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Austin Clements 2d00007bdb runtime: flush on every write barrier while debugging 
Currently, we flush the write barrier buffer on every write barrier
once throwOnGCWork is set, but not during the mark completion
algorithm itself. As seen in recent failures like

  https://build.golang.org/log/317369853b803b4ee762b27653f367e1aa445ac1

by the time we actually catch a late gcWork put, the write barrier
buffer is full-size again.

As a result, we're probably not catching the actual problematic write
barrier, which is probably somewhere in the buffer.

Fix this by using the gcWork pause generation to also keep the write
barrier buffer small between the mark completion flushes it and when
mark completion is done.

For #27993.

Change-Id: I77618169441d42a7d562fb2a998cfaa89891edb2
Reviewed-on: https://go-review.googlesource.com/c/154638
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
2018-12-18 15:17:50 +00:00
.github .github: don't render author-facing text in ISSUE_TEMPLATE 2018-11-02 04:47:34 +00:00
api syscall: FreeBSD 12 ino64 support 2018-10-05 21:38:13 +00:00
doc doc: document GODEBUG options to disable use of instruction set extensions 2018-12-18 14:59:36 +00:00
lib/time lib/time: update tzdata to 2018g 2018-11-28 08:22:56 +00:00
misc cmd/fix,cmd/cgo,misc/cgo: map the EGLDisplay C type to uintptr in Go 2018-12-15 19:27:41 +00:00
src runtime: flush on every write barrier while debugging 2018-12-18 15:17:50 +00:00
test cmd/compile: increase nesting depth limit for type descriptors 2018-12-18 00:13:58 +00:00
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