函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\percpu.c Create Date:2022-07-27 15:50:36
Last Modify:2022-05-23 13:52:24 Copyright©Brick
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函数名称：pcpu_block_update_hint_alloc - update hint on allocation path*@chunk: chunk of interest*@bit_off: chunk offset*@bits: size of request* Updates metadata for the allocation path. The metadata only has to be

函数原型：static void pcpu_block_update_hint_alloc(struct pcpu_chunk *chunk, int bit_off, int bits)

返回类型：void

参数：

类型参数名称
struct pcpu_chunk *chunk
intbit_off
intbits
787  chunk_md等于chunk_md
788  nr_empty_pages等于0
799  s_index等于pcpu_off_to_block_index(bit_off)
800  e_index等于pcpu_off_to_block_index(bit_off + bits - 1)
801  s_off等于pcpu_off_to_block_off(bit_off)
802  e_off等于pcpu_off_to_block_off(bit_off + bits - 1)加1
804  s_block等于 metadata blocks 加s_index
805  e_block等于 metadata blocks 加e_index
813  如果contig hint for block 恒等于PCPU_BITMAP_BLOCK_BITS则nr_empty_pages自加
816  如果s_off恒等于lock position of first free 则lock position of first free 等于在内存区域中查找下一个零位
822  如果pcpu_region_overlap - determines if two regions overlap*@a: start of first region, inclusive*@b: end of first region, exclusive*@x: start of second region, inclusive*@y: end of second region, exclusive* This is used to determine if the hint region [a, b) 则scan hint for block 等于0
828  如果pcpu_region_overlap - determines if two regions overlap*@a: start of first region, inclusive*@b: end of first region, exclusive*@x: start of second region, inclusive*@y: end of second region, exclusive* This is used to determine if the hint region [a, b) 则
834  如果非s_off则size of free space alongthe left side of the block 等于0
836  pcpu_block_refresh_hint*@chunk: chunk of interest*@index: index of the metadata block* Scans over the block beginning at first_free and updates the block* metadata accordingly.
837  否则
839  size of free space alongthe left side of the block 等于两数取小(size of free space alongthe left side of the block , s_off)
840  如果s_index恒等于e_index则size of free space alongthe right side of the block 等于min_t - return minimum of two values, using the specified type*@type: data type to use*@x: first value*@y: second value(int, size of free space alongthe right side of the block , PCPU_BITMAP_BLOCK_BITS - e_off)
843  否则size of free space alongthe right side of the block 等于0
850  如果s_index不等于e_index则
851  如果contig hint for block 恒等于PCPU_BITMAP_BLOCK_BITS则nr_empty_pages自加
858  lock position of first free 等于在内存区域中查找下一个零位
862  如果e_off恒等于PCPU_BITMAP_BLOCK_BITS则
864  e_block自加
865  否则
866  如果e_off大于lock relative startingposition of the scan hint 则scan hint for block 等于0
869  size of free space alongthe left side of the block 等于0
870  如果e_off大于lock relative startingposition of the contig hint 则
873  否则
881  nr_empty_pages加等于e_index减s_index减1
882  以block小于e_block循环
883  scan hint for block 等于0
884  contig hint for block 等于0
885  size of free space alongthe left side of the block 等于0
886  size of free space alongthe right side of the block 等于0
890  如果nr_empty_pages则pcpu_update_empty_pages - update empty page counters*@chunk: chunk of interest*@nr: nr of empty pages* This is used to keep track of the empty pages now based on the premise* a md_block covers a page. The hint update functions recognize if a block
893  如果pcpu_region_overlap - determines if two regions overlap*@a: start of first region, inclusive*@b: end of first region, exclusive*@x: start of second region, inclusive*@y: end of second region, exclusive* This is used to determine if the hint region [a, b) 则scan hint for block 等于0
905  如果pcpu_region_overlap - determines if two regions overlap*@a: start of first region, inclusive*@b: end of first region, exclusive*@x: start of second region, inclusive*@y: end of second region, exclusive* This is used to determine if the hint region [a, b) 则pcpu_chunk_refresh_hint - updates metadata about a chunk*@chunk: chunk of interest*@full_scan: if we should scan from the beginning* Iterates over the metadata blocks to find the largest contig area
调用者
名称描述
pcpu_alloc_areapcpu_alloc_area - allocates an area from a pcpu_chunk*@chunk: chunk of interest*@alloc_bits: size of request in allocation units*@align: alignment of area (max PAGE_SIZE)*@start: bit_off to start searching* This function takes in a @start offset to begin
pcpu_alloc_first_chunkpcpu_alloc_first_chunk - creates chunks that serve the first chunk*@tmp_addr: the start of the region served*@map_size: size of the region served* This is responsible for creating the chunks that serve the first chunk