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Subject[PATCH net-next 0/4] bpf: bpf_htab: Add BPF_MAP_TYPE_PERCPU_HASH
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This patchset adds BPF_MAP_TYPE_PERCPU_HASH map type which allows
percpu value.

BPF + kprobe is very useful in statistics collection. In particular,
bpf is strong in doing aggregation within the kernel instead of
outputting a lot of raw samples to the userspace.

In some cases, bumping a counter/value of a particular key will have
noticeable impact. For example, doing statistics collection
on received packets and aggregating them by network
prefix (like /64 in IPv6). Having a percpu value can help.

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