[next-6.6]Hygon：Fixed bugs related to THP allocation and memory page migration · Pull Request !154 · OpenCloudOS/OpenCloudOS-Kernel

Fix for THP allocation
1. patches
 **mm/page_alloc: don't use PCP list for THP-sized allocations when using PF_MEMALLOC_PIN** 
2. description
In the past, movable allocations could be disallowed from CMA through PF_MEMALLOC_PIN. However, since 5d0a661d808f ("mm/page_alloc: use only one PCP list for THP-sized allocations"), THP-sized pages of different types are put into one PCP list. When allocate a THP with PF_MEMALLOC_PIN, it would accidentally get a CMA page from PCP list, which will cause the program to not run correctly. So, PCP list can't be used for THP-sized allocations when using PF_MEMALLOC_PIN.

Fix for page migration
1. patches
 **mm/gup: don't check if a page is in lru before draining it** 
2. description
Before migrating a page, we need to drain the page out of cpu's pagevecs if the page is in cpu's pagevecs. Otherwise, the migration will fail because of incorrect page reference. Whatever the return value of the function folio_test_lru() is, it does not tell whether the page is in cpu's pagevecs. Therefore, the check folio_test_lru() needs to be removed to ensure that the migration logic is correct.

类型	指派人员	状态
审查	chinaljp030 刘诗	已完成 (0/0人)
测试	chinaljp030 刘诗	已完成 (0/0人)

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