函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\huge_memory.c Create Date:2022-07-27 17:37:09
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：__split_huge_page

函数原型：static void __split_huge_page(struct page *page, struct list_head *list, unsigned long end, unsigned long flags)

返回类型：void

参数：

类型参数名称
struct page *page
struct list_head *list
unsigned longend
unsigned longflags
2502  head等于compound_head(page)
2503  pgdat等于page_pgdat(head)
2505  struct address_space * swap_cache = NULL
2506  offset等于0
2509  lruvec等于mem_cgroup_page_lruvec(head, pgdat)
2512  mem_cgroup_split_huge_fixup(head)
2514  如果PageAnon(head)且PageSwapCache(head)则
2515  swp_entry_t entry = {val = page_private(head)}
2517  offset等于Extract the `offset' field from a swp_entry_t. The swp_entry_t is in* arch-independent format
2518  swap_cache等于swap_address_space(entry)
2519  xa_lock( & i_pages)
2522  以i大于等于1循环
2523  __split_huge_page_tail(head, i, lruvec, list)
2525  如果 Our offset within mapping. 大于等于end则
2526  ClearPageDirty(head + i)
2527  Delete a page from the page cache and free it. Caller has to make* sure the page is locked and that nobody else uses it - or that usage* is safe. The caller must hold the i_pages lock.
2528  如果IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm',* 0 otherwise.(CONFIG_SHMEM)且PageSwapBacked(head)则shmem_uncharge(host, 1)
2530  Perform a free_page(), also freeing any swap cache associated with* this page if it is the last user of the page.
2531  否则如果非PageAnon(page)则
2532  __xa_store() - Store this entry in the XArray
2534  否则如果swap_cache则
2535  __xa_store() - Store this entry in the XArray
2540  ClearPageCompound(head)
2542  split_page_owner(head, HPAGE_PMD_ORDER)
2545  如果PageAnon(head)则
2547  如果PageSwapCache(head)则
2548  page_ref_add(head, 2)
2549  xa_unlock( & i_pages)
2550  否则
2551  page_ref_inc(head)
2553  否则
2555  page_ref_add(head, 2)
2556  xa_unlock( & i_pages)
2559  spin_unlock_irqrestore( & Write-intensive fields used by page reclaim , flags)
2561  remap_page(head)
2563  以i小于HPAGE_PMD_NR循环
2564  subpage等于head加i
2565  如果subpage恒等于page则继续下一循环
2567  lock_page - unlock a locked page*@page: the page* Unlocks the page and wakes up sleepers in ___wait_on_page_locked().* Also wakes sleepers in wait_on_page_writeback() because the wakeup* mechanism between PageLocked pages and PageWriteback pages is shared.
2576  Perform a free_page(), also freeing any swap cache associated with* this page if it is the last user of the page.
调用者
名称描述
split_huge_page_to_listThis function splits huge page into normal pages. @page can point to any* subpage of huge page to split. Split doesn't change the position of @page.* Only caller must hold pin on the @page, otherwise split fails with -EBUSY.* The huge page must be locked.