Re: [PATCH v11 4/9] x86: detect and initialize Platform QoS Monitoring feature

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Fri, Jun 20, 2014 at 10:31:45PM +0800, Dongxiao Xu wrote:
> Detect platform QoS feature status and enumerate the resource types,
> one of which is to monitor the L3 cache occupancy.
> 
> Also introduce a Xen grub command line parameter to control the
> QoS feature status.
> 
> Signed-off-by: Dongxiao Xu <dongxiao.xu@intel.com>
> ---
>  docs/misc/xen-command-line.markdown |   7 +++
>  xen/arch/x86/Makefile               |   1 +
>  xen/arch/x86/pqos.c                 | 122 ++++++++++++++++++++++++++++++++++++
>  xen/arch/x86/setup.c                |   3 +
>  xen/include/asm-x86/cpufeature.h    |   1 +
>  xen/include/asm-x86/pqos.h          |  48 ++++++++++++++
>  6 files changed, 182 insertions(+)
>  create mode 100644 xen/arch/x86/pqos.c
>  create mode 100644 xen/include/asm-x86/pqos.h
> 
> diff --git a/docs/misc/xen-command-line.markdown b/docs/misc/xen-command-line.markdown
> index a7ac53d..542eee5 100644
> --- a/docs/misc/xen-command-line.markdown
> +++ b/docs/misc/xen-command-line.markdown
> @@ -840,6 +840,13 @@ This option can be specified more than once (up to 8 times at present).
>  ### ple\_window
>  > `= <integer>`
>  
> +### pqos (Intel)
> +> `= List of ( <boolean> | pqos_monitor:<boolean> | rmid_max:<integer> )`
> +
> +> Default: `pqos=1,pqos_monitor:1,rmid_max:255`
> +
> +Configure platform QoS services.

Could you elaborate a bit more about them please?

and perhaps also specify what kind of CPUs can use this?