2 files changed, 29 insertions, 1 deletions

diff --git a/tools/perf/Documentation/perf-report.txt b/tools/perf/Documentation/perf-report.txt
index 1e02c4e1a81f..a7d11ef2fe25 100644
--- a/tools/perf/Documentation/perf-report.txt
+++ b/tools/perf/Documentation/perf-report.txt
@@ -457,6 +457,10 @@ include::itrace.txt[]
         will be printed. Each entry is function name or file/line. Enabled by
         default, disable with --no-inline.
 
+--stats::
+        Display overall events statistics without any further processing.
+        (like the one at the end of the perf report -D command)
+
 include::callchain-overhead-calculation.txt[]
 
 SEE ALSO
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 770bf8a614f2..8e67a8c25ab1 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -62,6 +62,7 @@ struct report {
         bool                    show_threads;
         bool                    inverted_callchain;
         bool                    mem_mode;
+        bool                    stats_mode;
         bool                    header;
         bool                    header_only;
         bool                    nonany_branch_mode;
@@ -588,6 +589,20 @@ static void report__output_resort(struct report *rep)
         ui_progress__finish();
 }
 
+static void stats_setup(struct report *rep)
+{
+        memset(&rep->tool, 0, sizeof(rep->tool));
+        rep->tool.no_warn = true;
+}
+
+static int stats_print(struct report *rep)
+{
+        struct perf_session *session = rep->session;
+
+        perf_session__fprintf_nr_events(session, stdout);
+        return 0;
+}
+
 static int __cmd_report(struct report *rep)
 {
         int ret;
@@ -619,12 +634,18 @@ static int __cmd_report(struct report *rep)
                 return ret;
         }
 
+        if (rep->stats_mode)
+                stats_setup(rep);
+
         ret = perf_session__process_events(session);
         if (ret) {
                 ui__error("failed to process sample\n");
                 return ret;
         }
 
+        if (rep->stats_mode)
+                return stats_print(rep);
+
         report__warn_kptr_restrict(rep);
 
         evlist__for_each_entry(session->evlist, pos)
@@ -781,6 +802,7 @@ int cmd_report(int argc, const char **argv)
         OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any message"),
         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
                     "dump raw trace in ASCII"),
+        OPT_BOOLEAN(0, "stats", &report.stats_mode, "Display event stats"),
         OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
                    "file", "vmlinux pathname"),
         OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
@@ -1042,6 +1064,8 @@ repeat:
                 report.tool.show_feat_hdr = SHOW_FEAT_HEADER;
         if (report.show_full_info)
                 report.tool.show_feat_hdr = SHOW_FEAT_HEADER_FULL_INFO;
+        if (report.stats_mode)
+                use_browser = 0;
 
         if (strcmp(input_name, "-") != 0)
                 setup_browser(true);
@@ -1064,7 +1088,7 @@ repeat:
                         ret = 0;
                         goto error;
                 }
-        } else if (use_browser == 0 && !quiet) {
+        } else if (use_browser == 0 && !quiet && !report.stats_mode) {
                 fputs("# To display the perf.data header info, please use --header/--header-only options.\n#\n",
                       stdout);
         }