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bpf: Parameterize task iterators.

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Allow creating an iterator that loops through resources of one
thread/process.

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
additional parameters, people can now create an iterator to go
through all resources or only the resources of a task.

Signed-off-by: Kui-Feng Lee <kuifeng@fb.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Acked-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/bpf/20220926184957.208194-2-kuifeng@fb.com
This commit is contained in:
Kui-Feng Lee
2022-09-26 11:49:53 -07:00
committed by Andrii Nakryiko
parent 87dbdc230d
commit f0d74c4da1
4 changed files with 203 additions and 22 deletions
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6
include/uapi/linux/bpf.h
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@@ -110,6 +110,12 @@ union bpf_iter_link_info {
__u32 cgroup_fd;
__u64 cgroup_id;
} cgroup;
/* Parameters of task iterators. */
struct {
__u32 tid;
__u32 pid;
__u32 pid_fd;
} task;
};
/* BPF syscall commands, see bpf(2) man-page for more details. */