code review 86040043: runtime: use 3x fewer nanotime calls in garbage collection

runtime: use 3x fewer nanotime calls in garbage collection

Cuts the number of calls from 6 to 2 in the non-debug case.

[rsc, 2014-04-09 14:30:13]

Hello golang-codereviews@googlegroups.com (cc: 0intro, aram@mgk.ro, khr),

I'd like you to review this change to
https://code.google.com/p/go/

[rsc, 2014-04-09 14:34:42]

The debug print changing from MB to kB was not intended here. I've reverted
that change.

(I did it because I was trying to understand why the garbage collector was
running so often on such a tiny heap. The answer is that the test was
calling it explicitly.)

[iant, 2014-04-09 14:36:00]

LGTM

[rsc, 2014-04-09 14:38:14]

*** Submitted as https://code.google.com/p/go/source/detail?r=29a6a4ac1164 ***

runtime: use 3x fewer nanotime calls in garbage collection

Cuts the number of calls from 6 to 2 in the non-debug case.

LGTM=iant
R=golang-codereviews, iant
CC=0intro, aram, golang-codereviews, khr
https://codereview.appspot.com/86040043