsel))
86 if (perf_evsel__object.size > object_size)
89 perf_evsel__object.size = object_size;
93 perf_evsel__object.init = init;
96 perf_evsel__object.fini = fini;
101 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
103 int __perf_evsel__sample_size(u64 sample_type)
105 u64 mask = sample_type & PERF_SAMPLE_MASK;
109 for (i = 0; i < 64; i++) {
110 if (mask & (1ULL << i))
120 * __perf_evsel__calc_id_pos - calculate id_pos.
121 * @sample_type: sample type
123 * This function returns the position of the event id (PERF_SAMPLE_ID or
124 * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct
127 static int __perf_evsel__calc_id_pos(u64 sample_type)
131 if (sample_type & PERF_SAMPLE_IDENTIFIER)
134 if (!(sample_type & PERF_SAMPLE_ID))
137 if (sample_type & PERF_SAMPLE_IP)
140 if (sample_type & PERF_SAMPLE_TID)
143 if (sample_type & PERF_SAMPLE_TIME)
146 if (sample_type & PERF_SAMPLE_ADDR)
153 * __perf_evsel__calc_is_pos - calculate is_pos.
154 * @sample_type: sample type
156 * This function returns the position (counting backwards) of the event id
157 * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if
158 * sample_id_all is used there is an id sample appended to non-sample events.
160 static int __perf_evsel__calc_is_pos(u64 sample_type)
164 if (sample_type & PERF_SAMPLE_IDENTIFIER)
167 if (!(sample_type & PERF_SAMPLE_ID))
170 if (sample_type & PERF_SAMPLE_CPU)
173 if (sample_type & PERF_SAMPLE_STREAM_ID)
179 void perf_evsel__calc_id_pos(struct perf_evsel *evsel)
181 evsel->id_pos = __perf_evsel__calc_id_pos(evsel->attr.sample_type);
182 evsel->is_pos = __perf_evsel__calc_is_pos(evsel->attr.sample_type);
185 void __perf_evsel__set_sample_bit(struct perf_evsel *evsel,
186 enum perf_event_sample_format bit)
188 if (!(evsel->attr.sample_type & bit)) {
189 evsel->attr.sample_type |= bit;
190 evsel->sample_size += sizeof(u64);
191 perf_evsel__calc_id_pos(evsel);
195 void __perf_evsel__reset_sample_bit(struct perf_evsel *evsel,
196 enum perf_event_sample_format bit)
198 if (evsel->attr.sample_type & bit) {
199 evsel->attr.sample_type &= ~bit;
200 evsel->sample_size -= sizeof(u64);
201 perf_evsel__calc_id_pos(evsel);
205 void perf_evsel__set_sample_id(struct perf_evsel *evsel,
206 bool can_sample_identifier)
208 if (can_sample_identifier) {
209 perf_evsel__reset_sample_bit(evsel, ID);
210 perf_evsel__set_sample_bit(evsel, IDENTIFIER);
212 perf_evsel__set_sample_bit(evsel, ID);
214 evsel->attr.read_format |= PERF_FORMAT_ID;
218 * perf_evsel__is_function_event - Return whether given evsel is a function
221 * @evsel - evsel selector to be tested
223 * Return %true if event is function trace event
225 bool perf_evsel__is_function_event(struct perf_evsel *evsel)
227 #define FUNCTION_EVENT "ftrace:function"
229 return evsel->name &&
230 !strncmp(FUNCTION_EVENT, evsel->name, sizeof(FUNCTION_EVENT));
232 #undef FUNCTION_EVENT
235 void perf_evsel__init(struct perf_evsel *evsel,
236 struct perf_event_attr *attr, int idx)
239 evsel->tracking = !idx;
241 evsel->leader = evsel;
244 evsel->evlist = NULL;
246 INIT_LIST_HEAD(&evsel->node);
247 INIT_LIST_HEAD(&evsel->config_terms);
248 perf_evsel__object.init(evsel);
249 evsel->sample_size = __perf_evsel__sample_size(attr->sample_type);
250 perf_evsel__calc_id_pos(evsel);
251 evsel->cmdline_group_boundary = false;
252 evsel->metric_expr = NULL;
253 evsel->metric_name = NULL;
254 evsel->metric_events = NULL;
255 evsel->collect_stat = false;
258 struct perf_evsel *perf_evsel__new_idx(struct perf_event_attr *attr, int idx)
260 struct perf_evsel *evsel = zalloc(perf_evsel__object.size);
263 perf_evsel__init(evsel, attr, idx);
265 if (perf_evsel__is_bpf_output(evsel)) {
266 evsel->attr.sample_type |= (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
267 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
268 evsel->attr.sample_period = 1;
274 struct perf_evsel *perf_evsel__new_cycles(bool precise)
276 struct perf_event_attr attr = {
277 .type = PERF_TYPE_HARDWARE,
278 .config = PERF_COUNT_HW_CPU_CYCLES,
279 .exclude_kernel = geteuid() != 0,
281 struct perf_evsel *evsel;
283 event_attr_init(&attr);
288 * Unnamed union member, not supported as struct member named
289 * initializer in older compilers such as gcc 4.4.7
291 * Just for probing the precise_ip:
293 attr.sample_period = 1;
295 perf_event_attr__set_max_precise_ip(&attr);
297 * Now let the usual logic to set up the perf_event_attr defaults
298 * to kick in when we return and before perf_evsel__open() is called.
300 attr.sample_period = 0;
302 evsel = perf_evsel__new(&attr);
306 /* use asprintf() because free(evsel) assumes name is allocated */
307 if (asprintf(&evsel->name, "cycles%s%s%.*s",
308 (attr.precise_ip || attr.exclude_kernel) ? ":" : "",
309 attr.exclude_kernel ? "u" : "",
310 attr.precise_ip ? attr.precise_ip + 1 : 0, "ppp") < 0)
315 perf_evsel__delete(evsel);
321 * Returns pointer with encoded error via <linux/err.h> interface.
323 struct perf_evsel *perf_evsel__newtp_idx(const char *sys, const char *name, int idx)
325 struct perf_evsel *evsel = zalloc(perf_evsel__object.size);
331 struct perf_event_attr attr = {
332 .type = PERF_TYPE_TRACEPOINT,
333 .sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
334 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
337 if (asprintf(&evsel->name, "%s:%s", sys, name) < 0)
340 evsel->tp_format = trace_event__tp_format(sys, name);
341 if (IS_ERR(evsel->tp_format)) {
342 err = PTR_ERR(evsel->tp_format);
346 event_attr_init(&attr);
347 attr.config = evsel->tp_format->id;
348 attr.sample_period = 1;
349 perf_evsel__init(evsel, &attr, idx);
361 const char *perf_evsel__hw_names[PERF_COUNT_HW_MAX] = {
369 "stalled-cycles-frontend",
370 "stalled-cycles-backend",
374 static const char *__perf_evsel__hw_name(u64 config)
376 if (config < PERF_COUNT_HW_MAX && perf_evsel__hw_names[config])
377 return perf_evsel__hw_names[config];
379 return "unknown-hardware";
382 static int perf_evsel__add_modifiers(struct perf_evsel *evsel, char *bf, size_t size)
384 int colon = 0, r = 0;
385 struct perf_event_attr *attr = &evsel->attr;
386 bool exclude_guest_default = false;
388 #define MOD_PRINT(context, mod) do { \
389 if (!attr->exclude_##context) { \
390 if (!colon) colon = ++r; \
391 r += scnprintf(bf + r, size - r, "%c", mod); \
394 if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) {
395 MOD_PRINT(kernel, 'k');
396 MOD_PRINT(user, 'u');
398 exclude_guest_default = true;
401 if (attr->precise_ip) {
404 r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp");
405 exclude_guest_default = true;
408 if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) {
409 MOD_PRINT(host, 'H');
410 MOD_PRINT(guest, 'G');
418 static int perf_evsel__hw_name(struct perf_evsel *evsel, char *bf, size_t size)
420 int r = scnprintf(bf, size, "%s", __perf_evsel__hw_name(evsel->attr.config));
421 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
424 const char *perf_evsel__sw_names[PERF_COUNT_SW_MAX] = {
437 static const char *__perf_evsel__sw_name(u64 config)
439 if (config < PERF_COUNT_SW_MAX && perf_evsel__sw_names[config])
440 return perf_evsel__sw_names[config];
441 return "unknown-software";
444 static int perf_evsel__sw_name(struct perf_evsel *evsel, char *bf, size_t size)
446 int r = scnprintf(bf, size, "%s", __perf_evsel__sw_name(evsel->attr.config));
447 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
450 static int __perf_evsel__bp_name(char *bf, size_t size, u64 addr, u64 type)
454 r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr);
456 if (type & HW_BREAKPOINT_R)
457 r += scnprintf(bf + r, size - r, "r");
459 if (type & HW_BREAKPOINT_W)
460 r += scnprintf(bf + r, size - r, "w");
462 if (type & HW_BREAKPOINT_X)
463 r += scnprintf(bf + r, size - r, "x");
468 static int perf_evsel__bp_name(struct perf_evsel *evsel, char *bf, size_t size)
470 struct perf_event_attr *attr = &evsel->attr;
471 int r = __perf_evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type);
