cpuset: remove cpuset->parent
cgroup already tracks the hierarchy. Follow cgroup->parent to find the parent and drop cpuset->parent. Signed-off-by: Tejun Heo <tj@kernel.org> Reviewed-by: Michal Hocko <mhocko@suse.cz> Acked-by: Li Zefan <lizefan@huawei.com>
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@ -87,8 +87,6 @@ struct cpuset {
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cpumask_var_t cpus_allowed; /* CPUs allowed to tasks in cpuset */
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nodemask_t mems_allowed; /* Memory Nodes allowed to tasks */
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struct cpuset *parent; /* my parent */
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struct fmeter fmeter; /* memory_pressure filter */
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/*
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@ -120,6 +118,15 @@ static inline struct cpuset *task_cs(struct task_struct *task)
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struct cpuset, css);
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}
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static inline struct cpuset *parent_cs(const struct cpuset *cs)
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{
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struct cgroup *pcgrp = cs->css.cgroup->parent;
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if (pcgrp)
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return cgroup_cs(pcgrp);
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return NULL;
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}
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#ifdef CONFIG_NUMA
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static inline bool task_has_mempolicy(struct task_struct *task)
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{
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@ -323,7 +330,7 @@ static void guarantee_online_cpus(const struct cpuset *cs,
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struct cpumask *pmask)
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{
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while (cs && !cpumask_intersects(cs->cpus_allowed, cpu_online_mask))
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cs = cs->parent;
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cs = parent_cs(cs);
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if (cs)
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cpumask_and(pmask, cs->cpus_allowed, cpu_online_mask);
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else
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@ -348,7 +355,7 @@ static void guarantee_online_mems(const struct cpuset *cs, nodemask_t *pmask)
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{
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while (cs && !nodes_intersects(cs->mems_allowed,
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node_states[N_MEMORY]))
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cs = cs->parent;
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cs = parent_cs(cs);
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if (cs)
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nodes_and(*pmask, cs->mems_allowed,
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node_states[N_MEMORY]);
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@ -461,7 +468,7 @@ static int validate_change(const struct cpuset *cur, const struct cpuset *trial)
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if (cur == &top_cpuset)
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goto out;
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par = cur->parent;
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par = parent_cs(cur);
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/* We must be a subset of our parent cpuset */
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ret = -EACCES;
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@ -1866,7 +1873,6 @@ static struct cgroup_subsys_state *cpuset_css_alloc(struct cgroup *cont)
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fmeter_init(&cs->fmeter);
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INIT_WORK(&cs->hotplug_work, cpuset_propagate_hotplug_workfn);
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cs->relax_domain_level = -1;
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cs->parent = cgroup_cs(cont->parent);
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return &cs->css;
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}
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@ -1874,7 +1880,7 @@ static struct cgroup_subsys_state *cpuset_css_alloc(struct cgroup *cont)
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static int cpuset_css_online(struct cgroup *cgrp)
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{
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struct cpuset *cs = cgroup_cs(cgrp);
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struct cpuset *parent = cs->parent;
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struct cpuset *parent = parent_cs(cs);
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struct cpuset *tmp_cs;
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struct cgroup *pos_cg;
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@ -2058,10 +2064,10 @@ static void remove_tasks_in_empty_cpuset(struct cpuset *cs)
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* Find its next-highest non-empty parent, (top cpuset
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* has online cpus, so can't be empty).
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*/
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parent = cs->parent;
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parent = parent_cs(cs);
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while (cpumask_empty(parent->cpus_allowed) ||
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nodes_empty(parent->mems_allowed))
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parent = parent->parent;
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parent = parent_cs(parent);
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move_member_tasks_to_cpuset(cs, parent);
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}
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@ -2373,8 +2379,8 @@ int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask)
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*/
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static const struct cpuset *nearest_hardwall_ancestor(const struct cpuset *cs)
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{
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while (!(is_mem_exclusive(cs) || is_mem_hardwall(cs)) && cs->parent)
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cs = cs->parent;
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while (!(is_mem_exclusive(cs) || is_mem_hardwall(cs)) && parent_cs(cs))
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cs = parent_cs(cs);
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return cs;
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}
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