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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /tools/perf/util/record.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/perf/util/record.c')
-rw-r--r-- | tools/perf/util/record.c | 291 |
1 files changed, 291 insertions, 0 deletions
diff --git a/tools/perf/util/record.c b/tools/perf/util/record.c new file mode 100644 index 0000000000..9eb5c6a089 --- /dev/null +++ b/tools/perf/util/record.c @@ -0,0 +1,291 @@ +// SPDX-License-Identifier: GPL-2.0 +#include "debug.h" +#include "evlist.h" +#include "evsel.h" +#include "evsel_config.h" +#include "parse-events.h" +#include <errno.h> +#include <limits.h> +#include <stdlib.h> +#include <api/fs/fs.h> +#include <subcmd/parse-options.h> +#include <perf/cpumap.h> +#include "cloexec.h" +#include "util/perf_api_probe.h" +#include "record.h" +#include "../perf-sys.h" +#include "topdown.h" +#include "map_symbol.h" +#include "mem-events.h" + +/* + * evsel__config_leader_sampling() uses special rules for leader sampling. + * However, if the leader is an AUX area event, then assume the event to sample + * is the next event. + */ +static struct evsel *evsel__read_sampler(struct evsel *evsel, struct evlist *evlist) +{ + struct evsel *leader = evsel__leader(evsel); + + if (evsel__is_aux_event(leader) || arch_topdown_sample_read(leader) || + is_mem_loads_aux_event(leader)) { + evlist__for_each_entry(evlist, evsel) { + if (evsel__leader(evsel) == leader && evsel != evsel__leader(evsel)) + return evsel; + } + } + + return leader; +} + +static u64 evsel__config_term_mask(struct evsel *evsel) +{ + struct evsel_config_term *term; + struct list_head *config_terms = &evsel->config_terms; + u64 term_types = 0; + + list_for_each_entry(term, config_terms, list) { + term_types |= 1 << term->type; + } + return term_types; +} + +static void evsel__config_leader_sampling(struct evsel *evsel, struct evlist *evlist) +{ + struct perf_event_attr *attr = &evsel->core.attr; + struct evsel *leader = evsel__leader(evsel); + struct evsel *read_sampler; + u64 term_types, freq_mask; + + if (!leader->sample_read) + return; + + read_sampler = evsel__read_sampler(evsel, evlist); + + if (evsel == read_sampler) + return; + + term_types = evsel__config_term_mask(evsel); + /* + * Disable sampling for all group members except those with explicit + * config terms or the leader. In the case of an AUX area event, the 2nd + * event in the group is the one that 'leads' the sampling. + */ + freq_mask = (1 << EVSEL__CONFIG_TERM_FREQ) | (1 << EVSEL__CONFIG_TERM_PERIOD); + if ((term_types & freq_mask) == 0) { + attr->freq = 0; + attr->sample_freq = 0; + attr->sample_period = 0; + } + if ((term_types & (1 << EVSEL__CONFIG_TERM_OVERWRITE)) == 0) + attr->write_backward = 0; + + /* + * We don't get a sample for slave events, we make them when delivering + * the group leader sample. Set the slave event to follow the master + * sample_type to ease up reporting. + * An AUX area event also has sample_type requirements, so also include + * the sample type bits from the leader's sample_type to cover that + * case. + */ + attr->sample_type = read_sampler->core.attr.sample_type | + leader->core.attr.sample_type; +} + +void evlist__config(struct evlist *evlist, struct record_opts *opts, struct callchain_param *callchain) +{ + struct evsel *evsel; + bool use_sample_identifier = false; + bool use_comm_exec; + bool sample_id = opts->sample_id; + + if (perf_cpu_map__cpu(evlist->core.user_requested_cpus, 0).cpu < 0) + opts->no_inherit = true; + + use_comm_exec = perf_can_comm_exec(); + + evlist__for_each_entry(evlist, evsel) { + evsel__config(evsel, opts, callchain); + if (evsel->tracking && use_comm_exec) + evsel->core.attr.comm_exec = 1; + } + + /* Configure leader sampling here now that the sample type is known */ + evlist__for_each_entry(evlist, evsel) + evsel__config_leader_sampling(evsel, evlist); + + if (opts->full_auxtrace || opts->sample_identifier) { + /* + * Need to be able to synthesize and parse selected events with + * arbitrary sample types, which requires always being able to + * match