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Diffstat (limited to 'tools/perf/builtin-trace.c')
-rw-r--r--tools/perf/builtin-trace.c196
1 files changed, 126 insertions, 70 deletions
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index d0f91fe755a3d..fa620bc1db69b 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -951,7 +951,10 @@ fail:
struct trace {
struct perf_tool tool;
- int audit_machine;
+ struct {
+ int machine;
+ int open_id;
+ } audit;
struct {
int max;
struct syscall *table;
@@ -965,40 +968,24 @@ struct trace {
struct strlist *ev_qualifier;
bool not_ev_qualifier;
bool live;
+ const char *last_vfs_getname;
struct intlist *tid_list;
struct intlist *pid_list;
bool sched;
bool multiple_threads;
bool summary;
bool show_comm;
+ bool show_tool_stats;
double duration_filter;
double runtime_ms;
+ struct {
+ u64 vfs_getname, proc_getname;
+ } stats;
};
-static int thread__read_fd_path(struct thread *thread, int fd)
+static int trace__set_fd_pathname(struct thread *thread, int fd, const char *pathname)
{
struct thread_trace *ttrace = thread->priv;
- char linkname[PATH_MAX], pathname[PATH_MAX];
- struct stat st;
- int ret;
-
- if (thread->pid_ == thread->tid) {
- scnprintf(linkname, sizeof(linkname),
- "/proc/%d/fd/%d", thread->pid_, fd);
- } else {
- scnprintf(linkname, sizeof(linkname),
- "/proc/%d/task/%d/fd/%d", thread->pid_, thread->tid, fd);
- }
-
- if (lstat(linkname, &st) < 0 || st.st_size + 1 > (off_t)sizeof(pathname))
- return -1;
-
- ret = readlink(linkname, pathname, sizeof(pathname));
-
- if (ret < 0 || ret > st.st_size)
- return -1;
-
- pathname[ret] = '\0';
if (fd > ttrace->paths.max) {
char **npath = realloc(ttrace->paths.table, (fd + 1) * sizeof(char *));
@@ -1022,7 +1009,34 @@ static int thread__read_fd_path(struct thread *thread, int fd)
return ttrace->paths.table[fd] != NULL ? 0 : -1;
}
-static const char *thread__fd_path(struct thread *thread, int fd, bool live)
+static int thread__read_fd_path(struct thread *thread, int fd)
+{
+ char linkname[PATH_MAX], pathname[PATH_MAX];
+ struct stat st;
+ int ret;
+
+ if (thread->pid_ == thread->tid) {
+ scnprintf(linkname, sizeof(linkname),
+ "/proc/%d/fd/%d", thread->pid_, fd);
+ } else {
+ scnprintf(linkname, sizeof(linkname),
+ "/proc/%d/task/%d/fd/%d", thread->pid_, thread->tid, fd);
+ }
+
+ if (lstat(linkname, &st) < 0 || st.st_size + 1 > (off_t)sizeof(pathname))
+ return -1;
+
+ ret = readlink(linkname, pathname, sizeof(pathname));
+
+ if (ret < 0 || ret > st.st_size)
+ return -1;
+
+ pathname[ret] = '\0';
+ return trace__set_fd_pathname(thread, fd, pathname);
+}
+
+static const char *thread__fd_path(struct thread *thread, int fd,
+ struct trace *trace)
{
struct thread_trace *ttrace = thread->priv;
@@ -1032,9 +1046,13 @@ static const char *thread__fd_path(struct thread *thread, int fd, bool live)
if (fd < 0)
return NULL;
- if ((fd > ttrace->paths.max || ttrace->paths.table[fd] == NULL) &&
- (!live || thread__read_fd_path(thread, fd)))
- return NULL;
+ if ((fd > ttrace->paths.max || ttrace->paths.table[fd] == NULL))
+ if (!trace->live)
+ return NULL;
+ ++trace->stats.proc_getname;
+ if (thread__read_fd_path(thread, fd)) {
+ return NULL;
+ }
return ttrace->paths.table[fd];
}
@@ -1044,7 +1062,7 @@ static size_t syscall_arg__scnprintf_fd(char *bf, size_t size,
