函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\frontswap.c Create Date:2022-07-27 16:51:56
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称："Get" data from frontswap associated with swaptype and offset that were* specified when the data was put to frontswap and use it to fill the* specified page with data. Page must be locked and in the swap cache.

函数原型：int __frontswap_load(struct page *page)

返回类型：int

参数：

类型参数名称
struct page *page
296  ret等于负1
297  swp_entry_t entry = {val = page_private(page), }
298  type等于Extract the `type' field from a swp_entry_t. The swp_entry_t is in* arch-independent format
299  sis等于swap_info[type]
300  offset等于Extract the `offset' field from a swp_entry_t. The swp_entry_t is in* arch-independent format
303  VM_BUG_ON(!swap_ops are added by frontswap_register_ops, and provide the* frontswap "backend" implementation functions. Multiple implementations* may be registered, but implementations can never deregister. This)
304  VM_BUG_ON(!PageLocked(page))
305  VM_BUG_ON(sis == NULL)
307  如果非__frontswap_test(sis, offset)则返回:负1
312  ret等于load(type, offset, page)
313  如果非ret则退出
316  如果ret恒等于0则
317  inc_frontswap_loads()
318  如果If enabled, the underlying tmem implementation is capable of doing* exclusive gets, so frontswap_load, on a successful tmem_get must* mark the page as no longer in frontswap AND mark it dirty.则
319  SetPageDirty(page)
320  __frontswap_clear(sis, offset)
323  返回:ret