[PATCH v4 02/48] mm: vmscan: move shrinker-related code into a separate file

[Muchun Song]

> On Aug 7, 2023, at 19:08, Qi Zheng <zhengqi.arch at bytedance.com> wrote:
> 
> The mm/vmscan.c file is too large, so separate the shrinker-related
> code from it into a separate file. No functional changes.
> 
> Signed-off-by: Qi Zheng <zhengqi.arch at bytedance.com>

Reviewed-by: Muchun Song <songmuchun at bytedance.com>