Messages in this thread | | | From | Song Liu <> | Subject | Re: [PATCH perf,bpf 5/5] perf util: generate bpf_prog_info_event for short living bpf programs | Date | Wed, 21 Nov 2018 22:35:35 +0000 |
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> On Nov 21, 2018, at 2:11 PM, Alexei Starovoitov <alexei.starovoitov@gmail.com> wrote: > > On Wed, Nov 21, 2018 at 11:55:02AM -0800, Song Liu wrote: >> This patch enables perf-record to listen to bpf_event and generate >> bpf_prog_info_event for bpf programs loaded and unloaded during >> perf-record run. >> >> To minimize latency between bpf_event and following bpf calls, separate >> mmap with watermark of 1 is created to process these vip events. Then >> a separate dummy event is attached to the special mmap. A separate thread >> is used to only poll bpf events. >> >> By default, perf-record will listen to bpf_event. Option no-bpf-event is >> added in case the user would opt out. > > I think only default perf-record for sampling should include it. > perf record -e for tracepoints, kprobes and anything else should imply no-bpf-event. >
Maybe something like
if (software_event && ! -g) no_bpf_event = true;
?
This will allow attaching kprobe on bpf helper and see which bpf program calls it.
Thanks, Song
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