Re: [TESTCASE] Clean pages clogging the VM

[Wu Fengguang]

> Mapped file pages get two rounds on the LRU list, so once the VM
> starts scanning, it has to go through all of them twice and can only
> reclaim them on the second encounter.

This can be fixed gracefully based on Rik's refault-distance patch :)
With the distance info we can safely drop the use-once mapped file pages.

Thanks,
Fengguang
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