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https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
perf trace: Support interrupted syscalls
Using the same strategies as in the tmp.perf/trace2, i.e. the 'trace'
tool implemented by tglx, just updated to the current codebase.
Example:
[root@sandy linux]# perf trace usleep 1 | tail
2.003: mmap(addr: 0, len: 4096, prot: 3, flags: 34, fd: 4294967295, off: 0 ) = -2128396288
2.017: mmap(addr: 0, len: 4096, prot: 3, flags: 34, fd: 4294967295, off: 0 ) = -2128400384
2.029: arch_prctl(option: 4098, arg2: 140146949441280, arg3: 140146949435392, arg4: 34, arg5: 4294967295) = 0
2.084: mprotect(start: 208741634048, len: 16384, prot: 1 ) = 0
2.098: mprotect(start: 208735956992, len: 4096, prot: 1 ) = 0
2.122: munmap(addr: 140146949447680, len: 91882 ) = 0
2.359: brk(brk: 0 ) = 28987392
2.371: brk(brk: 29122560 ) = 29122560
2.490: nanosleep(rqtp: 140735694241504, rmtp: 0 ) = 0
2.507: exit_group(error_code: 0
[root@sandy linux]#
For now the timestamp and duration are always on, will be selectable.
Also if multiple threads are being monitored, its tid will appear.
The ret output continues to be interpreted a la strace.
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-ly9ulroru4my5isn0xe9gr0m@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo
parent
9a8e85ad0b
commit
752fde44fd
2 changed files with 181 additions and 22 deletions
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@ -1,5 +1,8 @@
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#include "builtin.h"
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#include "util/color.h"
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#include "util/evlist.h"
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#include "util/machine.h"
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#include "util/thread.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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@ -43,6 +46,36 @@ struct syscall {
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struct syscall_fmt *fmt;
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};
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struct thread_trace {
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u64 entry_time;
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u64 exit_time;
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bool entry_pending;
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char *entry_str;
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};
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static struct thread_trace *thread_trace__new(void)
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{
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return zalloc(sizeof(struct thread_trace));
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}
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static struct thread_trace *thread__trace(struct thread *thread)
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{
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if (thread == NULL)
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goto fail;
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if (thread->priv == NULL)
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thread->priv = thread_trace__new();
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if (thread->priv == NULL)
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goto fail;
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return thread->priv;
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fail:
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color_fprintf(stdout, PERF_COLOR_RED,
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"WARNING: not enough memory, dropping samples!\n");
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return NULL;
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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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@ -50,8 +83,18 @@ struct trace {
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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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struct machine host;
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u64 base_time;
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bool multiple_threads;
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};
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static size_t trace__fprintf_tstamp(struct trace *trace, u64 tstamp, FILE *fp)
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{
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double ts = (double)(tstamp - trace->base_time) / NSEC_PER_MSEC;
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return fprintf(fp, "%10.3f: ", ts);
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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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@ -59,6 +102,67 @@ static void sig_handler(int sig __maybe_unused)
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done = true;
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}
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static size_t trace__fprintf_entry_head(struct trace *trace, struct thread *thread,
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u64 tstamp, FILE *fp)
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{
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size_t printed = trace__fprintf_tstamp(trace, tstamp, fp);
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if (trace->multiple_threads)
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printed += fprintf(fp, "%d ", thread->pid);
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return printed;
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}
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static int trace__process_event(struct machine *machine, union perf_event *event)
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{
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int ret = 0;
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switch (event->header.type) {
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case PERF_RECORD_LOST:
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color_fprintf(stdout, PERF_COLOR_RED,
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"LOST %" PRIu64 " events!\n", event->lost.lost);
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ret = machine__process_lost_event(machine, event);
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default:
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ret = machine__process_event(machine, event);
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break;
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}
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return ret;
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}
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static int trace__tool_process(struct perf_tool *tool __maybe_unused,
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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)
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{
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return trace__process_event(machine, event);
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}
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static int trace__symbols_init(struct trace *trace, struct perf_evlist *evlist)
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{
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int err = symbol__init();
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if (err)
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return err;
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machine__init(&trace->host, "", HOST_KERNEL_ID);
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machine__create_kernel_maps(&trace->host);
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if (perf_target__has_task(&trace->opts.target)) {
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err = perf_event__synthesize_thread_map(NULL, evlist->threads,
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trace__tool_process,
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&trace->host);
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} else {
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err = perf_event__synthesize_threads(NULL, trace__tool_process,
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&trace->host);
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}
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if (err)
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symbol__exit();
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return err;
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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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@ -100,7 +204,8 @@ static int trace__read_syscall_info(struct trace *trace, int id)
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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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static size_t syscall__scnprintf_args(struct syscall *sc, char *bf, size_t size,
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unsigned long *args)
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{
