Re: [PATCH V7 07/18] x86/pks: Preserve the PKRS MSR on context switch

[Thomas Gleixner <tglx@xxxxxxxxxxxxx>]

On Tue, Aug 03 2021 at 21:32, ira weiny wrote:
> @@ -658,6 +659,8 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
>  	/* Load the Intel cache allocation PQR MSR. */
>  	resctrl_sched_in();
>  
> +	pkrs_write_current();

This is invoked from switch_to() and does this extra get/put_cpu_ptr()
dance in the write function for no reason. Can you please stop sticking
overhead into the hotpath just because?

Thanks,

        tglx