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bpf: Introduce task open coded iterator kfuncs

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This patch adds kfuncs bpf_iter_task_{new,next,destroy} which allow
creation and manipulation of struct bpf_iter_task in open-coded iterator
style. BPF programs can use these kfuncs or through bpf_for_each macro to
iterate all processes in the system.

The API design keep consistent with SEC("iter/task"). bpf_iter_task_new()
accepts a specific task and iterating type which allows:

1. iterating all process in the system (BPF_TASK_ITER_ALL_PROCS)

2. iterating all threads in the system (BPF_TASK_ITER_ALL_THREADS)

3. iterating all threads of a specific task (BPF_TASK_ITER_PROC_THREADS)

Signed-off-by: Chuyi Zhou <zhouchuyi@bytedance.com>
Link: https://lore.kernel.org/r/20231018061746.111364-4-zhouchuyi@bytedance.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Chuyi Zhou
2023-10-18 14:17:41 +08:00
committed by Alexei Starovoitov
parent 9c66dc94b6
commit c68a78ffe2
3 changed files with 98 additions and 0 deletions
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5
tools/testing/selftests/bpf/bpf_experimental.h
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@ -465,5 +465,10 @@ extern int bpf_iter_css_task_new(struct bpf_iter_css_task *it,
extern struct task_struct *bpf_iter_css_task_next(struct bpf_iter_css_task *it) __weak __ksym;
extern void bpf_iter_css_task_destroy(struct bpf_iter_css_task *it) __weak __ksym;
struct bpf_iter_task;
extern int bpf_iter_task_new(struct bpf_iter_task *it,
struct task_struct *task, unsigned int flags) __weak __ksym;
extern struct task_struct *bpf_iter_task_next(struct bpf_iter_task *it) __weak __ksym;
extern void bpf_iter_task_destroy(struct bpf_iter_task *it) __weak __ksym;
#endif