Re: [PATCH v4 6/8] tracing/histogram: Optimize division by a power of 2

On Tue, 26 Oct 2021 18:09:22 -0700 Kalesh Singh kaleshsingh@google.com wrote:

...

delta = mult * div / 2^20

That is if mult is a power of two, then there would be no rounding errors, and the delta is zero, making the max infinite:

That should have been (as shown in the algorithm)

delta = mult * div - 2 ^ 20

As mult is 2^20 / div; and the above should end up zero if there's no rounding issues, as it would be:

delta = (2^20 / div) * div - 2^20

-- Steve