[PATCH v3 07/20] arm64: mm: Allocate ASIDs in pairs

[FF]

At 2018-01-16 10:24:42, "FF" <figure1802 at 126.com> wrote:
>hi all:
>why we use two  ASID for a process? what is the benefits?
>After KPTI, the kernel space mapping become non-Global TLB (process-specific TLB)? so we need one ASID for  process running in userspace?
>and other ASID for process running in kernel space? it will switch the ASID when a process  switching to/form userpsace?
>
>
>what is the benefits add exception trampoline page? it will performance regression?
>

anyone can help to confirm?

Thanks,
FF