sched: Simplify can_migrate_task()

At this point tsk_cache_hot is always true, so no need to check it.

Signed-off-by: Zhang Hang <bob.zhanghang@huawei.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/51650107.9040606@huawei.com
[ Also remove unnecessary schedstat #ifdefs. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 539760e..bf8ab4f 100644 (file)
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3921,20 +3921,17 @@ int can_migrate_task(struct task_struct *p, struct lb_env *env)
        tsk_cache_hot = task_hot(p, env->src_rq->clock_task, env->sd);
        if (!tsk_cache_hot ||
                env->sd->nr_balance_failed > env->sd->cache_nice_tries) {
-#ifdef CONFIG_SCHEDSTATS
+
                if (tsk_cache_hot) {
                        schedstat_inc(env->sd, lb_hot_gained[env->idle]);
                        schedstat_inc(p, se.statistics.nr_forced_migrations);
                }
-#endif
+
                return 1;
        }
 
-       if (tsk_cache_hot) {
-               schedstat_inc(p, se.statistics.nr_failed_migrations_hot);
-               return 0;
-       }
-       return 1;
+       schedstat_inc(p, se.statistics.nr_failed_migrations_hot);
+       return 0;
 }
 
 /*