472 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
475 const char *perf_evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX]
476 [PERF_EVSEL__MAX_ALIASES] = {
477 { "L1-dcache", "l1-d", "l1d", "L1-data", },
478 { "L1-icache", "l1-i", "l1i", "L1-instruction", },
480 { "dTLB", "d-tlb", "Data-TLB", },
481 { "iTLB", "i-tlb", "Instruction-TLB", },
482 { "branch", "branches", "bpu", "btb", "bpc", },
486 const char *perf_evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX]
487 [PERF_EVSEL__MAX_ALIASES] = {
488 { "load", "loads", "read", },
489 { "store", "stores", "write", },
490 { "prefetch", "prefetches", "speculative-read", "speculative-load", },
493 const char *perf_evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX]
494 [PERF_EVSEL__MAX_ALIASES] = {
495 { "refs", "Reference", "ops", "access", },
496 { "misses", "miss", },
499 #define C(x) PERF_COUNT_HW_CACHE_##x
500 #define CACHE_READ (1 << C(OP_READ))
501 #define CACHE_WRITE (1 << C(OP_WRITE))
502 #define CACHE_PREFETCH (1 << C(OP_PREFETCH))
503 #define COP(x) (1 << x)
506 * cache operartion stat
507 * L1I : Read and prefetch only
508 * ITLB and BPU : Read-only
510 static unsigned long perf_evsel__hw_cache_stat[C(MAX)] = {
511 [C(L1D)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
512 [C(L1I)] = (CACHE_READ | CACHE_PREFETCH),
513 [C(LL)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
514 [C(DTLB)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
515 [C(ITLB)] = (CACHE_READ),
516 [C(BPU)] = (CACHE_READ),
517 [C(NODE)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
520 bool perf_evsel__is_cache_op_valid(u8 type, u8 op)
522 if (perf_evsel__hw_cache_stat[type] & COP(op))
523 return true; /* valid */
525 return false; /* invalid */
528 int __perf_evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result,
529 char *bf, size_t size)
532 return scnprintf(bf, size, "%s-%s-%s", perf_evsel__hw_cache[type][0],
533 perf_evsel__hw_cache_op[op][0],
534 perf_evsel__hw_cache_result[result][0]);
537 return scnprintf(bf, size, "%s-%s", perf_evsel__hw_cache[type][0],
538 perf_evsel__hw_cache_op[op][1]);
541 static int __perf_evsel__hw_cache_name(u64 config, char *bf, size_t size)
543 u8 op, result, type = (config >> 0) & 0xff;
544 const char *err = "unknown-ext-hardware-cache-type";
546 if (type >= PERF_COUNT_HW_CACHE_MAX)
549 op = (config >> 8) & 0xff;
550 err = "unknown-ext-hardware-cache-op";
551 if (op >= PERF_COUNT_HW_CACHE_OP_MAX)
554 result = (config >> 16) & 0xff;
555 err = "unknown-ext-hardware-cache-result";
556 if (result >= PERF_COUNT_HW_CACHE_RESULT_MAX)
559 err = "invalid-cache";
560 if (!perf_evsel__is_cache_op_valid(type, op))
563 return __perf_evsel__hw_cache_type_op_res_name(type, op, result, bf, size);
565 return scnprintf(bf, size, "%s", err);
568 static int perf_evsel__hw_cache_name(struct perf_evsel *evsel, char *bf, size_t size)
570 int ret = __perf_evsel__hw_cache_name(evsel->attr.config, bf, size);
571 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
574 static int perf_evsel__raw_name(struct perf_evsel *evsel, char *bf, size_t size)
576 int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->attr.config);
577 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
580 const char *perf_evsel__name(struct perf_evsel *evsel)
587 switch (evsel->attr.type) {
589 perf_evsel__raw_name(evsel, bf, sizeof(bf));
592 case PERF_TYPE_HARDWARE:
593 perf_evsel__hw_name(evsel, bf, sizeof(bf));
596 case PERF_TYPE_HW_CACHE:
597 perf_evsel__hw_cache_name(evsel, bf, sizeof(bf));
600 case PERF_TYPE_SOFTWARE:
601 perf_evsel__sw_name(evsel, bf, sizeof(bf));
604 case PERF_TYPE_TRACEPOINT:
605 scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint");
608 case PERF_TYPE_BREAKPOINT:
609 perf_evsel__bp_name(evsel, bf, sizeof(bf));
613 scnprintf(bf, sizeof(bf), "unknown attr type: %d",
618 evsel->name = strdup(bf);
620 return evsel->name ?: "unknown";
623 const char *perf_evsel__group_name(struct perf_evsel *evsel)
625 return evsel->group_name ?: "anon group";
628 int perf_evsel__group_desc(struct perf_evsel *evsel, char *buf, size_t size)
631 struct perf_evsel *pos;
632 const char *group_name = perf_evsel__group_name(evsel);
634 ret = scnprintf(buf, size, "%s", group_name);
636 ret += scnprintf(buf + ret, size - ret, " { %s",
637 perf_evsel__name(evsel));
639 for_each_group_member(pos, evsel)
640 ret += scnprintf(buf + ret, size - ret, ", %s",
641 perf_evsel__name(pos));
643 ret += scnprintf(buf + ret, size - ret, " }");
648 void perf_evsel__config_callchain(struct perf_evsel *evsel,
649 struct record_opts *opts,
650 struct callchain_param *param)
652 bool function = perf_evsel__is_function_event(evsel);
653 struct perf_event_attr *attr = &evsel->attr;
655 perf_evsel__set_sample_bit(evsel, CALLCHAIN);
657 attr->sample_max_stack = param->max_stack;
659 if (param->record_mode == CALLCHAIN_LBR) {
660 if (!opts->branch_stack) {
661 if (attr->exclude_user) {
662 pr_warning("LBR callstack option is only available "
663 "to get user callchain information. "
664 "Falling back to framepointers.\n");
666 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
667 attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER |
668 PERF_SAMPLE_BRANCH_CALL_STACK |
669 PERF_SAMPLE_BRANCH_NO_CYCLES |
670 PERF_SAMPLE_BRANCH_NO_FLAGS;
673 pr_warning("Cannot use LBR callstack with branch stack. "
674 "Falling back to framepointers.\n");
677 if (param->record_mode == CALLCHAIN_DWARF) {
679 perf_evsel__set_sample_bit(evsel, REGS_USER);
680 perf_evsel__set_sample_bit(evsel, STACK_USER);
681 attr->sample_regs_user = PERF_REGS_MASK;
682 attr->sample_stack_user = param->dump_size;
683 attr->exclude_callchain_user = 1;
685 pr_info("Cannot use DWARF unwind for function trace event,"
686 " falling back to framepointers.\n");
691 pr_info("Disabling user space callchains for function trace event.\n");
692 attr->exclude_callchain_user = 1;
697 perf_evsel__reset_callgraph(struct perf_evsel *evsel,
698 struct callchain_param *param)
700 struct perf_event_attr *attr = &evsel->attr;
702 perf_evsel__reset_sample_bit(evsel, CALLCHAIN);
703 if (param->record_mode == CALLCHAIN_LBR) {
704 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
705 attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER |
706 PERF_SAMPLE_BRANCH_CALL_STACK);
708 if (param->record_mode == CALLCHAIN_DWARF) {
709 perf_evsel__reset_sample_bit(evsel, REGS_USER);
710 perf_evsel__reset_sample_bit(evsel, STACK_USER);
714 static void apply_config_terms(struct perf_evsel *evsel,
715 struct record_opts *opts)
717 struct perf_evsel_config_term *term;
718 struct list_head *config_terms = &evsel->config_terms;
719 struct perf_event_attr *attr = &evsel->attr;
720 struct callchain_param param;
723 const char *callgraph_buf = NULL;
725 /* callgraph default */
726 param.record_mode = callchain_param.record_mode;
728 list_for_each_entry(term, config_terms, list) {
729 switch (term->type) {
730 case PERF_EVSEL__CONFIG_TERM_PERIOD:
731 attr->sample_period = term->val.period;
734 case PERF_EVSEL__CONFIG_TERM_FREQ:
735 attr->sample_freq = term->val.freq;
738 case PERF_EVSEL__CONFIG_TERM_TIME:
740 perf_evsel__set_sample_bit(evsel, TIME);
742 perf_evsel__reset_sample_bit(evsel, TIME);
744 case PERF_EVSEL__CONFIG_TERM_CALLGRAPH:
745 callgraph_buf = term->val.callgraph;
747 case PERF_EVSEL__CONFIG_TERM_BRANCH:
748 if (term->val.branch && strcmp(term->val.branch, "no")) {
749 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
750 parse_branch_str(term->val.branch,
751 &attr->branch_sample_type);
753 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
755 case PERF_EVSEL__CONFIG_TERM_STACK_USER:
756 dump_size = term->val.stack_user;
758 case PERF_EVSEL__CONFIG_TERM_MAX_STACK:
759 max_stack = term->val.max_stack;
761 case PERF_EVSEL__CONFIG_TERM_INHERIT:
763 * attr->inherit should has already been set by
764 * perf_evsel__config. If user explicitly set
765 * inherit using config terms, override global
766 * opt->no_inherit setting.
