![Jiri Olsa](/assets/img/avatar_default.png)
We need to synthesize events first, because some features works on top of them (on report side). Signed-off-by: Jiri Olsa <jolsa@kernel.org> Tested-by: Stephane Eranian <eranian@google.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20180314092205.23291-1-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
1903 lines
50 KiB
C
1903 lines
50 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* builtin-record.c
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*
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* Builtin record command: Record the profile of a workload
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* (or a CPU, or a PID) into the perf.data output file - for
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* later analysis via perf report.
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*/
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#include "builtin.h"
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#include "perf.h"
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#include "util/build-id.h"
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#include "util/util.h"
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#include <subcmd/parse-options.h>
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#include "util/parse-events.h"
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#include "util/config.h"
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#include "util/callchain.h"
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#include "util/cgroup.h"
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#include "util/header.h"
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#include "util/event.h"
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#include "util/evlist.h"
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#include "util/evsel.h"
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#include "util/debug.h"
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#include "util/drv_configs.h"
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#include "util/session.h"
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#include "util/tool.h"
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#include "util/symbol.h"
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#include "util/cpumap.h"
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#include "util/thread_map.h"
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#include "util/data.h"
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#include "util/perf_regs.h"
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#include "util/auxtrace.h"
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#include "util/tsc.h"
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#include "util/parse-branch-options.h"
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#include "util/parse-regs-options.h"
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#include "util/llvm-utils.h"
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#include "util/bpf-loader.h"
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#include "util/trigger.h"
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#include "util/perf-hooks.h"
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#include "util/time-utils.h"
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#include "util/units.h"
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#include "asm/bug.h"
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#include <errno.h>
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#include <inttypes.h>
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#include <locale.h>
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#include <poll.h>
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#include <unistd.h>
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#include <sched.h>
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#include <signal.h>
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#include <sys/mman.h>
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#include <sys/wait.h>
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#include <linux/time64.h>
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struct switch_output {
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bool enabled;
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bool signal;
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unsigned long size;
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unsigned long time;
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const char *str;
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bool set;
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};
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struct record {
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struct perf_tool tool;
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struct record_opts opts;
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u64 bytes_written;
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struct perf_data data;
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struct auxtrace_record *itr;
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struct perf_evlist *evlist;
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struct perf_session *session;
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int realtime_prio;
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bool no_buildid;
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bool no_buildid_set;
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bool no_buildid_cache;
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bool no_buildid_cache_set;
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bool buildid_all;
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bool timestamp_filename;
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bool timestamp_boundary;
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struct switch_output switch_output;
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unsigned long long samples;
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};
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static volatile int auxtrace_record__snapshot_started;
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static DEFINE_TRIGGER(auxtrace_snapshot_trigger);
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static DEFINE_TRIGGER(switch_output_trigger);
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static bool switch_output_signal(struct record *rec)
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{
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return rec->switch_output.signal &&
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trigger_is_ready(&switch_output_trigger);
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}
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static bool switch_output_size(struct record *rec)
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{
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return rec->switch_output.size &&
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trigger_is_ready(&switch_output_trigger) &&
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(rec->bytes_written >= rec->switch_output.size);
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}
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static bool switch_output_time(struct record *rec)
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{
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return rec->switch_output.time &&
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trigger_is_ready(&switch_output_trigger);
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}
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static int record__write(struct record *rec, void *bf, size_t size)
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{
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if (perf_data__write(rec->session->data, bf, size) < 0) {
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pr_err("failed to write perf data, error: %m\n");
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return -1;
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}
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rec->bytes_written += size;
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if (switch_output_size(rec))
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trigger_hit(&switch_output_trigger);
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return 0;
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}
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static int process_synthesized_event(struct perf_tool *tool,
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union perf_event *event,
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struct perf_sample *sample __maybe_unused,
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struct machine *machine __maybe_unused)
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{
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struct record *rec = container_of(tool, struct record, tool);
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return record__write(rec, event, event->header.size);
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}
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static int record__pushfn(void *to, void *bf, size_t size)
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{
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struct record *rec = to;
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rec->samples++;
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return record__write(rec, bf, size);
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}
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static volatile int done;
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static volatile int signr = -1;
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static volatile int child_finished;
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static void sig_handler(int sig)
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{
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if (sig == SIGCHLD)
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child_finished = 1;
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else
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signr = sig;
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done = 1;
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}
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static void sigsegv_handler(int sig)
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{
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perf_hooks__recover();
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sighandler_dump_stack(sig);
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}
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static void record__sig_exit(void)
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{
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if (signr == -1)
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return;
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signal(signr, SIG_DFL);
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raise(signr);
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}
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#ifdef HAVE_AUXTRACE_SUPPORT
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static int record__process_auxtrace(struct perf_tool *tool,
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union perf_event *event, void *data1,
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size_t len1, void *data2, size_t len2)
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{
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struct record *rec = container_of(tool, struct record, tool);
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struct perf_data *data = &rec->data;
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size_t padding;
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u8 pad[8] = {0};
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if (!perf_data__is_pipe(data)) {
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off_t file_offset;
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int fd = perf_data__fd(data);
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int err;
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file_offset = lseek(fd, 0, SEEK_CUR);
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if (file_offset == -1)
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return -1;
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err = auxtrace_index__auxtrace_event(&rec->session->auxtrace_index,
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event, file_offset);
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if (err)
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return err;
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}
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/* event.auxtrace.size includes padding, see __auxtrace_mmap__read() */
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padding = (len1 + len2) & 7;
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if (padding)
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padding = 8 - padding;
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record__write(rec, event, event->header.size);
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record__write(rec, data1, len1);
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if (len2)
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record__write(rec, data2, len2);
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record__write(rec, &pad, padding);
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return 0;
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}
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static int record__auxtrace_mmap_read(struct record *rec,
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struct auxtrace_mmap *mm)
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{
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int ret;
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ret = auxtrace_mmap__read(mm, rec->itr, &rec->tool,
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record__process_auxtrace);
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if (ret < 0)
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return ret;
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if (ret)
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rec->samples++;
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return 0;
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}
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static int record__auxtrace_mmap_read_snapshot(struct record *rec,
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struct auxtrace_mmap *mm)
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{
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int ret;
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ret = auxtrace_mmap__read_snapshot(mm, rec->itr, &rec->tool,
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record__process_auxtrace,
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rec->opts.auxtrace_snapshot_size);
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if (ret < 0)
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return ret;
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if (ret)
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rec->samples++;
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return 0;
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}
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static int record__auxtrace_read_snapshot_all(struct record *rec)
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{
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int i;
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int rc = 0;
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for (i = 0; i < rec->evlist->nr_mmaps; i++) {
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struct auxtrace_mmap *mm =
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&rec->evlist->mmap[i].auxtrace_mmap;
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if (!mm->base)
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continue;
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if (record__auxtrace_mmap_read_snapshot(rec, mm) != 0) {
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rc = -1;
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goto out;
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}
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}
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out:
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return rc;
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}
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static void record__read_auxtrace_snapshot(struct record *rec)
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{
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pr_debug("Recording AUX area tracing snapshot\n");
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if (record__auxtrace_read_snapshot_all(rec) < 0) {
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trigger_error(&auxtrace_snapshot_trigger);
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} else {
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if (auxtrace_record__snapshot_finish(rec->itr))
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trigger_error(&auxtrace_snapshot_trigger);
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else
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trigger_ready(&auxtrace_snapshot_trigger);
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}
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}
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static int record__auxtrace_init(struct record *rec)
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{
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int err;
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if (!rec->itr) {
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rec->itr = auxtrace_record__init(rec->evlist, &err);
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if (err)
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return err;
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}
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err = auxtrace_parse_snapshot_options(rec->itr, &rec->opts,
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rec->opts.auxtrace_snapshot_opts);
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if (err)
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return err;
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return auxtrace_parse_filters(rec->evlist);
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}
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#else
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static inline
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int record__auxtrace_mmap_read(struct record *rec __maybe_unused,
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struct auxtrace_mmap *mm __maybe_unused)
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{
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return 0;
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}
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static inline
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void record__read_auxtrace_snapshot(struct record *rec __maybe_unused)
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{
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}
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static inline
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int auxtrace_record__snapshot_start(struct auxtrace_record *itr __maybe_unused)
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{
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return 0;
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}
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static int record__auxtrace_init(struct record *rec __maybe_unused)
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{
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return 0;
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}
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#endif
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static int record__mmap_evlist(struct record *rec,
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struct perf_evlist *evlist)
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{
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struct record_opts *opts = &rec->opts;
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char msg[512];
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if (perf_evlist__mmap_ex(evlist, opts->mmap_pages,
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opts->auxtrace_mmap_pages,
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opts->auxtrace_snapshot_mode) < 0) {
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if (errno == EPERM) {
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pr_err("Permission error mapping pages.\n"
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"Consider increasing "
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"/proc/sys/kernel/perf_event_mlock_kb,\n"
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"or try again with a smaller value of -m/--mmap_pages.\n"
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"(current value: %u,%u)\n",
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opts->mmap_pages, opts->auxtrace_mmap_pages);
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return -errno;
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} else {
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pr_err("failed to mmap with %d (%s)\n", errno,
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str_error_r(errno, msg, sizeof(msg)));
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if (errno)
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return -errno;
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else
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return -EINVAL;
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}
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}
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return 0;
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}
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static int record__mmap(struct record *rec)
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{
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return record__mmap_evlist(rec, rec->evlist);
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}
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static int record__open(struct record *rec)
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{
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char msg[BUFSIZ];
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struct perf_evsel *pos;
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struct perf_evlist *evlist = rec->evlist;
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struct perf_session *session = rec->session;
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struct record_opts *opts = &rec->opts;
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struct perf_evsel_config_term *err_term;
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int rc = 0;
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/*
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* For initial_delay we need to add a dummy event so that we can track
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* PERF_RECORD_MMAP while we wait for the initial delay to enable the
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* real events, the ones asked by the user.
