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Account memory used by cgroup storage maps including metadata
structures.

Account the percpu memory for the percpu flavor of cgroup storage.
Signed-off-by: Roman Gushchin <guro@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20201201215900.3569844-11-guro@fb.com