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author | Chuyi Zhou <zhouchuyi@bytedance.com> | 2023-10-18 09:17:46 +0300 |
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committer | Alexei Starovoitov <ast@kernel.org> | 2023-10-20 03:02:47 +0300 |
commit | 130e0f7af9fc7388b90fb016ca13ff3840c48d4a (patch) | |
tree | 11630b18cf327fe18688c437a20edaa9acfe364d /kernel/bpf/cgroup_iter.c | |
parent | ddab78cbb52f81f7f7598482602342955b2ff8b8 (diff) | |
download | linux-130e0f7af9fc7388b90fb016ca13ff3840c48d4a.tar.xz |
selftests/bpf: Add tests for open-coded task and css iter
This patch adds 4 subtests to demonstrate these patterns and validating
correctness.
subtest1:
1) We use task_iter to iterate all process in the system and search for the
current process with a given pid.
2) We create some threads in current process context, and use
BPF_TASK_ITER_PROC_THREADS to iterate all threads of current process. As
expected, we would find all the threads of current process.
3) We create some threads and use BPF_TASK_ITER_ALL_THREADS to iterate all
threads in the system. As expected, we would find all the threads which was
created.
subtest2:
We create a cgroup and add the current task to the cgroup. In the
BPF program, we would use bpf_for_each(css_task, task, css) to iterate all
tasks under the cgroup. As expected, we would find the current process.
subtest3:
1) We create a cgroup tree. In the BPF program, we use
bpf_for_each(css, pos, root, XXX) to iterate all descendant under the root
with pre and post order. As expected, we would find all descendant and the
last iterating cgroup in post-order is root cgroup, the first iterating
cgroup in pre-order is root cgroup.
2) We wse BPF_CGROUP_ITER_ANCESTORS_UP to traverse the cgroup tree starting
from leaf and root separately, and record the height. The diff of the
hights would be the total tree-high - 1.
subtest4:
Add some failure testcase when using css_task, task and css iters, e.g,
unlock when using task-iters to iterate tasks.
Signed-off-by: Chuyi Zhou <zhouchuyi@bytedance.com>
Link: https://lore.kernel.org/r/20231018061746.111364-9-zhouchuyi@bytedance.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'kernel/bpf/cgroup_iter.c')
0 files changed, 0 insertions, 0 deletions