the id. + */ + use_sample_identifier = perf_can_sample_identifier(); + sample_id = true; + } else if (evlist->core.nr_entries > 1) { + struct evsel *first = evlist__first(evlist); + + evlist__for_each_entry(evlist, evsel) { + if (evsel->core.attr.sample_type == first->core.attr.sample_type) + continue; + use_sample_identifier = perf_can_sample_identifier(); + break; + } + sample_id = true; + } + + if (sample_id) { + evlist__for_each_entry(evlist, evsel) + evsel__set_sample_id(evsel, use_sample_identifier); + } + + evlist__set_id_pos(evlist); +} + +static int get_max_rate(unsigned int *rate) +{ + return sysctl__read_int("kernel/perf_event_max_sample_rate", (int *)rate); +} + +static int record_opts__config_freq(struct record_opts *opts) +{ + bool user_freq = opts->user_freq != UINT_MAX; + bool user_interval = opts->user_interval != ULLONG_MAX; + unsigned int max_rate; + + if (user_interval && user_freq) { + pr_err("cannot set frequency and period at the same time\n"); + return -1; + } + + if (user_interval) + opts->default_interval = opts->user_interval; + if (user_freq) + opts->freq = opts->user_freq; + + /* + * User specified count overrides default frequency. + */ + if (opts->default_interval) + opts->freq = 0; + else if (opts->freq) { + opts->default_interval = opts->freq; + } else { + pr_err("frequency and count are zero, aborting\n"); + return -1; + } + + if (get_max_rate(&max_rate)) + return 0; + + /* + * User specified frequency is over current maximum. + */ + if (user_freq && (max_rate < opts->freq)) { + if (opts->strict_freq) { + pr_err("error: Maximum frequency rate (%'u Hz) exceeded.\n" + " Please use -F freq option with a lower value or consider\n" + " tweaking /proc/sys/kernel/perf_event_max_sample_rate.\n", + max_rate); + return -1; + } else { + pr_warning("warning: Maximum frequency rate (%'u Hz) exceeded, throttling from %'u Hz to %'u Hz.\n" + " The limit can be raised via /proc/sys/kernel/perf_event_max_sample_rate.\n" + " The kernel will lower it when perf's interrupts take too long.\n" + " Use --strict-freq to disable this throttling, refusing to record.\n", + max_rate, opts->freq, max_rate); + + opts->freq = max_rate; + } + } + + /* + * Default frequency is over current maximum. + */ + if (max_rate < opts->freq) { + pr_warning("Lowering default frequency rate from %u to %u.\n" + "Please consider tweaking " + "/proc/sys/kernel/perf_event_max_sample_rate.\n", + opts->freq, max_rate); + opts->freq = max_rate; + } + + return 0; +} + +int record_opts__config(struct record_opts *opts) +{ + return record_opts__config_freq(opts); +} + +bool evlist__can_select_event(struct evlist *evlist, const char *str) +{ + struct evlist *temp_evlist; + struct evsel *evsel; + int err, fd; + struct perf_cpu cpu = { .cpu = 0 }; + bool ret = false; + pid_t pid = -1; + + temp_evlist = evlist__new(); + if (!temp_evlist) + return false; + + err = parse_event(temp_evlist, str); + if (err) + goto out_delete; + + evsel = evlist__last(temp_evlist); + + if (!evlist || perf_cpu_map__empty(evlist->core.user_requested_cpus)) { + struct perf_cpu_map *cpus = perf_cpu_map__new(NULL); + + if (cpus) + cpu = perf_cpu_map__cpu(cpus, 0); + + perf_cpu_map__put(cpus); + } else { + cpu = perf_cpu_map__cpu(evlist->core.user_requested_cpus, 0); + } + + while (1) { + fd = sys_perf_event_open(&evsel->core.attr, pid, cpu.cpu, -1, + perf_event_open_cloexec_flag()); + if (fd < 0) { + if (pid == -1 && errno == EACCES) { + pid = 0; + continue; + } + goto out_delete; + } + break; + } + close(fd); + ret = true; + +out_delete: + evlist__delete(temp_evlist); + return ret; +} + +int record__parse_freq(const struct option *opt, const char *str, int unset __maybe_unused) +{ + unsigned int freq; + struct record_opts *opts = opt->value; + + if (!str) + return -EINVAL; + + if (strcasecmp(str, "max") == 0) { + if (get_max_rate(&freq)) { + pr_err("couldn't read /proc/sys/kernel/perf_event_max_sample_rate\n"); + return -1; + } + pr_info("info: Using a maximum frequency rate of %'d Hz\n", freq); + } else { + freq = atoi(str); + } + + opts->user_freq = freq; + return 0; +} |