Re: [RFC PATCH 13/19] x86/resctrl: Add PLZA state tracking and context switch handling

[Luck, Tony]

> Likely real implementation:
> 
> Sub-components of each of the ideas above are encoded as a bitmask that
> is written to plza_mode. There is a file in the info/ directory listing
> which bits are supported on the current system (e.g. the "keep the same
> RMID" mode may be impractical on ARM, so it would not be listed as an
> option.)


In x86 terms where control and monitor functions are independent we
have:

Control:
1) Use default (CLOSID==0) for kernel
2) Allocate just one CLOSID for kernel
3) Allocate many CLOSIDs for kernel

Monitor:
1) Do not monitor kernel separately from user
2) Use default (RMID==0) for kernel
3) Allocate one RMID for kernel
4) Allocate many RMIDs for kernel

What options are possible on ARM & RISC-V?

-Tony