perf stat report: Add report command

Adding 'perf stat report' command support. ATM it only processes attr
events and display nothing.

Reported-by: Kan Liang <kan.liang@intel.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1446734469-11352-12-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 69 insertions, 4 deletions

diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt
index 70eee1c2c444..95f492828657 100644
--- a/tools/perf/Documentation/perf-stat.txt
+++ b/tools/perf/Documentation/perf-stat.txt
@@ -11,6 +11,7 @@ SYNOPSIS
 'perf stat' [-e <EVENT> | --event=EVENT] [-a] <command>
 'perf stat' [-e <EVENT> | --event=EVENT] [-a] -- <command> [<options>]
 'perf stat' [-e <EVENT> | --event=EVENT] [-a] record [-o file] -- <command> [<options>]
+'perf stat' report [-i file]
 
 DESCRIPTION
 -----------
@@ -26,6 +27,9 @@ OPTIONS
 record::
         See STAT RECORD.
 
+report::
+        See STAT REPORT.
+
 -e::
 --event=::
         Select the PMU event. Selection can be:
@@ -170,6 +174,14 @@ Stores stat data into perf data file.
 --output file::
 Output file name.
 
+STAT REPORT
+-----------
+Reads and reports stat data from perf data file.
+
+-i file::
+--input file::
+Input file name.
+
 
 EXAMPLES
 --------
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 575e2535ea03..abba49b847d2 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -60,6 +60,8 @@
 #include "util/thread_map.h"
 #include "util/counts.h"
 #include "util/session.h"
+#include "util/tool.h"
+#include "asm/bug.h"
 
 #include <stdlib.h>
 #include <sys/prctl.h>
@@ -132,6 +134,7 @@ struct perf_stat {
         struct perf_data_file    file;
         struct perf_session     *session;
         u64                      bytes_written;
+        struct perf_tool         tool;
 };
 
 static struct perf_stat         perf_stat;
@@ -1041,8 +1044,8 @@ static void print_header(int argc, const char **argv)
                 else if (target.cpu_list)
                         fprintf(output, "\'CPU(s) %s", target.cpu_list);
                 else if (!target__has_task(&target)) {
-                        fprintf(output, "\'%s", argv[0]);
-                        for (i = 1; i < argc; i++)
+                        fprintf(output, "\'%s", argv ? argv[0] : "pipe");
+                        for (i = 1; argv && (i < argc); i++)
                                 fprintf(output, " %s", argv[i]);
                 } else if (target.pid)
                         fprintf(output, "process id \'%s", target.pid);
@@ -1527,6 +1530,55 @@ static int __cmd_record(int argc, const char **argv)
         return argc;
 }
 
+static const char * const report_usage[] = {
+        "perf stat report [<options>]",
+        NULL,
+};
+
+static struct perf_stat perf_stat = {
+        .tool = {
+                .attr           = perf_event__process_attr,
+        },
+};
+
+static int __cmd_report(int argc, const char **argv)
+{
+        struct perf_session *session;
+        const struct option options[] = {
+        OPT_STRING('i', "input", &input_name, "file", "input file name"),
+        OPT_END()
+        };
+        struct stat st;
+        int ret;
+
+        argc = parse_options(argc, argv, options, report_usage, 0);
+
+        if (!input_name || !strlen(input_name)) {
+                if (!fstat(STDIN_FILENO, &st) && S_ISFIFO(st.st_mode))
+                        input_name = "-";
+                else
+                        input_name = "perf.data";
+        }
+
+        perf_stat.file.path = input_name;
+        perf_stat.file.mode = PERF_DATA_MODE_READ;
+
+        session = perf_session__new(&perf_stat.file, false, &perf_stat.tool);
+        if (session == NULL)
+                return -1;
+
+        perf_stat.session  = session;
+        stat_config.output = stderr;
+        evsel_list         = session->evlist;
+
+        ret = perf_session__process_events(session);
+        if (ret)
+                return ret;
+
+        perf_session__delete(session);
+        return 0;
+}
+
 int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
 {
         const char * const stat_usage[] = {
@@ -1537,7 +1589,7 @@ int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
         const char *mode;
         FILE *output = stderr;
         unsigned int interval;
-        const char * const stat_subcommands[] = { "record" };
+        const char * const stat_subcommands[] = { "record", "report" };
 
         setlocale(LC_ALL, "");
 
@@ -1553,7 +1605,8 @@ int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
                 argc = __cmd_record(argc, argv);
                 if (argc < 0)
                         return -1;
-        }
+        } else if (argc && !strncmp(argv[0], "rep", 3))
+                return __cmd_report(argc, argv);
 
         interval = stat_config.interval;