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    Subject[RFC PATCH 05/23] sched/core: Move is_core_idle() out of fair.c
    Date
    Information about the idle state of the SMT siblings of a core can
    be used to improve the accuracy of the classification of the current task.

    Move is_core_idle() to sched.h to make it available to scheduler_tick().

    Cc: Ben Segall <bsegall@google.com>
    Cc: Daniel Bristot de Oliveira <bristot@redhat.com>
    Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
    Cc: Len Brown <len.brown@intel.com>
    Cc: Mel Gorman <mgorman@suse.de>
    Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
    Cc: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
    Cc: Steven Rostedt <rostedt@goodmis.org>
    Cc: Tim C. Chen <tim.c.chen@intel.com>
    Cc: Valentin Schneider <vschneid@redhat.com>
    Cc: x86@kernel.org
    Cc: linux-kernel@vger.kernel.org
    Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
    ---
    kernel/sched/fair.c | 17 -----------------
    kernel/sched/sched.h | 17 +++++++++++++++++
    2 files changed, 17 insertions(+), 17 deletions(-)

    diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
    index 0089b33ea7b8..2f2a6bb5990d 100644
    --- a/kernel/sched/fair.c
    +++ b/kernel/sched/fair.c
    @@ -1536,23 +1536,6 @@ struct numa_stats {
    int idle_cpu;
    };

    -static inline bool is_core_idle(int cpu)
    -{
    -#ifdef CONFIG_SCHED_SMT
    - int sibling;
    -
    - for_each_cpu(sibling, cpu_smt_mask(cpu)) {
    - if (cpu == sibling)
    - continue;
    -
    - if (!idle_cpu(sibling))
    - return false;
    - }
    -#endif
    -
    - return true;
    -}
    -
    struct task_numa_env {
    struct task_struct *p;

    diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
    index 719bdba660e2..2bddedc55ee9 100644
    --- a/kernel/sched/sched.h
    +++ b/kernel/sched/sched.h
    @@ -3212,6 +3212,23 @@ static inline bool is_per_cpu_kthread(struct task_struct *p)
    }
    #endif

    +static inline bool is_core_idle(int cpu)
    +{
    +#ifdef CONFIG_SCHED_SMT
    + int sibling;
    +
    + for_each_cpu(sibling, cpu_smt_mask(cpu)) {
    + if (cpu == sibling)
    + continue;
    +
    + if (!idle_cpu(sibling))
    + return false;
    + }
    +#endif
    +
    + return true;
    +}
    +
    extern void swake_up_all_locked(struct swait_queue_head *q);
    extern void __prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wait);

    --
    2.25.1
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