bpf: selftests: selftests for memcg stat kfuncs

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Add test coverage for the kfuncs that fetch memcg stats. Using some common
stats, test scenarios ensuring that the given stat increases by some
arbitrary amount. The stats selected cover the three categories represented
by the enums: node_stat_item, memcg_stat_item, vm_event_item.

Since only a subset of all stats are queried, use a static struct made up
of fields for each stat. Write to the struct with the fetched values when
the bpf program is invoked and read the fields in the user mode program for
verification.

Signed-off-by: JP Kobryn <inwardvessel@gmail.com>
Signed-off-by: Roman Gushchin <roman.gushchin@linux.dev>
Link: https://lore.kernel.org/r/20251223044156.208250-6-roman.gushchin@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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JP Kobryn 2025-12-22 20:41:55 -08:00 • committed by Alexei Starovoitov

parent 99430ab8b8

commit 6bce6ddbe6

3 changed files with 280 additions and 0 deletions

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18

tools/testing/selftests/bpf/cgroup_iter_memcg.h

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223

tools/testing/selftests/bpf/prog_tests/cgroup_iter_memcg.c

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39

tools/testing/selftests/bpf/progs/cgroup_iter_memcg.c

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