[PATCH 21/21] perf report: Add --stats=ud option to display user data debug info

Jiri Olsa
2018-01-24T11:52:39Z

Adding --stats=ud option to display user data
debug info, like:

$ perf report --no-children --tasks=ud
# sample event match drop pid tid ppid comm
0 0 0 0 0 0 -1 |swapper
503 437 503 0 23985 23985 -1 |sched-messaging
594 520 594 0 24064 24064 23985 | sched-messaging
624 345 622 2 24320 24320 23985 | sched-messaging
567 514 566 1 24065 24065 23985 | sched-messaging
470 298 467 3 24321 24321 23985 | sched-messaging
388 266 387 1 24066 24066 23985 | sched-messaging
...

The --tasks output is useful for displaying thread
related stats. More stats can be added by adding
new argument to --stats=<arg> option.

Link: http://lkml.kernel.org/n/tip-3wcrngoibk5l96nqyhp0nbkm@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/perf/builtin-report.c | 51 +++++++++++++++++++++++++++++++++++++++------
1 file changed, 45 insertions(+), 6 deletions(-)

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 82b2368d208a..2cd00055d517 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -54,6 +54,11 @@
#include <unistd.h>
#include <linux/mman.h>

+enum {
+ TASKS_STAT__USER_NONE = 0,
+ TASKS_STAT__USER_DATA,
+};
+
struct report {
struct perf_tool tool;
struct perf_session *session;
@@ -83,6 +88,7 @@ struct report {
int socket_filter;
DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
struct branch_type_stat brtype_stat;
+ int tasks_stat;
};

static int report__config(const char *var, const char *value, void *cb)
@@ -839,6 +845,11 @@ static void tasks_setup(struct report *rep)
rep->tool.exit = perf_event__process_exit;
rep->tool.fork = perf_event__process_fork;
rep->tool.no_warn = true;
+
+ if (rep->tasks_stat == TASKS_STAT__USER_DATA) {
+ rep->tool.sample = process_sample_event;
+ rep->tool.user_data = process_user_data_event;
+ }
}

struct task {
@@ -898,11 +909,24 @@ static int map_groups__fprintf_task(struct map_groups *mg, int indent, FILE *fp)
return printed;
}

-static void task__print_level(struct task *task, FILE *fp, int level)
+static void task__print_level(struct task *task, FILE *fp, int level,
+ struct report *rep)
{
struct thread *thread = task->thread;
struct task *child;
- int comm_indent = fprintf(fp, " %8d %8d %8d |%*s",
+ int comm_indent;
+
+ comm_indent = fprintf(fp, " ");
+
+ if (rep->tasks_stat == TASKS_STAT__USER_DATA) {
+ comm_indent += fprintf(fp, "%8" PRIu64 " %8" PRIu64 " %8" PRIu64 " %8" PRIu64,
+ thread->stats.user_data_sample,
+ thread->stats.user_data_event,
+ thread->stats.user_data_match,
+ thread->stats.user_data_drop);
+ }
+
+ comm_indent += fprintf(fp, "%8d %8d %8d |%*s",
thread->pid_, thread->tid, thread->ppid,
level, "");

@@ -912,7 +936,7 @@ static void task__print_level(struct task *task, FILE *fp, int level)

if (!list_empty(&task->children)) {
list_for_each_entry(child, &task->children, list)
- task__print_level(child, fp, level + 1);
+ task__print_level(child, fp, level + 1, rep);
}
}

@@ -973,10 +997,15 @@ static int tasks_print(struct report *rep, FILE *fp)
list_add_tail(&task->list, &list);
}

- fprintf(fp, "# %8s %8s %8s %s\n", "pid", "tid", "ppid", "comm");
+ fprintf(fp, "#");
+
+ if (rep->tasks_stat == TASKS_STAT__USER_DATA)
+ fprintf(fp, "%8s %8s %8s %8s", "sample", "event", "match", "drop");
+
+ fprintf(fp, "%8s %8s %8s %s\n", "pid", "tid", "ppid", "comm");

list_for_each_entry(task, &list, list)
- task__print_level(task, fp, 0);
+ task__print_level(task, fp, 0, rep);

free(tasks);
return 0;
@@ -1154,6 +1183,7 @@ int cmd_report(int argc, const char **argv)
"perf report [<options>]",
NULL
};
+ const char *tasks_stat;
struct report report = {
.tool = {
.sample = process_sample_event,
@@ -1189,7 +1219,8 @@ int cmd_report(int argc, const char **argv)
OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
"dump raw trace in ASCII"),
OPT_BOOLEAN(0, "stats", &report.stats_mode, "Display event stats"),
- OPT_BOOLEAN(0, "tasks", &report.tasks_mode, "Display recorded tasks"),
+ OPT_STRING_OPTARG_SET(0, "tasks", &tasks_stat, &report.tasks_mode,
+ "ud", "Display recorded tasks", "(none)"),
OPT_BOOLEAN(0, "mmaps", &report.mmaps_mode, "Display recorded tasks memory maps"),
OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
"file", "vmlinux pathname"),
@@ -1341,6 +1372,14 @@ int cmd_report(int argc, const char **argv)
if (report.mmaps_mode)
report.tasks_mode = true;

+ if (report.tasks_mode) {
+ if (!strcmp(tasks_stat, "ud")) {
+ report.tasks_stat = TASKS_STAT__USER_DATA;
+ /* force --no-children */
+ symbol_conf.cumulate_callchain = false;
+ }
+ }
+
if (quiet)
perf_quiet_option();

--
2.13.6