mem_cgroup_get_oom_group

Name:mem_cgroup_get_oom_group - get a memory cgroup to clean up after OOM*@victim: task to be killed by the OOM killer*@oom_domain: memcg in case of memcg OOM, NULL in case of system-wide OOM* Returns a pointer to a memory cgroup, which has to be cleaned up

Proto:struct mem_cgroup *mem_cgroup_get_oom_group(struct task_struct *victim, struct mem_cgroup *oom_domain)

Type:struct mem_cgroup

Parameter:

Type	Parameter	Name
struct task_struct *	victim
struct mem_cgroup *	oom_domain

1904

struct mem_cgroup * oom_group = NULL

1907

If Not cgroup_subsys_on_dfl - fast test on whether a subsys is on default hierarchy*@ss: subsystem in question(memory_cgrp_subsys) Then Return NULL

1910

If Not oom_domain Then oom_domain = root_mem_cgroup

1913

_read_lock() - mark the beginning of an RCU read-side critical section* When synchronize_rcu() is invoked on one CPU while other CPUs* are within RCU read-side critical sections, then the* synchronize_rcu() is guaranteed to block until after all the other

1915

memcg = mem_cgroup_from_task(victim)

1916

If memcg == root_mem_cgroup Then Go to out

1924

When memcg cycle

1925

If * Should the OOM killer kill all belonging tasks, had it kill one? Then oom_group = memcg

1928

If memcg == oom_domain Then Break

1932

If oom_group Then ss_get - obtain a reference on the specified css*@css: target css* The caller must already have a reference.

1934

out :

1935

_read_unlock() - marks the end of an RCU read-side critical section.* In most situations, rcu_read_unlock() is immune from deadlock.* However, in kernels built with CONFIG_RCU_BOOST, rcu_read_unlock()

1937

Return oom_group

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