768 attr->inherit = term->val.inherit ? 1 : 0;
770 case PERF_EVSEL__CONFIG_TERM_OVERWRITE:
771 attr->write_backward = term->val.overwrite ? 1 : 0;
778 /* User explicitly set per-event callgraph, clear the old setting and reset. */
779 if ((callgraph_buf != NULL) || (dump_size > 0) || max_stack) {
781 param.max_stack = max_stack;
782 if (callgraph_buf == NULL)
783 callgraph_buf = "fp";
786 /* parse callgraph parameters */
787 if (callgraph_buf != NULL) {
788 if (!strcmp(callgraph_buf, "no")) {
789 param.enabled = false;
790 param.record_mode = CALLCHAIN_NONE;
792 param.enabled = true;
793 if (parse_callchain_record(callgraph_buf, ¶m)) {
794 pr_err("per-event callgraph setting for %s failed. "
795 "Apply callgraph global setting for it\n",
802 dump_size = round_up(dump_size, sizeof(u64));
803 param.dump_size = dump_size;
806 /* If global callgraph set, clear it */
807 if (callchain_param.enabled)
808 perf_evsel__reset_callgraph(evsel, &callchain_param);
810 /* set perf-event callgraph */
812 perf_evsel__config_callchain(evsel, opts, ¶m);
817 * The enable_on_exec/disabled value strategy:
819 * 1) For any type of traced program:
820 * - all independent events and group leaders are disabled
821 * - all group members are enabled
823 * Group members are ruled by group leaders. They need to
824 * be enabled, because the group scheduling relies on that.
826 * 2) For traced programs executed by perf:
827 * - all independent events and group leaders have
829 * - we don't specifically enable or disable any event during
832 * Independent events and group leaders are initially disabled
833 * and get enabled by exec. Group members are ruled by group
834 * leaders as stated in 1).
836 * 3) For traced programs attached by perf (pid/tid):
837 * - we specifically enable or disable all events during
840 * When attaching events to already running traced we
841 * enable/disable events specifically, as there's no
842 * initial traced exec call.
844 void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts,
845 struct callchain_param *callchain)
847 struct perf_evsel *leader = evsel->leader;
848 struct perf_event_attr *attr = &evsel->attr;
849 int track = evsel->tracking;
850 bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread;
852 attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
853 attr->inherit = !opts->no_inherit;
854 attr->write_backward = opts->overwrite ? 1 : 0;
856 perf_evsel__set_sample_bit(evsel, IP);
857 perf_evsel__set_sample_bit(evsel, TID);
859 if (evsel->sample_read) {
860 perf_evsel__set_sample_bit(evsel, READ);
863 * We need ID even in case of single event, because
864 * PERF_SAMPLE_READ process ID specific data.
866 perf_evsel__set_sample_id(evsel, false);
869 * Apply group format only if we belong to group
870 * with more than one members.
872 if (leader->nr_members > 1) {
873 attr->read_format |= PERF_FORMAT_GROUP;
879 * We default some events to have a default interval. But keep
880 * it a weak assumption overridable by the user.
882 if (!attr->sample_period || (opts->user_freq != UINT_MAX ||
883 opts->user_interval != ULLONG_MAX)) {
885 perf_evsel__set_sample_bit(evsel, PERIOD);
887 attr->sample_freq = opts->freq;
889 attr->sample_period = opts->default_interval;
894 * Disable sampling for all group members other
895 * than leader in case leader 'leads' the sampling.
897 if ((leader != evsel) && leader->sample_read) {
898 attr->sample_freq = 0;
899 attr->sample_period = 0;
902 if (opts->no_samples)
903 attr->sample_freq = 0;
905 if (opts->inherit_stat) {
906 evsel->attr.read_format |=
907 PERF_FORMAT_TOTAL_TIME_ENABLED |
908 PERF_FORMAT_TOTAL_TIME_RUNNING |
910 attr->inherit_stat = 1;
913 if (opts->sample_address) {
914 perf_evsel__set_sample_bit(evsel, ADDR);
915 attr->mmap_data = track;
919 * We don't allow user space callchains for function trace
920 * event, due to issues with page faults while tracing page
921 * fault handler and its overall trickiness nature.
923 if (perf_evsel__is_function_event(evsel))
924 evsel->attr.exclude_callchain_user = 1;
926 if (callchain && callchain->enabled && !evsel->no_aux_samples)
927 perf_evsel__config_callchain(evsel, opts, callchain);
929 if (opts->sample_intr_regs) {
930 attr->sample_regs_intr = opts->sample_intr_regs;
931 perf_evsel__set_sample_bit(evsel, REGS_INTR);
934 if (target__has_cpu(&opts->target) || opts->sample_cpu)
935 perf_evsel__set_sample_bit(evsel, CPU);
938 perf_evsel__set_sample_bit(evsel, PERIOD);
941 * When the user explicitly disabled time don't force it here.
943 if (opts->sample_time &&
944 (!perf_missing_features.sample_id_all &&
945 (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu ||
946 opts->sample_time_set)))
947 perf_evsel__set_sample_bit(evsel, TIME);
949 if (opts->raw_samples && !evsel->no_aux_samples) {
950 perf_evsel__set_sample_bit(evsel, TIME);
951 perf_evsel__set_sample_bit(evsel, RAW);
952 perf_evsel__set_sample_bit(evsel, CPU);
955 if (opts->sample_address)
956 perf_evsel__set_sample_bit(evsel, DATA_SRC);
958 if (opts->sample_phys_addr)
959 perf_evsel__set_sample_bit(evsel, PHYS_ADDR);
961 if (opts->no_buffering) {
963 attr->wakeup_events = 1;
965 if (opts->branch_stack && !evsel->no_aux_samples) {
966 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
967 attr->branch_sample_type = opts->branch_stack;
970 if (opts->sample_weight)
971 perf_evsel__set_sample_bit(evsel, WEIGHT);
975 attr->mmap2 = track && !perf_missing_features.mmap2;
978 if (opts->record_namespaces)
979 attr->namespaces = track;
981 if (opts->record_switch_events)
982 attr->context_switch = track;
984 if (opts->sample_transaction)
985 perf_evsel__set_sample_bit(evsel, TRANSACTION);
987 if (opts->running_time) {
988 evsel->attr.read_format |=
989 PERF_FORMAT_TOTAL_TIME_ENABLED |
990 PERF_FORMAT_TOTAL_TIME_RUNNING;
994 * XXX see the function comment above
996 * Disabling only independent events or group leaders,
997 * keeping group members enabled.
999 if (perf_evsel__is_group_leader(evsel))
1003 * Setting enable_on_exec for independent events and
1004 * group leaders for traced executed by perf.
1006 if (target__none(&opts->target) && perf_evsel__is_group_leader(evsel) &&
1007 !opts->initial_delay)
1008 attr->enable_on_exec = 1;
1010 if (evsel->immediate) {
1012 attr->enable_on_exec = 0;
1015 clockid = opts->clockid;
1016 if (opts->use_clockid) {
1017 attr->use_clockid = 1;
1018 attr->clockid = opts->clockid;
1021 if (evsel->precise_max)
1022 perf_event_attr__set_max_precise_ip(attr);
1024 if (opts->all_user) {
1025 attr->exclude_kernel = 1;
1026 attr->exclude_user = 0;
1029 if (opts->all_kernel) {
1030 attr->exclude_kernel = 0;
1031 attr->exclude_user = 1;
1035 * Apply event specific term settings,
1036 * it overloads any global configuration.
