mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-10 07:16:39 +07:00
f15eb531d3
Now perf trace is able to trace specified workload by forking it like perf record does. And also finish the tracing if the workload quits or gets SIGINT. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1349413336-26936-5-git-send-email-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
380 lines
9.3 KiB
C
380 lines
9.3 KiB
C
#include "builtin.h"
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#include "util/evlist.h"
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#include "util/parse-options.h"
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#include "util/thread_map.h"
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#include "event-parse.h"
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#include <libaudit.h>
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#include <stdlib.h>
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static struct syscall_fmt {
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const char *name;
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const char *alias;
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bool errmsg;
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bool timeout;
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} syscall_fmts[] = {
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{ .name = "arch_prctl", .errmsg = true, .alias = "prctl", },
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{ .name = "fstat", .errmsg = true, .alias = "newfstat", },
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{ .name = "fstatat", .errmsg = true, .alias = "newfstatat", },
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{ .name = "futex", .errmsg = true, },
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{ .name = "poll", .errmsg = true, .timeout = true, },
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{ .name = "ppoll", .errmsg = true, .timeout = true, },
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{ .name = "read", .errmsg = true, },
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{ .name = "recvfrom", .errmsg = true, },
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{ .name = "select", .errmsg = true, .timeout = true, },
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{ .name = "stat", .errmsg = true, .alias = "newstat", },
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};
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static int syscall_fmt__cmp(const void *name, const void *fmtp)
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{
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const struct syscall_fmt *fmt = fmtp;
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return strcmp(name, fmt->name);
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}
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static struct syscall_fmt *syscall_fmt__find(const char *name)
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{
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const int nmemb = ARRAY_SIZE(syscall_fmts);
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return bsearch(name, syscall_fmts, nmemb, sizeof(struct syscall_fmt), syscall_fmt__cmp);
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}
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struct syscall {
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struct event_format *tp_format;
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const char *name;
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struct syscall_fmt *fmt;
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};
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struct trace {
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int audit_machine;
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struct {
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int max;
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struct syscall *table;
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} syscalls;
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struct perf_record_opts opts;
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};
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static bool done = false;
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static void sig_handler(int sig __maybe_unused)
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{
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done = true;
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}
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static int trace__read_syscall_info(struct trace *trace, int id)
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{
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char tp_name[128];
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struct syscall *sc;
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if (id > trace->syscalls.max) {
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struct syscall *nsyscalls = realloc(trace->syscalls.table, (id + 1) * sizeof(*sc));
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if (nsyscalls == NULL)
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return -1;
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if (trace->syscalls.max != -1) {
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memset(nsyscalls + trace->syscalls.max + 1, 0,
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(id - trace->syscalls.max) * sizeof(*sc));
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} else {
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memset(nsyscalls, 0, (id + 1) * sizeof(*sc));
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}
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trace->syscalls.table = nsyscalls;
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trace->syscalls.max = id;
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}
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sc = trace->syscalls.table + id;
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sc->name = audit_syscall_to_name(id, trace->audit_machine);
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if (sc->name == NULL)
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return -1;
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sc->fmt = syscall_fmt__find(sc->name);
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snprintf(tp_name, sizeof(tp_name), "sys_enter_%s", sc->name);
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sc->tp_format = event_format__new("syscalls", tp_name);
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if (sc->tp_format == NULL && sc->fmt && sc->fmt->alias) {
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snprintf(tp_name, sizeof(tp_name), "sys_enter_%s", sc->fmt->alias);
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sc->tp_format = event_format__new("syscalls", tp_name);
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}
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return sc->tp_format != NULL ? 0 : -1;
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}
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static size_t syscall__fprintf_args(struct syscall *sc, unsigned long *args, FILE *fp)
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{
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int i = 0;
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size_t printed = 0;
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if (sc->tp_format != NULL) {
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struct format_field *field;
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for (field = sc->tp_format->format.fields->next; field; field = field->next) {
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printed += fprintf(fp, "%s%s: %ld", printed ? ", " : "",
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field->name, args[i++]);
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}
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} else {
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while (i < 6) {
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printed += fprintf(fp, "%sarg%d: %ld", printed ? ", " : "", i, args[i]);
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++i;
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}
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}
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return printed;
