mbox series

[bpf-next,v2,0/2] Introduce access remote cpu elem support in BPF percpu map

Message ID 20220511093854.411-1-zhoufeng.zf@bytedance.com (mailing list archive)
Headers show
Series Introduce access remote cpu elem support in BPF percpu map | expand

Message

Feng Zhou May 11, 2022, 9:38 a.m. UTC 
From: Feng Zhou <zhoufeng.zf@bytedance.com>

Trace some functions, such as enqueue_task_fair, need to access the
corresponding cpu, not the current cpu, and bpf_map_lookup_elem percpu map
cannot do it. So add bpf_map_lookup_percpu_elem to accomplish it for
percpu_array_map, percpu_hash_map, lru_percpu_hash_map.

v1->v2: Addressed comments from Alexei Starovoitov.
- add a selftest for bpf_map_lookup_percpu_elem.

Feng Zhou (2):
  bpf: add bpf_map_lookup_percpu_elem for percpu map
  selftests/bpf: add test case for bpf_map_lookup_percpu_elem

 include/linux/bpf.h                           |  2 +
 include/uapi/linux/bpf.h                      |  9 ++++
 kernel/bpf/arraymap.c                         | 15 ++++++
 kernel/bpf/core.c                             |  1 +
 kernel/bpf/hashtab.c                          | 32 +++++++++++
 kernel/bpf/helpers.c                          | 18 +++++++
 kernel/bpf/verifier.c                         | 17 +++++-
 kernel/trace/bpf_trace.c                      |  2 +
 tools/include/uapi/linux/bpf.h                |  9 ++++
 .../bpf/prog_tests/map_lookup_percpu_elem.c   | 46 ++++++++++++++++
 .../bpf/progs/test_map_lookup_percpu_elem.c   | 54 +++++++++++++++++++
 11 files changed, 203 insertions(+), 2 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/map_lookup_percpu_elem.c
 create mode 100644 tools/testing/selftests/bpf/progs/test_map_lookup_percpu_elem.c

Comments

patchwork-bot+netdevbpf@kernel.org May 12, 2022, 1:30 a.m. UTC | #1 
Hello:

This series was applied to bpf/bpf-next.git (master)
by Alexei Starovoitov <ast@kernel.org>:

On Wed, 11 May 2022 17:38:52 +0800 you wrote:
> From: Feng Zhou <zhoufeng.zf@bytedance.com>
> 
> Trace some functions, such as enqueue_task_fair, need to access the
> corresponding cpu, not the current cpu, and bpf_map_lookup_elem percpu map
> cannot do it. So add bpf_map_lookup_percpu_elem to accomplish it for
> percpu_array_map, percpu_hash_map, lru_percpu_hash_map.
> 
> [...]

Here is the summary with links:
  - [bpf-next,v2,1/2] bpf: add bpf_map_lookup_percpu_elem for percpu map
    https://git.kernel.org/bpf/bpf-next/c/07343110b293
  - [bpf-next,v2,2/2] selftests/bpf: add test case for bpf_map_lookup_percpu_elem
    https://git.kernel.org/bpf/bpf-next/c/ed7c13776e20

You are awesome, thank you!