Messages in this thread | | | Date | Wed, 21 Oct 2015 14:06:36 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH net-next 2/3] bpf: introduce bpf_perf_event_output() helper |
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On Tue, Oct 20, 2015 at 08:02:34PM -0700, Alexei Starovoitov wrote: > This helper is used to send raw data from eBPF program into > special PERF_TYPE_SOFTWARE/PERF_COUNT_SW_BPF_OUTPUT perf_event. > User space needs to perf_event_open() it (either for one or all cpus) and > store FD into perf_event_array (similar to bpf_perf_event_read() helper) > before eBPF program can send data into it. >
> diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h > index 2881145cda86..d3c417615361 100644 > --- a/include/uapi/linux/perf_event.h > +++ b/include/uapi/linux/perf_event.h > @@ -110,6 +110,7 @@ enum perf_sw_ids { > PERF_COUNT_SW_ALIGNMENT_FAULTS = 7, > PERF_COUNT_SW_EMULATION_FAULTS = 8, > PERF_COUNT_SW_DUMMY = 9, > + PERF_COUNT_SW_BPF_OUTPUT = 10, > > PERF_COUNT_SW_MAX, /* non-ABI */ > };
Do you really need the new type? Can't you use DUMMY for this?
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