Re: [RFC PATCH bpf-next 0/3] bpf: Expand bpf_cgrp_storage to support cgroup1 non-attach case

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On Tue, Dec 05, 2023 at 02:37:22PM +0000, Yafang Shao wrote:
> In the current cgroup1 environment, associating operations between a cgroup
> and applications in a BPF program requires storing a mapping of cgroup_id
> to application either in a hash map or maintaining it in userspace.
> However, by enabling bpf_cgrp_storage for cgroup1, it becomes possible to
> conveniently store application-specific information in cgroup-local storage
> and utilize it within BPF programs. Furthermore, enabling this feature for
> cgroup1 involves minor modifications for the non-attach case, streamlining
> the process.
> 
> However, when it comes to enabling this functionality for the cgroup1
> attach case, it presents challenges. Therefore, the decision is to focus on
> enabling it solely for the cgroup1 non-attach case at present. If
> attempting to attach to a cgroup1 fd, the operation will simply fail with
> the error code -EBADF.
> 
> Yafang Shao (3):
>   bpf: Enable bpf_cgrp_storage for cgroup1 non-attach case
>   selftests/bpf: Add a new cgroup helper open_classid()
>   selftests/bpf: Add selftests for cgroup1 local storage

Acked-by: Tejun Heo <tj@xxxxxxxxxx>

Thanks.

-- 
tejun




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