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*/
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if (opts->initial_delay) {
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if (perf_evlist__add_dummy(evlist))
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return -ENOMEM;
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pos = perf_evlist__first(evlist);
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pos->tracking = 0;
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pos = perf_evlist__last(evlist);
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pos->tracking = 1;
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pos->attr.enable_on_exec = 1;
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}
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perf_evlist__config(evlist, opts, &callchain_param);
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evlist__for_each_entry(evlist, pos) {
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try_again:
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if (perf_evsel__open(pos, pos->cpus, pos->threads) < 0) {
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if (perf_evsel__fallback(pos, errno, msg, sizeof(msg))) {
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if (verbose > 0)
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ui__warning("%s\n", msg);
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goto try_again;
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}
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rc = -errno;
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perf_evsel__open_strerror(pos, &opts->target,
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errno, msg, sizeof(msg));
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ui__error("%s\n", msg);
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goto out;
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}
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pos->supported = true;
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}
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if (perf_evlist__apply_filters(evlist, &pos)) {
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pr_err("failed to set filter \"%s\" on event %s with %d (%s)\n",
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pos->filter, perf_evsel__name(pos), errno,
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str_error_r(errno, msg, sizeof(msg)));
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rc = -1;
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goto out;
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}
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if (perf_evlist__apply_drv_configs(evlist, &pos, &err_term)) {
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pr_err("failed to set config \"%s\" on event %s with %d (%s)\n",
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err_term->val.drv_cfg, perf_evsel__name(pos), errno,
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str_error_r(errno, msg, sizeof(msg)));
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rc = -1;
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goto out;
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}
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rc = record__mmap(rec);
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if (rc)
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goto out;
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session->evlist = evlist;
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perf_session__set_id_hdr_size(session);
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out:
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return rc;
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}
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static int process_sample_event(struct perf_tool *tool,
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union perf_event *event,
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struct perf_sample *sample,
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struct perf_evsel *evsel,
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struct machine *machine)
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{
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struct record *rec = container_of(tool, struct record, tool);
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if (rec->evlist->first_sample_time == 0)
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rec->evlist->first_sample_time = sample->time;
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rec->evlist->last_sample_time = sample->time;
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if (rec->buildid_all)
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return 0;
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rec->samples++;
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return build_id__mark_dso_hit(tool, event, sample, evsel, machine);
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}
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static int process_buildids(struct record *rec)
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{
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struct perf_data *data = &rec->data;
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struct perf_session *session = rec->session;
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if (data->size == 0)
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return 0;
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/*
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* During this process, it'll load kernel map and replace the
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* dso->long_name to a real pathname it found. In this case
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* we prefer the vmlinux path like
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* /lib/modules/3.16.4/build/vmlinux
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*
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* rather than build-id path (in debug directory).
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* $HOME/.debug/.build-id/f0/6e17aa50adf4d00b88925e03775de107611551
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*/
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symbol_conf.ignore_vmlinux_buildid = true;
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/*
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* If --buildid-all is given, it marks all DSO regardless of hits,
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* so no need to process samples. But if timestamp_boundary is enabled,
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* it still needs to walk on all samples to get the timestamps of
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* first/last samples.
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*/
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if (rec->buildid_all && !rec->timestamp_boundary)
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rec->tool.sample = NULL;
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return perf_session__process_events(session);
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}
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|
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static void perf_event__synthesize_guest_os(struct machine *machine, void *data)
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{
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int err;
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struct perf_tool *tool = data;
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/*
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*As for guest kernel when processing subcommand record&report,
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*we arrange module mmap prior to guest kernel mmap and trigger
|
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*a preload dso because default guest module symbols are loaded
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*from guest kallsyms instead of /lib/modules/XXX/XXX. This
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*method is used to avoid symbol missing when the first addr is
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*in module instead of in guest kernel.
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*/
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err = perf_event__synthesize_modules(tool, process_synthesized_event,
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machine);
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if (err < 0)
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pr_err("Couldn't record guest kernel [%d]'s reference"
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" relocation symbol.\n", machine->pid);
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|
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/*
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* We use _stext for guest kernel because guest kernel's /proc/kallsyms
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* have no _text sometimes.
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*/
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err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
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machine);
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if (err < 0)
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pr_err("Couldn't record guest kernel [%d]'s reference"
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" relocation symbol.\n", machine->pid);
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}
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static struct perf_event_header finished_round_event = {
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.size = sizeof(struct perf_event_header),
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.type = PERF_RECORD_FINISHED_ROUND,
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};
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|
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static int record__mmap_read_evlist(struct record *rec, struct perf_evlist *evlist,
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bool overwrite)
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{
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u64 bytes_written = rec->bytes_written;
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int i;
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int rc = 0;
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struct perf_mmap *maps;
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|
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if (!evlist)
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return 0;
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maps = overwrite ? evlist->overwrite_mmap : evlist->mmap;
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if (!maps)
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return 0;
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|
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if (overwrite && evlist->bkw_mmap_state != BKW_MMAP_DATA_PENDING)
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return 0;
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|
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for (i = 0; i < evlist->nr_mmaps; i++) {
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struct auxtrace_mmap *mm = &maps[i].auxtrace_mmap;
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|
|
if (maps[i].base) {
|
|
if (perf_mmap__push(&maps[i], rec, record__pushfn) != 0) {
|
|
rc = -1;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (mm->base && !rec->opts.auxtrace_snapshot_mode &&
|
|
record__auxtrace_mmap_read(rec, mm) != 0) {
|
|
rc = -1;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Mark the round finished in case we wrote
|
|
* at least one event.
