** Description changed:
On bionic kernel with btrfs mounted, kernfs_node_cache grows constantly.
About 7MB/hour of unreclaimable memory growth was observed on my x86_64
system with btrfs root partition, kernel 4.15.0-48-generic #51-Ubuntu
SMP Wed Apr 3 08:28:49 UTC 2019 x86_64 x86_64 x8
Commit 55237a5f has already been applied in Bionic kernel,
https://kernel.ubuntu.com/git/ubuntu/ubuntu-bionic.git/commit/?id=02f4976643b29ebe7d93e79cd468cd41442af560
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