disable stealing by default

hulk inclusion
category: feature
bugzilla: 38261, https://bugzilla.openeuler.org/show_bug.cgi?id=23
CVE: NA

---------------------------

Steal tasks to improve CPU utilization can solve some performance
problems such as mysql, but not all scenarios are optimized, such as
hackbench.

So turn off by default.
Signed-off-by: NCheng Jian <cj.chengjian@huawei.com>
Reviewed-by: NHanjun Guo <guohanjun@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>
Reviewed-by: NXie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

kernel/sched/features.h

@@ -62,7 +62,7 @@ SCHED_FEAT(SIS_PROP, true)
  * Steal a CFS task from another CPU when going idle.
  * Improves CPU utilization.
  */
-SCHED_FEAT(STEAL, true)
+SCHED_FEAT(STEAL, false)
 
 /*
  * Issue a WARN when we do multiple update_rq_clock() calls