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9e0cc4fe37
Add support for reading from the AUX area tracing mmap and synthesizing AUX area tracing events. This patch introduces an abstraction for recording AUX area data. Recording is initialized by auxtrace_record__init() which is a weak function to be implemented by the architecture to provide recording callbacks. Recording is mainly handled by auxtrace_mmap__read() and perf_event__synthesize_auxtrace() but there are callbacks for miscellaneous needs including validating and processing user options, populating private data in auxtrace_info_event, and freeing the structure when finished. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Acked-by: Jiri Olsa <jolsa@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1428594864-29309-5-git-send-email-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
253 lines
5.4 KiB
C
253 lines
5.4 KiB
C
#include "evlist.h"
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#include "evsel.h"
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#include "cpumap.h"
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#include "parse-events.h"
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#include <api/fs/fs.h>
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#include "util.h"
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#include "cloexec.h"
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typedef void (*setup_probe_fn_t)(struct perf_evsel *evsel);
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static int perf_do_probe_api(setup_probe_fn_t fn, int cpu, const char *str)
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{
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struct perf_evlist *evlist;
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struct perf_evsel *evsel;
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unsigned long flags = perf_event_open_cloexec_flag();
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int err = -EAGAIN, fd;
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static pid_t pid = -1;
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evlist = perf_evlist__new();
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if (!evlist)
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return -ENOMEM;
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if (parse_events(evlist, str))
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goto out_delete;
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evsel = perf_evlist__first(evlist);
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while (1) {
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fd = sys_perf_event_open(&evsel->attr, pid, cpu, -1, flags);
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if (fd < 0) {
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if (pid == -1 && errno == EACCES) {
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pid = 0;
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continue;
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}
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goto out_delete;
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}
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break;
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}
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close(fd);
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fn(evsel);
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fd = sys_perf_event_open(&evsel->attr, pid, cpu, -1, flags);
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if (fd < 0) {
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if (errno == EINVAL)
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err = -EINVAL;
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goto out_delete;
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}
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close(fd);
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err = 0;
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out_delete:
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perf_evlist__delete(evlist);
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return err;
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}
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static bool perf_probe_api(setup_probe_fn_t fn)
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{
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const char *try[] = {"cycles:u", "instructions:u", "cpu-clock:u", NULL};
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struct cpu_map *cpus;
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int cpu, ret, i = 0;
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cpus = cpu_map__new(NULL);
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if (!cpus)
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return false;
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cpu = cpus->map[0];
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cpu_map__delete(cpus);
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do {
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ret = perf_do_probe_api(fn, cpu, try[i++]);
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if (!ret)
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return true;
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} while (ret == -EAGAIN && try[i]);
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return false;
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}
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static void perf_probe_sample_identifier(struct perf_evsel *evsel)
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{
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evsel->attr.sample_type |= PERF_SAMPLE_IDENTIFIER;
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}
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static void perf_probe_comm_exec(struct perf_evsel *evsel)
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{
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evsel->attr.comm_exec = 1;
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}
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bool perf_can_sample_identifier(void)
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{
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return perf_probe_api(perf_probe_sample_identifier);
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}
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static bool perf_can_comm_exec(void)
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{
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return perf_probe_api(perf_probe_comm_exec);
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}
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void perf_evlist__config(struct perf_evlist *evlist, struct record_opts *opts)
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{
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struct perf_evsel *evsel;
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bool use_sample_identifier = false;
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bool use_comm_exec;
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/*
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* Set the evsel leader links before we configure attributes,
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* since some might depend on this info.
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*/
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if (opts->group)
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perf_evlist__set_leader(evlist);
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if (evlist->cpus->map[0] < 0)
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opts->no_inherit = true;
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use_comm_exec = perf_can_comm_exec();
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evlist__for_each(evlist, evsel) {
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perf_evsel__config(evsel, opts);
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if (evsel->tracking && use_comm_exec)
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evsel->attr.comm_exec = 1;
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}
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if (opts->full_auxtrace) {
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/*
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* Need to be able to synthesize and parse selected events with
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* arbitrary sample types, which requires always being able to
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* match the id.
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*/
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use_sample_identifier = perf_can_sample_identifier();
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evlist__for_each(evlist, evsel)
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perf_evsel__set_sample_id(evsel, use_sample_identifier);
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} else if (evlist->nr_entries > 1) {
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struct perf_evsel *first = perf_evlist__first(evlist);
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evlist__for_each(evlist, evsel) {
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if (evsel->attr.sample_type == first->attr.sample_type)
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continue;
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use_sample_identifier = perf_can_sample_identifier();
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break;
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}
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evlist__for_each(evlist, evsel)
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perf_evsel__set_sample_id(evsel, use_sample_identifier);
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}
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perf_evlist__set_id_pos(evlist);
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}
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static int get_max_rate(unsigned int *rate)
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{
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return sysctl__read_int("kernel/perf_event_max_sample_rate", (int *)rate);
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}
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static int record_opts__config_freq(struct record_opts *opts)
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{
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bool user_freq = opts->user_freq != UINT_MAX;
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unsigned int max_rate;
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if (opts->user_interval != ULLONG_MAX)
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opts->default_interval = opts->user_interval;
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if (user_freq)
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opts->freq = opts->user_freq;
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/*
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* User specified count overrides default frequency.
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*/
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if (opts->default_interval)
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opts->freq = 0;
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else if (opts->freq) {
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opts->default_interval = opts->freq;
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} else {
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pr_err("frequency and count are zero, aborting\n");
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return -1;
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}
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if (get_max_rate(&max_rate))
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return 0;
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/*
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* User specified frequency is over current maximum.
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*/
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if (user_freq && (max_rate < opts->freq)) {
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pr_err("Maximum frequency rate (%u) reached.\n"
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"Please use -F freq option with lower value or consider\n"
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"tweaking /proc/sys/kernel/perf_event_max_sample_rate.\n",
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max_rate);
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return -1;
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}
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/*
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* Default frequency is over current maximum.
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*/
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if (max_rate < opts->freq) {
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pr_warning("Lowering default frequency rate to %u.\n"
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"Please consider tweaking "
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"/proc/sys/kernel/perf_event_max_sample_rate.\n",
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max_rate);
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opts->freq = max_rate;
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}
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return 0;
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}
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int record_opts__config(struct record_opts *opts)
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{
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return record_opts__config_freq(opts);
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}
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bool perf_evlist__can_select_event(struct perf_evlist *evlist, const char *str)
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{
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struct perf_evlist *temp_evlist;
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struct perf_evsel *evsel;
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int err, fd, cpu;
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bool ret = false;
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pid_t pid = -1;
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temp_evlist = perf_evlist__new();
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if (!temp_evlist)
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return false;
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err = parse_events(temp_evlist, str);
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if (err)
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goto out_delete;
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evsel = perf_evlist__last(temp_evlist);
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if (!evlist || cpu_map__empty(evlist->cpus)) {
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struct cpu_map *cpus = cpu_map__new(NULL);
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cpu = cpus ? cpus->map[0] : 0;
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cpu_map__delete(cpus);
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} else {
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cpu = evlist->cpus->map[0];
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}
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while (1) {
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fd = sys_perf_event_open(&evsel->attr, pid, cpu, -1,
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perf_event_open_cloexec_flag());
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if (fd < 0) {
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if (pid == -1 && errno == EACCES) {
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pid = 0;
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continue;
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}
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goto out_delete;
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}
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break;
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}
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close(fd);
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ret = true;
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out_delete:
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perf_evlist__delete(temp_evlist);
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return ret;
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}
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