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int i = 0;
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size_t printed = 0;
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@ -109,12 +214,15 @@ static size_t syscall__fprintf_args(struct syscall *sc, unsigned long *args, FIL
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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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printed += scnprintf(bf + printed, size - printed,
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"%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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printed += scnprintf(bf + printed, size - printed,
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"%sarg%d: %ld",
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printed ? ", " : "", i, args[i]);
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++i;
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}
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}
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@ -153,10 +261,14 @@ static struct syscall *trace__syscall_info(struct trace *trace,
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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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char *msg;
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void *args;
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size_t printed = 0;
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struct thread *thread = machine__findnew_thread(&trace->host, sample->tid);
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struct syscall *sc = trace__syscall_info(trace, evsel, sample);
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struct thread_trace *ttrace = thread__trace(thread);
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if (sc == NULL)
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if (ttrace == NULL || sc == NULL)
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return -1;
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args = perf_evsel__rawptr(evsel, sample, "args");
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@ -165,8 +277,25 @@ static int trace__sys_enter(struct trace *trace, struct perf_evsel *evsel,
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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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ttrace = thread->priv;
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if (ttrace->entry_str == NULL) {
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ttrace->entry_str = malloc(1024);
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if (!ttrace->entry_str)
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return -1;
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}
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ttrace->entry_time = sample->time;
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msg = ttrace->entry_str;
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printed += scnprintf(msg + printed, 1024 - printed, "%s(", sc->name);
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printed += syscall__scnprintf_args(sc, msg + printed, 1024 - printed, args);
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if (!strcmp(sc->name, "exit_group") || !strcmp(sc->name, "exit")) {
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trace__fprintf_entry_head(trace, thread, sample->time, stdout);
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printf("%-70s\n", ttrace->entry_str);
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} else
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ttrace->entry_pending = true;
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return 0;
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}
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@ -175,13 +304,29 @@ 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 thread *thread = machine__findnew_thread(&trace->host, sample->tid);
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struct thread_trace *ttrace = thread__trace(thread);
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struct syscall *sc = trace__syscall_info(trace, evsel, sample);
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if (sc == NULL)
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if (ttrace == NULL || sc == NULL)
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return -1;
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ret = perf_evsel__intval(evsel, sample, "ret");
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ttrace = thread->priv;
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ttrace->exit_time = sample->time;
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trace__fprintf_entry_head(trace, thread, sample->time, stdout);
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if (ttrace->entry_pending) {
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printf("%-70s", ttrace->entry_str);
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} else {
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printf(" ... [");
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color_fprintf(stdout, PERF_COLOR_YELLOW, "continued");
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printf("]: %s()", sc->name);
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}
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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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@ -194,6 +339,9 @@ static int trace__sys_exit(struct trace *trace, struct perf_evsel *evsel,
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printf(") = %d", ret);
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putchar('\n');
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ttrace->entry_pending = false;
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return 0;
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}
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@ -221,6 +369,12 @@ static int trace__run(struct trace *trace, int argc, const char **argv)
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goto out_delete_evlist;
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}
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err = trace__symbols_init(trace, evlist);
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if (err < 0) {
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printf("Problems initializing symbol libraries!\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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@ -251,6 +405,7 @@ static int trace__run(struct trace *trace, int argc, const char **argv)
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if (forks)
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perf_evlist__start_workload(evlist);
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trace->multiple_threads = evlist->threads->map[0] == -1 || evlist->threads->nr > 1;
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again:
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before = nr_events;
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@ -264,32 +419,32 @@ static int trace__run(struct trace *trace, int argc, const char **argv)
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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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if (trace->base_time == 0)
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trace->base_time = sample.time;
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if (type != PERF_RECORD_SAMPLE) {
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trace__process_event(&trace->host, event);
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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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if (sample.raw_data == NULL) {
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printf("%s sample with no payload for tid: %d, cpu %d, raw_size=%d, skipping...\n",
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perf_evsel__name(evsel), sample.tid,
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sample.cpu, sample.raw_size);
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continue;
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}
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if (sample.raw_data == NULL) {
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printf("%s sample with no payload for tid: %d, cpu %d, raw_size=%d, skipping...\n",
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@ -198,6 +198,10 @@ static inline int has_extension(const char *filename, const char *ext)
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#undef tolower
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#undef toupper
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#ifndef NSEC_PER_MSEC
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#define NSEC_PER_MSEC 1000000L
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#endif
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extern unsigned char sane_ctype[256];
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#define GIT_SPACE 0x01
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#define GIT_DIGIT 0x02
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