|
|
*/
|
|
if (bytes_written != rec->bytes_written)
|
|
rc = record__write(rec, &finished_round_event, sizeof(finished_round_event));
|
|
|
|
if (overwrite)
|
|
perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_EMPTY);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
static int record__mmap_read_all(struct record *rec)
|
|
{
|
|
int err;
|
|
|
|
err = record__mmap_read_evlist(rec, rec->evlist, false);
|
|
if (err)
|
|
return err;
|
|
|
|
return record__mmap_read_evlist(rec, rec->evlist, true);
|
|
}
|
|
|
|
static void record__init_features(struct record *rec)
|
|
{
|
|
struct perf_session *session = rec->session;
|
|
int feat;
|
|
|
|
for (feat = HEADER_FIRST_FEATURE; feat < HEADER_LAST_FEATURE; feat++)
|
|
perf_header__set_feat(&session->header, feat);
|
|
|
|
if (rec->no_buildid)
|
|
perf_header__clear_feat(&session->header, HEADER_BUILD_ID);
|
|
|
|
if (!have_tracepoints(&rec->evlist->entries))
|
|
perf_header__clear_feat(&session->header, HEADER_TRACING_DATA);
|
|
|
|
if (!rec->opts.branch_stack)
|
|
perf_header__clear_feat(&session->header, HEADER_BRANCH_STACK);
|
|
|
|
if (!rec->opts.full_auxtrace)
|
|
perf_header__clear_feat(&session->header, HEADER_AUXTRACE);
|
|
|
|
perf_header__clear_feat(&session->header, HEADER_STAT);
|
|
}
|
|
|
|
static void
|
|
record__finish_output(struct record *rec)
|
|
{
|
|
struct perf_data *data = &rec->data;
|
|
int fd = perf_data__fd(data);
|
|
|
|
if (data->is_pipe)
|
|
return;
|
|
|
|
rec->session->header.data_size += rec->bytes_written;
|
|
data->size = lseek(perf_data__fd(data), 0, SEEK_CUR);
|
|
|
|
if (!rec->no_buildid) {
|
|
process_buildids(rec);
|
|
|
|
if (rec->buildid_all)
|
|
dsos__hit_all(rec->session);
|
|
}
|
|
perf_session__write_header(rec->session, rec->evlist, fd, true);
|
|
|
|
return;
|
|
}
|
|
|
|
static int record__synthesize_workload(struct record *rec, bool tail)
|
|
{
|
|
int err;
|
|
struct thread_map *thread_map;
|
|
|
|
if (rec->opts.tail_synthesize != tail)
|
|
return 0;
|
|
|
|
thread_map = thread_map__new_by_tid(rec->evlist->workload.pid);
|
|
if (thread_map == NULL)
|
|
return -1;
|
|
|
|
err = perf_event__synthesize_thread_map(&rec->tool, thread_map,
|
|
process_synthesized_event,
|
|
&rec->session->machines.host,
|
|
rec->opts.sample_address,
|
|
rec->opts.proc_map_timeout);
|
|
thread_map__put(thread_map);
|
|
return err;
|
|
}
|
|
|
|
static int record__synthesize(struct record *rec, bool tail);
|
|
|
|
static int
|
|
record__switch_output(struct record *rec, bool at_exit)
|
|
{
|
|
struct perf_data *data = &rec->data;
|
|
int fd, err;
|
|
|
|
/* Same Size: "2015122520103046"*/
|
|
char timestamp[] = "InvalidTimestamp";
|
|
|
|
record__synthesize(rec, true);
|
|
if (target__none(&rec->opts.target))
|
|
record__synthesize_workload(rec, true);
|
|
|
|
rec->samples = 0;
|
|
record__finish_output(rec);
|
|
err = fetch_current_timestamp(timestamp, sizeof(timestamp));
|
|
if (err) {
|
|
pr_err("Failed to get current timestamp\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
fd = perf_data__switch(data, timestamp,
|
|
rec->session->header.data_offset,
|
|
at_exit);
|
|
if (fd >= 0 && !at_exit) {
|
|
rec->bytes_written = 0;
|
|
rec->session->header.data_size = 0;
|
|
}
|
|
|
|
if (!quiet)
|
|
fprintf(stderr, "[ perf record: Dump %s.%s ]\n",
|
|
data->file.path, timestamp);
|
|
|
|
/* Output tracking events */
|
|
if (!at_exit) {
|
|
record__synthesize(rec, false);
|
|
|
|
/*
|
|
* In 'perf record --switch-output' without -a,
|
|
* record__synthesize() in record__switch_output() won't
|
|
* generate tracking events because there's no thread_map
|
|
* in evlist. Which causes newly created perf.data doesn't
|
|
* contain map and comm information.
|
|
* Create a fake thread_map and directly call
|
|
* perf_event__synthesize_thread_map() for those events.
|
|
*/
|
|
if (target__none(&rec->opts.target))
|
|
record__synthesize_workload(rec, false);
|
|
}
|
|
return fd;
|
|
}
|
|
|
|
static volatile int workload_exec_errno;
|
|
|
|
/*
|
|
* perf_evlist__prepare_workload will send a SIGUSR1
|
|
* if the fork fails, since we asked by setting its
|
|
* want_signal to true.
|
|
*/
|
|
static void workload_exec_failed_signal(int signo __maybe_unused,
|
|
siginfo_t *info,
|
|
void *ucontext __maybe_unused)
|
|
{
|
|
workload_exec_errno = info->si_value.sival_int;
|
|
done = 1;
|
|
child_finished = 1;
|
|
}
|
|
|
|
static void snapshot_sig_handler(int sig);
|
|
static void alarm_sig_handler(int sig);
|
|
|
|
int __weak
|
|
perf_event__synth_time_conv(const struct perf_event_mmap_page *pc __maybe_unused,
|
|
struct perf_tool *tool __maybe_unused,
|
|
perf_event__handler_t process __maybe_unused,
|
|
struct machine *machine __maybe_unused)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static const struct perf_event_mmap_page *
|
|
perf_evlist__pick_pc(struct perf_evlist *evlist)
|
|
{
|
|
if (evlist) {
|
|
if (evlist->mmap && evlist->mmap[0].base)
|
|
return evlist->mmap[0].base;
|
|
if (evlist->overwrite_mmap && evlist->overwrite_mmap[0].base)
|
|
return evlist->overwrite_mmap[0].base;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static const struct perf_event_mmap_page *record__pick_pc(struct record *rec)
|
|
{
|
|
const struct perf_event_mmap_page *pc;
|
|
|
|
pc = perf_evlist__pick_pc(rec->evlist);
|
|
if (pc)
|
|
return pc;
|
|
return NULL;
|
|
}
|
|
|
|
static int record__synthesize(struct record *rec, bool tail)
|
|
{
|
|
struct perf_session *session = rec->session;
|
|
struct machine *machine = &session->machines.host;
|
|
struct perf_data *data = &rec->data;
|
|
struct record_opts *opts = &rec->opts;
|
|
struct perf_tool *tool = &rec->tool;
|
|
int fd = perf_data__fd(data);
|
|
int err = 0;
|
|
|
|
if (rec->opts.tail_synthesize != tail)
|
|
return 0;
|
|
|
|
if (data->is_pipe) {
|
|
/*
|
|
* We need to synthesize events first, because some
|
|
* features works on top of them (on report side).
|
|
*/
|
|
err = perf_event__synthesize_attrs(tool, session,
|
|
process_synthesized_event);
|
|
if (err < 0) {
|
|
pr_err("Couldn't synthesize attrs.\n");
|
|
goto out;
|
|
}
|
|
|
|
err = perf_event__synthesize_features(tool, session, rec->evlist,
|
|
process_synthesized_event);
|
|
if (err < 0) {
|
|
pr_err("Couldn't synthesize features.\n");
|
|
return err;
|
|
}
|
|
|
|
if (have_tracepoints(&rec->evlist->entries)) {
|
|
/*
|
|
* FIXME err <= 0 here actually means that
|
|
* there were no tracepoints so its not really
|
|
* an error, just that we don't need to
|
|
* synthesize anything. We really have to
|
|
* return this more properly and also
|
|
* propagate errors that now are calling die()
|
|
*/
|
|
err = perf_event__synthesize_tracing_data(tool, fd, rec->evlist,
|
|
process_synthesized_event);
|
|
if (err <= 0) {
|
|
pr_err("Couldn't record tracing data.\n");
|
|
goto out;
|
|
}
|
|
rec->bytes_written += err;
|
|
}
|
|
}
|
|
|
|
err = perf_event__synth_time_conv(record__pick_pc(rec), tool,
|
|
process_synthesized_event, machine);
|
|
if (err)
|
|
goto out;
|
|
|
|
if (rec->opts.full_auxtrace) {
|
|
err = perf_event__synthesize_auxtrace_info(rec->itr, tool,
|
|
session, process_synthesized_event);
|
|
if (err)
|
|
goto out;
|
|
}
|
|
|
|
if (!perf_evlist__exclude_kernel(rec->evlist)) {
|
|
err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
|
|
machine);
|
|
WARN_ONCE(err < 0, "Couldn't record kernel reference relocation symbol\n"
|
|
"Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
|
|
"Check /proc/kallsyms permission or run as root.\n");
|
|
|
|
err = perf_event__synthesize_modules(tool, process_synthesized_event,
