unset_migratetype_isolate

Name:unset_migratetype_isolate

Proto:static void unset_migratetype_isolate(struct page *page, unsigned migratetype)

Type:void

Parameter:

Type	Parameter	Name
struct page *	page
unsigned	migratetype

94

bool isolated_page = false

99

zone = page_zone(page)

100

spin_lock_irqsave( & Primarily protects free_area , flags)

101

If Not is_migrate_isolate_page(page) Then Go to out

112

If PageBuddy() indicates that the page is free and in the buddy system* (see mm/page_alloc.c). Then

113

order = page_order(page)

114

If order >= Huge pages are a constant size Then

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pfn = page_to_pfn(page)

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buddy_pfn = Locate the struct page for both the matching buddy in our* pair (buddy1) and the combined O(n+1) page they form (page)

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buddy = page + buddy_pfn - pfn

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If pfn_valid_within(buddy_pfn) && Not is_migrate_isolate_page(buddy) Then

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__isolate_free_page(page, order)

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isolated_page = true

132

If Not isolated_page Then

133

nr_pages = move_freepages_block(zone, page, migratetype, NULL)

134

__mod_zone_freepage_state(zone, nr_pages, migratetype)

136

set_pageblock_migratetype(page, migratetype)

137

* Number of isolated pageblock. It is used to solve incorrect * freepage counting problem due to racy retrieving migratetype * of pageblock. Protected by zone->lock.--

138

out :

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spin_unlock_irqrestore( & Primarily protects free_area , flags)

140

If isolated_page Then

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post_alloc_hook(page, order, ZONE_MOVABLE allowed )

142

__free_pages(page, order)

**Caller**
Name	Describe
start_isolate_page_range	start_isolate_page_range() - make page-allocation-type of range of pages to* be MIGRATE_ISOLATE.@start_pfn: The lower PFN of the range to be isolated.@end_pfn: The upper PFN of the range to be isolated.
undo_isolate_page_range	Make isolated pages available again.

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