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_one5.13% [kernel] [k] nmi4.08% [kernel] [k] read_hpet1.26% zma [.] Zone::CheckAlarms1.16% [kernel] [k] _raw_spin_lock1.07% restic [.] 0x00000000002e696c1.06% .perf-wrapped [.] hpp__sort_overhead