{
int fd = arg->val;
size_t printed = scnprintf(bf, size, "%d", fd);
- const char *path = thread__fd_path(arg->thread, fd, arg->trace->live);
+ const char *path = thread__fd_path(arg->thread, fd, arg->trace);
if (path)
printed += scnprintf(bf + printed, size - printed, "<%s>", path);
@@ -1080,10 +1098,12 @@ static size_t trace__fprintf_tstamp(struct trace *trace, u64 tstamp, FILE *fp)
}
static bool done = false;
+static bool interrupted = false;
-static void sig_handler(int sig __maybe_unused)
+static void sig_handler(int sig)
{
done = true;
+ interrupted = sig == SIGINT;
}
static size_t trace__fprintf_entry_head(struct trace *trace, struct thread *thread,
@@ -1181,7 +1201,7 @@ static int trace__read_syscall_info(struct trace *trace, int id)
{
char tp_name[128];
struct syscall *sc;
- const char *name = audit_syscall_to_name(id, trace->audit_machine);
+ const char *name = audit_syscall_to_name(id, trace->audit.machine);
if (name == NULL)
return -1;
@@ -1445,6 +1465,12 @@ static int trace__sys_exit(struct trace *trace, struct perf_evsel *evsel,
ret = perf_evsel__intval(evsel, sample, "ret");
+ if (id == trace->audit.open_id && ret >= 0 && trace->last_vfs_getname) {
+ trace__set_fd_pathname(thread, ret, trace->last_vfs_getname);
+ trace->last_vfs_getname = NULL;
+ ++trace->stats.vfs_getname;
+ }
+
ttrace = thread->priv;
ttrace->exit_time = sample->time;
@@ -1489,6 +1515,13 @@ out:
return 0;
}
+static int trace__vfs_getname(struct trace *trace, struct perf_evsel *evsel,
+ struct perf_sample *sample)
+{
+ trace->last_vfs_getname = perf_evsel__rawptr(evsel, sample, "pathname");
+ return 0;
+}
+
static int trace__sched_stat_runtime(struct trace *trace, struct perf_evsel *evsel,
struct perf_sample *sample)
{
@@ -1611,6 +1644,22 @@ static int trace__record(int argc, const char **argv)
static size_t trace__fprintf_thread_summary(struct trace *trace, FILE *fp);
+static void perf_evlist__add_vfs_getname(struct perf_evlist *evlist)
+{
+ struct perf_evsel *evsel = perf_evsel__newtp("probe", "vfs_getname",
+ evlist->nr_entries);
+ if (evsel == NULL)
+ return;
+
+ if (perf_evsel__field(evsel, "pathname") == NULL) {
+ perf_evsel__delete(evsel);
+ return;
+ }
+
+ evsel->handler.func = trace__vfs_getname;
+ perf_evlist__add(evlist, evsel);
+}
+
static int trace__run(struct trace *trace, int argc, const char **argv)
{
struct perf_evlist *evlist = perf_evlist__new();
@@ -1630,6 +1679,8 @@ static int trace__run(struct trace *trace, int argc, const char **argv)
perf_evlist__add_newtp(evlist, "raw_syscalls", "sys_exit", trace__sys_exit))
goto out_error_tp;
+ perf_evlist__add_vfs_getname(evlist);
+
if (trace->sched &&
perf_evlist__add_newtp(evlist, "sched", "sched_stat_runtime",
trace__sched_stat_runtime))
@@ -1662,10 +1713,8 @@ static int trace__run(struct trace *trace, int argc, const char **argv)
}
err = perf_evlist__open(evlist);
- if (err < 0) {
- fprintf(trace->output, "Couldn't create the events: %s\n", strerror(errno));
- goto out_delete_maps;
- }
+ if (err < 0)
+ goto out_error_open;
err = perf_evlist__mmap(evlist, UINT_MAX, false);
if (err < 0) {
@@ -1722,26 +1771,35 @@ again:
handler = evsel->handler.func;
handler(trace, evsel, &sample);
- if (done)
- goto out_unmap_evlist;
+ if (interrupted)
