selftests/bpf: Add tests for memory usage for arena

Allocate and free arena pages, both from BPF and via user-space fault-in,
and check that the map's memlock in fdinfo tracks the number of pages that
are actually populated.

Like the other arena tests it runs serially.

test:
  ./test_progs -a arena_mem_usage
  #5       arena_mem_usage:OK
  Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED

Signed-off-by: Jiayuan Chen <jiayuan.chen@linux.dev>
Reviewed-by: Emil Tsalapatis <emil@etsalapatis.com>
Link: https://lore.kernel.org/bpf/20260717114117.350851-5-jiayuan.chen@linux.dev
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>

0 files changed, 0 insertions, 0 deletions