1038 apply_config_terms(evsel, opts);
1040 evsel->ignore_missing_thread = opts->ignore_missing_thread;
1043 static int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
1045 if (evsel->system_wide)
1048 evsel->fd = xyarray__new(ncpus, nthreads, sizeof(int));
1052 for (cpu = 0; cpu < ncpus; cpu++) {
1053 for (thread = 0; thread < nthreads; thread++) {
1054 FD(evsel, cpu, thread) = -1;
1059 return evsel->fd != NULL ? 0 : -ENOMEM;
1062 static int perf_evsel__run_ioctl(struct perf_evsel *evsel,
1067 for (cpu = 0; cpu < xyarray__max_x(evsel->fd); cpu++) {
1068 for (thread = 0; thread < xyarray__max_y(evsel->fd); thread++) {
1069 int fd = FD(evsel, cpu, thread),
1070 err = ioctl(fd, ioc, arg);
1080 int perf_evsel__apply_filter(struct perf_evsel *evsel, const char *filter)
1082 return perf_evsel__run_ioctl(evsel,
1083 PERF_EVENT_IOC_SET_FILTER,
1087 int perf_evsel__set_filter(struct perf_evsel *evsel, const char *filter)
1089 char *new_filter = strdup(filter);
1091 if (new_filter != NULL) {
1092 free(evsel->filter);
1093 evsel->filter = new_filter;
1100 static int perf_evsel__append_filter(struct perf_evsel *evsel,
1101 const char *fmt, const char *filter)
1105 if (evsel->filter == NULL)
1106 return perf_evsel__set_filter(evsel, filter);
1108 if (asprintf(&new_filter, fmt, evsel->filter, filter) > 0) {
1109 free(evsel->filter);
1110 evsel->filter = new_filter;
1117 int perf_evsel__append_tp_filter(struct perf_evsel *evsel, const char *filter)
1119 return perf_evsel__append_filter(evsel, "(%s) && (%s)", filter);
1122 int perf_evsel__append_addr_filter(struct perf_evsel *evsel, const char *filter)
1124 return perf_evsel__append_filter(evsel, "%s,%s", filter);
1127 int perf_evsel__enable(struct perf_evsel *evsel)
1129 return perf_evsel__run_ioctl(evsel,
1130 PERF_EVENT_IOC_ENABLE,
1134 int perf_evsel__disable(struct perf_evsel *evsel)
1136 return perf_evsel__run_ioctl(evsel,
1137 PERF_EVENT_IOC_DISABLE,
1141 int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads)
1143 if (ncpus == 0 || nthreads == 0)
1146 if (evsel->system_wide)
1149 evsel->sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id));
1150 if (evsel->sample_id == NULL)
1153 evsel->id = zalloc(ncpus * nthreads * sizeof(u64));
1154 if (evsel->id == NULL) {
1155 xyarray__delete(evsel->sample_id);
1156 evsel->sample_id = NULL;
1163 static void perf_evsel__free_fd(struct perf_evsel *evsel)
1165 xyarray__delete(evsel->fd);
1169 static void perf_evsel__free_id(struct perf_evsel *evsel)
1171 xyarray__delete(evsel->sample_id);
1172 evsel->sample_id = NULL;
1176 static void perf_evsel__free_config_terms(struct perf_evsel *evsel)
1178 struct perf_evsel_config_term *term, *h;
1180 list_for_each_entry_safe(term, h, &evsel->config_terms, list) {
1181 list_del(&term->list);
1186 void perf_evsel__close_fd(struct perf_evsel *evsel)
1190 for (cpu = 0; cpu < xyarray__max_x(evsel->fd); cpu++)
1191 for (thread = 0; thread < xyarray__max_y(evsel->fd); ++thread) {
1192 close(FD(evsel, cpu, thread));
1193 FD(evsel, cpu, thread) = -1;
1197 void perf_evsel__exit(struct perf_evsel *evsel)
1199 assert(list_empty(&evsel->node));
1200 assert(evsel->evlist == NULL);
1201 perf_evsel__free_fd(evsel);
1202 perf_evsel__free_id(evsel);
1203 perf_evsel__free_config_terms(evsel);
1204 close_cgroup(evsel->cgrp);
1205 cpu_map__put(evsel->cpus);
1206 cpu_map__put(evsel->own_cpus);
1207 thread_map__put(evsel->threads);
1208 zfree(&evsel->group_name);
1209 zfree(&evsel->name);
1210 perf_evsel__object.fini(evsel);
1213 void perf_evsel__delete(struct perf_evsel *evsel)
1215 perf_evsel__exit(evsel);
1219 void perf_evsel__compute_deltas(struct perf_evsel *evsel, int cpu, int thread,
1220 struct perf_counts_values *count)
1222 struct perf_counts_values tmp;
1224 if (!evsel->prev_raw_counts)
1228 tmp = evsel->prev_raw_counts->aggr;
1229 evsel->prev_raw_counts->aggr = *count;
1231 tmp = *perf_counts(evsel->prev_raw_counts, cpu, thread);
1232 *perf_counts(evsel->prev_raw_counts, cpu, thread) = *count;
1235 count->val = count->val - tmp.val;
1236 count->ena = count->ena - tmp.ena;
1237 count->run = count->run - tmp.run;
1240 void perf_counts_values__scale(struct perf_counts_values *count,
1241 bool scale, s8 *pscaled)
1246 if (count->run == 0) {
1249 } else if (count->run < count->ena) {
1251 count->val = (u64)((double) count->val * count->ena / count->run + 0.5);
1254 count->ena = count->run = 0;
1260 static int perf_evsel__read_size(struct perf_evsel *evsel)
1262 u64 read_format = evsel->attr.read_format;
1263 int entry = sizeof(u64); /* value */
1267 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1268 size += sizeof(u64);
1270 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1271 size += sizeof(u64);
1273 if (read_format & PERF_FORMAT_ID)
1274 entry += sizeof(u64);
1276 if (read_format & PERF_FORMAT_GROUP) {
1277 nr = evsel->nr_members;
1278 size += sizeof(u64);
1285 int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread,
1286 struct perf_counts_values *count)
1288 size_t size = perf_evsel__read_size(evsel);
1290 memset(count, 0, sizeof(*count));
1292 if (FD(evsel, cpu, thread) < 0)
1295 if (readn(FD(evsel, cpu, thread), count->values, size) <= 0)
1302 perf_evsel__read_one(struct perf_evsel *evsel, int cpu, int thread)
1304 struct perf_counts_values *count = perf_counts(evsel->counts, cpu, thread);
1306 return perf_evsel__read(evsel, cpu, thread, count);
1310 perf_evsel__set_count(struct perf_evsel *counter, int cpu, int thread,
1311 u64 val, u64 ena, u64 run)
1313 struct perf_counts_values *count;
1315 count = perf_counts(counter->counts, cpu, thread);
1320 count->loaded = true;
1324 perf_evsel__process_group_data(struct perf_evsel *leader,
1325 int cpu, int thread, u64 *data)
1327 u64 read_format = leader->attr.read_format;
1328 struct sample_read_value *v;
1329 u64 nr, ena = 0, run = 0, i;
1333 if (nr != (u64) leader->nr_members)
1336 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1339 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1342 v = (struct sample_read_value *) data;
1344 perf_evsel__set_count(leader, cpu, thread,
1345 v[0].value, ena, run);
1347 for (i = 1; i < nr; i++) {
1348 struct perf_evsel *counter;
1350 counter = perf_evlist__id2evsel(leader->evlist, v[i].id);
1354 perf_evsel__set_count(counter, cpu, thread,
1355 v[i].value, ena, run);
1362 perf_evsel__read_group(struct perf_evsel *leader, int cpu, int thread)
1364 struct perf_stat_evsel *ps = leader->priv;
1365 u64 read_format = leader->attr.read_format;
1366 int size = perf_evsel__read_size(leader);
1367 u64 *data = ps->group_data;
1369 if (!(read_format & PERF_FORMAT_ID))
1372 if (!perf_evsel__is_group_leader(leader))
1376 data = zalloc(size);
1380 ps->group_data = data;
1383 if (FD(leader, cpu, thread) < 0)
1386 if (readn(FD(leader, cpu, thread), data, size) <= 0)
1389 return perf_evsel__process_group_data(leader, cpu, thread, data);
1392 int perf_evsel__read_counter(struct perf_evsel *evsel, int cpu, int thread)
1394 u64 read_format = evsel->attr.read_format;
1396 if (read_format & PERF_FORMAT_GROUP)
1397 return perf_evsel__read_group(evsel, cpu, thread);
1399 return perf_evsel__read_one(evsel, cpu, thread);
1402 int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
1403 int cpu, int thread, bool scale)
1405 struct perf_counts_values count;
1406 size_t nv = scale ? 3 : 1;
1408 if (FD(evsel, cpu, thread) < 0)
1411 if (evsel->counts == NULL && perf_evsel__alloc_counts(evsel, cpu + 1, thread + 1) < 0)
1414 if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) <= 0)
1417 perf_evsel__compute_deltas(evsel, cpu, thread, &count);
1418 perf_counts_values__scale(&count, scale, NULL);
1419 *perf_counts(evsel->counts, cpu, thread) = count;
1423 static int get_group_fd(struct perf_evsel *evsel, int cpu, int thread)
1425 struct perf_evsel *leader = evsel->leader;
1428 if (perf_evsel__is_group_leader(evsel))
1432 * Leader must be already processed/open,
1433 * if not it's a bug.
