cgroup_update_frozen

Name:Revisit the cgroup frozen state.* Checks if the cgroup is really frozen and perform all state transitions.

Proto:void cgroup_update_frozen(struct cgroup *cgrp)

Type:void

Parameter:

Type	Parameter	Name
struct cgroup *	cgrp

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lockdep_assert_held( & css_set_lock)

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frozen = st_bit - Determine whether a bit is set*@nr: bit number to test*@addr: Address to start counting from && * Number of tasks, which are counted as frozen: * frozen, SIGSTOPped, and PTRACEd. == __cgroup_task_count - count the number of tasks in a cgroup. The caller* is responsible for taking the css_set_lock.*@cgrp: the cgroup in question

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If frozen Then

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If st_bit - Determine whether a bit is set*@nr: bit number to test*@addr: Address to start counting from Then Return

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Atomically set a bit in memory

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Else

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If Not st_bit - Determine whether a bit is set*@nr: bit number to test*@addr: Address to start counting from Then Return

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lear_bit - Clears a bit in memory*@nr: Bit to clear*@addr: Address to start counting from* This is a relaxed atomic operation (no implied memory barriers).

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group_file_notify - generate a file modified event for a cgroup_file*@cfile: target cgroup_file*@cfile must have been obtained by setting cftype->file_offset.

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cgroup_path() takes a spin lock(notify_frozen, cgrp, frozen)

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Propagate the cgroup frozen state upwards by the cgroup tree.

**Caller**
Name	Describe
cgroup_enter_frozen	Enter frozen/stopped state, if not yet there. Update cgroup's counters,* and revisit the state of the cgroup, if necessary.
cgroup_leave_frozen	Conditionally leave frozen/stopped state
cgroup_do_freeze	Freeze or unfreeze all tasks in the given cgroup.
cgroup_freezer_migrate_task	Adjust the task state (freeze or unfreeze) and revisit the state of* source and destination cgroups.
cgroup_exit	group_exit - detach cgroup from exiting task@tsk: pointer to task_struct of exiting process Description: Detach cgroup from @tsk.

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