linux-kernel - [PATCH v4 1/9] perf evsel: Set BPF output to system-wide

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Message-ID: <20240807153843.3231451-2-howardchu95@gmail.com>
Date: Wed,  7 Aug 2024 23:38:35 +0800
From: Howard Chu <howardchu95@...il.com>
To: namhyung@...nel.org
Cc: irogers@...gle.com,
	acme@...nel.org,
	adrian.hunter@...el.com,
	jolsa@...nel.org,
	kan.liang@...ux.intel.com,
	linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v4 1/9] perf evsel: Set BPF output to system-wide

pid = -1 for bpf-output event.

This makes perf record -p <PID> --off-cpu work. Otherwise bpf-output
cannot be collected.

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

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index bc603193c477..b961467133cf 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -2282,6 +2282,10 @@ static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus,
 
 			test_attr__ready();
 
+			/* BPF output event can only be system-wide */
+			if (evsel__is_bpf_output(evsel))
+				pid = -1;
+
 			/* Debug message used by test scripts */
 			pr_debug2_peo("sys_perf_event_open: pid %d  cpu %d  group_fd %d  flags %#lx",
 				pid, perf_cpu_map__cpu(cpus, idx).cpu, group_fd, evsel->open_flags);
-- 
2.45.2