| commit | 6508fdad9d83d6792314639c9819a15894728682 | [log] [tgz] |
|---|---|---|
| author | Michael Anthony Knyszek <mknyszek@google.com> | Thu Apr 08 21:07:02 2021 +0000 |
| committer | Michael Knyszek <mknyszek@google.com> | Thu Oct 21 18:19:51 2021 +0000 |
| tree | c929f6a492bfff64479470459940c1c36959e531 | |
| parent | 8151b56c5d1de8f654a6e6789a0e607b55845c1e [diff] |
runtime: formalize and fix gcPercent synchronization Currently gcController.gcPercent is read non-atomically by gcControllerState.revise and gcTrigger.test, but these users may execute concurrently with an update to gcPercent. Although revise's results are best-effort, reading it directly in this way is, generally speaking, unsafe. This change makes gcPercent atomically updated for concurrent readers and documents the complete synchronization semantics. Because gcPercent otherwise only updated with the heap lock held or the world stopped, all other reads can remain unsynchronized. For #44167. Change-Id: If09af103aae84a1e133e2d4fed8ab888d4b8f457 Reviewed-on: https://go-review.googlesource.com/c/go/+/308690 Trust: Michael Knyszek <mknyszek@google.com> Run-TryBot: Michael Knyszek <mknyszek@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Michael Pratt <mpratt@google.com>
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