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Hana Kim 61f92ee56a internal/trace: fix GC time computation of short goroutines 
Goroutine analysis reports the sum of all overlapping GC intervals as
the GCTime of a goroutine. The computation is done by adding the length
of a completed GC interval to 'active' goroutines when processing the
corresponding EvGCDone event. This change fixes the two corner cases
the current implementation ignores:

1) Goroutine that ends during GC. Previously, this goroutine was ignored
and GC time was undercounted. We handle this case by setting the
gcStartTime only when GC is active and handling non-zero gcStartTime
when processing EvGoStop and EvGoStart.

2) Goroutine that starts during GC. Previously, the entire GC interval
length was added to the Goroutine's GCTime which resulted in overcount
of GC time. We handle this case by computing the length of overlapped
period precisely.

Change-Id: Ifa8e82672ec341b5ff87837209f4311fa7262b7f
Reviewed-on: https://go-review.googlesource.com/100842
Reviewed-by: Heschi Kreinick <heschi@google.com>
Run-TryBot: Heschi Kreinick <heschi@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2018-03-15 19:53:42 +00:00
.github github: update Pull Request template 2018-02-21 02:07:46 +00:00
api syscall: support Getwd on all BSDs 2018-02-13 15:41:19 +00:00
doc doc/faq: add a Q&A about virus scanners 2018-02-28 05:55:31 +00:00
lib/time all: use HTTPS for iana.org links 2018-02-13 18:36:48 +00:00
misc runtime: identify special functions by flag instead of address 2018-03-15 17:31:57 +00:00
src internal/trace: fix GC time computation of short goroutines 2018-03-15 19:53:42 +00:00
test test/codegen: port floats tests to codegen 2018-03-15 18:05:59 +00:00
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.gitignore .gitignore: ignore src/cmd/dist/dist 2017-10-28 21:55:49 +00:00
AUTHORS A+C: update my name and spelling 2018-02-21 04:12:57 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS C: add Filippo Valsorda's @golang.org email 2018-03-12 22:29:04 +00:00
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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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Our canonical Git repository is located at https://go.googlesource.com/go. There is a mirror of the repository at https://github.com/golang/go.

Unless otherwise noted, the Go source files are distributed under the BSD-style license found in the LICENSE file.

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Contributing

Go is the work of hundreds of contributors. We appreciate your help!

To contribute, please read the contribution guidelines: https://golang.org/doc/contribute.html

Note that the Go project uses the issue tracker for bug reports and proposals only. See https://golang.org/wiki/Questions for a list of places to ask questions about the Go language.