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cgroup: reimplement cgroup_transfer_tasks() without using css_scan_tasks()
Reimplement cgroup_transfer_tasks() so that it repeatedly fetches the first task in the cgroup and then tranfers it. This achieves the same result without using css_scan_tasks() which is scheduled to be removed. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Li Zefan <lizefan@huawei.com>
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parent
07bc356ed2
commit
e406d1cfff
1 changed files with 20 additions and 11 deletions
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@ -2850,15 +2850,6 @@ int css_scan_tasks(struct cgroup_subsys_state *css,
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return 0;
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}
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static void cgroup_transfer_one_task(struct task_struct *task, void *data)
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{
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struct cgroup *new_cgroup = data;
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mutex_lock(&cgroup_mutex);
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cgroup_attach_task(new_cgroup, task, false);
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mutex_unlock(&cgroup_mutex);
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}
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/**
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* cgroup_trasnsfer_tasks - move tasks from one cgroup to another
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* @to: cgroup to which the tasks will be moved
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@ -2866,8 +2857,26 @@ static void cgroup_transfer_one_task(struct task_struct *task, void *data)
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*/
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int cgroup_transfer_tasks(struct cgroup *to, struct cgroup *from)
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{
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return css_scan_tasks(&from->dummy_css, NULL, cgroup_transfer_one_task,
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to, NULL);
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struct css_task_iter it;
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struct task_struct *task;
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int ret = 0;
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do {
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css_task_iter_start(&from->dummy_css, &it);
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task = css_task_iter_next(&it);
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if (task)
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get_task_struct(task);
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css_task_iter_end(&it);
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if (task) {
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mutex_lock(&cgroup_mutex);
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ret = cgroup_attach_task(to, task, false);
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mutex_unlock(&cgroup_mutex);
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put_task_struct(task);
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}
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} while (task && !ret);
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return ret;
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}
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/*
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