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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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6
src/runtime/mcache.go
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@ -131,11 +131,7 @@ func (c *mcache) refill(spc spanClass) {
if s.sweepgen != mheap_.sweepgen+3 {
throw("bad sweepgen in refill")
}
if go115NewMCentralImpl {
mheap_.central[spc].mcentral.uncacheSpan(s)
} else {
atomic.Store(&s.sweepgen, mheap_.sweepgen)
}
mheap_.central[spc].mcentral.uncacheSpan(s)
}
// Get a new cached span from the central lists.