cpuset: clean up cpuset hierarchy traversal code
Use cpuset.stack_list rather than kfifo, so we avoid memory allocation for kfifo. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: Paul Menage <menage@google.com> Cc: Cedric Le Goater <clg@fr.ibm.com> Cc: Balbir Singh <balbir@in.ibm.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Paul Jackson <pj@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -54,7 +54,6 @@
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#include <asm/uaccess.h>
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#include <asm/atomic.h>
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#include <linux/mutex.h>
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#include <linux/kfifo.h>
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#include <linux/workqueue.h>
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#include <linux/cgroup.h>
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@ -557,7 +556,7 @@ update_domain_attr_tree(struct sched_domain_attr *dattr, struct cpuset *c)
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* So the reverse nesting would risk an ABBA deadlock.
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*
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* The three key local variables below are:
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* q - a kfifo queue of cpuset pointers, used to implement a
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* q - a linked-list queue of cpuset pointers, used to implement a
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* top-down scan of all cpusets. This scan loads a pointer
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* to each cpuset marked is_sched_load_balance into the
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* array 'csa'. For our purposes, rebuilding the schedulers
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@ -592,7 +591,7 @@ update_domain_attr_tree(struct sched_domain_attr *dattr, struct cpuset *c)
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void rebuild_sched_domains(void)
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{
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struct kfifo *q; /* queue of cpusets to be scanned */
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LIST_HEAD(q); /* queue of cpusets to be scanned*/
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struct cpuset *cp; /* scans q */
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struct cpuset **csa; /* array of all cpuset ptrs */
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int csn; /* how many cpuset ptrs in csa so far */
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@ -602,7 +601,6 @@ void rebuild_sched_domains(void)
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int ndoms; /* number of sched domains in result */
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int nslot; /* next empty doms[] cpumask_t slot */
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q = NULL;
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csa = NULL;
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doms = NULL;
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dattr = NULL;
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@ -622,20 +620,19 @@ void rebuild_sched_domains(void)
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goto rebuild;
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}
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q = kfifo_alloc(number_of_cpusets * sizeof(cp), GFP_KERNEL, NULL);
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if (IS_ERR(q))
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goto done;
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csa = kmalloc(number_of_cpusets * sizeof(cp), GFP_KERNEL);
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if (!csa)
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goto done;
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csn = 0;
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cp = &top_cpuset;
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__kfifo_put(q, (void *)&cp, sizeof(cp));
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while (__kfifo_get(q, (void *)&cp, sizeof(cp))) {
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list_add(&top_cpuset.stack_list, &q);
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while (!list_empty(&q)) {
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struct cgroup *cont;
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struct cpuset *child; /* scans child cpusets of cp */
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cp = list_first_entry(&q, struct cpuset, stack_list);
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list_del(q.next);
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if (cpus_empty(cp->cpus_allowed))
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continue;
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@ -652,7 +649,7 @@ void rebuild_sched_domains(void)
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list_for_each_entry(cont, &cp->css.cgroup->children, sibling) {
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child = cgroup_cs(cont);
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__kfifo_put(q, (void *)&child, sizeof(cp));
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list_add_tail(&child->stack_list, &q);
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}
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}
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@ -735,8 +732,6 @@ rebuild:
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put_online_cpus();
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done:
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if (q && !IS_ERR(q))
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kfifo_free(q);
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kfree(csa);
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/* Don't kfree(doms) -- partition_sched_domains() does that. */
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/* Don't kfree(dattr) -- partition_sched_domains() does that. */
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