|
|
machine);
|
|
WARN_ONCE(err < 0, "Couldn't record kernel module information.\n"
|
|
"Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
|
|
"Check /proc/modules permission or run as root.\n");
|
|
}
|
|
|
|
if (perf_guest) {
|
|
machines__process_guests(&session->machines,
|
|
perf_event__synthesize_guest_os, tool);
|
|
}
|
|
|
|
err = perf_event__synthesize_extra_attr(&rec->tool,
|
|
rec->evlist,
|
|
process_synthesized_event,
|
|
data->is_pipe);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = perf_event__synthesize_thread_map2(&rec->tool, rec->evlist->threads,
|
|
process_synthesized_event,
|
|
NULL);
|
|
if (err < 0) {
|
|
pr_err("Couldn't synthesize thread map.\n");
|
|
return err;
|
|
}
|
|
|
|
err = perf_event__synthesize_cpu_map(&rec->tool, rec->evlist->cpus,
|
|
process_synthesized_event, NULL);
|
|
if (err < 0) {
|
|
pr_err("Couldn't synthesize cpu map.\n");
|
|
return err;
|
|
}
|
|
|
|
err = __machine__synthesize_threads(machine, tool, &opts->target, rec->evlist->threads,
|
|
process_synthesized_event, opts->sample_address,
|
|
opts->proc_map_timeout, 1);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int __cmd_record(struct record *rec, int argc, const char **argv)
|
|
{
|
|
int err;
|
|
int status = 0;
|
|
unsigned long waking = 0;
|
|
const bool forks = argc > 0;
|
|
struct perf_tool *tool = &rec->tool;
|
|
struct record_opts *opts = &rec->opts;
|
|
struct perf_data *data = &rec->data;
|
|
struct perf_session *session;
|
|
bool disabled = false, draining = false;
|
|
int fd;
|
|
|
|
atexit(record__sig_exit);
|
|
signal(SIGCHLD, sig_handler);
|
|
signal(SIGINT, sig_handler);
|
|
signal(SIGTERM, sig_handler);
|
|
signal(SIGSEGV, sigsegv_handler);
|
|
|
|
if (rec->opts.record_namespaces)
|
|
tool->namespace_events = true;
|
|
|
|
if (rec->opts.auxtrace_snapshot_mode || rec->switch_output.enabled) {
|
|
signal(SIGUSR2, snapshot_sig_handler);
|
|
if (rec->opts.auxtrace_snapshot_mode)
|
|
trigger_on(&auxtrace_snapshot_trigger);
|
|
if (rec->switch_output.enabled)
|
|
trigger_on(&switch_output_trigger);
|
|
} else {
|
|
signal(SIGUSR2, SIG_IGN);
|
|
}
|
|
|
|
session = perf_session__new(data, false, tool);
|
|
if (session == NULL) {
|
|
pr_err("Perf session creation failed.\n");
|
|
return -1;
|
|
}
|
|
|
|
fd = perf_data__fd(data);
|
|
rec->session = session;
|
|
|
|
record__init_features(rec);
|
|
|
|
if (forks) {
|
|
err = perf_evlist__prepare_workload(rec->evlist, &opts->target,
|
|
argv, data->is_pipe,
|
|
workload_exec_failed_signal);
|
|
if (err < 0) {
|
|
pr_err("Couldn't run the workload!\n");
|
|
status = err;
|
|
goto out_delete_session;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If we have just single event and are sending data
|
|
* through pipe, we need to force the ids allocation,
|
|
* because we synthesize event name through the pipe
|
|
* and need the id for that.
|
|
*/
|
|
if (data->is_pipe && rec->evlist->nr_entries == 1)
|
|
rec->opts.sample_id = true;
|
|
|
|
if (record__open(rec) != 0) {
|
|
err = -1;
|
|
goto out_child;
|
|
}
|
|
|
|
err = bpf__apply_obj_config();
|
|
if (err) {
|
|
char errbuf[BUFSIZ];
|
|
|
|
bpf__strerror_apply_obj_config(err, errbuf, sizeof(errbuf));
|
|
pr_err("ERROR: Apply config to BPF failed: %s\n",
|
|
errbuf);
|
|
goto out_child;
|
|
}
|
|
|
|
/*
|
|
* Normally perf_session__new would do this, but it doesn't have the
|
|
* evlist.
|
|
*/
|
|
if (rec->tool.ordered_events && !perf_evlist__sample_id_all(rec->evlist)) {
|
|
pr_warning("WARNING: No sample_id_all support, falling back to unordered processing\n");
|
|
rec->tool.ordered_events = false;
|
|
}
|
|
|
|
if (!rec->evlist->nr_groups)
|
|
perf_header__clear_feat(&session->header, HEADER_GROUP_DESC);
|
|
|
|
if (data->is_pipe) {
|
|
err = perf_header__write_pipe(fd);
|
|
if (err < 0)
|
|
goto out_child;
|
|
} else {
|
|
err = perf_session__write_header(session, rec->evlist, fd, false);
|
|
if (err < 0)
|
|
goto out_child;
|
|
}
|
|
|
|
if (!rec->no_buildid
|
|
&& !perf_header__has_feat(&session->header, HEADER_BUILD_ID)) {
|
|
pr_err("Couldn't generate buildids. "
|
|
"Use --no-buildid to profile anyway.\n");
|
|
err = -1;
|
|
goto out_child;
|
|
}
|
|
|
|
err = record__synthesize(rec, false);
|
|
if (err < 0)
|
|
goto out_child;
|
|
|
|
if (rec->realtime_prio) {
|
|
struct sched_param param;
|
|
|
|
param.sched_priority = rec->realtime_prio;
|
|
if (sched_setscheduler(0, SCHED_FIFO, ¶m)) {
|
|
pr_err("Could not set realtime priority.\n");
|
|
err = -1;
|
|
goto out_child;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* When perf is starting the traced process, all the events
|
|
* (apart from group members) have enable_on_exec=1 set,
|
|
* so don't spoil it by prematurely enabling them.
|
|
*/
|
|
if (!target__none(&opts->target) && !opts->initial_delay)
|
|
perf_evlist__enable(rec->evlist);
|
|
|
|
/*
|
|
* Let the child rip
|
|
*/
|
|
if (forks) {
|
|
struct machine *machine = &session->machines.host;
|
|
union perf_event *event;
|
|
pid_t tgid;
|
|
|
|
event = malloc(sizeof(event->comm) + machine->id_hdr_size);
|
|
if (event == NULL) {
|
|
err = -ENOMEM;
|
|
goto out_child;
|
|
}
|
|
|
|
/*
|
|
* Some H/W events are generated before COMM event
|
|
* which is emitted during exec(), so perf script
|
|
* cannot see a correct process name for those events.
|
|
* Synthesize COMM event to prevent it.
|
|
*/
|
|
tgid = perf_event__synthesize_comm(tool, event,
|
|
rec->evlist->workload.pid,
|
|
process_synthesized_event,
|
|
machine);
|
|
free(event);
|
|
|
|
if (tgid == -1)
|
|
goto out_child;
|
|
|
|
event = malloc(sizeof(event->namespaces) +
|
|
(NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
|
|
machine->id_hdr_size);
|
|
if (event == NULL) {
|
|
err = -ENOMEM;
|
|
goto out_child;
|
|
}
|
|
|
|
/*
|
|
* Synthesize NAMESPACES event for the command specified.
|
|
*/
|
|
perf_event__synthesize_namespaces(tool, event,
|
|
rec->evlist->workload.pid,
|
|
tgid, process_synthesized_event,
|
|
machine);
|
|
free(event);
|
|
|
|
perf_evlist__start_workload(rec->evlist);
|
|
}
|
|
|
|
if (opts->initial_delay) {
|
|
usleep(opts->initial_delay * USEC_PER_MSEC);
|
|
perf_evlist__enable(rec->evlist);
|
|
}
|
|
|
|
trigger_ready(&auxtrace_snapshot_trigger);
|
|
trigger_ready(&switch_output_trigger);
|
|
perf_hooks__invoke_record_start();
|
|
for (;;) {
|
|
unsigned long long hits = rec->samples;
|
|
|
|
/*
|
|
* rec->evlist->bkw_mmap_state is possible to be
|
|
* BKW_MMAP_EMPTY here: when done == true and
|
|
* hits != rec->samples in previous round.
|
|
*
|
|
* perf_evlist__toggle_bkw_mmap ensure we never
|
|
* convert BKW_MMAP_EMPTY to BKW_MMAP_DATA_PENDING.
|
|
*/
|
|
if (trigger_is_hit(&switch_output_trigger) || done || draining)
|
|
perf_evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_DATA_PENDING);
|
|
|
|
if (record__mmap_read_all(rec) < 0) {
|
|
trigger_error(&auxtrace_snapshot_trigger);
|
|
trigger_error(&switch_output_trigger);
|
|
err = -1;
|
|
goto out_child;
|
|
}
|
|
|
|
if (auxtrace_record__snapshot_started) {
|
|
auxtrace_record__snapshot_started = 0;
|
|
if (!trigger_is_error(&auxtrace_snapshot_trigger))
|
|
record__read_auxtrace_snapshot(rec);
|
|
if (trigger_is_error(&auxtrace_snapshot_trigger)) {
|
|
pr_err("AUX area tracing snapshot failed\n");
|
|
err = -1;
|
|
goto out_child;
|
|
}
|
|
}
|
|
|
|
if (trigger_is_hit(&switch_output_trigger)) {
|
|
/*
|
|
* If switch_output_trigger is hit, the data in
|
|
* overwritable ring buffer should have been collected,
|
|
* so bkw_mmap_state should be set to BKW_MMAP_EMPTY.
