Verified on bionic with test case from description:
# uname -r
4.15.0-67-generic
Write performance dropped from ~150MB/s to ~147MB/s, and the system is
still responsive.
** Tags removed: verification-needed-bionic
** Tags added: verification-done-bionic
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https://bugs.launchpad.net/bugs/1840043
Title:
bcache: Performance degradation when querying priority_stats
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