vm.pmap.pde.demotions: 31
No, your conclusion is incorrect. These counts show that 543 superpage
mappings were created by promotion.
OK, that sounds promising. Does "created by promotion" count reflect
historic / cumulative stats, or is vm.pmap.pde.promotions the actual number
of superpages active? Or should we subtract vm.pmap.pde.demotions from it to
get the current value?
correction to my last answer. something is just wrong IMHO
on my 2GB laptop:
[root@wojtek ~]# sysctl -ad vm.pmap.pde
vm.pmap.pde: 2MB page mapping counters
vm.pmap.pde.promotions: 2MB page promotions
vm.pmap.pde.p_failures: 2MB page promotion failures
vm.pmap.pde.mappings: 2MB page mappings
vm.pmap.pde.demotions: 2MB page demotions
[root@wojtek ~]# sysctl -a vm.pmap.pde
vm.pmap.pde.promotions: 61196
vm.pmap.pde.p_failures: 4796
vm.pmap.pde.mappings: 3051
vm.pmap.pde.demotions: 2306
from description seems like mappings could be current amount , but both
it's value as well as promotions-demotions gives nonsense.
with 2GB RAM there can not be 3051 or more 2MB pages mapped!
and i - at present - doesn't run many large programs actually only some
xterms and one compiling task.
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