Sorry, not sure if the previous message registered on bugzilla due to
the pgp signature? Including it below.

On 07/22/2018 07:44 PM, Kevin Liu wrote:
>> How recently?  Were earlier kernels better behaved?
> I've seen this issue both on Linux 4.16.15 (admittedly using the -ck
> patchset) and on vanilla Linux 4.18-rc4 (which is what I'm currently using).
> 
> I'm fairly certain that it did not occur on Linux 4.14.50, which I used
> previously, but I will boot back into it to double-check and let you know.
> 

And yes, booted back into Linux 4.14.54, there appears to be no issue --
list_lru_count_one reaches 6% overhead at most:

Overhead  Shared Object                     Symbol

   5.91%  [kernel]                          [k] list_lru_count_one

   5.13%  [kernel]                          [k] nmi

   4.08%  [kernel]                          [k] read_hpet

   1.26%  zma                               [.] Zone::CheckAlarms

   1.16%  [kernel]                          [k] _raw_spin_lock

   1.07%  restic                            [.] 0x00000000002e696c

   1.06%  .perf-wrapped                     [.] hpp__sort_overhead