kernel/sched/cpudeadline.c

25 static void cpudl_heapify_down(struct cpudl *cp, int idx)
29 	int orig_cpu = cp->elements[idx].cpu;
30 	u64 orig_dl = cp->elements[idx].dl;
32 	if (left_child(idx) >= cp->size)
44 		if ((l < cp->size) && dl_time_before(orig_dl,
45 						cp->elements[l].dl)) {
47 			largest_dl = cp->elements[l].dl;
49 		if ((r < cp->size) && dl_time_before(largest_dl,
50 						cp->elements[r].dl))
57 		cp->elements[idx].cpu = cp->elements[largest].cpu;
58 		cp->elements[idx].dl = cp->elements[largest].dl;
59 		cp->elements[cp->elements[idx].cpu].idx = idx;
63 	cp->elements[idx].cpu = orig_cpu;
64 	cp->elements[idx].dl = orig_dl;
65 	cp->elements[cp->elements[idx].cpu].idx = idx;
68 static void cpudl_heapify_up(struct cpudl *cp, int idx)
72 	int orig_cpu = cp->elements[idx].cpu;
73 	u64 orig_dl = cp->elements[idx].dl;
80 		if (dl_time_before(orig_dl, cp->elements[p].dl))
83 		cp->elements[idx].cpu = cp->elements[p].cpu;
84 		cp->elements[idx].dl = cp->elements[p].dl;
85 		cp->elements[cp->elements[idx].cpu].idx = idx;
89 	cp->elements[idx].cpu = orig_cpu;
90 	cp->elements[idx].dl = orig_dl;
91 	cp->elements[cp->elements[idx].cpu].idx = idx;
94 static void cpudl_heapify(struct cpudl *cp, int idx)
96 	if (idx > 0 && dl_time_before(cp->elements[parent(idx)].dl,
97 				cp->elements[idx].dl))
98 		cpudl_heapify_up(cp, idx);
100 		cpudl_heapify_down(cp, idx);
103 static inline int cpudl_maximum(struct cpudl *cp)
105 	return cp->elements[0].cpu;
110  * @cp: the cpudl max-heap context
116 int cpudl_find(struct cpudl *cp, struct task_struct *p,
122 	    cpumask_and(later_mask, cp->free_cpus, &p->cpus_mask)) {
149 		int best_cpu = cpudl_maximum(cp);
154 		    dl_time_before(dl_se->deadline, cp->elements[0].dl)) {
166  * @cp: the cpudl max-heap context
173 void cpudl_clear(struct cpudl *cp, int cpu)
180 	raw_spin_lock_irqsave(&cp->lock, flags);
182 	old_idx = cp->elements[cpu].idx;
190 		new_cpu = cp->elements[cp->size - 1].cpu;
191 		cp->elements[old_idx].dl = cp->elements[cp->size - 1].dl;
192 		cp->elements[old_idx].cpu = new_cpu;
193 		cp->size--;
194 		cp->elements[new_cpu].idx = old_idx;
195 		cp->elements[cpu].idx = IDX_INVALID;
196 		cpudl_heapify(cp, old_idx);
198 		cpumask_set_cpu(cpu, cp->free_cpus);
200 	raw_spin_unlock_irqrestore(&cp->lock, flags);
205  * @cp: the cpudl max-heap context
213 void cpudl_set(struct cpudl *cp, int cpu, u64 dl)
220 	raw_spin_lock_irqsave(&cp->lock, flags);
222 	old_idx = cp->elements[cpu].idx;
224 		int new_idx = cp->size++;
226 		cp->elements[new_idx].dl = dl;
227 		cp->elements[new_idx].cpu = cpu;
228 		cp->elements[cpu].idx = new_idx;
229 		cpudl_heapify_up(cp, new_idx);
230 		cpumask_clear_cpu(cpu, cp->free_cpus);
232 		cp->elements[old_idx].dl = dl;
233 		cpudl_heapify(cp, old_idx);
236 	raw_spin_unlock_irqrestore(&cp->lock, flags);
241  * @cp: the cpudl max-heap context
244 void cpudl_set_freecpu(struct cpudl *cp, int cpu)
246 	cpumask_set_cpu(cpu, cp->free_cpus);
251  * @cp: the cpudl max-heap context
254 void cpudl_clear_freecpu(struct cpudl *cp, int cpu)
256 	cpumask_clear_cpu(cpu, cp->free_cpus);
261  * @cp: the cpudl max-heap context
263 int cpudl_init(struct cpudl *cp)
267 	raw_spin_lock_init(&cp->lock);
268 	cp->size = 0;
270 	cp->elements = kcalloc(nr_cpu_ids,
273 	if (!cp->elements)
276 	if (!zalloc_cpumask_var(&cp->free_cpus, GFP_KERNEL)) {
277 		kfree(cp->elements);
282 		cp->elements[i].idx = IDX_INVALID;
289  * @cp: the cpudl max-heap context
291 void cpudl_cleanup(struct cpudl *cp)
293 	free_cpumask_var(cp->free_cpus);
294 	kfree(cp->elements);