+ goto out_disable;
}
}
if (trace->nr_events == before) {
- if (done)
- goto out_unmap_evlist;
+ int timeout = done ? 100 : -1;
- poll(evlist->pollfd, evlist->nr_fds, -1);
+ if (poll(evlist->pollfd, evlist->nr_fds, timeout) > 0)
+ goto again;
+ } else {
+ goto again;
}
- if (done)
- perf_evlist__disable(evlist);
+out_disable:
+ perf_evlist__disable(evlist);
- goto again;
+ if (!err) {
+ if (trace->summary)
+ trace__fprintf_thread_summary(trace, trace->output);
-out_unmap_evlist:
- if (!err && trace->summary)
- trace__fprintf_thread_summary(trace, trace->output);
+ if (trace->show_tool_stats) {
+ fprintf(trace->output, "Stats:\n "
+ " vfs_getname : %" PRIu64 "\n"
+ " proc_getname: %" PRIu64 "\n",
+ trace->stats.vfs_getname,
+ trace->stats.proc_getname);
+ }
+ }
perf_evlist__munmap(evlist);
out_close_evlist:
@@ -1753,38 +1811,33 @@ out_delete_evlist:
out:
trace->live = false;
return err;
+{
+ char errbuf[BUFSIZ];
+
out_error_tp:
- switch(errno) {
- case ENOENT:
- fputs("Error:\tUnable to find debugfs\n"
- "Hint:\tWas your kernel was compiled with debugfs support?\n"
- "Hint:\tIs the debugfs filesystem mounted?\n"
- "Hint:\tTry 'sudo mount -t debugfs nodev /sys/kernel/debug'\n",
- trace->output);
- break;
- case EACCES:
- fprintf(trace->output,
- "Error:\tNo permissions to read %s/tracing/events/raw_syscalls\n"
- "Hint:\tTry 'sudo mount -o remount,mode=755 %s'\n",
- debugfs_mountpoint, debugfs_mountpoint);
- break;
- default: {
- char bf[256];
- fprintf(trace->output, "Can't trace: %s\n",
- strerror_r(errno, bf, sizeof(bf)));
- }
- break;
- }
+ perf_evlist__strerror_tp(evlist, errno, errbuf, sizeof(errbuf));
+ goto out_error;
+
+out_error_open:
+ perf_evlist__strerror_open(evlist, errno, errbuf, sizeof(errbuf));
+
+out_error:
+ fprintf(trace->output, "%s\n", errbuf);
goto out_delete_evlist;
}
+}
static int trace__replay(struct trace *trace)
{
const struct perf_evsel_str_handler handlers[] = {
{ "raw_syscalls:sys_enter", trace__sys_enter, },
{ "raw_syscalls:sys_exit", trace__sys_exit, },
+ { "probe:vfs_getname", trace__vfs_getname, },
+ };
+ struct perf_data_file file = {
+ .path = input_name,
+ .mode = PERF_DATA_MODE_READ,
};
-
struct perf_session *session;
int err = -1;
@@ -1807,8 +1860,7 @@ static int trace__replay(struct trace *trace)
if (symbol__init() < 0)
return -1;
- session = perf_session__new(input_name, O_RDONLY, 0, false,
- &trace->tool);
+ session = perf_session__new(&file, false, &trace->tool);
if (session == NULL)
return -ENOMEM;
@@ -1992,7 +2044,10 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
NULL
};
struct trace trace = {
- .audit_machine = audit_detect_machine(),
+ .audit = {
+ .machine = audit_detect_machine(),
+ .open_id = audit_name_to_syscall("open", trace.audit.machine),
+ },
.syscalls = {
. max = -1,
},
@@ -2014,6 +2069,7 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
const struct option trace_options[] = {
OPT_BOOLEAN(0, "comm", &trace.show_comm,
"show the thread COMM next to its id"),
+ OPT_BOOLEAN(0, "tool_stats", &trace.show_tool_stats, "show tool stats"),
OPT_STRING('e', "expr", &ev_qualifier_str, "expr",
"list of events to trace"),
OPT_STRING('o', "output", &output_name, "file", "output file name"),
generated by cgit v1.2.3 (git 2.39.1) at 2025-08-06 15:16:58 +0000