From: Martin KaFai Lau <kafai@fb.com>
To: <netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Cc: Alexei Starovoitov <alexei.starovoitov@gmail.com>,
Ming Lei <tom.leiming@gmail.com>,
FB Kernel Team <kernel-team@fb.com>
Subject: [PATCH v2 net-next 0/4] bpf: bpf_htab: Add BPF_MAP_TYPE_PERCPU_HASH
Date: Tue, 12 Jan 2016 00:20:48 -0800 [thread overview]
Message-ID: <1452586852-1575604-1-git-send-email-kafai@fb.com> (raw)
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.
next reply other threads:[~2016-01-12 8:21 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-12 8:20 Martin KaFai Lau [this message]
2016-01-12 8:20 ` [PATCH v2 net-next 1/4] bpf: bpf_htab: Refactor some htab_elem logic Martin KaFai Lau
2016-01-12 8:20 ` [PATCH v2 net-next 2/4] bpf: bpf_htab: Add BPF_MAP_TYPE_PERCPU_HASH Martin KaFai Lau
2016-01-12 8:20 ` [PATCH v2 net-next 3/4] bpf: bpf_htab: Add syscall to iterate percpu value of a key Martin KaFai Lau
2016-01-13 2:24 ` Eric Dumazet
2016-01-13 2:42 ` Ming Lei
2016-01-13 5:23 ` Alexei Starovoitov
2016-01-13 15:43 ` Ming Lei
2016-01-14 1:24 ` Alexei Starovoitov
2016-01-14 3:23 ` Ming Lei
2016-01-12 8:20 ` [PATCH v2 net-next 4/4] bpf: bpf_htab: Test for BPF_MAP_TYPE_PERCPU_HASH Martin KaFai Lau
2016-01-12 21:45 ` [PATCH v2 net-next 0/4] bpf: bpf_htab: Add BPF_MAP_TYPE_PERCPU_HASH David Miller
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