Merge branch 'remove-unnecessary-synchronizations-in-cpumap'
authorAlexei Starovoitov <ast@kernel.org>
Mon, 21 Aug 2023 22:21:16 +0000 (15:21 -0700)
committerAlexei Starovoitov <ast@kernel.org>
Mon, 21 Aug 2023 22:21:16 +0000 (15:21 -0700)
commit5bebd3e3a37dc00c6dbbcd0eb5cebd58e3f18f64
treea3e9247534fe1fcb2809caabc9ba62daa7e6e381
parent0a55264cf966fb95ebf9d03d9f81fa992f069312
parentc2e42ddf26cad03ea92400c88b024e8ce1601dff
Merge branch 'remove-unnecessary-synchronizations-in-cpumap'

Hou Tao says:

====================
Remove unnecessary synchronizations in cpumap

From: Hou Tao <houtao1@huawei.com>

Hi,

This is the formal patchset to remove unnecessary synchronizations in
cpu-map after address comments and collect Rvb tags from Toke
Høiland-Jørgensen (Big thanks to Toke). Patch #1 removes the unnecessary
rcu_barrier() when freeing bpf_cpu_map_entry and replaces it by
queue_rcu_work(). Patch #2 removes the unnecessary call_rcu() and
queue_work() when destroying cpu-map and does the freeing directly.

Test the patchset by using xdp_redirect_cpu and virtio-net. Both
xdp-mode and skb-mode have been exercised and no issues were reported.
As ususal, comments and suggestions are always welcome.

Change Log:
v1:
  * address comments from Toke Høiland-Jørgensen
  * add Rvb tags from Toke Høiland-Jørgensen
  * update outdated comment in cpu_map_delete_elem()

RFC: https://lore.kernel.org/bpf/20230728023030.1906124-1-houtao@huaweicloud.com
====================

Link: https://lore.kernel.org/r/20230816045959.358059-1-houtao@huaweicloud.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>