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From: Song Liu <songliubraving@fb.com>
To: <netdev@vger.kernel.org>, <bpf@vger.kernel.org>
Cc: <kernel-team@fb.com>, <ast@kernel.org>, <daniel@iogearbox.net>,
	Song Liu <songliubraving@fb.com>, Yonghong Song <yhs@fb.com>
Subject: [PATCH bpf-next] bpf: allow bpf_perf_event_read_value in all BPF programs
Date: Fri, 14 Feb 2020 15:41:46 -0800
Message-ID: <20200214234146.2910011-1-songliubraving@fb.com> (raw)

bpf_perf_event_read_value() is NMI safe. Enable it for all BPF programs.
This can be used in fentry/fexit to profile BPF program and individual
kernel function with hardware counters.

Cc: Yonghong Song <yhs@fb.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
 kernel/trace/bpf_trace.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 19e793aa441a..4ddd5ac46094 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -843,6 +843,8 @@ tracing_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 		return &bpf_send_signal_proto;
 	case BPF_FUNC_send_signal_thread:
 		return &bpf_send_signal_thread_proto;
+	case BPF_FUNC_perf_event_read_value:
+		return &bpf_perf_event_read_value_proto;
 		return NULL;
@@ -858,8 +860,6 @@ kprobe_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 		return &bpf_get_stackid_proto;
 	case BPF_FUNC_get_stack:
 		return &bpf_get_stack_proto;
-	case BPF_FUNC_perf_event_read_value:
-		return &bpf_perf_event_read_value_proto;
 	case BPF_FUNC_override_return:
 		return &bpf_override_return_proto;

             reply index

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-14 23:41 Song Liu [this message]
2020-02-18 15:09 ` Daniel Borkmann

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