Any method to limit page cache usage in test cases?

[Qu Wenruo <quwenruo.btrfs@xxxxxxx>]

Hi,

Is there any (easy) method for a fstests test case to limit the page
cache usage?

I triggered btrfs/139 failure with 2G vRAM VM, and located the root
cause of the problem.

However it's only really reproducible for small ram VM, since it could
trigger dirty page writeback due to memory pressure.

So I'm wondering if we could do such thing even for large RAM test machine.

Thanks,
Qu

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