Messages in this thread | | | From | Martin KaFai Lau <> | Subject | [PATCH net-next 0/4] bpf: bpf_htab: Add BPF_MAP_TYPE_PERCPU_HASH | Date | Thu, 7 Jan 2016 14:35:51 -0800 |
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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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