mul_u64_u32_shr

Name:mul_u64_u32_shr

Proto:static inline u64 mul_u64_u32_shr(u64 a, u32 mul, unsigned int shift)

Type:u64

Parameter:

Type	Parameter	Name
u64	a
u32	mul
unsigned int	shift

198

al = a

199

ah = a >> 32

201

ret = mul_u32_u32(al, mul) >> shift

202

If ah Then ret += mul_u32_u32(ah, mul) << 32 - shift

205

Return ret

**Caller**
Name	Describe
cycles_2_ns	Accelerators for sched_clock()* convert from cycles(64bits) => nanoseconds (64bits)* basic equation:* ns = cycles / (freq / ns_per_sec)* ns = cycles * (ns_per_sec / freq)* ns = cycles * (10^9 / (cpu_khz * 10^3))* ns = cycles * (10^6 / cpu_khz)
__set_cyc2ns_scale
__calc_delta	delta_exec * weight / lw.weight* OR* (delta_exec * (weight * lw->inv_weight)) >> WMULT_SHIFT* Either weight := NICE_0_LOAD and lw \e sched_prio_to_wmult[], in which case* we're guaranteed shift stays positive because inv_weight is guaranteed to
decay_load	Approximate:* val * y^n, where y^32 ~= 0.5 (~1 scheduling period)
clocksource_stop_suspend_timing	locksource_stop_suspend_timing - Stop measuring the suspend timing@cs: current clocksource from timekeeping@cycle_now: current cycles from timekeeping* This function will calculate the suspend time from suspend timer.

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