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[PATCH v2 net-next 0/4] bpf: bpf_htab: Add BPF_MAP_TYPE_PERCPU_HASH

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  [PATCH v2 net-next 0/4] bpf: bpf_htab: Add BPF_MAP_TYPE_PERCPU_HASH Martin KaFai Lau <kafai@fb.com> - 2016-01-12 09:30 +0100
    Re: [PATCH v2 net-next 0/4] bpf: bpf_htab: Add  BPF_MAP_TYPE_PERCPU_HASH David Miller <davem@davemloft.net> - 2016-01-12 22:50 +0100

#1307091 — [PATCH v2 net-next 0/4] bpf: bpf_htab: Add BPF_MAP_TYPE_PERCPU_HASH

V2:
Patch 1/4:
* Remove flush_elems_fn from 'struct bpf_htab' and
  also remove htab_map_flush() together
* Add htab_elem_alloc()
* Move the l_old check from htab_map_update_elem() to
  the newly added htab_map_check_update()

Patch 2/4:
* Add htab_percpu_elem_alloc()
* Add htab_percpu_map_free()
* Use this_cpu_ptr() instead of per_cpu_ptr in
  htab_percpu_map_lookup_elem()

V1 compose:
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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#1307858 — Re: [PATCH v2 net-next 0/4] bpf: bpf_htab: Add BPF_MAP_TYPE_PERCPU_HASH

From: Martin KaFai Lau <kafai@fb.com>
Date: Tue, 12 Jan 2016 00:20:48 -0800

> 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.

Please:

	http://marc.info/?l=linux-netdev&m=145248145925834&w=2

Thanks.

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