On 09/02/2016 04:39 AM, Juerg Haefliger wrote: > Allocating a page to userspace that was previously allocated to the > kernel requires an expensive TLB shootdown. To minimize this, we only > put non-kernel pages into the hot cache to favor their allocation.
But kernel allocations do allocate from these pools, right? Does this just mean that kernel allocations usually have to pay the penalty to convert a page? So, what's the logic here? You're assuming that order-0 kernel allocations are more rare than allocations for userspace?
