Comment by sltkr
> The pauses occur even [..] if you call mlock
I wonder how this is even possible. The only scenario I can think of involves a page fault on the page table itself (i.e., the page is locked into memory, but a page fault occurs during virtual-to-physical address translation). Does anyone know the real reason?
Probably because pages mapped, even if they are locked into memory are not allowed to stay dirty forever. Does this help? https://stackoverflow.com/a/11024388 (In contrast, if you mlocked but never wrote to the pages, you probably would not encounter read pauses)