pcpu_alloc

函数名称：pcpu_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

函数原型：static int pcpu_alloc_area(struct pcpu_chunk *chunk, int alloc_bits, size_t align, int start)

返回类型：int

参数：

类型	参数	名称
struct pcpu_chunk *	chunk
int	alloc_bits
size_t	align
int	start

1189

chunk_md等于chunk_md

1190

align_mask等于如果align则align减1否则0

1191

area_off等于0, area_bits等于0

1194

lockdep_assert_held( & pcpu_lock)

1196

oslot等于pcpu_chunk_slot(chunk)

1201

end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, start + alloc_bits + PCPU_BITMAP_BLOCK_BITS, pcpu_chunk_map_bits - helper to convert nr_pages to size of bitmap*@chunk: chunk of interest* This conversion is from the number of physical pages that the chunk* serves to the number of bits in the bitmap.)

1203

bit_off等于pcpu_find_zero_area - modified from bitmap_find_next_zero_area_off()*@map: the address to base the search on*@size: the bitmap size in bits*@start: the bitnumber to start searching at*@nr: the number of zeroed bits we're looking for*@align_mask: alignment

1205

如果bit_off大于等于end则返回:负1

1208

如果area_bits则pcpu_block_update_scan - update a block given a free area from a scan*@chunk: chunk of interest*@bit_off: chunk offset*@bits: size of free area* Finding the final allocation spot first goes through pcpu_find_block_fit()* to find a block that can hold the

1212

bitmap_set( allocation map , bit_off, alloc_bits)

1215

设置内存位

1216

bitmap_clear( boundary map , bit_off + 1, alloc_bits - 1)

1217

设置内存位

1219

free bytes in the chunk 减等于alloc_bits乘PCPU_MIN_ALLOC_SIZE

1222

如果bit_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

1228

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

1230

pcpu_chunk_relocate - put chunk in the appropriate chunk slot*@chunk: chunk of interest*@oslot: the previous slot it was on* This function is called after an allocation or free changed @chunk

1232

返回:bit_off乘PCPU_MIN_ALLOC_SIZE

**调用者**
名称	描述
pcpu_alloc	pcpu_alloc - the percpu allocator@size: size of area to allocate in bytes@align: alignment of area (max PAGE_SIZE)@reserved: allocate from the reserved chunk if available@gfp: allocation flags* Allocate percpu area of @size bytes aligned at @align

源代码转换工具开放的插件接口	X
支持：c/c++/esqlc/java Oracle/Informix/Mysql 插件可实现：逻辑报告代码生成和批量转换代码

函数逻辑报告