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55c33dfbeb
I opened /sys/kernel/tracing/trace once and kept reading from it. bpf_trace_printk somehow did not seem to work, no entries were appended to that trace file. It turns out that tracing is disabled when that file is open. Save the next person some time and document this. The trace file is described in Documentation/trace/ftrace.rst, however the implication "tracing is disabled" did not immediate translate to "bpf_trace_printk silently discards entries". Signed-off-by: Peter Wu <peter@lekensteyn.nl> Signed-off-by: Alexei Starovoitov <ast@kernel.org> |
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