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    Subject[PATCH v3 09/14] cpuset: Don't use the cpu_possible_mask as a last resort for cgroup v1
    Date
    If the scheduler cannot find an allowed CPU for a task,
    cpuset_cpus_allowed_fallback() will widen the affinity to cpu_possible_mask
    if cgroup v1 is in use.

    In preparation for allowing architectures to provide their own fallback
    mask, just return early if we're not using cgroup v2 and allow
    select_fallback_rq() to figure out the mask by itself.

    Cc: Li Zefan <lizefan@huawei.com>
    Cc: Tejun Heo <tj@kernel.org>
    Cc: Johannes Weiner <hannes@cmpxchg.org>
    Signed-off-by: Will Deacon <will@kernel.org>
    ---
    kernel/cgroup/cpuset.c | 6 ++++--
    1 file changed, 4 insertions(+), 2 deletions(-)

    diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
    index 57b5b5d0a5fd..e970737c3ed2 100644
    --- a/kernel/cgroup/cpuset.c
    +++ b/kernel/cgroup/cpuset.c
    @@ -3299,9 +3299,11 @@ void cpuset_cpus_allowed(struct task_struct *tsk, struct cpumask *pmask)

    void cpuset_cpus_allowed_fallback(struct task_struct *tsk)
    {
    + if (!is_in_v2_mode())
    + return; /* select_fallback_rq will try harder */
    +
    rcu_read_lock();
    - do_set_cpus_allowed(tsk, is_in_v2_mode() ?
    - task_cs(tsk)->cpus_allowed : cpu_possible_mask);
    + do_set_cpus_allowed(tsk, task_cs(tsk)->cpus_allowed);
    rcu_read_unlock();

    /*
    --
    2.29.2.299.gdc1121823c-goog
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