netdev - [PATCH net-next 0/4] bpf: bpf_htab: Add BPF_MAP_TYPE_PERCPU

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Date:	Thu, 7 Jan 2016 14:35:51 -0800
From:	Martin KaFai Lau <kafai@...com>
To:	<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:	FB Kernel Team <kernel-team@...com>,
	Alexei Starovoitov <alexei.starovoitov@...il.com>
Subject: [PATCH net-next 0/4] bpf: bpf_htab: Add BPF_MAP_TYPE_PERCPU_HASH

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.