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This patch introduces a shrinker that will remove THPs in the lowest utilization bucket. As previously mentioned, we have observed that almost all of the memory waste when THPs are always enabled is contained in the lowest utilization bucket. The shrinker will add these THPs to a list_lru and split anonymous THPs based off information from kswapd. It requires the changes from thp_utilization to identify the least utilized THPs, and the changes to split_huge_page to identify and free zero pages within THPs. Signed-off-by: Alexander Zhu <alexlzhu@fb.com>
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