cgroup_propagate_frozen

Name:Propagate the cgroup frozen state upwards by the cgroup tree.

Proto:static void cgroup_propagate_frozen(struct cgroup *cgrp, bool frozen)

Type:void

Parameter:

Type	Parameter	Name
struct cgroup *	cgrp
bool	frozen

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desc = 1

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When cgrp = cgroup_parent(cgrp) cycle

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If frozen Then

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Number of frozen descendant cgroups += desc

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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 && st_bit - Determine whether a bit is set*@nr: bit number to test*@addr: Address to start counting from && Number of frozen descendant cgroups == * Keep track of total numbers of visible and dying descent cgroups. * Dying cgroups are cgroups which were deleted by a user, * but are still existing because someone else is holding a reference. * max_descendants is a maximum allowed number of descent cgr Then

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Atomically set a bit in memory

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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, 1)

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desc++

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Else

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Number of frozen descendant cgroups -= desc

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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

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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, 0)

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desc++

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

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