Re: Can multiple BPF programs use same per-cpu perf ring buffer?


Yonghong Song
 

On Sun, Feb 16, 2020 at 8:43 PM Hayden Livingston
<halivingston@...> wrote:

Imagine I have a per-cpu perf ring buffer for all my cpus.

Now I have two eBPF programs.

In both these eBPF programs I do bpf_update_elem(myFD, &cpunumberkey,
&fdOfCPUspecificBuffer, BPF_ANY)

Will this mean that multiple eBPF programs will be able to write their
data into a single buffer (of course associated with cpu).

This would be amazing if it is truly possible. It seems like it should
be possible.
Yes, you can do this.


I have not tried yet.


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