propagate_protected_usage

Name:propagate_protected_usage

Proto:static void propagate_protected_usage(struct page_counter *c, unsigned long usage)

Type:void

Parameter:

Type	Parameter	Name
struct page_counter *	c
unsigned long	usage

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If Not parent Then Return

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If min || atomic_long_read( & min_usage) Then

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If usage <= min Then protected = usage

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Else protected = 0

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old_protected = atomic_long_xchg( & min_usage, protected)

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delta = protected - old_protected

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If delta Then atomic_long_add(delta, & children_min_usage)

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If low || atomic_long_read( & low_usage) Then

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If usage <= low Then protected = usage

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Else protected = 0

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old_protected = atomic_long_xchg( & low_usage, protected)

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delta = protected - old_protected

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If delta Then atomic_long_add(delta, & children_low_usage)

**Caller**
Name	Describe
page_counter_cancel	page_counter_cancel - take pages out of the local counter@counter: counter@nr_pages: number of pages to cancel
page_counter_charge	page_counter_charge - hierarchically charge pages@counter: counter@nr_pages: number of pages to charge* NOTE: This does not consider any configured counter limits.
page_counter_try_charge	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
page_counter_set_min	page_counter_set_min - set the amount of protected memory@counter: counter@nr_pages: value to set* The caller must serialize invocations on the same counter.
page_counter_set_low	page_counter_set_low - set the amount of protected memory@counter: counter@nr_pages: value to set* The caller must serialize invocations on the same counter.

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