FAILED: patch "[PATCH] perf report: Fix --task and --stat with pipe input" failed to apply to 5.4-stable tree

The patch below does not apply to the 5.4-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 892ba7f18621a02af4428c58d97451f64685dba4 Mon Sep 17 00:00:00 2001
From: Namhyung Kim <[email protected]>
Date: Tue, 29 Jun 2021 21:30:58 -0700
Subject: [PATCH] perf report: Fix --task and --stat with pipe input

Current 'perf report' fails to process a pipe input when --task or --stat options are used. This is because they reset all the tool callbacks and fails to find a matching event for a sample.

When pipe input is used, the event info is passed via ATTR records so it needs to handle that operation. Otherwise the following error occurs. Note, -14 (= -EFAULT) comes from evlist__parse_sample():

  # perf record -a -o- sleep 1 | perf report -i- --stat
  Can't parse sample, err = -14
  0x271044 [0x38]: failed to process type: 9
  Error:
  failed to process sample
  #

Committer testing:

Before:

  $ perf record -o- sleep 1 | perf report -i- --stat
  Can't parse sample, err = -14
  [ perf record: Woken up 1 times to write data ]
  0x1350 [0x30]: failed to process type: 9
  Error:
  failed to process sample
  [ perf record: Captured and wrote 0.000 MB - ]
  $

After:

  $ perf record -o- sleep 1 | perf report -i- --stat
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.000 MB - ]

Aggregated stats:
TOTAL events: 41
COMM events: 2 ( 4.9%)
EXIT events: 1 ( 2.4%)
SAMPLE events: 9 (22.0%)
MMAP2 events: 4 ( 9.8%)
ATTR events: 1 ( 2.4%)
FINISHED_ROUND events: 1 ( 2.4%)
THREAD_MAP events: 1 ( 2.4%)
CPU_MAP events: 1 ( 2.4%)
EVENT_UPDATE events: 1 ( 2.4%)
TIME_CONV events: 1 ( 2.4%)
FEATURE events: 19 (46.3%)
cycles:uhH stats:
SAMPLE events: 9
$

index bc5c393021dc..8639bbe0969d 100644
@@ -729,9 +729,14 @@ static int count_sample_event(struct perf_tool *tool __maybe_unused,
 	return 0;
 }
 
+static int process_attr(struct perf_tool *tool __maybe_unused,
+			union perf_event *event,
+			struct evlist **pevlist);
+
 static void stats_setup(struct report *rep)
 {
 	memset(&rep->tool, 0, sizeof(rep->tool));
+	rep->tool.attr = process_attr;
 	rep->tool.sample = count_sample_event;
 	rep->tool.no_warn = true;
 }

@@ -753,6 +758,7 @@ static void tasks_setup(struct report *rep)
 		rep->tool.mmap = perf_event__process_mmap;
 		rep->tool.mmap2 = perf_event__process_mmap2;
 	}
+	rep->tool.attr = process_attr;
 	rep->tool.comm = perf_event__process_comm;
 	rep->tool.exit = perf_event__process_exit;
 	rep->tool.fork = perf_event__process_fork;