search for: config_hyperv_clock

Hi, Hyper-V TSC page clocksource is suitable for vDSO, however, the protocol defined by the hypervisor is different from VCLOCK_PVCLOCK. I implemented the required support re-using pvclock_page VVAR. Simple sysbench test shows the following results: Before: # time sysbench --test=memory --max-requests=500000 run ... real 1m22.618s user 0m50.193s sys 0m32.268s After: # time sysbench

Hi, Hyper-V TSC page clocksource is suitable for vDSO, however, the protocol defined by the hypervisor is different from VCLOCK_PVCLOCK. I implemented the required support re-using pvclock_page VVAR. Simple sysbench test shows the following results: Before: # time sysbench --test=memory --max-requests=500000 run ... real 1m22.618s user 0m50.193s sys 0m32.268s After: # time sysbench

...t;asm/pvclock.h> > +#include <asm/mshyperv.h> > #include <linux/math64.h> > #include <linux/time.h> > #include <linux/kernel.h> > @@ -141,6 +142,49 @@ static notrace u64 vread_pvclock(int *mode) > return last; > } > #endif > +#ifdef CONFIG_HYPERV_CLOCK > +/* (a * b) >> 64 implementation */ > +static inline u64 mul64x64_hi(u64 a, u64 b) > +{ > + u64 a_lo, a_hi, b_lo, b_hi, p1, p2; > + > + a_lo = (u32)a; > + a_hi = a >> 32; > + b_lo = (u32)b; > + b_hi = b >> 32; > +...

...t;asm/pvclock.h> > +#include <asm/mshyperv.h> > #include <linux/math64.h> > #include <linux/time.h> > #include <linux/kernel.h> > @@ -141,6 +142,49 @@ static notrace u64 vread_pvclock(int *mode) > return last; > } > #endif > +#ifdef CONFIG_HYPERV_CLOCK > +/* (a * b) >> 64 implementation */ > +static inline u64 mul64x64_hi(u64 a, u64 b) > +{ > + u64 a_lo, a_hi, b_lo, b_hi, p1, p2; > + > + a_lo = (u32)a; > + a_hi = a >> 32; > + b_lo = (u32)b; > + b_hi = b >> 32; > +...

...istd.h> #include <asm/msr.h> #include <asm/pvclock.h> +#include <asm/mshyperv.h> #include <linux/math64.h> #include <linux/time.h> #include <linux/kernel.h> @@ -141,6 +142,49 @@ static notrace u64 vread_pvclock(int *mode) return last; } #endif +#ifdef CONFIG_HYPERV_CLOCK +/* (a * b) >> 64 implementation */ +static inline u64 mul64x64_hi(u64 a, u64 b) +{ + u64 a_lo, a_hi, b_lo, b_hi, p1, p2; + + a_lo = (u32)a; + a_hi = a >> 32; + b_lo = (u32)b; + b_hi = b >> 32; + p1 = a_lo * b_hi; + p2 = a_hi * b_lo; + + return a_hi * b_hi + (p1 >> 32) + (p2...