|
|
*
|
|
* If SIGUSR2 raise after or during record__mmap_read_all(),
|
|
* record__mmap_read_all() didn't collect data from
|
|
* overwritable ring buffer. Read again.
|
|
*/
|
|
if (rec->evlist->bkw_mmap_state == BKW_MMAP_RUNNING)
|
|
continue;
|
|
trigger_ready(&switch_output_trigger);
|
|
|
|
/*
|
|
* Reenable events in overwrite ring buffer after
|
|
* record__mmap_read_all(): we should have collected
|
|
* data from it.
|
|
*/
|
|
perf_evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_RUNNING);
|
|
|
|
if (!quiet)
|
|
fprintf(stderr, "[ perf record: dump data: Woken up %ld times ]\n",
|
|
waking);
|
|
waking = 0;
|
|
fd = record__switch_output(rec, false);
|
|
if (fd < 0) {
|
|
pr_err("Failed to switch to new file\n");
|
|
trigger_error(&switch_output_trigger);
|
|
err = fd;
|
|
goto out_child;
|
|
}
|
|
|
|
/* re-arm the alarm */
|
|
if (rec->switch_output.time)
|
|
alarm(rec->switch_output.time);
|
|
}
|
|
|
|
if (hits == rec->samples) {
|
|
if (done || draining)
|
|
break;
|
|
err = perf_evlist__poll(rec->evlist, -1);
|
|
/*
|
|
* Propagate error, only if there's any. Ignore positive
|
|
* number of returned events and interrupt error.
|
|
*/
|
|
if (err > 0 || (err < 0 && errno == EINTR))
|
|
err = 0;
|
|
waking++;
|
|
|
|
if (perf_evlist__filter_pollfd(rec->evlist, POLLERR | POLLHUP) == 0)
|
|
draining = true;
|
|
}
|
|
|
|
/*
|
|
* When perf is starting the traced process, at the end events
|
|
* die with the process and we wait for that. Thus no need to
|
|
* disable events in this case.
|
|
*/
|
|
if (done && !disabled && !target__none(&opts->target)) {
|
|
trigger_off(&auxtrace_snapshot_trigger);
|
|
perf_evlist__disable(rec->evlist);
|
|
disabled = true;
|
|
}
|
|
}
|
|
trigger_off(&auxtrace_snapshot_trigger);
|
|
trigger_off(&switch_output_trigger);
|
|
|
|
if (forks && workload_exec_errno) {
|
|
char msg[STRERR_BUFSIZE];
|
|
const char *emsg = str_error_r(workload_exec_errno, msg, sizeof(msg));
|
|
pr_err("Workload failed: %s\n", emsg);
|
|
err = -1;
|
|
goto out_child;
|
|
}
|
|
|
|
if (!quiet)
|
|
fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
|
|
|
|
if (target__none(&rec->opts.target))
|
|
record__synthesize_workload(rec, true);
|
|
|
|
out_child:
|
|
if (forks) {
|
|
int exit_status;
|
|
|
|
if (!child_finished)
|
|
kill(rec->evlist->workload.pid, SIGTERM);
|
|
|
|
wait(&exit_status);
|
|
|
|
if (err < 0)
|
|
status = err;
|
|
else if (WIFEXITED(exit_status))
|
|
status = WEXITSTATUS(exit_status);
|
|
else if (WIFSIGNALED(exit_status))
|
|
signr = WTERMSIG(exit_status);
|
|
} else
|
|
status = err;
|
|
|
|
record__synthesize(rec, true);
|
|
/* this will be recalculated during process_buildids() */
|
|
rec->samples = 0;
|
|
|
|
if (!err) {
|
|
if (!rec->timestamp_filename) {
|
|
record__finish_output(rec);
|
|
} else {
|
|
fd = record__switch_output(rec, true);
|
|
if (fd < 0) {
|
|
status = fd;
|
|
goto out_delete_session;
|
|
}
|
|
}
|
|
}
|
|
|
|
perf_hooks__invoke_record_end();
|
|
|
|
if (!err && !quiet) {
|
|
char samples[128];
|
|
const char *postfix = rec->timestamp_filename ?
|
|
".<timestamp>" : "";
|
|
|
|
if (rec->samples && !rec->opts.full_auxtrace)
|
|
scnprintf(samples, sizeof(samples),
|
|
" (%" PRIu64 " samples)", rec->samples);
|
|
else
|
|
samples[0] = '\0';
|
|
|
|
fprintf(stderr, "[ perf record: Captured and wrote %.3f MB %s%s%s ]\n",
|
|
perf_data__size(data) / 1024.0 / 1024.0,
|
|
data->file.path, postfix, samples);
|
|
}
|
|
|
|
out_delete_session:
|
|
perf_session__delete(session);
|
|
return status;
|
|
}
|
|
|
|
static void callchain_debug(struct callchain_param *callchain)
|
|
{
|
|
static const char *str[CALLCHAIN_MAX] = { "NONE", "FP", "DWARF", "LBR" };
|
|
|
|
pr_debug("callchain: type %s\n", str[callchain->record_mode]);
|
|
|
|
if (callchain->record_mode == CALLCHAIN_DWARF)
|
|
pr_debug("callchain: stack dump size %d\n",
|
|
callchain->dump_size);
|
|
}
|
|
|
|
int record_opts__parse_callchain(struct record_opts *record,
|
|
struct callchain_param *callchain,
|
|
const char *arg, bool unset)
|
|
{
|
|
int ret;
|
|
callchain->enabled = !unset;
|
|
|
|
/* --no-call-graph */
|
|
if (unset) {
|
|
callchain->record_mode = CALLCHAIN_NONE;
|
|
pr_debug("callchain: disabled\n");
|
|
return 0;
|
|
}
|
|
|
|
ret = parse_callchain_record_opt(arg, callchain);
|
|
if (!ret) {
|
|
/* Enable data address sampling for DWARF unwind. */
|
|
if (callchain->record_mode == CALLCHAIN_DWARF)
|
|
record->sample_address = true;
|
|
callchain_debug(callchain);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int record_parse_callchain_opt(const struct option *opt,
|
|
const char *arg,
|
|
int unset)
|
|
{
|
|
return record_opts__parse_callchain(opt->value, &callchain_param, arg, unset);
|
|
}
|
|
|
|
int record_callchain_opt(const struct option *opt,
|
|
const char *arg __maybe_unused,
|
|
int unset __maybe_unused)
|
|
{
|
|
struct callchain_param *callchain = opt->value;
|
|
|
|
callchain->enabled = true;
|
|
|
|
if (callchain->record_mode == CALLCHAIN_NONE)
|
|
callchain->record_mode = CALLCHAIN_FP;
|
|
|
|
callchain_debug(callchain);
|
|
return 0;
|
|
}
|
|
|
|
static int perf_record_config(const char *var, const char *value, void *cb)
|
|
{
|
|
struct record *rec = cb;
|
|
|
|
if (!strcmp(var, "record.build-id")) {
|
|
if (!strcmp(value, "cache"))
|
|
rec->no_buildid_cache = false;
|
|
else if (!strcmp(value, "no-cache"))
|
|
rec->no_buildid_cache = true;
|
|
else if (!strcmp(value, "skip"))
|
|
rec->no_buildid = true;
|
|
else
|
|
return -1;
|
|
return 0;
|
|
}
|
|
if (!strcmp(var, "record.call-graph")) {
|
|
var = "call-graph.record-mode";
|
|
return perf_default_config(var, value, cb);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct clockid_map {
|
|
const char *name;
|
|
int clockid;
|
|
};
|
|
|
|
#define CLOCKID_MAP(n, c) \
|
|
{ .name = n, .clockid = (c), }
|
|
|
|
#define CLOCKID_END { .name = NULL, }
|
|
|
|
|
|
/*
|
|
* Add the missing ones, we need to build on many distros...
