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runtime: debug prints for spanBytesAlloc underflow

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Updates #18043.

Change-Id: I24e687fdd5521c48b672987f15f0d5de9f308884
Reviewed-on: https://go-review.googlesource.com/34612
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Rick Hudson <rlh@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Austin Clements 2016-12-19 22:55:53 -05:00
parent 7f1ff65c39
commit 2817e77024
1 changed files with 4 additions and 1 deletions
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5
src/runtime/mgcsweep.go
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@ -405,7 +405,10 @@ func reimburseSweepCredit(unusableBytes uintptr) {
// Nobody cares about the credit. Avoid the atomic.
return
}
if int64(atomic.Xadd64(&mheap_.spanBytesAlloc, -int64(unusableBytes))) < 0 {
nval := atomic.Xadd64(&mheap_.spanBytesAlloc, -int64(unusableBytes))
if int64(nval) < 0 {
// Debugging for #18043.
print("runtime: bad spanBytesAlloc=", nval, " (was ", nval+uint64(unusableBytes), ") unusableBytes=", unusableBytes, " sweepPagesPerByte=", mheap_.sweepPagesPerByte, "\n")
throw("spanBytesAlloc underflow")
}
}