From 03de8656c7778c5434cc2ca8e6b4699c1176c090 Mon Sep 17 00:00:00 2001
From: Namhyung Kim <namhyung@kernel.org>
Date: Thu, 10 Dec 2020 15:13:01 +0900
Subject: [PATCH] perf report: Support --header-only for pipe mode

The --header-only checks file header and prints the feature data.  But
as pipe mode doesn't have it in the header it prints almost nothing.
Change it to process first few records until it founds HEADER_FEATURE.

Before:
  $ perf record -o- true | perf report -i- --header-only
  # ========
  # captured on    : Thu Dec 10 14:34:59 2020
  # header version : 1
  # data offset    : 0
  # data size      : 0
  # feat offset    : 0
  # ========
  #

After:
  $ perf record -o- true | perf report -i- --header-only
  # ========
  # captured on    : Thu Dec 10 14:49:11 2020
  # header version : 1
  # data offset    : 0
  # data size      : 0
  # feat offset    : 0
  # ========
  #
  # hostname : balhae
  # os release : 5.7.17-1xxx
  # perf version : 5.10.rc6.gdb0ea13cc741
  # arch : x86_64
  # nrcpus online : 8
  # nrcpus avail : 8
  # cpudesc : Intel(R) Core(TM) i7-8665U CPU @ 1.90GHz
  # cpuid : GenuineIntel,6,142,12
  # total memory : 16158916 kB
  # cmdline : perf record -o- true
  # event : name = cycles, , id = { 81, 82, 83, 84, 85, 86, 87, 88 }, size = 120, ...
  # CPU_TOPOLOGY info available, use -I to display
  # NUMA_TOPOLOGY info available, use -I to display
  # pmu mappings: intel_pt = 9, intel_bts = 8, software = 1, power = 20, uprobe = 7, ...
  # time of first sample : 0.000000
  # time of last sample : 0.000000
  # sample duration :      0.000 ms
  # MEM_TOPOLOGY info available, use -I to display
  # cpu pmu capabilities: branches=32, max_precise=3, pmu_name=skylake

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: https://lore.kernel.org/r/20201210061302.88213-1-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/builtin-report.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 5efbd0602f17..2a845d6cac09 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -226,6 +226,8 @@ static int process_feature_event(struct perf_session *session,
 		pr_err("failed: wrong feature ID: %" PRI_lu64 "\n",
 		       event->feat.feat_id);
 		return -1;
+	} else if (rep->header_only) {
+		session_done = 1;
 	}
 
 	/*
@@ -1512,6 +1514,13 @@ repeat:
 		perf_session__fprintf_info(session, stdout,
 					   report.show_full_info);
 		if (report.header_only) {
+			if (data.is_pipe) {
+				/*
+				 * we need to process first few records
+				 * which contains PERF_RECORD_HEADER_FEATURE.
+				 */
+				perf_session__process_events(session);
+			}
 			ret = 0;
 			goto error;
 		}