bpf: Memcg-based memory accounting for bpf maps
This patch enables memcg-based memory accounting for memory allocated by __bpf_map_area_alloc(), which is used by many types of bpf maps for large initial memory allocations. Please note, that __bpf_map_area_alloc() should not be used outside of map creation paths without setting the active memory cgroup to the map's memory cgroup. Following patches in the series will refine the accounting for some of the map types. Signed-off-by: Roman Gushchin <guro@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20201201215900.3569844-8-guro@fb.com
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