On 7/13/15 6:59 PM, He Kuang wrote:
There're scenarios that we need an eBPF program to record not only kprobe point args, but also the PMU counters, time latencies or the number of cache misses between two probe points and other information when the probe point is entered.This patch adds a new trace event to establish infrastruction for bpf to output data to perf. Userspace perf tools can detect and use this event as using the existing tracepoint events. New bpf trace event entry in debugfs: /sys/kernel/debug/tracing/events/bpf/bpf_output_data Userspace perf tools detect the new tracepoint event as: bpf:bpf_output_data [Tracepoint event] Data in ring-buffer of perf events added to this event will be polled out, sample types and other attributes can be adjusted to those events directly without touching the original kprobe events. The bpf helper function gives eBPF program ability to output data as perf sample event. This helper simple call the new trace event and userspace perf tools can record the BPF ftrace event to collect those records. Signed-off-by: He Kuang<[email protected]>
Looks good to me. Acked-by: Alexei Starovoitov <[email protected]> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