1435 BUG_ON(!leader->fd);
1437 fd = FD(leader, cpu, thread);
1448 static void __p_bits(char *buf, size_t size, u64 value, struct bit_names *bits)
1450 bool first_bit = true;
1454 if (value & bits[i].bit) {
1455 buf += scnprintf(buf, size, "%s%s", first_bit ? "" : "|", bits[i].name);
1458 } while (bits[++i].name != NULL);
1461 static void __p_sample_type(char *buf, size_t size, u64 value)
1463 #define bit_name(n) { PERF_SAMPLE_##n, #n }
1464 struct bit_names bits[] = {
1465 bit_name(IP), bit_name(TID), bit_name(TIME), bit_name(ADDR),
1466 bit_name(READ), bit_name(CALLCHAIN), bit_name(ID), bit_name(CPU),
1467 bit_name(PERIOD), bit_name(STREAM_ID), bit_name(RAW),
1468 bit_name(BRANCH_STACK), bit_name(REGS_USER), bit_name(STACK_USER),
1469 bit_name(IDENTIFIER), bit_name(REGS_INTR), bit_name(DATA_SRC),
1470 bit_name(WEIGHT), bit_name(PHYS_ADDR),
1474 __p_bits(buf, size, value, bits);
1477 static void __p_branch_sample_type(char *buf, size_t size, u64 value)
1479 #define bit_name(n) { PERF_SAMPLE_BRANCH_##n, #n }
1480 struct bit_names bits[] = {
1481 bit_name(USER), bit_name(KERNEL), bit_name(HV), bit_name(ANY),
1482 bit_name(ANY_CALL), bit_name(ANY_RETURN), bit_name(IND_CALL),
1483 bit_name(ABORT_TX), bit_name(IN_TX), bit_name(NO_TX),
1484 bit_name(COND), bit_name(CALL_STACK), bit_name(IND_JUMP),
1485 bit_name(CALL), bit_name(NO_FLAGS), bit_name(NO_CYCLES),
1489 __p_bits(buf, size, value, bits);
1492 static void __p_read_format(char *buf, size_t size, u64 value)
1494 #define bit_name(n) { PERF_FORMAT_##n, #n }
1495 struct bit_names bits[] = {
1496 bit_name(TOTAL_TIME_ENABLED), bit_name(TOTAL_TIME_RUNNING),
1497 bit_name(ID), bit_name(GROUP),
1501 __p_bits(buf, size, value, bits);
1504 #define BUF_SIZE 1024
1506 #define p_hex(val) snprintf(buf, BUF_SIZE, "%#"PRIx64, (uint64_t)(val))
1507 #define p_unsigned(val) snprintf(buf, BUF_SIZE, "%"PRIu64, (uint64_t)(val))
1508 #define p_signed(val) snprintf(buf, BUF_SIZE, "%"PRId64, (int64_t)(val))
1509 #define p_sample_type(val) __p_sample_type(buf, BUF_SIZE, val)
1510 #define p_branch_sample_type(val) __p_branch_sample_type(buf, BUF_SIZE, val)
1511 #define p_read_format(val) __p_read_format(buf, BUF_SIZE, val)
1513 #define PRINT_ATTRn(_n, _f, _p) \
1517 ret += attr__fprintf(fp, _n, buf, priv);\
1521 #define PRINT_ATTRf(_f, _p) PRINT_ATTRn(#_f, _f, _p)
1523 int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
1524 attr__fprintf_f attr__fprintf, void *priv)
1529 PRINT_ATTRf(type, p_unsigned);
1530 PRINT_ATTRf(size, p_unsigned);
1531 PRINT_ATTRf(config, p_hex);
1532 PRINT_ATTRn("{ sample_period, sample_freq }", sample_period, p_unsigned);
1533 PRINT_ATTRf(sample_type, p_sample_type);
1534 PRINT_ATTRf(read_format, p_read_format);
1536 PRINT_ATTRf(disabled, p_unsigned);
1537 PRINT_ATTRf(inherit, p_unsigned);
1538 PRINT_ATTRf(pinned, p_unsigned);
1539 PRINT_ATTRf(exclusive, p_unsigned);
1540 PRINT_ATTRf(exclude_user, p_unsigned);
1541 PRINT_ATTRf(exclude_kernel, p_unsigned);
1542 PRINT_ATTRf(exclude_hv, p_unsigned);
1543 PRINT_ATTRf(exclude_idle, p_unsigned);
1544 PRINT_ATTRf(mmap, p_unsigned);
1545 PRINT_ATTRf(comm, p_unsigned);
1546 PRINT_ATTRf(freq, p_unsigned);
1547 PRINT_ATTRf(inherit_stat, p_unsigned);
1548 PRINT_ATTRf(enable_on_exec, p_unsigned);
1549 PRINT_ATTRf(task, p_unsigned);
1550 PRINT_ATTRf(watermark, p_unsigned);
1551 PRINT_ATTRf(precise_ip, p_unsigned);
1552 PRINT_ATTRf(mmap_data, p_unsigned);
1553 PRINT_ATTRf(sample_id_all, p_unsigned);
1554 PRINT_ATTRf(exclude_host, p_unsigned);
1555 PRINT_ATTRf(exclude_guest, p_unsigned);
1556 PRINT_ATTRf(exclude_callchain_kernel, p_unsigned);
1557 PRINT_ATTRf(exclude_callchain_user, p_unsigned);
1558 PRINT_ATTRf(mmap2, p_unsigned);
1559 PRINT_ATTRf(comm_exec, p_unsigned);
1560 PRINT_ATTRf(use_clockid, p_unsigned);
1561 PRINT_ATTRf(context_switch, p_unsigned);
1562 PRINT_ATTRf(write_backward, p_unsigned);
1564 PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned);
1565 PRINT_ATTRf(bp_type, p_unsigned);
1566 PRINT_ATTRn("{ bp_addr, config1 }", bp_addr, p_hex);
1567 PRINT_ATTRn("{ bp_len, config2 }", bp_len, p_hex);
1568 PRINT_ATTRf(branch_sample_type, p_branch_sample_type);
1569 PRINT_ATTRf(sample_regs_user, p_hex);
1570 PRINT_ATTRf(sample_stack_user, p_unsigned);
1571 PRINT_ATTRf(clockid, p_signed);
1572 PRINT_ATTRf(sample_regs_intr, p_hex);
1573 PRINT_ATTRf(aux_watermark, p_unsigned);
1574 PRINT_ATTRf(sample_max_stack, p_unsigned);
1579 static int __open_attr__fprintf(FILE *fp, const char *name, const char *val,
1580 void *priv __maybe_unused)
1582 return fprintf(fp, " %-32s %s\n", name, val);
1585 static bool ignore_missing_thread(struct perf_evsel *evsel,
1586 struct thread_map *threads,
1587 int thread, int err)
1589 if (!evsel->ignore_missing_thread)
1592 /* The system wide setup does not work with threads. */
1593 if (evsel->system_wide)
1596 /* The -ESRCH is perf event syscall errno for pid's not found. */
1600 /* If there's only one thread, let it fail. */
1601 if (threads->nr == 1)
1604 if (thread_map__remove(threads, thread))
1607 pr_warning("WARNING: Ignored open failure for pid %d\n",
1608 thread_map__pid(threads, thread));
1612 int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
1613 struct thread_map *threads)
1615 int cpu, thread, nthreads;
1616 unsigned long flags = PERF_FLAG_FD_CLOEXEC;
1618 enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE;
1620 if (perf_missing_features.write_backward && evsel->attr.write_backward)
1624 static struct cpu_map *empty_cpu_map;
1626 if (empty_cpu_map == NULL) {
1627 empty_cpu_map = cpu_map__dummy_new();
1628 if (empty_cpu_map == NULL)
1632 cpus = empty_cpu_map;
1635 if (threads == NULL) {
1636 static struct thread_map *empty_thread_map;
1638 if (empty_thread_map == NULL) {
1639 empty_thread_map = thread_map__new_by_tid(-1);
1640 if (empty_thread_map == NULL)
1644 threads = empty_thread_map;
1647 if (evsel->system_wide)
1650 nthreads = threads->nr;
1652 if (evsel->fd == NULL &&
1653 perf_evsel__alloc_fd(evsel, cpus->nr, nthreads) < 0)
1657 flags |= PERF_FLAG_PID_CGROUP;
1658 pid = evsel->cgrp->fd;
1661 fallback_missing_features:
1662 if (perf_missing_features.clockid_wrong)
1663 evsel->attr.clockid = CLOCK_MONOTONIC; /* should always work */
1664 if (perf_missing_features.clockid) {
1665 evsel->attr.use_clockid = 0;
1666 evsel->attr.clockid = 0;
1668 if (perf_missing_features.cloexec)
1669 flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC;
1670 if (perf_missing_features.mmap2)
1671 evsel->attr.mmap2 = 0;
1672 if (perf_missing_features.exclude_guest)
1673 evsel->attr.exclude_guest = evsel->attr.exclude_host = 0;
1674 if (perf_missing_features.lbr_flags)
1675 evsel->attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS |
1676 PERF_SAMPLE_BRANCH_NO_CYCLES);
1677 if (perf_missing_features.group_read && evsel->attr.inherit)
1678 evsel->attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID);
1680 if (perf_missing_features.sample_id_all)
1681 evsel->attr.sample_id_all = 0;
1684 fprintf(stderr, "%.60s\n", graph_dotted_line);
1685 fprintf(stderr, "perf_event_attr:\n");
1686 perf_event_attr__fprintf(stderr, &evsel->attr, __open_attr__fprintf, NULL);
1687 fprintf(stderr, "%.60s\n", graph_dotted_line);
1690 for (cpu = 0; cpu < cpus->nr; cpu++) {
1692 for (thread = 0; thread < nthreads; thread++) {
1695 if (!evsel->cgrp && !evsel->system_wide)
1696 pid = thread_map__pid(threads, thread);
1698 group_fd = get_group_fd(evsel, cpu, thread);
1700 pr_debug2("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx",
1701 pid, cpus->map[cpu], group_fd, flags);
1705 fd = sys_perf_event_open(&evsel->attr, pid, cpus->map[cpu],
1708 FD(evsel, cpu, thread) = fd;
1713 if (ignore_missing_thread(evsel, threads, thread, err)) {
1715 * We just removed 1 thread, so take a step
1716 * back on thread index and lower the upper
1722 /* ... and pretend like nothing have happened. */
1727 pr_debug2("\nsys_perf_event_open failed, error %d\n",
1732 pr_debug2(" = %d\n", fd);
1734 if (evsel->bpf_fd >= 0) {
1736 int bpf_fd = evsel->bpf_fd;
1739 PERF_EVENT_IOC_SET_BPF,
1741 if (err && errno != EEXIST) {
1742 pr_err("failed to attach bpf fd %d: %s\n",
1743 bpf_fd, strerror(errno));
1749 set_rlimit = NO_CHANGE;
1752 * If we succeeded but had to kill clockid, fail and
1753 * have perf_evsel__open_strerror() print us a nice
1756 if (perf_missing_features.clockid ||
1757 perf_missing_features.clockid_wrong) {
1768 * perf stat needs between 5 and 22 fds per CPU. When we run out
1769 * of them try to increase the limits.
