On 27/11/2015 09:12, Roman Kagan wrote: >> > + n = div64_u64(time_now - stimer->exp_time, stimer->count) + 1; >> > + stimer->exp_time += n * stimer->count; > This is actually just a reminder calculation so I'd rather do it > directly with div64_u64_rem(). It took me a while to understand why it was a remained. :) Expanding Andrey's formula you get exp_time = exp_time + count + (time_now - exp_time) / count * count the remainder, (time_now - exp_time) % count would be time_now - exp_time - (time_now - exp_time) / count * count so -((time_now - exp_time) % count) is exp_time - time_now + (time_now - exp_time) / count * count so Andrey's expression is exp_time = time_now + (count - (time_now - exp_time) % count) Yeah, that looks nice. Paolo -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
