Messages in this thread | | | Date | Fri, 2 Feb 2018 15:08:17 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH 4/4] sched/fair: Use a recently used CPU as an idle candidate and the basis for SIS |
| |
On Fri, Feb 02, 2018 at 01:46:47PM +0100, Peter Zijlstra wrote:
> +static void __intel_pstate_hwp_set_desired(int val) > +{ > + u64 value; > + > + value = rdmsrl(MSR_HWP_REQUEST); > + value &= ~GENMASK_ULL(23, 16); > + value |= (val & 0xff) << 16; > + wrmsrl(MSR_HWP_REQUEST, val); > +}
Also, if we keep a software shadow of that MSR, we can avoid the rdmsr, which might also help.
| |