Commit 39f4a913 authored Feb 04, 2019 by Song Liu Committed by Arnaldo Carvalho de Melo Feb 14, 2019

perf utils: Silence "Couldn't synthesize bpf events" warning for EPERM



Synthesizing BPF events is only supported for root. Silent warning msg
when non-root user runs perf-record.

Reported-by: David Carrillo-Cisneros <davidca@fb.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
Tested-by: David Carrillo-Cisneros <davidca@fb.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: kernel-team@fb.com
Link: http://lkml.kernel.org/r/20190204193140.719740-1-songliubraving@fb.com


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

parent 33937e59

tools/perf/util/bpf-event.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -236,8 +236,8 @@ int perf_event__synthesize_bpf_events(struct perf_tool *tool,
		pr_debug("%s: can't get next program: %s%s",
		__func__, strerror(errno),
		errno == EINVAL ? " -- kernel too old?" : "");
		/* don't report error on old kernel */
		err = (errno == EINVAL) ? 0 : -1;
		/* don't report error on old kernel or EPERM */
		err = (errno == EINVAL \|\| errno == EPERM) ? 0 : -1;
		break;
		}
		fd = bpf_prog_get_fd_by_id(id);

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