[5.10] [Feature] mm: backport mglru with corresponding patches and fix conflictions with kidled · Pull Request !2051 · anolis/cloud-kernel

bugzilla: https://bugzilla.openanolis.cn/show_bug.cgi?id=6082

Multi-Gen LRU is an efficient page reclaiming method, which introduced
in upstream v5.19. It innovatively proposes multiple LRUs to better
characterize the hotness of pages, and it optimizes page table walks
and page unmapping. For some scenarios that can be reclaimed
proactively, it provides an interface for memory reclamation.

Most conflictions of this patchset are about folio to page. Other
conflictions including:
 - kidled page flags in flag-layout
 - min_cache_kbytes in shrink_node()

Performance results:
kswapd with mglru
  17.67%  kswapd0  [kernel.vmlinux]  [k] scan_swap_map_slots
  14.81%  kswapd0  [kernel.vmlinux]  [k] ptep_clear_flush
   9.07%  kswapd0  [kernel.vmlinux]  [k] shrink_inactive_list
   6.77%  kswapd0  [kernel.vmlinux]  [k] page_vma_mapped_walk
   6.11%  kswapd0  [kernel.vmlinux]  [k] __remove_mapping

kswapd without mglru
  25.37%  kswapd0  [kernel.vmlinux]  [k] scan_swap_map_slots
  12.36%  kswapd0  [kernel.vmlinux]  [k] ptep_clear_flush
  11.58%  kswapd0  [kernel.vmlinux]  [k] evict_pages
   5.90%  kswapd0  [kernel.vmlinux]  [k] get_page_pfns
   5.39%  kswapd0  [kernel.vmlinux]  [k] __remove_mapping

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