826439 - histogram stats for non-linear histograms should use floats for log calculations

Status: RESOLVED FIXED

(Toolkit :: Telemetry, defect)

Description

[Nathan Froyd [:froydnj]]

We don't need the extra precision of doubles and the float versions are significantly faster.

Comment 1

[Nathan Froyd [:froydnj]]

Attachment: use floats instead of doubles for exponential histogram statistic calculations

As suggested elsewhere.

Comment 2

[Nathan Froyd [:froydnj]]

https://hg.mozilla.org/integration/mozilla-inbound/rev/6e391f971a13

Comment 3

[Ed Morley [:emorley]]

Backed out for xpcshell failures:
https://tbpl.mozilla.org/?tree=Mozilla-Inbound&rev=6e391f971a13

https://hg.mozilla.org/integration/mozilla-inbound/rev/2da7fcc87f83

Comment 4

[Nathan Froyd [:froydnj]]

Relanded with simple fix to avoid float precision problems.  xpcshell tests green locally (linux64) and on try: https://tbpl.mozilla.org/?tree=Try&rev=a3a77008889c (the b-c failures are unrelated to this change).

https://hg.mozilla.org/integration/mozilla-inbound/rev/c43c4835dafd

Comment 5

[Phil Ringnalda (:philor)]

https://hg.mozilla.org/mozilla-central/rev/c43c4835dafd