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Michael Anthony Knyszek 9b30811280 runtime: redefine scavenge goal in terms of heap_inuse
This change makes it so that the scavenge goal is defined primarily in
terms of heap_inuse at the end of the last GC rather than next_gc. The
reason behind this change is that next_gc doesn't take into account
fragmentation, and we can fall into situation where the scavenger thinks
it should have work to do but there's no free and unscavenged memory
available.

In order to ensure the scavenge goal still tracks next_gc, we multiply
heap_inuse by the ratio between the current heap goal and the last heap
goal, which describes whether the heap is growing or shrinking, and by
how much.

Finally, this change updates the documentation for scavenging and
elaborates on why the scavenge goal is defined the way it is.

Fixes #34048.
Updates #32828.

Change-Id: I8deaf87620b5dc12a40ab8a90bf27932868610da
Reviewed-on: https://go-review.googlesource.com/c/go/+/193040
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
2019-09-25 22:15:39 +00:00
.github .github: don't render author-facing text in ISSUE_TEMPLATE 2018-11-02 04:47:34 +00:00
api api/go1.13: add debug/elf.Symbol fields added in CL 184099 2019-08-08 18:44:16 +00:00
doc doc: reword to avoid the confusing term 'anew' 2019-09-20 08:06:51 +00:00
lib/time lib/time: update tz data to 2019b 2019-07-03 23:08:27 +00:00
misc all: remove trailing whitespace from HTML files 2019-09-18 18:32:20 +00:00
src runtime: redefine scavenge goal in terms of heap_inuse 2019-09-25 22:15:39 +00:00
test test: add testcase for gccgo compiler buglet 2019-09-25 18:10:57 +00:00
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AUTHORS A+C: change email address for Akhil Indurti 2019-09-09 15:30:38 +00:00
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