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Commit 944770ab authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

sched/deadline: Replace NR_CPUS arrays 



Tejun reported that his resume was failing due to order-3 allocations
from sched_domain building.

Replace the NR_CPUS arrays in there with a dynamically allocated
array.

Reported-by: default avatarTejun Heo <tj@kernel.org>
Signed-off-by: default avatarPeter Zijlstra <peterz@infradead.org>
Acked-by: default avatarJuri Lelli <juri.lelli@gmail.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/n/tip-kat4gl1m5a6dwy6nzuqox45e@git.kernel.org


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent b0827819

kernel/sched/cpudeadline.c

+24 −9
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ 


#include <linux/gfp.h>

#include <linux/kernel.h>

#include <linux/slab.h>

#include "cpudeadline.h"



static inline int parent(int i)
@@ -39,8 +40,10 @@ static void cpudl_exchange(struct cpudl *cp, int a, int b) 
{

	int cpu_a = cp->elements[a].cpu, cpu_b = cp->elements[b].cpu;



	swap(cp->elements[a], cp->elements[b]);

	swap(cp->cpu_to_idx[cpu_a], cp->cpu_to_idx[cpu_b]);

	swap(cp->elements[a].cpu, cp->elements[b].cpu);

	swap(cp->elements[a].dl , cp->elements[b].dl );



	swap(cp->elements[cpu_a].idx, cp->elements[cpu_b].idx);

}



static void cpudl_heapify(struct cpudl *cp, int idx)
@@ -140,7 +143,7 @@ void cpudl_set(struct cpudl *cp, int cpu, u64 dl, int is_valid) 
	WARN_ON(!cpu_present(cpu));



	raw_spin_lock_irqsave(&cp->lock, flags);

	old_idx = cp->cpu_to_idx[cpu];

	old_idx = cp->elements[cpu].idx;

	if (!is_valid) {

		/* remove item */

		if (old_idx == IDX_INVALID) {
@@ -155,8 +158,8 @@ void cpudl_set(struct cpudl *cp, int cpu, u64 dl, int is_valid) 
		cp->elements[old_idx].dl = cp->elements[cp->size - 1].dl;

		cp->elements[old_idx].cpu = new_cpu;

		cp->size--;

		cp->cpu_to_idx[new_cpu] = old_idx;

		cp->cpu_to_idx[cpu] = IDX_INVALID;

		cp->elements[new_cpu].idx = old_idx;

		cp->elements[cpu].idx = IDX_INVALID;

		while (old_idx > 0 && dl_time_before(

				cp->elements[parent(old_idx)].dl,

				cp->elements[old_idx].dl)) {
@@ -173,7 +176,7 @@ void cpudl_set(struct cpudl *cp, int cpu, u64 dl, int is_valid) 
		cp->size++;

		cp->elements[cp->size - 1].dl = 0;

		cp->elements[cp->size - 1].cpu = cpu;

		cp->cpu_to_idx[cpu] = cp->size - 1;

		cp->elements[cpu].idx = cp->size - 1;

		cpudl_change_key(cp, cp->size - 1, dl);

		cpumask_clear_cpu(cpu, cp->free_cpus);

	} else {
@@ -195,10 +198,21 @@ int cpudl_init(struct cpudl *cp) 
	memset(cp, 0, sizeof(*cp));

	raw_spin_lock_init(&cp->lock);

	cp->size = 0;

	for (i = 0; i < NR_CPUS; i++)

		cp->cpu_to_idx[i] = IDX_INVALID;

	if (!alloc_cpumask_var(&cp->free_cpus, GFP_KERNEL))



	cp->elements = kcalloc(nr_cpu_ids,

			       sizeof(struct cpudl_item),

			       GFP_KERNEL);

	if (!cp->elements)

		return -ENOMEM;



	if (!alloc_cpumask_var(&cp->free_cpus, GFP_KERNEL)) {

		kfree(cp->elements);

		return -ENOMEM;

	}



	for_each_possible_cpu(i)

		cp->elements[i].idx = IDX_INVALID;



	cpumask_setall(cp->free_cpus);



	return 0;
@@ -211,4 +225,5 @@ int cpudl_init(struct cpudl *cp) 
void cpudl_cleanup(struct cpudl *cp)

{

	free_cpumask_var(cp->free_cpus);

	kfree(cp->elements);

}

kernel/sched/cpudeadline.h

+3 −3
Original line number Diff line number Diff line
@@ -5,17 +5,17 @@ 


#define IDX_INVALID     -1



struct array_item {

struct cpudl_item {

	u64 dl;

	int cpu;

	int idx;

};



struct cpudl {

	raw_spinlock_t lock;

	int size;

	int cpu_to_idx[NR_CPUS];

	struct array_item elements[NR_CPUS];

	cpumask_var_t free_cpus;

	struct cpudl_item *elements;

};