|
|
*/
|
|
#ifndef CLOCK_MONOTONIC_RAW
|
|
#define CLOCK_MONOTONIC_RAW 4
|
|
#endif
|
|
#ifndef CLOCK_BOOTTIME
|
|
#define CLOCK_BOOTTIME 7
|
|
#endif
|
|
#ifndef CLOCK_TAI
|
|
#define CLOCK_TAI 11
|
|
#endif
|
|
|
|
static const struct clockid_map clockids[] = {
|
|
/* available for all events, NMI safe */
|
|
CLOCKID_MAP("monotonic", CLOCK_MONOTONIC),
|
|
CLOCKID_MAP("monotonic_raw", CLOCK_MONOTONIC_RAW),
|
|
|
|
/* available for some events */
|
|
CLOCKID_MAP("realtime", CLOCK_REALTIME),
|
|
CLOCKID_MAP("boottime", CLOCK_BOOTTIME),
|
|
CLOCKID_MAP("tai", CLOCK_TAI),
|
|
|
|
/* available for the lazy */
|
|
CLOCKID_MAP("mono", CLOCK_MONOTONIC),
|
|
CLOCKID_MAP("raw", CLOCK_MONOTONIC_RAW),
|
|
CLOCKID_MAP("real", CLOCK_REALTIME),
|
|
CLOCKID_MAP("boot", CLOCK_BOOTTIME),
|
|
|
|
CLOCKID_END,
|
|
};
|
|
|
|
static int parse_clockid(const struct option *opt, const char *str, int unset)
|
|
{
|
|
struct record_opts *opts = (struct record_opts *)opt->value;
|
|
const struct clockid_map *cm;
|
|
const char *ostr = str;
|
|
|
|
if (unset) {
|
|
opts->use_clockid = 0;
|
|
return 0;
|
|
}
|
|
|
|
/* no arg passed */
|
|
if (!str)
|
|
return 0;
|
|
|
|
/* no setting it twice */
|
|
if (opts->use_clockid)
|
|
return -1;
|
|
|
|
opts->use_clockid = true;
|
|
|
|
/* if its a number, we're done */
|
|
if (sscanf(str, "%d", &opts->clockid) == 1)
|
|
return 0;
|
|
|
|
/* allow a "CLOCK_" prefix to the name */
|
|
if (!strncasecmp(str, "CLOCK_", 6))
|
|
str += 6;
|
|
|
|
for (cm = clockids; cm->name; cm++) {
|
|
if (!strcasecmp(str, cm->name)) {
|
|
opts->clockid = cm->clockid;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
opts->use_clockid = false;
|
|
ui__warning("unknown clockid %s, check man page\n", ostr);
|
|
return -1;
|
|
}
|
|
|
|
static int record__parse_mmap_pages(const struct option *opt,
|
|
const char *str,
|
|
int unset __maybe_unused)
|
|
{
|
|
struct record_opts *opts = opt->value;
|
|
char *s, *p;
|
|
unsigned int mmap_pages;
|
|
int ret;
|
|
|
|
if (!str)
|
|
return -EINVAL;
|
|
|
|
s = strdup(str);
|
|
if (!s)
|
|
return -ENOMEM;
|
|
|
|
p = strchr(s, ',');
|
|
if (p)
|
|
*p = '\0';
|
|
|
|
if (*s) {
|
|
ret = __perf_evlist__parse_mmap_pages(&mmap_pages, s);
|
|
if (ret)
|
|
goto out_free;
|
|
opts->mmap_pages = mmap_pages;
|
|
}
|
|
|
|
if (!p) {
|
|
ret = 0;
|
|
goto out_free;
|
|
}
|
|
|
|
ret = __perf_evlist__parse_mmap_pages(&mmap_pages, p + 1);
|
|
if (ret)
|
|
goto out_free;
|
|
|
|
opts->auxtrace_mmap_pages = mmap_pages;
|
|
|
|
out_free:
|
|
free(s);
|
|
return ret;
|
|
}
|
|
|
|
static void switch_output_size_warn(struct record *rec)
|
|
{
|
|
u64 wakeup_size = perf_evlist__mmap_size(rec->opts.mmap_pages);
|
|
struct switch_output *s = &rec->switch_output;
|
|
|
|
wakeup_size /= 2;
|
|
|
|
if (s->size < wakeup_size) {
|
|
char buf[100];
|
|
|
|
unit_number__scnprintf(buf, sizeof(buf), wakeup_size);
|
|
pr_warning("WARNING: switch-output data size lower than "
|
|
"wakeup kernel buffer size (%s) "
|
|
"expect bigger perf.data sizes\n", buf);
|
|
}
|
|
}
|
|
|
|
static int switch_output_setup(struct record *rec)
|
|
{
|
|
struct switch_output *s = &rec->switch_output;
|
|
static struct parse_tag tags_size[] = {
|
|
{ .tag = 'B', .mult = 1 },
|
|
{ .tag = 'K', .mult = 1 << 10 },
|
|
{ .tag = 'M', .mult = 1 << 20 },
|
|
{ .tag = 'G', .mult = 1 << 30 },
|
|
{ .tag = 0 },
|
|
};
|
|
static struct parse_tag tags_time[] = {
|
|
{ .tag = 's', .mult = 1 },
|
|
{ .tag = 'm', .mult = 60 },
|
|
{ .tag = 'h', .mult = 60*60 },
|
|
{ .tag = 'd', .mult = 60*60*24 },
|
|
{ .tag = 0 },
|
|
};
|
|
unsigned long val;
|
|
|
|
if (!s->set)
|
|
return 0;
|
|
|
|
if (!strcmp(s->str, "signal")) {
|
|
s->signal = true;
|
|
pr_debug("switch-output with SIGUSR2 signal\n");
|
|
goto enabled;
|
|
}
|
|
|
|
val = parse_tag_value(s->str, tags_size);
|
|
if (val != (unsigned long) -1) {
|
|
s->size = val;
|
|
pr_debug("switch-output with %s size threshold\n", s->str);
|
|
goto enabled;
|
|
}
|
|
|
|
val = parse_tag_value(s->str, tags_time);
|
|
if (val != (unsigned long) -1) {
|
|
s->time = val;
|
|
pr_debug("switch-output with %s time threshold (%lu seconds)\n",
|
|
s->str, s->time);
|
|
goto enabled;
|
|
}
|
|
|
|
return -1;
|
|
|
|
enabled:
|
|
rec->timestamp_filename = true;
|
|
s->enabled = true;
|
|
|
|
if (s->size && !rec->opts.no_buffering)
|
|
switch_output_size_warn(rec);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const char * const __record_usage[] = {
|
|
"perf record [<options>] [<command>]",
|
|
"perf record [<options>] -- <command> [<options>]",
|
|
NULL
|
|
};
|
|
const char * const *record_usage = __record_usage;
|
|
|
|
/*
|
|
* XXX Ideally would be local to cmd_record() and passed to a record__new
|
|
* because we need to have access to it in record__exit, that is called
|
|
* after cmd_record() exits, but since record_options need to be accessible to
|
|
* builtin-script, leave it here.
|
|
*
|
|
* At least we don't ouch it in all the other functions here directly.
|
|
*
|
|
* Just say no to tons of global variables, sigh.
|
|
*/
|
|
static struct record record = {
|
|
.opts = {
|
|
.sample_time = true,
|
|
.mmap_pages = UINT_MAX,
|
|
.user_freq = UINT_MAX,
|
|
.user_interval = ULLONG_MAX,
|
|
.freq = 4000,
|
|
.target = {
|
|
.uses_mmap = true,
|
|
.default_per_cpu = true,
|
|
},
|
|
.proc_map_timeout = 500,
|
|
},
|
|
.tool = {
|
|
.sample = process_sample_event,
|
|
.fork = perf_event__process_fork,
|
|
.exit = perf_event__process_exit,
|
|
.comm = perf_event__process_comm,
|
|
.namespaces = perf_event__process_namespaces,
|
|
.mmap = perf_event__process_mmap,
|
|
.mmap2 = perf_event__process_mmap2,
|
|
.ordered_events = true,
|
|
},
|
|
};
|
|
|
|
const char record_callchain_help[] = CALLCHAIN_RECORD_HELP
|
|
"\n\t\t\t\tDefault: fp";
|
|
|
|
static bool dry_run;
|
|
|
|
/*
|
|
* XXX Will stay a global variable till we fix builtin-script.c to stop messing
|
|
* with it and switch to use the library functions in perf_evlist that came
|
|
* from builtin-record.c, i.e. use record_opts,
|
|
* perf_evlist__prepare_workload, etc instead of fork+exec'in 'perf record',
|
|
* using pipes, etc.