1771 if (err == -EMFILE && set_rlimit < INCREASED_MAX) {
1773 int old_errno = errno;
1775 if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
1776 if (set_rlimit == NO_CHANGE)
1777 l.rlim_cur = l.rlim_max;
1779 l.rlim_cur = l.rlim_max + 1000;
1780 l.rlim_max = l.rlim_cur;
1782 if (setrlimit(RLIMIT_NOFILE, &l) == 0) {
1791 if (err != -EINVAL || cpu > 0 || thread > 0)
1795 * Must probe features in the order they were added to the
1796 * perf_event_attr interface.
1798 if (!perf_missing_features.write_backward && evsel->attr.write_backward) {
1799 perf_missing_features.write_backward = true;
1800 pr_debug2("switching off write_backward\n");
1802 } else if (!perf_missing_features.clockid_wrong && evsel->attr.use_clockid) {
1803 perf_missing_features.clockid_wrong = true;
1804 pr_debug2("switching off clockid\n");
1805 goto fallback_missing_features;
1806 } else if (!perf_missing_features.clockid && evsel->attr.use_clockid) {
1807 perf_missing_features.clockid = true;
1808 pr_debug2("switching off use_clockid\n");
1809 goto fallback_missing_features;
1810 } else if (!perf_missing_features.cloexec && (flags & PERF_FLAG_FD_CLOEXEC)) {
1811 perf_missing_features.cloexec = true;
1812 pr_debug2("switching off cloexec flag\n");
1813 goto fallback_missing_features;
1814 } else if (!perf_missing_features.mmap2 && evsel->attr.mmap2) {
1815 perf_missing_features.mmap2 = true;
1816 pr_debug2("switching off mmap2\n");
1817 goto fallback_missing_features;
1818 } else if (!perf_missing_features.exclude_guest &&
1819 (evsel->attr.exclude_guest || evsel->attr.exclude_host)) {
1820 perf_missing_features.exclude_guest = true;
1821 pr_debug2("switching off exclude_guest, exclude_host\n");
1822 goto fallback_missing_features;
1823 } else if (!perf_missing_features.sample_id_all) {
1824 perf_missing_features.sample_id_all = true;
1825 pr_debug2("switching off sample_id_all\n");
1826 goto retry_sample_id;
1827 } else if (!perf_missing_features.lbr_flags &&
1828 (evsel->attr.branch_sample_type &
1829 (PERF_SAMPLE_BRANCH_NO_CYCLES |
1830 PERF_SAMPLE_BRANCH_NO_FLAGS))) {
1831 perf_missing_features.lbr_flags = true;
1832 pr_debug2("switching off branch sample type no (cycles/flags)\n");
1833 goto fallback_missing_features;
1834 } else if (!perf_missing_features.group_read &&
1835 evsel->attr.inherit &&
1836 (evsel->attr.read_format & PERF_FORMAT_GROUP)) {
1837 perf_missing_features.group_read = true;
1838 pr_debug2("switching off group read\n");
1839 goto fallback_missing_features;
1843 while (--thread >= 0) {
1844 close(FD(evsel, cpu, thread));
1845 FD(evsel, cpu, thread) = -1;
1848 } while (--cpu >= 0);
1852 void perf_evsel__close(struct perf_evsel *evsel)
1854 if (evsel->fd == NULL)
1857 perf_evsel__close_fd(evsel);
1858 perf_evsel__free_fd(evsel);
1861 int perf_evsel__open_per_cpu(struct perf_evsel *evsel,
1862 struct cpu_map *cpus)
1864 return perf_evsel__open(evsel, cpus, NULL);
1867 int perf_evsel__open_per_thread(struct perf_evsel *evsel,
1868 struct thread_map *threads)
1870 return perf_evsel__open(evsel, NULL, threads);
1873 static int perf_evsel__parse_id_sample(const struct perf_evsel *evsel,
1874 const union perf_event *event,
1875 struct perf_sample *sample)
1877 u64 type = evsel->attr.sample_type;
1878 const u64 *array = event->sample.array;
1879 bool swapped = evsel->needs_swap;
1882 array += ((event->header.size -
1883 sizeof(event->header)) / sizeof(u64)) - 1;
1885 if (type & PERF_SAMPLE_IDENTIFIER) {
1886 sample->id = *array;
1890 if (type & PERF_SAMPLE_CPU) {
1893 /* undo swap of u64, then swap on individual u32s */
1894 u.val64 = bswap_64(u.val64);
1895 u.val32[0] = bswap_32(u.val32[0]);
1898 sample->cpu = u.val32[0];
1902 if (type & PERF_SAMPLE_STREAM_ID) {
1903 sample->stream_id = *array;
1907 if (type & PERF_SAMPLE_ID) {
1908 sample->id = *array;
1912 if (type & PERF_SAMPLE_TIME) {
1913 sample->time = *array;
1917 if (type & PERF_SAMPLE_TID) {
1920 /* undo swap of u64, then swap on individual u32s */
1921 u.val64 = bswap_64(u.val64);
1922 u.val32[0] = bswap_32(u.val32[0]);
1923 u.val32[1] = bswap_32(u.val32[1]);
1926 sample->pid = u.val32[0];
1927 sample->tid = u.val32[1];
1934 static inline bool overflow(const void *endp, u16 max_size, const void *offset,
1937 return size > max_size || offset + size > endp;
1940 #define OVERFLOW_CHECK(offset, size, max_size) \
1942 if (overflow(endp, (max_size), (offset), (size))) \
1946 #define OVERFLOW_CHECK_u64(offset) \
1947 OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64))
1949 int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event,
1950 struct perf_sample *data)
1952 u64 type = evsel->attr.sample_type;
1953 bool swapped = evsel->needs_swap;
1955 u16 max_size = event->header.size;
1956 const void *endp = (void *)event + max_size;
1960 * used for cross-endian analysis. See git commit 65014ab3
1961 * for why this goofiness is needed.
1965 memset(data, 0, sizeof(*data));
1966 data->cpu = data->pid = data->tid = -1;
1967 data->stream_id = data->id = data->time = -1ULL;
1968 data->period = evsel->attr.sample_period;
1969 data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1971 if (event->header.type != PERF_RECORD_SAMPLE) {
1972 if (!evsel->attr.sample_id_all)
1974 return perf_evsel__parse_id_sample(evsel, event, data);
1977 array = event->sample.array;
1980 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes
1981 * up to PERF_SAMPLE_PERIOD. After that overflow() must be used to
1982 * check the format does not go past the end of the event.
1984 if (evsel->sample_size + sizeof(event->header) > event->header.size)
1988 if (type & PERF_SAMPLE_IDENTIFIER) {
1993 if (type & PERF_SAMPLE_IP) {
1998 if (type & PERF_SAMPLE_TID) {
2001 /* undo swap of u64, then swap on individual u32s */
2002 u.val64 = bswap_64(u.val64);
2003 u.val32[0] = bswap_32(u.val32[0]);
2004 u.val32[1] = bswap_32(u.val32[1]);
2007 data->pid = u.val32[0];
2008 data->tid = u.val32[1];
2012 if (type & PERF_SAMPLE_TIME) {
2013 data->time = *array;
2018 if (type & PERF_SAMPLE_ADDR) {
2019 data->addr = *array;
2023 if (type & PERF_SAMPLE_ID) {
2028 if (type & PERF_SAMPLE_STREAM_ID) {
2029 data->stream_id = *array;
2033 if (type & PERF_SAMPLE_CPU) {
2037 /* undo swap of u64, then swap on individual u32s */
2038 u.val64 = bswap_64(u.val64);
2039 u.val32[0] = bswap_32(u.val32[0]);
2042 data->cpu = u.val32[0];
2046 if (type & PERF_SAMPLE_PERIOD) {
2047 data->period = *array;
2051 if (type & PERF_SAMPLE_READ) {
