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85a482fc24
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Michael Anthony Knyszek 85a482fc24 runtime: revert to using the precomputed trigger for pacer calculations 
Issue #53738 describes in detail how switching to using the actual
trigger point over the precomputed trigger causes a memory regression,
that arises from the fact that the PI controller in front of the
cons/mark ratio has a long time constant (for overdamping), so it
retains a long history of inputs.

This change, for the Go 1.19 cycle, just reverts to using the
precomputed trigger because it's safer, but in the future we should
consider moving away from such a history-sensitive smoothing function.

See the big comment in the diff and #53738 for more details.

Performance difference vs. 1.18 after this change:
https://perf.golang.org/search?q=upload:20220714.15

Fixes #53738.

Change-Id: I636993a730a3eaed25da2a2719860431b296c6f9
Reviewed-on: https://go-review.googlesource.com/c/go/+/417557
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
2022-07-19 14:36:58 +00:00
.github .github: remove duplicate security link 2022-01-07 17:55:09 +00:00
api debug/pe: add IMAGE_FILE_MACHINE_LOONGARCH{64,32} 2022-06-29 22:29:34 +00:00
doc doc/go1.19: add a release note for 'go list -json=SomeField' 2022-07-14 15:54:36 +00:00
lib/time lib/time, time/tzdata: update to 2022a 2022-05-31 08:53:53 +00:00
misc misc/cgo/testshared: run tests only in GOPATH mode 2022-07-13 20:43:22 +00:00
src runtime: revert to using the precomputed trigger for pacer calculations 2022-07-19 14:36:58 +00:00
test cmd/compile: fix type assert in dict pass 2022-07-13 16:06:45 +00:00
.gitattributes all: treat all files as binary, but check in .bat with CRLF 2020-06-08 15:31:43 +00:00
.gitignore internal/buildcfg: move build configuration out of cmd/internal/objabi 2021-04-16 19:20:53 +00:00
AUTHORS A+C: add Jinzhu Zhang 2022-05-08 17:28:26 +00:00
codereview.cfg codereview.cfg: add codereview.cfg for master branch 2021-02-19 18:44:53 +00:00
CONTRIBUTING.md
CONTRIBUTORS CONTRIBUTORS: update for the Go 1.19 release 2022-07-19 14:08:07 +00:00
LICENSE
PATENTS
README.md README.md: update wiki link 2022-04-26 16:21:18 +00:00
SECURITY.md SECURITY.md: replace golang.org with go.dev 2022-04-26 19:59:47 +00:00

README.md

The Go Programming Language

Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.

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