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runtime: print pointers being put in checkPut

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In order to further diagnose #27993, I need to see exactly what
pointers are being added to the gcWork buffer too late.

Change-Id: I8d92113426ffbc6e55d819c39e7ab5eafa68668d
Reviewed-on: https://go-review.googlesource.com/c/152957
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
This commit is contained in:
Austin Clements 2018-12-06 13:54:07 -05:00
parent 5b48ab8881
commit bae1e70ac4
1 changed files with 14 additions and 6 deletions
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20
src/runtime/mgcwork.go
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@ -115,11 +115,19 @@ func (w *gcWork) init() {
w.wbuf2 = wbuf2
}
func (w *gcWork) checkPut() {
func (w *gcWork) checkPut(ptr uintptr, ptrs []uintptr) {
if debugCachedWork {
for atomic.Load(&gcWorkPauseGen) == w.pauseGen {
}
if throwOnGCWork {
printlock()
println("runtime: late gcWork put")
if ptr != 0 {
gcDumpObject("ptr", ptr, ^uintptr(0))
}
for _, ptr := range ptrs {
gcDumpObject("ptrs", ptr, ^uintptr(0))
}
throw("throwOnGCWork")
}
}
@ -129,7 +137,7 @@ func (w *gcWork) checkPut() {
// obj must point to the beginning of a heap object or an oblet.
//go:nowritebarrierrec
func (w *gcWork) put(obj uintptr) {
w.checkPut()
w.checkPut(obj, nil)
flushed := false
wbuf := w.wbuf1
@ -165,7 +173,7 @@ func (w *gcWork) put(obj uintptr) {
// otherwise it returns false and the caller needs to call put.
//go:nowritebarrierrec
func (w *gcWork) putFast(obj uintptr) bool {
w.checkPut()
w.checkPut(obj, nil)
wbuf := w.wbuf1
if wbuf == nil {
@ -188,7 +196,7 @@ func (w *gcWork) putBatch(obj []uintptr) {
return
}
w.checkPut()
w.checkPut(0, obj)
flushed := false
wbuf := w.wbuf1
@ -311,12 +319,12 @@ func (w *gcWork) balance() {
return
}
if wbuf := w.wbuf2; wbuf.nobj != 0 {
w.checkPut()
w.checkPut(0, wbuf.obj[:wbuf.nobj])
putfull(wbuf)
w.flushedWork = true
w.wbuf2 = getempty()
} else if wbuf := w.wbuf1; wbuf.nobj > 4 {
w.checkPut()
w.checkPut(0, wbuf.obj[:wbuf.nobj])
w.wbuf1 = handoff(wbuf)
w.flushedWork = true // handoff did putfull
} else {