/* 10 */ 110, 87, 70, 56, 45, 36, 29, 23, 18, 15,
};
+/*
+ * Inverse (2^32/x) values of the prio_to_weight[] array, precalculated.
+ *
+ * In cases where the weight does not change often, we can use the
+ * precalculated inverse to speed up arithmetics by turning divisions
+ * into multiplications:
+ */
static const u32 prio_to_wmult[40] = {
- 48356, 60446, 75558, 94446, 118058, 147573,
- 184467, 230589, 288233, 360285, 450347,
- 562979, 703746, 879575, 1099582, 1374389,
- 1717986, 2147483, 2684354, 3355443, 4194304,
- 5244160, 6557201, 8196502, 10250518, 12782640,
- 16025997, 19976592, 24970740, 31350126, 39045157,
- 49367440, 61356675, 76695844, 95443717, 119304647,
- 148102320, 186737708, 238609294, 286331153,
+/* -20 */ 48356, 60446, 75558, 94446, 118058,
+/* -15 */ 147573, 184467, 230589, 288233, 360285,
+/* -10 */ 450347, 562979, 703746, 879575, 1099582,
+/* -5 */ 1374389, 1717986, 2147483, 2684354, 3355443,
+/* 0 */ 4194304, 5244160, 6557201, 8196502, 10250518,
+/* 5 */ 12782640, 16025997, 19976592, 24970740, 31350126,
+/* 10 */ 39045157, 49367440, 61356675, 76695844, 95443717,
+/* 15 */ 119304647, 148102320, 186737708, 238609294, 286331153,
};
static inline void
struct migration_req *req;
struct list_head *head;
- try_to_freeze();
-
spin_lock_irq(&rq->lock);
if (cpu_is_offline(cpu)) {
p = kthread_create(migration_thread, hcpu, "migration/%d", cpu);
if (IS_ERR(p))
return NOTIFY_BAD;
- p->flags |= PF_NOFREEZE;
kthread_bind(p, cpu);
/* Must be high prio: stop_machine expects to yield to it. */
rq = task_rq_lock(p, &flags);