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runtime: clean up old mcentral code

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This change deletes the old mcentral implementation from the code base
and the newMCentralImpl feature flag along with it.

Updates #37487.

Change-Id: Ibca8f722665f0865051f649ffe699cbdbfdcfcf2
Reviewed-on: https://go-review.googlesource.com/c/go/+/221184
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
This commit is contained in:
Michael Anthony Knyszek 2020-02-19 16:37:48 +00:00 • committed by Michael Knyszek
parent 260dff3ca3
commit e6d0bd2b89
8 changed files with 25 additions and 665 deletions
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8
src/runtime/malloc.go
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@ -1178,11 +1178,9 @@ func largeAlloc(size uintptr, needzero bool, noscan bool) *mspan {
if s == nil {
throw("out of memory")
}
if go115NewMCentralImpl {
// Put the large span in the mcentral swept list so that it's
// visible to the background sweeper.
mheap_.central[spc].mcentral.fullSwept(mheap_.sweepgen).push(s)
}
// Put the large span in the mcentral swept list so that it's
// visible to the background sweeper.
mheap_.central[spc].mcentral.fullSwept(mheap_.sweepgen).push(s)
s.limit = s.base() + size
heapBitsForAddr(s.base()).initSpan(s)
return s