Re: [PATCH bpf-next v9 0/4] Support storing struct task_struct objects as kptrs

patchwork-bot+netdevbpf
2022-11-20T17:30:24Z

Hello:

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

On Sat, 19 Nov 2022 23:10:00 -0600 you wrote:
> Now that BPF supports adding new kernel functions with kfuncs, and
> storing kernel objects in maps with kptrs, we can add a set of kfuncs
> which allow struct task_struct objects to be stored in maps as
> referenced kptrs.
>
> The possible use cases for doing this are plentiful. During tracing,
> for example, it would be useful to be able to collect some tasks that
> performed a certain operation, and then periodically summarize who they
> are, which cgroup they're in, how much CPU time they've utilized, etc.
> Doing this now would require storing the tasks' pids along with some
> relevant data to be exported to user space, and later associating the
> pids to tasks in other event handlers where the data is recorded.
> Another useful by-product of this is that it allows a program to pin a
> task in a BPF program, and by proxy therefore also e.g. pin its task
> local storage.
>
> [...]

Here is the summary with links:
- [bpf-next,v9,1/4] bpf: Allow multiple modifiers in reg_type_str() prefix
https://git.kernel.org/bpf/bpf-next/c/ef66c5475d7f
- [bpf-next,v9,2/4] bpf: Allow trusted pointers to be passed to KF_TRUSTED_ARGS kfuncs
https://git.kernel.org/bpf/bpf-next/c/3f00c5239344
- [bpf-next,v9,3/4] bpf: Add kfuncs for storing struct task_struct * as a kptr
https://git.kernel.org/bpf/bpf-next/c/90660309b0c7
- [bpf-next,v9,4/4] bpf/selftests: Add selftests for new task kfuncs
https://git.kernel.org/bpf/bpf-next/c/fe147956fca4

You are awesome, thank you!
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