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a bug with memory page allocation
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#I4UUHU
nniegl
Opened this issue
2022-02-23 09:47
**Bug**: 在``code/os/02-memanagement/page.c``中，函数``void *page_alloc(int npages)``的最外层循环的循环判断条件（源代码的113行）应改为``i <= (_num_pages - npages)``，否则会造成可分配的页数比实际可分配页数少一。  **重现**： 利用**void page_test()**，进行测试。考虑极端情况：先分配1页，然后再分配_num_pages-1页。 运行结果： - 循环条件 i <= (_num_pages - npages)：第1页和后_num_pages-1页都正常分配 - 循环条件 i < (_num_pages - npages)：第1页正常分配，后_num_pages-1页无法分配  
**Bug**: 在``code/os/02-memanagement/page.c``中，函数``void *page_alloc(int npages)``的最外层循环的循环判断条件（源代码的113行）应改为``i <= (_num_pages - npages)``，否则会造成可分配的页数比实际可分配页数少一。  **重现**： 利用**void page_test()**，进行测试。考虑极端情况：先分配1页，然后再分配_num_pages-1页。 运行结果： - 循环条件 i <= (_num_pages - npages)：第1页和后_num_pages-1页都正常分配 - 循环条件 i < (_num_pages - npages)：第1页正常分配，后_num_pages-1页无法分配  
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