hugetlb_cgroup_charge_cgroup

Name:hugetlb_cgroup_charge_cgroup

Proto:int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages, struct hugetlb_cgroup **ptr)

Type:int

Parameter:

Type	Parameter	Name
int	idx
unsigned long	nr_pages
struct hugetlb_cgroup **	ptr

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ret = 0

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struct hugetlb_cgroup * h_cg = NULL

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If hugetlb_cgroup_disabled() Then Go to done

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If huge_page_order( & hstates[idx]) < Minimum page order trackable by hugetlb cgroup.* At least 3 pages are necessary for all the tracking information. Then Go to done

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again :

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_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

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h_cg = hugetlb_cgroup_from_task(current process)

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If Not ss_tryget - try to obtain a reference on the specified css*@css: target css* Obtain a reference on @css unless it already has reached zero and is* being released. This function doesn't care whether @css is on or* offline Then

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_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()

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Go to again

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_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()

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If Not page_counter_try_charge - try to hierarchically charge pages*@counter: counter*@nr_pages: number of pages to charge*@fail: points first counter to hit its limit, if any* Returns %true on success, or %false and @fail if the counter or one Then ret = -ENOMEM

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ss_put - put a css reference*@css: target css* Put a reference obtained via css_get() and css_tryget_online().

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done :

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ptr = h_cg

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Return ret

**Caller**
Name	Describe
alloc_huge_page

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