| commit | c40a3731f45047c3b903cafae287ea8e5762e062 | [log] [tgz] |
|---|---|---|
| author | Michael Pratt <mpratt@google.com> | Fri Mar 07 13:53:34 2025 -0500 |
| committer | Gopher Robot <gobot@golang.org> | Mon Mar 10 08:29:59 2025 -0700 |
| tree | ae72dc57c4ab228b3bbf7a289328eed861eb5fc5 | |
| parent | c3950f84303ad05d0ae1ff734ced85ab803e658b [diff] |
internal/godebugs: add decoratemappings as an opaque godebug setting This adds a new godebug to control whether the runtime applies the anonymous memory mapping annotations added in https://go.dev/cl/646095. It is enabled by default. This has several effects: * The feature is only enabled by default when the main go.mod has go >= 1.25. * This feature can be disabled with GODEBUG=decoratemappings=0, or the equivalents in go.mod or package main. See https://go.dev/doc/godebug. * As an opaque setting, this option will not appear in runtime/metrics. * This setting is non-atomic, so it cannot be changed after startup. I am not 100% sure about my decision for the last two points. I've made this an opaque setting because it affects every memory mapping the runtime performs. Thus every mapping would report "non-default behavior", which doesn't seem useful. This setting could trivially be atomic and allow changes at run time, but those changes would only affect future mappings. That seems confusing and not helpful. On the other hand, going back to annotate or unannotate every previous mapping when the setting changes is unwarranted complexity. For #71546. Change-Id: I6a6a636c5ad551d76691cba2a6f668d5cff0e352 Reviewed-on: https://go-review.googlesource.com/c/go/+/655895 Reviewed-by: Michael Knyszek <mknyszek@google.com> Reviewed-by: Ian Lance Taylor <iant@golang.org> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Auto-Submit: Michael Pratt <mpratt@google.com>
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