On Wed, Jul 18, 2018 at 5:03 AM Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
>
> And as said before, we can compress the state from 12 bytes, to 6 bits
> (or 1 byte), giving another 11 bytes for 59 bytes free.
>
> Leaving us just 5 bytes short of needing a single cacheline :/
Do you actually need 64 bits for the times?
That's the big cost. And it seems ridiculous, if you actually care about size.
You already have a 64-bit start time. Everything else is some
cumulative relative time. Do those really need 64-bit and nanosecond
resolution?
Maybe a 32-bit microsecond would be ok - would you ever account more
than 35 minutes of anything without starting anew?
Linus
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