函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\page_alloc.c Create Date:2022-07-27 16:33:26
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：Freeing function for a buddy system allocator

函数原型：static inline void __free_one_page(struct page *page, unsigned long pfn, struct zone *zone, unsigned int order, int migratetype)

返回类型：void

参数：

类型参数名称
struct page *page
unsigned longpfn
struct zone *zone
unsigned intorder
intmigratetype
903  buddy_pfn等于buddy_pfn
906  capc等于task_capc(zone)
908  max_order等于min_t - return minimum of two values, using the specified type*@type: data type to use*@x: first value*@y: second value(unsignedint, Free memory management - zoned buddy allocator. , Huge pages are a constant size + 1)
910  VM_BUG_ON(!zone_is_initialized(zone))
911  VM_BUG_ON_PAGE(体系结构无关页的属性 & Flags checked when a page is prepped for return by the page allocator, page)
913  VM_BUG_ON(migratetype == - 1)
914  如果此条件成立可能性大(为编译器优化)(!is_migrate_isolate(migratetype))则__mod_zone_freepage_state(zone, 1 << order, migratetype)
917  VM_BUG_ON_PAGE(pfn & ((1 << order) - 1), page)
918  VM_BUG_ON_PAGE(bad_range(zone, page), page)
920  continue_merging :
921  当order小于max_order减1循环
922  如果compaction_capture(capc, page, order, migratetype)则
923  __mod_zone_freepage_state(zone, - (1 << order), migratetype)
925  返回
927  buddy_pfn等于Locate the struct page for both the matching buddy in our* pair (buddy1) and the combined O(n+1) page they form (page)
928  buddy等于page加buddy_pfn减pfn
930  如果非pfn_valid_within(buddy_pfn)则转到:done_merging
932  如果非This function checks whether a page is free && is the buddy* we can coalesce a page and its buddy if* (a) the buddy is not in a hole (check before calling!) &&* (b) the buddy is in the buddy system &&* (c) a page and its buddy have the same order &&则转到:done_merging
938  如果page_is_guard(buddy)则clear_page_guard(zone, buddy, order, migratetype)
940  否则del_page_from_free_area(buddy, & 伙伴系统空闲内存页[order])
942  combined_pfn等于buddy_pfn按位与pfn
943  page等于page加combined_pfn减pfn
944  pfn等于combined_pfn
945  order自加
947  如果max_order小于Free memory management - zoned buddy allocator. 则
956  如果此条件成立可能性小(为编译器优化)(has_isolate_pageblock(zone))则
959  buddy_pfn等于Locate the struct page for both the matching buddy in our* pair (buddy1) and the combined O(n+1) page they form (page)
960  buddy等于page加buddy_pfn减pfn
961  buddy_mt等于get_pageblock_migratetype(buddy)
963  如果migratetype不等于buddy_mt且is_migrate_isolate(migratetype)或is_migrate_isolate(buddy_mt)的值则转到:done_merging
968  max_order自加
969  转到:continue_merging
972  done_merging :
973  set_page_order(page, order)
983  如果order小于Free memory management - zoned buddy allocator. 减2且pfn_valid_within(buddy_pfn)且非is_shuffle_order(order)则
986  combined_pfn等于buddy_pfn按位与pfn
987  higher_page等于page加combined_pfn减pfn
988  buddy_pfn等于Locate the struct page for both the matching buddy in our* pair (buddy1) and the combined O(n+1) page they form (page)
989  higher_buddy等于higher_page加buddy_pfn减combined_pfn
990  如果pfn_valid_within(buddy_pfn)且This function checks whether a page is free && is the buddy* we can coalesce a page and its buddy if* (a) the buddy is not in a hole (check before calling!) &&* (b) the buddy is in the buddy system &&* (c) a page and its buddy have the same order &&则
992  Used for pages not on another list
994  返回
998  如果is_shuffle_order(order)则add_to_free_area_random(page, & 伙伴系统空闲内存页[order], migratetype)
1001  否则Used for pages not on another list
调用者
名称描述
free_pcppages_bulkFrees a number of pages from the PCP lists* Assumes all pages on list are in same zone, and of same order.* count is the number of pages to free.* If the zone was previously in an "all pages pinned" state then look to
free_one_page