tree 7590cfe506165a3232b6457afef41073f75f347d
parent 509592d188f6a30bb65b27a24f4c6f68716ea063
author Michael Anthony Knyszek <mknyszek@google.com> 1577465303 +0000
committer Michael Knyszek <mknyszek@google.com> 1578592806 +0000

runtime: add scavtrace debug flag and remove scavenge info from gctrace

Currently, scavenging information is printed if the gctrace debug
variable is >0. Scavenging information is also printed naively, for
every page scavenged, resulting in a lot of noise when the typical
expectation for GC trace is one line per GC.

This change adds a new GODEBUG flag called scavtrace which prints
scavenge information roughly once per GC cycle and removes any scavenge
information from gctrace. The exception is debug.FreeOSMemory, which may
force an additional line to be printed.

Fixes #32952.

Change-Id: I4177dcb85fe3f9653fd74297ea93c97c389c1811
Reviewed-on: https://go-review.googlesource.com/c/go/+/212640
Run-TryBot: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>