Allow creating an iterator that loops through resources of one task/thread. People could only create iterators to loop through all resources of files, vma, and tasks in the system, even though they were interested in only the resources of a specific task or process. Passing the addintional parameters, people can now create an iterator to go through all resources or only the resources of a task. Major Changes: - Add new parameters in bpf_iter_link_info to indicate to go through all tasks or to go through a specific task. - Change the implementations of BPF iterators of vma, files, and tasks to allow going through only the resources of a specific task. - Provide the arguments of parameterized task iterators in bpf_link_info. Differences from v3: - Fix the test case bpf_iter/test Differences from v2: - Supports tid, tgid, and pidfd. - Change 'type' from __u8 to enum bpf_task_iter_type. v3: https://lore.kernel.org/bpf/20220809063501.667610-1-kuifeng@xxxxxx/ v2: https://lore.kernel.org/bpf/20220801232649.2306614-1-kuifeng@xxxxxx/ v1: https://lore.kernel.org/bpf/20220726051713.840431-1-kuifeng@xxxxxx/ Kui-Feng Lee (3): bpf: Parameterize task iterators. bpf: Handle bpf_link_info for the parameterized task BPF iterators. selftests/bpf: Test parameterized task BPF iterators. include/linux/bpf.h | 8 + include/uapi/linux/bpf.h | 43 ++++ kernel/bpf/task_iter.c | 153 +++++++++++-- tools/include/uapi/linux/bpf.h | 43 ++++ .../selftests/bpf/prog_tests/bpf_iter.c | 208 ++++++++++++++++-- .../selftests/bpf/prog_tests/btf_dump.c | 2 +- .../selftests/bpf/progs/bpf_iter_task.c | 9 + .../selftests/bpf/progs/bpf_iter_task_file.c | 7 + .../selftests/bpf/progs/bpf_iter_task_vma.c | 6 +- 9 files changed, 430 insertions(+), 49 deletions(-) -- 2.30.2
