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Austin Clements 29be3f1999 runtime: generalize GC trigger 
Currently the GC triggering condition is an awkward combination of the
gcMode (whether or not it's gcBackgroundMode) and a boolean
"forceTrigger" flag.

Replace this with a new gcTrigger type that represents the range of
transition predicates we need. This has several advantages:

1. We can remove the awkward logic that affects the trigger behavior
   based on the gcMode. Now gcMode purely controls whether to run a
   STW GC or not and the gcTrigger controls whether this is a forced
   GC that cannot be consolidated with other GC cycles.

2. We can lift the time-based triggering logic in sysmon to just
   another type of GC trigger and move the logic to the trigger test.

3. This sets us up to have a cycle count-based trigger, which we'll
   use to make runtime.GC trigger concurrent GC with the desired
   consolidation properties.

For #18216.

Change-Id: If9cd49349579a548800f5022ae47b8128004bbfc
Reviewed-on: https://go-review.googlesource.com/37516
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>
 		2017-03-31 01:15:06 +00:00
.github doc: improve issue template and contribution guidelines 2017-02-11 20:42:06 +00:00
api math/big: define Word as uint instead of uintptr 2017-02-21 19:31:40 +00:00
doc spec: for non-constant map keys, add reference to evaluation order section 2017-03-24 18:51:10 +00:00
lib/time *.bash: always use the same string equality operator 2017-03-14 21:46:31 +00:00
misc cmd/link: make mach-o dwarf segment properly aligned 2017-03-30 12:29:18 +00:00
src runtime: generalize GC trigger 2017-03-31 01:15:06 +00:00
test cmd/compile: avoid infinite loops in dead blocks during phi insertion 2017-03-30 17:06:08 +00:00
.gitattributes
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.gitignore cmd/dist: move cmd/go z files to cmd/go/internal/cfg 2017-02-03 20:30:52 +00:00
AUTHORS A+C: automated update 2016-12-21 03:22:22 +00:00
CONTRIBUTING.md doc: improve issue template and contribution guidelines 2017-02-11 20:42:06 +00:00
CONTRIBUTORS A+C: automated update 2016-12-21 03:22:22 +00:00
LICENSE doc: revert copyright date to 2009 2016-06-01 22:40:04 +00:00
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README.md

The Go Programming Language

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