|
|
*/
|
|
static struct option __record_options[] = {
|
|
OPT_CALLBACK('e', "event", &record.evlist, "event",
|
|
"event selector. use 'perf list' to list available events",
|
|
parse_events_option),
|
|
OPT_CALLBACK(0, "filter", &record.evlist, "filter",
|
|
"event filter", parse_filter),
|
|
OPT_CALLBACK_NOOPT(0, "exclude-perf", &record.evlist,
|
|
NULL, "don't record events from perf itself",
|
|
exclude_perf),
|
|
OPT_STRING('p', "pid", &record.opts.target.pid, "pid",
|
|
"record events on existing process id"),
|
|
OPT_STRING('t', "tid", &record.opts.target.tid, "tid",
|
|
"record events on existing thread id"),
|
|
OPT_INTEGER('r', "realtime", &record.realtime_prio,
|
|
"collect data with this RT SCHED_FIFO priority"),
|
|
OPT_BOOLEAN(0, "no-buffering", &record.opts.no_buffering,
|
|
"collect data without buffering"),
|
|
OPT_BOOLEAN('R', "raw-samples", &record.opts.raw_samples,
|
|
"collect raw sample records from all opened counters"),
|
|
OPT_BOOLEAN('a', "all-cpus", &record.opts.target.system_wide,
|
|
"system-wide collection from all CPUs"),
|
|
OPT_STRING('C', "cpu", &record.opts.target.cpu_list, "cpu",
|
|
"list of cpus to monitor"),
|
|
OPT_U64('c', "count", &record.opts.user_interval, "event period to sample"),
|
|
OPT_STRING('o', "output", &record.data.file.path, "file",
|
|
"output file name"),
|
|
OPT_BOOLEAN_SET('i', "no-inherit", &record.opts.no_inherit,
|
|
&record.opts.no_inherit_set,
|
|
"child tasks do not inherit counters"),
|
|
OPT_BOOLEAN(0, "tail-synthesize", &record.opts.tail_synthesize,
|
|
"synthesize non-sample events at the end of output"),
|
|
OPT_BOOLEAN(0, "overwrite", &record.opts.overwrite, "use overwrite mode"),
|
|
OPT_BOOLEAN(0, "strict-freq", &record.opts.strict_freq,
|
|
"Fail if the specified frequency can't be used"),
|
|
OPT_CALLBACK('F', "freq", &record.opts, "freq or 'max'",
|
|
"profile at this frequency",
|
|
record__parse_freq),
|
|
OPT_CALLBACK('m', "mmap-pages", &record.opts, "pages[,pages]",
|
|
"number of mmap data pages and AUX area tracing mmap pages",
|
|
record__parse_mmap_pages),
|
|
OPT_BOOLEAN(0, "group", &record.opts.group,
|
|
"put the counters into a counter group"),
|
|
OPT_CALLBACK_NOOPT('g', NULL, &callchain_param,
|
|
NULL, "enables call-graph recording" ,
|
|
&record_callchain_opt),
|
|
OPT_CALLBACK(0, "call-graph", &record.opts,
|
|
"record_mode[,record_size]", record_callchain_help,
|
|
&record_parse_callchain_opt),
|
|
OPT_INCR('v', "verbose", &verbose,
|
|
"be more verbose (show counter open errors, etc)"),
|
|
OPT_BOOLEAN('q', "quiet", &quiet, "don't print any message"),
|
|
OPT_BOOLEAN('s', "stat", &record.opts.inherit_stat,
|
|
"per thread counts"),
|
|
OPT_BOOLEAN('d', "data", &record.opts.sample_address, "Record the sample addresses"),
|
|
OPT_BOOLEAN(0, "phys-data", &record.opts.sample_phys_addr,
|
|
"Record the sample physical addresses"),
|
|
OPT_BOOLEAN(0, "sample-cpu", &record.opts.sample_cpu, "Record the sample cpu"),
|
|
OPT_BOOLEAN_SET('T', "timestamp", &record.opts.sample_time,
|
|
&record.opts.sample_time_set,
|
|
"Record the sample timestamps"),
|
|
OPT_BOOLEAN_SET('P', "period", &record.opts.period, &record.opts.period_set,
|
|
"Record the sample period"),
|
|
OPT_BOOLEAN('n', "no-samples", &record.opts.no_samples,
|
|
"don't sample"),
|
|
OPT_BOOLEAN_SET('N', "no-buildid-cache", &record.no_buildid_cache,
|
|
&record.no_buildid_cache_set,
|
|
"do not update the buildid cache"),
|
|
OPT_BOOLEAN_SET('B', "no-buildid", &record.no_buildid,
|
|
&record.no_buildid_set,
|
|
"do not collect buildids in perf.data"),
|
|
OPT_CALLBACK('G', "cgroup", &record.evlist, "name",
|
|
"monitor event in cgroup name only",
|
|
parse_cgroups),
|
|
OPT_UINTEGER('D', "delay", &record.opts.initial_delay,
|
|
"ms to wait before starting measurement after program start"),
|
|
OPT_STRING('u', "uid", &record.opts.target.uid_str, "user",
|
|
"user to profile"),
|
|
|
|
OPT_CALLBACK_NOOPT('b', "branch-any", &record.opts.branch_stack,
|
|
"branch any", "sample any taken branches",
|
|
parse_branch_stack),
|
|
|
|
OPT_CALLBACK('j', "branch-filter", &record.opts.branch_stack,
|
|
"branch filter mask", "branch stack filter modes",
|
|
parse_branch_stack),
|
|
OPT_BOOLEAN('W', "weight", &record.opts.sample_weight,
|
|
"sample by weight (on special events only)"),
|
|
OPT_BOOLEAN(0, "transaction", &record.opts.sample_transaction,
|
|
"sample transaction flags (special events only)"),
|
|
OPT_BOOLEAN(0, "per-thread", &record.opts.target.per_thread,
|
|
"use per-thread mmaps"),
|
|
OPT_CALLBACK_OPTARG('I', "intr-regs", &record.opts.sample_intr_regs, NULL, "any register",
|
|
"sample selected machine registers on interrupt,"
|
|
" use -I ? to list register names", parse_regs),
|
|
OPT_CALLBACK_OPTARG(0, "user-regs", &record.opts.sample_user_regs, NULL, "any register",
|
|
"sample selected machine registers on interrupt,"
|
|
" use -I ? to list register names", parse_regs),
|
|
OPT_BOOLEAN(0, "running-time", &record.opts.running_time,
|
|
"Record running/enabled time of read (:S) events"),
|
|
OPT_CALLBACK('k', "clockid", &record.opts,
|
|
"clockid", "clockid to use for events, see clock_gettime()",
|
|
parse_clockid),
|
|
OPT_STRING_OPTARG('S', "snapshot", &record.opts.auxtrace_snapshot_opts,
|
|
"opts", "AUX area tracing Snapshot Mode", ""),
|
|
OPT_UINTEGER(0, "proc-map-timeout", &record.opts.proc_map_timeout,
|
|
"per thread proc mmap processing timeout in ms"),
|
|
OPT_BOOLEAN(0, "namespaces", &record.opts.record_namespaces,
|
|
"Record namespaces events"),
|
|
OPT_BOOLEAN(0, "switch-events", &record.opts.record_switch_events,
|
|
"Record context switch events"),
|
|
OPT_BOOLEAN_FLAG(0, "all-kernel", &record.opts.all_kernel,
|
|
"Configure all used events to run in kernel space.",
|
|
PARSE_OPT_EXCLUSIVE),
|
|
OPT_BOOLEAN_FLAG(0, "all-user", &record.opts.all_user,
|
|
"Configure all used events to run in user space.",
|
|
PARSE_OPT_EXCLUSIVE),
|
|
OPT_STRING(0, "clang-path", &llvm_param.clang_path, "clang path",
|
|
"clang binary to use for compiling BPF scriptlets"),
|
|
OPT_STRING(0, "clang-opt", &llvm_param.clang_opt, "clang options",
|
|
"options passed to clang when compiling BPF scriptlets"),
|
|
OPT_STRING(0, "vmlinux", &symbol_conf.vmlinux_name,
|
|
"file", "vmlinux pathname"),
|
|
OPT_BOOLEAN(0, "buildid-all", &record.buildid_all,
|
|
"Record build-id of all DSOs regardless of hits"),
|
|
OPT_BOOLEAN(0, "timestamp-filename", &record.timestamp_filename,
|
|
"append timestamp to output filename"),
|
|
OPT_BOOLEAN(0, "timestamp-boundary", &record.timestamp_boundary,
|
|
"Record timestamp boundary (time of first/last samples)"),
|
|
OPT_STRING_OPTARG_SET(0, "switch-output", &record.switch_output.str,
|
|
