Re: [PATCH V5 1/1] bpf: control events stored in PERF_EVENT_ARRAY maps trace data output when perf sampling

On Wed, Oct 21, 2015 at 09:42:12PM +0800, Wangnan (F) wrote:

How can an eBPF program access a !local event:

when creating perf event array we don't care which perf event
is for which CPU, so perf program can access any perf event in
that array.

So what is stopping the eBPF thing from calling perf_event_read_local()
on a !local event and triggering a kernel splat?