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}
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typedef int (*tracepoint_handler)(struct trace *trace, struct perf_evsel *evsel,
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struct perf_sample *sample);
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static struct syscall *trace__syscall_info(struct trace *trace,
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struct perf_evsel *evsel,
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struct perf_sample *sample)
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{
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int id = perf_evsel__intval(evsel, sample, "id");
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if (id < 0) {
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printf("Invalid syscall %d id, skipping...\n", id);
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return NULL;
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}
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if ((id > trace->syscalls.max || trace->syscalls.table[id].name == NULL) &&
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trace__read_syscall_info(trace, id))
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goto out_cant_read;
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if ((id > trace->syscalls.max || trace->syscalls.table[id].name == NULL))
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goto out_cant_read;
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return &trace->syscalls.table[id];
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out_cant_read:
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printf("Problems reading syscall %d information\n", id);
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return NULL;
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}
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static int trace__sys_enter(struct trace *trace, struct perf_evsel *evsel,
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struct perf_sample *sample)
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{
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void *args;
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struct syscall *sc = trace__syscall_info(trace, evsel, sample);
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if (sc == NULL)
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return -1;
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args = perf_evsel__rawptr(evsel, sample, "args");
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if (args == NULL) {
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printf("Problems reading syscall arguments\n");
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return -1;
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}
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printf("%s(", sc->name);
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syscall__fprintf_args(sc, args, stdout);
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return 0;
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}
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static int trace__sys_exit(struct trace *trace, struct perf_evsel *evsel,
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struct perf_sample *sample)
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{
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int ret;
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struct syscall *sc = trace__syscall_info(trace, evsel, sample);
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if (sc == NULL)
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return -1;
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ret = perf_evsel__intval(evsel, sample, "ret");
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if (ret < 0 && sc->fmt && sc->fmt->errmsg) {
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char bf[256];
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const char *emsg = strerror_r(-ret, bf, sizeof(bf)),
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*e = audit_errno_to_name(-ret);
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printf(") = -1 %s %s", e, emsg);
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} else if (ret == 0 && sc->fmt && sc->fmt->timeout)
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printf(") = 0 Timeout");
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else
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printf(") = %d", ret);
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putchar('\n');
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return 0;
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}
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static int trace__run(struct trace *trace, int argc, const char **argv)
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{
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struct perf_evlist *evlist = perf_evlist__new(NULL, NULL);
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struct perf_evsel *evsel;
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int err = -1, i, nr_events = 0, before;
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const bool forks = argc > 0;
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if (evlist == NULL) {
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printf("Not enough memory to run!\n");
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goto out;
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}
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if (perf_evlist__add_newtp(evlist, "raw_syscalls", "sys_enter", trace__sys_enter) ||
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perf_evlist__add_newtp(evlist, "raw_syscalls", "sys_exit", trace__sys_exit)) {
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printf("Couldn't read the raw_syscalls tracepoints information!\n");
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goto out_delete_evlist;
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}
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err = perf_evlist__create_maps(evlist, &trace->opts.target);
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if (err < 0) {
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printf("Problems parsing the target to trace, check your options!\n");
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goto out_delete_evlist;
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}
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perf_evlist__config_attrs(evlist, &trace->opts);
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signal(SIGCHLD, sig_handler);
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signal(SIGINT, sig_handler);
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if (forks) {
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err = perf_evlist__prepare_workload(evlist, &trace->opts, argv);
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if (err < 0) {
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printf("Couldn't run the workload!\n");
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goto out_delete_evlist;
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}
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}
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err = perf_evlist__open(evlist);
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if (err < 0) {
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printf("Couldn't create the events: %s\n", strerror(errno));
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goto out_delete_evlist;
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}
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err = perf_evlist__mmap(evlist, UINT_MAX, false);
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if (err < 0) {
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printf("Couldn't mmap the events: %s\n", strerror(errno));
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goto out_delete_evlist;
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}
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perf_evlist__enable(evlist);
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if (forks)
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perf_evlist__start_workload(evlist);
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again:
