23 Feb
2022
23 Feb
'22
4:44 p.m.
Baolin Wang <baolin.wang(a)linux.alibaba.com> writes:
( 2/23/2022 3:51 PM, Huang, Ying S:
Then how about adding a counter for unmapped pages accesses we checked?
And I think these kind of counters are for debugging only at least for
now. Should we merge them formally?
Do you have an example about how to use this new counter or similar one?
Best Regards,
Huang, Ying
Baolin Wang <baolin.wang(a)linux.alibaba.com>
writes:
They are not same. Since numa_hint_faults will not contain file page
promotion statistics, while the should_numa_migrate_memory() will
check the file pages latency before promotion. Here some statistics I
observed:
pgpromote_candidate 3890100
pgpromote_cold_throttle 50342001
numa_hint_faults 35341839 ANBZ: #80
Add page promotion throttle statistic, which can be used to check
how many cold pages were trying to be prmoted to DRAM, and help
to tuning the latency threhold.
Can this be calculated via the following formula?
numa_hint_faults - pgpromote_candidate