• Tejun Heo's avatar
    cgroup: replace cgroup_on_dfl() tests in controllers with cgroup_subsys_on_dfl() · 9e10a130
    Tejun Heo authored
    cgroup_on_dfl() tests whether the cgroup's root is the default
    hierarchy; however, an individual controller is only interested in
    whether the controller is attached to the default hierarchy and never
    tests a cgroup which doesn't belong to the hierarchy that the
    controller is attached to.
    This patch replaces cgroup_on_dfl() tests in controllers with faster
    static_key based cgroup_subsys_on_dfl().  This leaves cgroup core as
    the only user of cgroup_on_dfl() and the function is moved from the
    header file to cgroup.c.
    Signed-off-by: default avatarTejun Heo <tj@kernel.org>
    Acked-by: default avatarZefan Li <lizefan@huawei.com>
    Cc: Vivek Goyal <vgoyal@redhat.com>
    Cc: Jens Axboe <axboe@kernel.dk>
    Cc: Johannes Weiner <hannes@cmpxchg.org>
    Cc: Michal Hocko <mhocko@kernel.org>
cfq-iosched.c 123 KB