Linux Source Learning (7) 2013-3-1

Linux Source Learning (7) 2013-3-1

• Space

Memory Management MEMORY.C

Mainly used for memory paging management. Enables dynamic allocation and recycling of main memory pages

Linux manages all of the physical pages through a single byte array. Each byte is used to indicate the number of times its corresponding physical page is occupied

1. Invalidate macro: Refreshes the page table data cached by the CPU by re-assigning the CR3 to the hosted method. For page table related property changes

2. Code_space (addr) macro: Determine if addr is in the code snippet of the current process

3. Copy_page (FROM,TO) macro: Copy a page of memory

4. unsigned long get_free_page (void) function: Gets a free physical page that returns the physical page start address

5. Void Free_page (unsigned long addr) function: Releasing a physical page

6. int free_page_tables (unsigned long from,unsigned long size) function: Releases the memory of the size page table sizes corresponding to the linear address from. One page table corresponds to 4 m of memory

7. int copy_page_table (unsigned long from,unsigned to, long size) function: Copies the page catalog table entries and page table entries that specify the linear address and length. Size is byte

Collected in 2013-03-01 from the Baidu space article has a problem? Click here to give us feedback

Linux Source Learning (7) 2013-3-1