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before = nr_events;
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for (i = 0; i < evlist->nr_mmaps; i++) {
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union perf_event *event;
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while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
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const u32 type = event->header.type;
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tracepoint_handler handler;
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struct perf_sample sample;
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++nr_events;
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switch (type) {
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case PERF_RECORD_SAMPLE:
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break;
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case PERF_RECORD_LOST:
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printf("LOST %" PRIu64 " events!\n", event->lost.lost);
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continue;
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default:
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printf("Unexpected %s event, skipping...\n",
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perf_event__name(type));
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continue;
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}
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err = perf_evlist__parse_sample(evlist, event, &sample);
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if (err) {
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printf("Can't parse sample, err = %d, skipping...\n", err);
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continue;
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}
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evsel = perf_evlist__id2evsel(evlist, sample.id);
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if (evsel == NULL) {
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printf("Unknown tp ID %" PRIu64 ", skipping...\n", sample.id);
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continue;
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}
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if (evlist->threads->map[0] == -1 || evlist->threads->nr > 1)
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printf("%d ", sample.tid);
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handler = evsel->handler.func;
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handler(trace, evsel, &sample);
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}
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}
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if (nr_events == before) {
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if (done)
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goto out_delete_evlist;
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poll(evlist->pollfd, evlist->nr_fds, -1);
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}
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if (done)
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perf_evlist__disable(evlist);
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goto again;
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out_delete_evlist:
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perf_evlist__delete(evlist);
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out:
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return err;
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}
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int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
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{
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const char * const trace_usage[] = {
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"perf trace [<options>] [<command>]",
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"perf trace [<options>] -- <command> [<options>]",
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NULL
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};
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struct trace trace = {
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.audit_machine = audit_detect_machine(),
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.syscalls = {
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. max = -1,
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},
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.opts = {
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.target = {
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.uid = UINT_MAX,
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.uses_mmap = true,
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},
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.user_freq = UINT_MAX,
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.user_interval = ULLONG_MAX,
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.no_delay = true,
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.mmap_pages = 1024,
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},
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};
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const struct option trace_options[] = {
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OPT_STRING('p', "pid", &trace.opts.target.pid, "pid",
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"trace events on existing process id"),
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OPT_STRING(0, "tid", &trace.opts.target.tid, "tid",
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"trace events on existing thread id"),
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OPT_BOOLEAN(0, "all-cpus", &trace.opts.target.system_wide,
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"system-wide collection from all CPUs"),
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OPT_STRING(0, "cpu", &trace.opts.target.cpu_list, "cpu",
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"list of cpus to monitor"),
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OPT_BOOLEAN(0, "no-inherit", &trace.opts.no_inherit,
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"child tasks do not inherit counters"),
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OPT_UINTEGER(0, "mmap-pages", &trace.opts.mmap_pages,
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"number of mmap data pages"),
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OPT_STRING(0, "uid", &trace.opts.target.uid_str, "user",
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"user to profile"),
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OPT_END()
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};
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int err;
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char bf[BUFSIZ];
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argc = parse_options(argc, argv, trace_options, trace_usage, 0);
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err = perf_target__validate(&trace.opts.target);
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if (err) {
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perf_target__strerror(&trace.opts.target, err, bf, sizeof(bf));
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printf("%s", bf);
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return err;
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}
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err = perf_target__parse_uid(&trace.opts.target);
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if (err) {
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perf_target__strerror(&trace.opts.target, err, bf, sizeof(bf));
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printf("%s", bf);
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return err;
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}
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if (!argc && perf_target__none(&trace.opts.target))
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trace.opts.target.system_wide = true;
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return trace__run(&trace, argc, argv);
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}
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