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runtime: add GODEBUG=gccheckmark=0/1

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Previously, gccheckmark could only be enabled or disabled by calling
runtime.GCcheckmarkenable/GCcheckmarkdisable.  This was a necessary
hack because GODEBUG was broken.

Now that GODEBUG works again, move control over gccheckmark to a
GODEBUG variable and remove these runtime functions.  Currently,
gccheckmark is enabled by default (and will probably remain so for
much of the 1.5 development cycle).

Change-Id: I2bc6f30c21b795264edf7dbb6bd7354b050673ab
Reviewed-on: https://go-review.googlesource.com/2603
Reviewed-by: Rick Hudson <rlh@golang.org>
This commit is contained in:
Austin Clements 2015-01-09 14:00:40 -05:00
parent 86fdcbedbc
commit 654297cb02
5 changed files with 18 additions and 27 deletions
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8
src/runtime/malloc.go
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@ -611,14 +611,6 @@ func gcwork(force int32) {
}
}
func GCcheckmarkenable() {
systemstack(gccheckmarkenable_m)
}
func GCcheckmarkdisable() {
systemstack(gccheckmarkdisable_m)
}
// gctimes records the time in nanoseconds of each phase of the concurrent GC.
type gctimes struct {
sweepterm int64 // stw