From: Hou Tao <houtao1@xxxxxxxxxx> Hi, The patchset aims to fix the reported warning [0] when the unit_size of bpf_mem_cache is mismatched with the object size of underly slab-cache. Patch #1 fixes the warning by adjusting size_index according to the value of KMALLOC_MIN_SIZE, so bpf_mem_cache with unit_size which is smaller than KMALLOC_MIN_SIZE or is not aligned with KMALLOC_MIN_SIZE will be redirected to bpf_mem_cache with bigger unit_size. Patch #2 doesn't do prefill for these redirected bpf_mem_cache to save memory. Patch #3 adds further error check in bpf_mem_alloc_init() to ensure the unit_size and object_size are always matched and to prevent potential issues due to the mismatch. Please see individual patches for more details. And comments are always welcome. [0]: https://lore.kernel.org/bpf/87jztjmmy4.fsf@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx Hou Tao (4): bpf: Adjust size_index according to the value of KMALLOC_MIN_SIZE bpf: Don't prefill for unused bpf_mem_cache bpf: Ensure unit_size is matched with slab cache object size selftests/bpf: Test all valid alloc sizes for bpf mem allocator kernel/bpf/memalloc.c | 87 ++++++++++++- .../selftests/bpf/prog_tests/test_bpf_ma.c | 50 +++++++ .../testing/selftests/bpf/progs/test_bpf_ma.c | 123 ++++++++++++++++++ 3 files changed, 256 insertions(+), 4 deletions(-) create mode 100644 tools/testing/selftests/bpf/prog_tests/test_bpf_ma.c create mode 100644 tools/testing/selftests/bpf/progs/test_bpf_ma.c -- 2.29.2
