函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\swapfile.c Create Date:2022-07-27 16:46:51
Last Modify:2020-03-17 22:19:49 Copyright©Brick
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函数名称：Determine the locking method in use for this device. Return* swap_cluster_info if SSD-style cluster-based locking is in place.

函数原型：static inline struct swap_cluster_info *lock_cluster_or_swap_info(struct swap_info_struct *si, unsigned long offset)

返回类型：struct swap_cluster_info

参数：

类型参数名称
struct swap_info_struct *si
unsigned longoffset
367  ci等于lock_cluster(si, offset)
369  如果非ci则加自旋锁
372  返回:ci
调用者
名称描述
__swap_entry_free
put_swap_pageCalled after dropping swapcache to decrease refcnt to swap entries.
page_swapcountHow many references to page are currently swapped out?* This does not give an exact answer when swap count is continued,* but does include the high COUNT_CONTINUED flag to allow for that.
swap_swapcount
swp_swapcountHow many references to @entry are currently swapped out?* This considers COUNT_CONTINUED so it returns exact answer.
swap_page_trans_huge_swapped
__swap_duplicateVerify that a swap entry is valid and increment its swap map count.* Returns error code in following case.* - success -> 0* - swp_entry is invalid -> EINVAL* - swp_entry is migration entry -> EINVAL