函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\zbud.c Create Date:2022-07-27 18:00:51
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：zbud_reclaim_page() - evicts allocations from a pool page and frees it*@pool: pool from which a page will attempt to be evicted*@retries: number of pages on the LRU list for which eviction will* be attempted before failing* zbud reclaim is different from

函数原型：int zbud_reclaim_page(struct zbud_pool *pool, unsigned int retries)

返回类型：int

参数：

类型参数名称
struct zbud_pool *pool
unsigned intretries
506  first_handle等于0, last_handle等于0
508  加自旋锁
509  如果非ops或非evict或链表为空或retries恒等于0则
511  自旋锁解锁
512  返回:负EINVAL
514  以i小于retries循环
515  zhdr等于list_last_entry - get the last element from a list*@ptr: the list head to take the element from.*@type: the type of the struct this is embedded in.*@member: the name of the list_head within the struct.* Note, that list is expected to be not empty.( & lru, structzbud_header, lru)
516  删除链表项
517  删除链表项
519  under_reclaim = true
524  first_handle等于0
525  last_handle等于0
526  如果first_chunks则first_handle等于Encodes the handle of a particular buddy within a zbud page* Pool lock should be held as this function accesses first|last_chunks
528  如果last_chunks则last_handle等于Encodes the handle of a particular buddy within a zbud page* Pool lock should be held as this function accesses first|last_chunks
530  自旋锁解锁
533  如果first_handle则
534  ret等于evict(pool, first_handle)
535  如果ret则转到:next
538  如果last_handle则
539  ret等于evict(pool, last_handle)
540  如果ret则转到:next
543  :
544  加自旋锁
545  under_reclaim = false
546  如果first_chunks恒等于0且last_chunks恒等于0则
551  Resets the struct page fields and frees the page
552  pages_nr自减
553  自旋锁解锁
554  返回:0
555  否则如果first_chunks恒等于0或last_chunks恒等于0则
558  freechunks等于Returns the number of free chunks in a zbud page
559  添加链表项
560  否则
562  添加链表项
566  添加链表项
568  自旋锁解锁
569  返回:负EAGAIN
调用者
名称描述
zbud_zpool_shrink