Messages in this thread | | | Subject | Re: [PATCH V5 1/1] bpf: control events stored in PERF_EVENT_ARRAY maps trace data output when perf sampling | From | Alexei Starovoitov <> | Date | Wed, 21 Oct 2015 20:09:19 -0700 |
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On 10/21/15 6:56 PM, Wangnan (F) wrote: >> One alternative solution I can image is to attach a BPF program >> at sampling like kprobe, and return 0 if we don't want sampling >> take action. Thought? > > Do you think attaching BPF programs to sampling is an acceptable idea?
If you mean to extend 'filter' concept to sampling events? So instead of soft_disable of non-local events, you'll attach bpf program to sampling events and use map lookup to decide whether to filter out or not such sampling event? What pt_regs would be in such case?
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