From: Brahmajit Das <[email protected]> bpf_get_root_mem_cgroup(), bpf_mem_cgroup_usage(), bpf_mem_cgroup_memory_events() and bpf_proactive_reclaim() have no selftest coverage. Patch 2 adds a memcg_kfuncs test for them, plus verifier tests for their acquire/release, NULL and program type rules.
Patch 1 moves the alloc_pagecache() helper from arena_memcg to cgroup_helpers so the new test can share it instead of carrying a copy. Tested on bpf-next with vmtest.sh (x86_64): all memcg_kfuncs and memcg_kfuncs_failure subtests pass, and arena_memcg still passes. --- v3 -> v4: - Move alloc_pagecache() to cgroup_helpers.c and share it with arena_memcg instead of duplicating it (new patch 1). (CI review) v2 -> v3: - Drop the upper bound on the bpf_proactive_reclaim() result; only the request is clamped and reclaim may overshoot. Fix the commit message accordingly. (CI review) - Print the reason before skipping. (CI review) v1 -> v2: - Also check that negative indices are rejected by bpf_mem_cgroup_memory_events() and bpf_mem_cgroup_vm_events() (Sashiko) v3: https://lore.kernel.org/bpf/[email protected]/ v2: https://lore.kernel.org/bpf/[email protected]/ v1: https://lore.kernel.org/bpf/[email protected]/ Brahmajit Das (2): selftests/bpf: Move alloc_pagecache() to cgroup_helpers selftests/bpf: Add tests for memcg kfuncs tools/testing/selftests/bpf/cgroup_helpers.c | 34 +++ tools/testing/selftests/bpf/cgroup_helpers.h | 1 + .../selftests/bpf/prog_tests/arena_memcg.c | 34 --- .../selftests/bpf/prog_tests/memcg_kfuncs.c | 273 ++++++++++++++++++ .../selftests/bpf/progs/memcg_kfuncs.c | 106 +++++++ .../bpf/progs/memcg_kfuncs_failure.c | 54 ++++ 6 files changed, 468 insertions(+), 34 deletions(-) create mode 100644 tools/testing/selftests/bpf/prog_tests/memcg_kfuncs.c create mode 100644 tools/testing/selftests/bpf/progs/memcg_kfuncs.c create mode 100644 tools/testing/selftests/bpf/progs/memcg_kfuncs_failure.c -- 2.56.0
