linux-kernel - [PATCH v7 08/10] perf script: Display off-cpu samples correctly

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Message-ID: <20241108204137.2444151-9-howardchu95@gmail.com>
Date: Fri,  8 Nov 2024 12:41:35 -0800
From: Howard Chu <howardchu95@...il.com>
To: acme@...nel.org,
	peterz@...radead.org
Cc: namhyung@...nel.org,
	irogers@...gle.com,
	mingo@...hat.com,
	mark.rutland@....com,
	james.clark@...aro.org,
	alexander.shishkin@...ux.intel.com,
	jolsa@...nel.org,
	adrian.hunter@...el.com,
	kan.liang@...ux.intel.com,
	linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Howard Chu <howardchu95@...il.com>
Subject: [PATCH v7 08/10] perf script: Display off-cpu samples correctly

No PERF_SAMPLE_CALLCHAIN in sample_type, but I need perf script to
display a callchain, have to specify manually.

Also, prefer displaying a callchain:

 gvfs-afc-volume    2267 [001] 3829232.955656: 1001115340 offcpu-time:
            77f05292603f __pselect+0xbf (/usr/lib/x86_64-linux-gnu/libc.so.6)
            77f052a1801c [unknown] (/usr/lib/x86_64-linux-gnu/libusbmuxd-2.0.so.6.0.0)
            77f052a18d45 [unknown] (/usr/lib/x86_64-linux-gnu/libusbmuxd-2.0.so.6.0.0)
            77f05289ca94 start_thread+0x384 (/usr/lib/x86_64-linux-gnu/libc.so.6)
            77f052929c3c clone3+0x2c (/usr/lib/x86_64-linux-gnu/libc.so.6)

to a raw binary BPF output:

BPF output: 0000: dd 08 00 00 db 08 00 00  <DD>...<DB>...
	  0008: cc ce ab 3b 00 00 00 00  <CC>Ϋ;....
	  0010: 06 00 00 00 00 00 00 00  ........
	  0018: 00 fe ff ff ff ff ff ff  .<FE><FF><FF><FF><FF><FF><FF>
	  0020: 3f 60 92 52 f0 77 00 00  ?`.R<F0>w..
	  0028: 1c 80 a1 52 f0 77 00 00  ..<A1>R<F0>w..
	  0030: 45 8d a1 52 f0 77 00 00  E.<A1>R<F0>w..
	  0038: 94 ca 89 52 f0 77 00 00  .<CA>.R<F0>w..
	  0040: 3c 9c 92 52 f0 77 00 00  <..R<F0>w..
	  0048: 00 00 00 00 00 00 00 00  ........
	  0050: 00 00 00 00              ....

Signed-off-by: Howard Chu <howardchu95@...il.com>
---
 tools/perf/builtin-script.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index 6b6d4472db6e..1893d2117aab 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -662,7 +662,7 @@ static int perf_session__check_output_opt(struct perf_session *session)
 
 		evlist__for_each_entry(session->evlist, evsel) {
 			not_pipe = true;
-			if (evsel__has_callchain(evsel)) {
+			if (evsel__has_callchain(evsel) || evsel__is_offcpu_event(evsel)) {
 				use_callchain = true;
 				break;
 			}
@@ -2353,7 +2353,7 @@ static void process_event(struct perf_script *script,
 	else if (PRINT_FIELD(BRSTACKOFF))
 		perf_sample__fprintf_brstackoff(sample, thread, attr, fp);
 
-	if (evsel__is_bpf_output(evsel) && PRINT_FIELD(BPF_OUTPUT))
+	if (evsel__is_bpf_output(evsel) && !evsel__is_offcpu_event(evsel) && PRINT_FIELD(BPF_OUTPUT))
 		perf_sample__fprintf_bpf_output(sample, fp);
 	perf_sample__fprintf_insn(sample, evsel, attr, thread, machine, fp, al);
 
-- 
2.43.0