perf evlist: Show event attribute details

There was no easy way to see the frequency used, and with the change of
default, we better provide one.

[root@sandy linux]# perf evlist -F
cycles: sample_freq=4000
[root@sandy linux]# perf evlist -v
cycles: sample_freq=4000, size: 80, sample_type: 391, read_format: 7, disabled: 1, inherit: 1, mmap: 1, comm: 1, freq: 1, sample_id_all: 1, exclude_guest: 1
[root@sandy linux]#

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.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-e1p9poez3nwrgycbmwqmhlsu@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 100 insertions, 11 deletions

diff --git a/tools/perf/Documentation/perf-evlist.txt b/tools/perf/Documentation/perf-evlist.txt
index 0507ec7bad71..15217345c2fa 100644
--- a/tools/perf/Documentation/perf-evlist.txt
+++ b/tools/perf/Documentation/perf-evlist.txt
@@ -20,6 +20,14 @@ OPTIONS
 --input=::
         Input file name. (default: perf.data unless stdin is a fifo)
 
+-F::
+--freq=::
+        Show just the sample frequency used for each event.
+
+-v::
+--verbose=::
+        Show all fields.
+
 SEE ALSO
 --------
 linkperf:perf-record[1], linkperf:perf-list[1],
diff --git a/tools/perf/builtin-evlist.c b/tools/perf/builtin-evlist.c
index 26760322c4f4..e52d77ec7084 100644
--- a/tools/perf/builtin-evlist.c
+++ b/tools/perf/builtin-evlist.c
@@ -15,9 +15,40 @@
 #include "util/parse-options.h"
 #include "util/session.h"
 
-static const char *input_name;
+struct perf_attr_details {
+        bool freq;
+        bool verbose;
+};
+
+static int comma_printf(bool *first, const char *fmt, ...)
+{
+        va_list args;
+        int ret = 0;
+
+        if (!*first) {
+                ret += printf(",");
+        } else {
+                ret += printf(":");
+                *first = false;
+        }
+
+        va_start(args, fmt);
+        ret += vprintf(fmt, args);
+        va_end(args);
+        return ret;
+}
+
+static int __if_print(bool *first, const char *field, u64 value)
+{
+        if (value == 0)
+                return 0;
+
+        return comma_printf(first, " %s: %" PRIu64, field, value);
+}
+
+#define if_print(field) __if_print(&first, #field, pos->attr.field)
 
-static int __cmd_evlist(void)
+static int __cmd_evlist(const char *input_name, struct perf_attr_details *details)
 {
         struct perf_session *session;
         struct perf_evsel *pos;
@@ -26,8 +57,52 @@ static int __cmd_evlist(void)
         if (session == NULL)
                 return -ENOMEM;
 
-        list_for_each_entry(pos, &session->evlist->entries, node)
-                printf("%s\n", event_name(pos));
+        list_for_each_entry(pos, &session->evlist->entries, node) {
+                bool first = true;
+
+                printf("%s", event_name(pos));
+
+                if (details->verbose || details->freq) {
+                        comma_printf(&first, " sample_freq=%" PRIu64,
+                                     (u64)pos->attr.sample_freq);
+                }
+
+                if (details->verbose) {
+                        if_print(type);
+                        if_print(config);
+                        if_print(config1);
+                        if_print(config2);
+                        if_print(size);
+                        if_print(sample_type);
+                        if_print(read_format);
+                        if_print(disabled);
+                        if_print(inherit);
+                        if_print(pinned);
+                        if_print(exclusive);
+                        if_print(exclude_user);
+                        if_print(exclude_kernel);
+                        if_print(exclude_hv);
+                        if_print(exclude_idle);
+                        if_print(mmap);
+                        if_print(comm);
+                        if_print(freq);
+                        if_print(inherit_stat);
+                        if_print(enable_on_exec);
+                        if_print(task);
+                        if_print(watermark);
+                        if_print(precise_ip);
+                        if_print(mmap_data);
+                        if_print(sample_id_all);
+                        if_print(exclude_host);
+                        if_print(exclude_guest);
+                        if_print(__reserved_1);
+                        if_print(wakeup_events);
+                        if_print(bp_type);
+                        if_print(branch_sample_type);
+                }
+
+                putchar('\n');
+        }
 
         perf_session__delete(session);
         return 0;
@@ -38,17 +113,23 @@ static const char * const evlist_usage[] = {
         NULL
 };
 
-static const struct option options[] = {
-        OPT_STRING('i', "input", &input_name, "file",
-                    "input file name"),
-        OPT_END()
-};
-
 int cmd_evlist(int argc, const char **argv, const char *prefix __used)
 {
+        struct perf_attr_details details = { .verbose = false, };
+        const char *input_name;
+        const struct option options[] = {
+                OPT_STRING('i', "input", &input_name, "file",
+                            "Input file name"),
+                OPT_BOOLEAN('F', "freq", &details.freq,
+                            "Show the sample frequency"),
+                OPT_BOOLEAN('v', "verbose", &details.verbose,
+                            "Show all event attr details"),
+                OPT_END()
+        };
+
         argc = parse_options(argc, argv, options, evlist_usage, 0);
         if (argc)
                 usage_with_options(evlist_usage, options);
 
-        return __cmd_evlist();
+        return __cmd_evlist(input_name, &details);
 }