linux-kernel - [PATCH 3/5] perf inject: Fix output from a pipe to a file

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Date:   Mon, 19 Jul 2021 15:31:51 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>
Subject: [PATCH 3/5] perf inject: Fix output from a pipe to a file

Sometimes it needs to save the perf inject data to a file for
debugging.  But normally it assumes the same format for input and
output, so the end result cannot be used due to a broken format.

  # perf record -a -o - sleep 1 | perf inject -b -o my.data

  # perf report -i my.data --stdio
  0x208 [0]: failed to process type: 0 [Invalid argument]
  Error:
  failed to process sample
  # To display the perf.data header info, please use --header/--header-only options.
  #

In this case, it thought the data has a regular file header since the
output is not a pipe.  But actually it doesn't have one and has a pipe
file header.  At the end of the session, it tries to rewrite the
regular file header with updated features and it overwrites the data
just follows the pipe header.

Fix it by checking either the input and the output is a pipe.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/builtin-inject.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c
index d99f4538d2fc..7c126597d3f5 100644
--- a/tools/perf/builtin-inject.c
+++ b/tools/perf/builtin-inject.c
@@ -46,6 +46,7 @@ struct perf_inject {
 	bool			jit_mode;
 	bool			in_place_update;
 	bool			in_place_update_dry_run;
+	bool			is_pipe;
 	const char		*input_name;
 	struct perf_data	output;
 	u64			bytes_written;
@@ -126,7 +127,7 @@ static int perf_event__repipe_attr(struct perf_tool *tool,
 	if (ret)
 		return ret;
 
-	if (!inject->output.is_pipe)
+	if (!inject->is_pipe)
 		return 0;
 
 	return perf_event__repipe_synth(tool, event);
@@ -825,14 +826,14 @@ static int __cmd_inject(struct perf_inject *inject)
 	if (!inject->itrace_synth_opts.set)
 		auxtrace_index__free(&session->auxtrace_index);
 
-	if (!data_out->is_pipe && !inject->in_place_update)
+	if (!inject->is_pipe && !inject->in_place_update)
 		lseek(fd, output_data_offset, SEEK_SET);
 
 	ret = perf_session__process_events(session);
 	if (ret)
 		return ret;
 
-	if (!data_out->is_pipe && !inject->in_place_update) {
+	if (!inject->is_pipe && !inject->in_place_update) {
 		if (inject->build_ids)
 			perf_header__set_feat(&session->header,
 					      HEADER_BUILD_ID);
@@ -991,7 +992,10 @@ int cmd_inject(int argc, const char **argv)
 	}
 
 	data.path = inject.input_name;
-	inject.session = __perf_session__new(&data, inject.output.is_pipe,
+	if (!strcmp(inject.input_name, "-") || inject.output.is_pipe)
+		inject.is_pipe = true;
+
+	inject.session = __perf_session__new(&data, inject.is_pipe,
 					     perf_data__fd(&inject.output),
 					     &inject.tool);
 	if (IS_ERR(inject.session))
-- 
2.32.0.402.g57bb445576-goog