&record.switch_output.set, "signal,size,time",
|
|
"Switch output when receive SIGUSR2 or cross size,time threshold",
|
|
"signal"),
|
|
OPT_BOOLEAN(0, "dry-run", &dry_run,
|
|
"Parse options then exit"),
|
|
OPT_END()
|
|
};
|
|
|
|
struct option *record_options = __record_options;
|
|
|
|
int cmd_record(int argc, const char **argv)
|
|
{
|
|
int err;
|
|
struct record *rec = &record;
|
|
char errbuf[BUFSIZ];
|
|
|
|
setlocale(LC_ALL, "");
|
|
|
|
#ifndef HAVE_LIBBPF_SUPPORT
|
|
# define set_nobuild(s, l, c) set_option_nobuild(record_options, s, l, "NO_LIBBPF=1", c)
|
|
set_nobuild('\0', "clang-path", true);
|
|
set_nobuild('\0', "clang-opt", true);
|
|
# undef set_nobuild
|
|
#endif
|
|
|
|
#ifndef HAVE_BPF_PROLOGUE
|
|
# if !defined (HAVE_DWARF_SUPPORT)
|
|
# define REASON "NO_DWARF=1"
|
|
# elif !defined (HAVE_LIBBPF_SUPPORT)
|
|
# define REASON "NO_LIBBPF=1"
|
|
# else
|
|
# define REASON "this architecture doesn't support BPF prologue"
|
|
# endif
|
|
# define set_nobuild(s, l, c) set_option_nobuild(record_options, s, l, REASON, c)
|
|
set_nobuild('\0', "vmlinux", true);
|
|
# undef set_nobuild
|
|
# undef REASON
|
|
#endif
|
|
|
|
rec->evlist = perf_evlist__new();
|
|
if (rec->evlist == NULL)
|
|
return -ENOMEM;
|
|
|
|
err = perf_config(perf_record_config, rec);
|
|
if (err)
|
|
return err;
|
|
|
|
argc = parse_options(argc, argv, record_options, record_usage,
|
|
PARSE_OPT_STOP_AT_NON_OPTION);
|
|
if (quiet)
|
|
perf_quiet_option();
|
|
|
|
/* Make system wide (-a) the default target. */
|
|
if (!argc && target__none(&rec->opts.target))
|
|
rec->opts.target.system_wide = true;
|
|
|
|
if (nr_cgroups && !rec->opts.target.system_wide) {
|
|
usage_with_options_msg(record_usage, record_options,
|
|
"cgroup monitoring only available in system-wide mode");
|
|
|
|
}
|
|
if (rec->opts.record_switch_events &&
|
|
!perf_can_record_switch_events()) {
|
|
ui__error("kernel does not support recording context switch events\n");
|
|
parse_options_usage(record_usage, record_options, "switch-events", 0);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (switch_output_setup(rec)) {
|
|
parse_options_usage(record_usage, record_options, "switch-output", 0);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (rec->switch_output.time) {
|
|
signal(SIGALRM, alarm_sig_handler);
|
|
alarm(rec->switch_output.time);
|
|
}
|
|
|
|
/*
|
|
* Allow aliases to facilitate the lookup of symbols for address
|
|
* filters. Refer to auxtrace_parse_filters().
|
|
*/
|
|
symbol_conf.allow_aliases = true;
|
|
|
|
symbol__init(NULL);
|
|
|
|
err = record__auxtrace_init(rec);
|
|
if (err)
|
|
goto out;
|
|
|
|
if (dry_run)
|
|
goto out;
|
|
|
|
err = bpf__setup_stdout(rec->evlist);
|
|
if (err) {
|
|
bpf__strerror_setup_stdout(rec->evlist, err, errbuf, sizeof(errbuf));
|
|
pr_err("ERROR: Setup BPF stdout failed: %s\n",
|
|
errbuf);
|
|
goto out;
|
|
}
|
|
|
|
err = -ENOMEM;
|
|
|
|
if (symbol_conf.kptr_restrict && !perf_evlist__exclude_kernel(rec->evlist))
|
|
pr_warning(
|
|
"WARNING: Kernel address maps (/proc/{kallsyms,modules}) are restricted,\n"
|
|
"check /proc/sys/kernel/kptr_restrict.\n\n"
|
|
"Samples in kernel functions may not be resolved if a suitable vmlinux\n"
|
|
"file is not found in the buildid cache or in the vmlinux path.\n\n"
|
|
"Samples in kernel modules won't be resolved at all.\n\n"
|
|
"If some relocation was applied (e.g. kexec) symbols may be misresolved\n"
|
|
"even with a suitable vmlinux or kallsyms file.\n\n");
|
|
|
|
if (rec->no_buildid_cache || rec->no_buildid) {
|
|
disable_buildid_cache();
|
|
} else if (rec->switch_output.enabled) {
|
|
/*
|
|
* In 'perf record --switch-output', disable buildid
|
|
* generation by default to reduce data file switching
|
|
* overhead. Still generate buildid if they are required
|
|
* explicitly using
|
|
*
|
|
* perf record --switch-output --no-no-buildid \
|
|
* --no-no-buildid-cache
|
|
*
|
|
* Following code equals to:
|
|
*
|
|
* if ((rec->no_buildid || !rec->no_buildid_set) &&
|
|
* (rec->no_buildid_cache || !rec->no_buildid_cache_set))
|
|
* disable_buildid_cache();
|
|
*/
|
|
bool disable = true;
|
|
|
|
if (rec->no_buildid_set && !rec->no_buildid)
|
|
disable = false;
|
|
if (rec->no_buildid_cache_set && !rec->no_buildid_cache)
|
|
disable = false;
|
|
if (disable) {
|
|
rec->no_buildid = true;
|
|
rec->no_buildid_cache = true;
|
|
disable_buildid_cache();
|
|
}
|
|
}
|
|
|
|
if (record.opts.overwrite)
|
|
record.opts.tail_synthesize = true;
|
|
|
|
if (rec->evlist->nr_entries == 0 &&
|
|
__perf_evlist__add_default(rec->evlist, !record.opts.no_samples) < 0) {
|
|
pr_err("Not enough memory for event selector list\n");
|
|
goto out;
|
|
}
|
|
|
|
if (rec->opts.target.tid && !rec->opts.no_inherit_set)
|
|
rec->opts.no_inherit = true;
|
|
|
|
err = target__validate(&rec->opts.target);
|
|
if (err) {
|
|
target__strerror(&rec->opts.target, err, errbuf, BUFSIZ);
|
|
ui__warning("%s\n", errbuf);
|
|
}
|
|
|
|
err = target__parse_uid(&rec->opts.target);
|
|
if (err) {
|
|
int saved_errno = errno;
|
|
|
|
target__strerror(&rec->opts.target, err, errbuf, BUFSIZ);
|
|
ui__error("%s", errbuf);
|
|
|
|
err = -saved_errno;
|
|
goto out;
|
|
}
|
|
|
|
/* Enable ignoring missing threads when -u/-p option is defined. */
|
|
rec->opts.ignore_missing_thread = rec->opts.target.uid != UINT_MAX || rec->opts.target.pid;
|
|
|
|
err = -ENOMEM;
|
|
if (perf_evlist__create_maps(rec->evlist, &rec->opts.target) < 0)
|
|
usage_with_options(record_usage, record_options);
|
|
|
|
err = auxtrace_record__options(rec->itr, rec->evlist, &rec->opts);
|
|
if (err)
|
|
goto out;
|
|
|
|
/*
|
|
* We take all buildids when the file contains
|
|
* AUX area tracing data because we do not decode the
|
|
* trace because it would take too long.
|
|
*/
|
|
if (rec->opts.full_auxtrace)
|
|
rec->buildid_all = true;
|
|
|
|
if (record_opts__config(&rec->opts)) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
err = __cmd_record(&record, argc, argv);
|
|
out:
|
|
perf_evlist__delete(rec->evlist);
|
|
symbol__exit();
|
|
auxtrace_record__free(rec->itr);
|
|
return err;
|
|
}
|
|
|
|
static void snapshot_sig_handler(int sig __maybe_unused)
|
|
{
|
|
struct record *rec = &record;
|
|
|
|
if (trigger_is_ready(&auxtrace_snapshot_trigger)) {
|
|
trigger_hit(&auxtrace_snapshot_trigger);
|
|
auxtrace_record__snapshot_started = 1;
|
|
if (auxtrace_record__snapshot_start(record.itr))
|
|
trigger_error(&auxtrace_snapshot_trigger);
|
|
}
|
|
|
|
if (switch_output_signal(rec))
|
|
trigger_hit(&switch_output_trigger);
|
|
}
|
|
|
|
static void alarm_sig_handler(int sig __maybe_unused)
|
|
{
|
|
struct record *rec = &record;
|
|
|
|
if (switch_output_time(rec))
|
|
trigger_hit(&switch_output_trigger);
|
|
}
|