Correction - after using 4.14.53 for a while, I do actually see
list_lru_count_one at the top, but only at ~10% overhead. The
responsiveness is slightly degraded, but still better than how it was on
4.18-rc4.

On 07/22/2018 08:02 PM, Kevin Liu wrote:
> 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
> 
>