And if you wondered how is this a thing, here's an XFS maintainer with 16GB of RAM explaining it to a Facebook developer running machines with 130GB of RAM and 15 XFS filesystems: https://patchwork.kernel.org/patch/9485751/
It's a fascinating read, you may want to brew some calming tea for it 
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Here's a patch for Linux 4.14 that allows tuning XFS reclaim behavior at runtime, along with reproduction and some graphs from production illustrating this: https://github.com/bobrik/linux/pull/2 …pic.twitter.com/ilnw9C5tAe
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