• Roman Gushchin's avatar
    bpf: introduce per-cpu cgroup local storage · b741f163
    Roman Gushchin authored
    This commit introduced per-cpu cgroup local storage.
    Per-cpu cgroup local storage is very similar to simple cgroup storage
    (let's call it shared), except all the data is per-cpu.
    The main goal of per-cpu variant is to implement super fast
    counters (e.g. packet counters), which don't require neither
    lookups, neither atomic operations.
    >From userspace's point of view, accessing a per-cpu cgroup storage
    is similar to other per-cpu map types (e.g. per-cpu hashmaps and
    Writing to a per-cpu cgroup storage is not atomic, but is performed
    by copying longs, so some minimal atomicity is here, exactly
    as with other per-cpu maps.
    Signed-off-by: default avatarRoman Gushchin <guro@fb.com>
    Cc: Daniel Borkmann <daniel@iogearbox.net>
    Cc: Alexei Starovoitov <ast@kernel.org>
    Acked-by: default avatarSong Liu <songliubraving@fb.com>
    Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
bpf-cgroup.h 10.9 KB