2052 u64 read_format = evsel->attr.read_format;
2054 OVERFLOW_CHECK_u64(array);
2055 if (read_format & PERF_FORMAT_GROUP)
2056 data->read.group.nr = *array;
2058 data->read.one.value = *array;
2062 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
2063 OVERFLOW_CHECK_u64(array);
2064 data->read.time_enabled = *array;
2068 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
2069 OVERFLOW_CHECK_u64(array);
2070 data->read.time_running = *array;
2074 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
2075 if (read_format & PERF_FORMAT_GROUP) {
2076 const u64 max_group_nr = UINT64_MAX /
2077 sizeof(struct sample_read_value);
2079 if (data->read.group.nr > max_group_nr)
2081 sz = data->read.group.nr *
2082 sizeof(struct sample_read_value);
2083 OVERFLOW_CHECK(array, sz, max_size);
2084 data->read.group.values =
2085 (struct sample_read_value *)array;
2086 array = (void *)array + sz;
2088 OVERFLOW_CHECK_u64(array);
2089 data->read.one.id = *array;
2094 if (type & PERF_SAMPLE_CALLCHAIN) {
2095 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64);
2097 OVERFLOW_CHECK_u64(array);
2098 data->callchain = (struct ip_callchain *)array++;
2099 if (data->callchain->nr > max_callchain_nr)
2101 sz = data->callchain->nr * sizeof(u64);
2102 OVERFLOW_CHECK(array, sz, max_size);
2103 array = (void *)array + sz;
2106 if (type & PERF_SAMPLE_RAW) {
2107 OVERFLOW_CHECK_u64(array);
2109 if (WARN_ONCE(swapped,
2110 "Endianness of raw data not corrected!\n")) {
2111 /* undo swap of u64, then swap on individual u32s */
2112 u.val64 = bswap_64(u.val64);
2113 u.val32[0] = bswap_32(u.val32[0]);
2114 u.val32[1] = bswap_32(u.val32[1]);
2116 data->raw_size = u.val32[0];
2117 array = (void *)array + sizeof(u32);
2119 OVERFLOW_CHECK(array, data->raw_size, max_size);
2120 data->raw_data = (void *)array;
2121 array = (void *)array + data->raw_size;
2124 if (type & PERF_SAMPLE_BRANCH_STACK) {
2125 const u64 max_branch_nr = UINT64_MAX /
2126 sizeof(struct branch_entry);
2128 OVERFLOW_CHECK_u64(array);
2129 data->branch_stack = (struct branch_stack *)array++;
2131 if (data->branch_stack->nr > max_branch_nr)
2133 sz = data->branch_stack->nr * sizeof(struct branch_entry);
2134 OVERFLOW_CHECK(array, sz, max_size);
2135 array = (void *)array + sz;
2138 if (type & PERF_SAMPLE_REGS_USER) {
2139 OVERFLOW_CHECK_u64(array);
2140 data->user_regs.abi = *array;
2143 if (data->user_regs.abi) {
2144 u64 mask = evsel->attr.sample_regs_user;
2146 sz = hweight_long(mask) * sizeof(u64);
2147 OVERFLOW_CHECK(array, sz, max_size);
2148 data->user_regs.mask = mask;
2149 data->user_regs.regs = (u64 *)array;
2150 array = (void *)array + sz;
2154 if (type & PERF_SAMPLE_STACK_USER) {
2155 OVERFLOW_CHECK_u64(array);
2158 data->user_stack.offset = ((char *)(array - 1)
2162 data->user_stack.size = 0;
2164 OVERFLOW_CHECK(array, sz, max_size);
2165 data->user_stack.data = (char *)array;
2166 array = (void *)array + sz;
2167 OVERFLOW_CHECK_u64(array);
2168 data->user_stack.size = *array++;
2169 if (WARN_ONCE(data->user_stack.size > sz,
2170 "user stack dump failure\n"))
2175 if (type & PERF_SAMPLE_WEIGHT) {
2176 OVERFLOW_CHECK_u64(array);
2177 data->weight = *array;
2181 data->data_src = PERF_MEM_DATA_SRC_NONE;
2182 if (type & PERF_SAMPLE_DATA_SRC) {
2183 OVERFLOW_CHECK_u64(array);
2184 data->data_src = *array;
2188 data->transaction = 0;
2189 if (type & PERF_SAMPLE_TRANSACTION) {
2190 OVERFLOW_CHECK_u64(array);
2191 data->transaction = *array;
2195 data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE;
2196 if (type & PERF_SAMPLE_REGS_INTR) {
2197 OVERFLOW_CHECK_u64(array);
2198 data->intr_regs.abi = *array;
2201 if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) {
2202 u64 mask = evsel->attr.sample_regs_intr;
2204 sz = hweight_long(mask) * sizeof(u64);
2205 OVERFLOW_CHECK(array, sz, max_size);
2206 data->intr_regs.mask = mask;
2207 data->intr_regs.regs = (u64 *)array;
2208 array = (void *)array + sz;
2212 data->phys_addr = 0;
2213 if (type & PERF_SAMPLE_PHYS_ADDR) {
2214 data->phys_addr = *array;
2221 size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type,
2224 size_t sz, result = sizeof(struct sample_event);
2226 if (type & PERF_SAMPLE_IDENTIFIER)
2227 result += sizeof(u64);
2229 if (type & PERF_SAMPLE_IP)
2230 result += sizeof(u64);
2232 if (type & PERF_SAMPLE_TID)
2233 result += sizeof(u64);
2235 if (type & PERF_SAMPLE_TIME)
2236 result += sizeof(u64);
2238 if (type & PERF_SAMPLE_ADDR)
2239 result += sizeof(u64);
2241 if (type & PERF_SAMPLE_ID)
2242 result += sizeof(u64);
2244 if (type & PERF_SAMPLE_STREAM_ID)
2245 result += sizeof(u64);
2247 if (type & PERF_SAMPLE_CPU)
2248 result += sizeof(u64);
2250 if (type & PERF_SAMPLE_PERIOD)
2251 result += sizeof(u64);
2253 if (type & PERF_SAMPLE_READ) {
2254 result += sizeof(u64);
2255 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
2256 result += sizeof(u64);
2257 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
2258 result += sizeof(u64);
2259 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
2260 if (read_format & PERF_FORMAT_GROUP) {
2261 sz = sample->read.group.nr *
2262 sizeof(struct sample_read_value);
2265 result += sizeof(u64);
2269 if (type & PERF_SAMPLE_CALLCHAIN) {
2270 sz = (sample->callchain->nr + 1) * sizeof(u64);
2274 if (type & PERF_SAMPLE_RAW) {
2275 result += sizeof(u32);
2276 result += sample->raw_size;
2279 if (type & PERF_SAMPLE_BRANCH_STACK) {
2280 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
2285 if (type & PERF_SAMPLE_REGS_USER) {
2286 if (sample->user_regs.abi) {
2287 result += sizeof(u64);
2288 sz = hweight_long(sample->user_regs.mask) * sizeof(u64);
2291 result += sizeof(u64);
2295 if (type & PERF_SAMPLE_STACK_USER) {
2296 sz = sample->user_stack.size;
2297 result += sizeof(u64);
2300 result += sizeof(u64);
2304 if (type & PERF_SAMPLE_WEIGHT)
2305 result += sizeof(u64);
2307 if (type & PERF_SAMPLE_DATA_SRC)
2308 result += sizeof(u64);
2310 if (type & PERF_SAMPLE_TRANSACTION)
2311 result += sizeof(u64);
2313 if (type & PERF_SAMPLE_REGS_INTR) {
2314 if (sample->intr_regs.abi) {
2315 result += sizeof(u64);
2316 sz = hweight_long(sample->intr_regs.mask) * sizeof(u64);
2319 result += sizeof(u64);
2323 if (type & PERF_SAMPLE_PHYS_ADDR)
2324 result += sizeof(u64);
2329 int perf_event__synthesize_sample(union perf_event *event, u64 type,
2331 const struct perf_sample *sample,
2337 * used for cross-endian analysis. See git commit 65014ab3
2338 * for why this goofiness is needed.
