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perf report: Add --stats option to display quick data statistics

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Add --stats option to display quick data statistics of event numbers,
without any further processing, like the one at the end of the perf
report -D command.

  $ perf report --stat

  Aggregated stats:
             TOTAL events:       4566
              MMAP events:        113
              LOST events:         19
              COMM events:          3
              FORK events:        400
            SAMPLE events:       3315
             MMAP2 events:         32
    FINISHED_ROUND events:        681
        THREAD_MAP events:          1
           CPU_MAP events:          1
         TIME_CONV events:          1

I found this useful when hunting lost events for another change.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20180107160356.28203-12-jolsa@kernel.org
[ Rename it to --stats, plural ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2018-01-07 17:03:55 +01:00 committed by Arnaldo Carvalho de Melo
parent 075ca1ebb2
commit a4a4d0a7a2
2 changed files with 29 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
tools/perf/Documentation/perf-report.txt
View file

@ -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

26
tools/perf/builtin-report.c
View file

@ -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 @@ int cmd_report(int argc, const char **argv)
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 @@ int cmd_report(int argc, const char **argv)
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);
}