2342 array = event->sample.array;
2344 if (type & PERF_SAMPLE_IDENTIFIER) {
2345 *array = sample->id;
2349 if (type & PERF_SAMPLE_IP) {
2350 *array = sample->ip;
2354 if (type & PERF_SAMPLE_TID) {
2355 u.val32[0] = sample->pid;
2356 u.val32[1] = sample->tid;
2359 * Inverse of what is done in perf_evsel__parse_sample
2361 u.val32[0] = bswap_32(u.val32[0]);
2362 u.val32[1] = bswap_32(u.val32[1]);
2363 u.val64 = bswap_64(u.val64);
2370 if (type & PERF_SAMPLE_TIME) {
2371 *array = sample->time;
2375 if (type & PERF_SAMPLE_ADDR) {
2376 *array = sample->addr;
2380 if (type & PERF_SAMPLE_ID) {
2381 *array = sample->id;
2385 if (type & PERF_SAMPLE_STREAM_ID) {
2386 *array = sample->stream_id;
2390 if (type & PERF_SAMPLE_CPU) {
2391 u.val32[0] = sample->cpu;
2394 * Inverse of what is done in perf_evsel__parse_sample
2396 u.val32[0] = bswap_32(u.val32[0]);
2397 u.val64 = bswap_64(u.val64);
2403 if (type & PERF_SAMPLE_PERIOD) {
2404 *array = sample->period;
2408 if (type & PERF_SAMPLE_READ) {
2409 if (read_format & PERF_FORMAT_GROUP)
2410 *array = sample->read.group.nr;
2412 *array = sample->read.one.value;
2415 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
2416 *array = sample->read.time_enabled;
2420 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
2421 *array = sample->read.time_running;
2425 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
2426 if (read_format & PERF_FORMAT_GROUP) {
2427 sz = sample->read.group.nr *
2428 sizeof(struct sample_read_value);
2429 memcpy(array, sample->read.group.values, sz);
2430 array = (void *)array + sz;
2432 *array = sample->read.one.id;
2437 if (type & PERF_SAMPLE_CALLCHAIN) {
2438 sz = (sample->callchain->nr + 1) * sizeof(u64);
2439 memcpy(array, sample->callchain, sz);
2440 array = (void *)array + sz;
2443 if (type & PERF_SAMPLE_RAW) {
2444 u.val32[0] = sample->raw_size;
2445 if (WARN_ONCE(swapped,
2446 "Endianness of raw data not corrected!\n")) {
2448 * Inverse of what is done in perf_evsel__parse_sample
2450 u.val32[0] = bswap_32(u.val32[0]);
2451 u.val32[1] = bswap_32(u.val32[1]);
2452 u.val64 = bswap_64(u.val64);
2455 array = (void *)array + sizeof(u32);
2457 memcpy(array, sample->raw_data, sample->raw_size);
2458 array = (void *)array + sample->raw_size;
2461 if (type & PERF_SAMPLE_BRANCH_STACK) {
2462 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
2464 memcpy(array, sample->branch_stack, sz);
2465 array = (void *)array + sz;
2468 if (type & PERF_SAMPLE_REGS_USER) {
2469 if (sample->user_regs.abi) {
2470 *array++ = sample->user_regs.abi;
2471 sz = hweight_long(sample->user_regs.mask) * sizeof(u64);
2472 memcpy(array, sample->user_regs.regs, sz);
2473 array = (void *)array + sz;
2479 if (type & PERF_SAMPLE_STACK_USER) {
2480 sz = sample->user_stack.size;
2483 memcpy(array, sample->user_stack.data, sz);
2484 array = (void *)array + sz;
2489 if (type & PERF_SAMPLE_WEIGHT) {
2490 *array = sample->weight;
2494 if (type & PERF_SAMPLE_DATA_SRC) {
2495 *array = sample->data_src;
2499 if (type & PERF_SAMPLE_TRANSACTION) {
2500 *array = sample->transaction;
2504 if (type & PERF_SAMPLE_REGS_INTR) {
2505 if (sample->intr_regs.abi) {
2506 *array++ = sample->intr_regs.abi;
2507 sz = hweight_long(sample->intr_regs.mask) * sizeof(u64);
2508 memcpy(array, sample->intr_regs.regs, sz);
2509 array = (void *)array + sz;
2515 if (type & PERF_SAMPLE_PHYS_ADDR) {
2516 *array = sample->phys_addr;
2523 struct format_field *perf_evsel__field(struct perf_evsel *evsel, const char *name)
2525 return pevent_find_field(evsel->tp_format, name);
2528 void *perf_evsel__rawptr(struct perf_evsel *evsel, struct perf_sample *sample,
2531 struct format_field *field = perf_evsel__field(evsel, name);
2537 offset = field->offset;
2539 if (field->flags & FIELD_IS_DYNAMIC) {
2540 offset = *(int *)(sample->raw_data + field->offset);
2544 return sample->raw_data + offset;
2547 u64 format_field__intval(struct format_field *field, struct perf_sample *sample,
2551 void *ptr = sample->raw_data + field->offset;
2553 switch (field->size) {
2557 value = *(u16 *)ptr;
2560 value = *(u32 *)ptr;
2563 memcpy(&value, ptr, sizeof(u64));
2572 switch (field->size) {
2574 return bswap_16(value);
2576 return bswap_32(value);
2578 return bswap_64(value);
2586 u64 perf_evsel__intval(struct perf_evsel *evsel, struct perf_sample *sample,
2589 struct format_field *field = perf_evsel__field(evsel, name);
2594 return field ? format_field__intval(field, sample, evsel->needs_swap) : 0;
2597 bool perf_evsel__fallback(struct perf_evsel *evsel, int err,
2598 char *msg, size_t msgsize)
2602 if ((err == ENOENT || err == ENXIO || err == ENODEV) &&
2603 evsel->attr.type == PERF_TYPE_HARDWARE &&
2604 evsel->attr.config == PERF_COUNT_HW_CPU_CYCLES) {
2606 * If it's cycles then fall back to hrtimer based
2607 * cpu-clock-tick sw counter, which is always available even if
2610 * PPC returns ENXIO until 2.6.37 (behavior changed with commit
2613 scnprintf(msg, msgsize, "%s",
2614 "The cycles event is not supported, trying to fall back to cpu-clock-ticks");
2616 evsel->attr.type = PERF_TYPE_SOFTWARE;
2617 evsel->attr.config = PERF_COUNT_SW_CPU_CLOCK;
2619 zfree(&evsel->name);
2621 } else if (err == EACCES && !evsel->attr.exclude_kernel &&
2622 (paranoid = perf_event_paranoid()) > 1) {
2623 const char *name = perf_evsel__name(evsel);
2626 if (asprintf(&new_name, "%s%su", name, strchr(name, ':') ? "" : ":") < 0)
2631 evsel->name = new_name;
2632 scnprintf(msg, msgsize,
2633 "kernel.perf_event_paranoid=%d, trying to fall back to excluding kernel samples", paranoid);
2634 evsel->attr.exclude_kernel = 1;
2642 static bool find_process(const char *name)
2644 size_t len = strlen(name);
2649 dir = opendir(procfs__mountpoint());
2653 /* Walk through the directory. */
2654 while (ret && (d = readdir(dir)) != NULL) {
2655 char path[PATH_MAX];
2659 if ((d->d_type != DT_DIR) ||
2660 !strcmp(".", d->d_name) ||
2661 !strcmp("..", d->d_name))
2664 scnprintf(path, sizeof(path), "%s/%s/comm",
2665 procfs__mountpoint(), d->d_name);
2667 if (filename__read_str(path, &data, &size))
2670 ret = strncmp(name, data, len);
2675 return ret ? false : true;
2678 int perf_evsel__open_strerror(struct perf_evsel *evsel, struct target *target,
2679 int err, char *msg, size_t size)
2681 char sbuf[STRERR_BUFSIZE];
2688 printed = scnprintf(msg, size,
2689 "No permission to enable %s event.\n\n",
2690 perf_evsel__name(evsel));
2692 return scnprintf(msg + printed, size - printed,
2693 "You may not have permission to collect %sstats.\n\n"
2694 "Consider tweaking /proc/sys/kernel/perf_event_paranoid,\n"
2695 "which controls use of the performance events system by\n"
2696 "unprivileged users (without CAP_SYS_ADMIN).\n\n"
2697 "The current value is %d:\n\n"
2698 " -1: Allow use of (almost) all events by all users\n"
2699 " Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK\n"
2700 ">= 0: Disallow ftrace function tracepoint by users without CAP_SYS_ADMIN\n"
2701 " Disallow raw tracepoint access by users without CAP_SYS_ADMIN\n"
2702 ">= 1: Disallow CPU event access by users without CAP_SYS_ADMIN\n"
2703 ">= 2: Disallow kernel profiling by users without CAP_SYS_ADMIN\n\n"
2704 "To make this setting permanent, edit /etc/sysctl.conf too, e.g.:\n\n"
2705 " kernel.perf_event_paranoid = -1\n" ,
2706 target->system_wide ? "system-wide " : "",
2707 perf_event_paranoid());
2709 return scnprintf(msg, size, "The %s event is not supported.",
2710 perf_evsel__name(evsel));
2712 return scnprintf(msg, size, "%s",
2713 "Too many events are opened.\n"
2714 "Probably the maximum number of open file descriptors has been reached.\n"
2715 "Hint: Try again after reducing the number of events.\n"
2716 "Hint: Try increasing the limit with 'ulimit -n <limit>'");
2718 if ((evsel->attr.sample_type & PERF_SAMPLE_CALLCHAIN) != 0 &&
2719 access("/proc/sys/kernel/perf_event_max_stack", F_OK) == 0)
2720 return scnprintf(msg, size,
2721 "Not enough memory to setup event with callchain.\n"
2722 "Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack\n"
2723 "Hint: Current value: %d", sysctl_perf_event_max_stack);
2726 if (target->cpu_list)
2727 return scnprintf(msg, size, "%s",
2728 "No such device - did you specify an out-of-range profile CPU?");
2731 if (evsel->attr.sample_period != 0)
2732 return scnprintf(msg, size, "%s",
2733 "PMU Hardware doesn't support sampling/overflow-interrupts.");
2734 if (evsel->attr.precise_ip)
2735 return scnprintf(msg, size, "%s",
2736 "\'precise\' request may not be supported. Try removing 'p' modifier.");
2737 #if defined(__i386__) || defined(__x86_64__)
2738 if (evsel->attr.type == PERF_TYPE_HARDWARE)
2739 return scnprintf(msg, size, "%s",
2740 "No hardware sampling interrupt available.\n"
2741 "No APIC? If so then you can boot the kernel with the \"lapic\" boot parameter to force-enable it.");
2745 if (find_process("oprofiled"))
2746 return scnprintf(msg, size,
2747 "The PMU counters are busy/taken by another profiler.\n"
2748 "We found oprofile daemon running, please stop it and try again.");
2751 if (evsel->attr.write_backward && perf_missing_features.write_backward)
2752 return scnprintf(msg, size, "Reading from overwrite event is not supported by this kernel.");
2753 if (perf_missing_features.clockid)
2754 return scnprintf(msg, size, "clockid feature not supported.");
2755 if (perf_missing_features.clockid_wrong)
2756 return scnprintf(msg, size, "wrong clockid (%d).", clockid);
2762 return scnprintf(msg, size,
2763 "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n"
2764 "/bin/dmesg may provide additional information.\n"
2765 "No CONFIG_PERF_EVENTS=y kernel support configured?",
2766 err, str_error_r(err, sbuf, sizeof(sbuf)),
2767 perf_evsel__name(evsel));
2770 char *perf_evsel__env_arch(struct perf_evsel *evsel)
2772 if (evsel && evsel->evlist && evsel->evlist->env)
2773 return evsel->evlist->env->arch;
2777 char *perf_evsel__env_cpuid(struct perf_evsel *evsel)
2779 if (evsel && evsel->evlist && evsel->evlist->env)
2780 return evsel->evlist->env->cpuid;