| commit | c847589ad06a1acfcceaac7b230c0d5a826caab8 | [log] [tgz] |
|---|---|---|
| author | Michael Anthony Knyszek <mknyszek@google.com> | Tue May 19 16:33:17 2020 +0000 |
| committer | Michael Knyszek <mknyszek@google.com> | Thu May 21 14:48:50 2020 +0000 |
| tree | fac92e13da0a4e8cff561c73010c34a7fb2e9a93 | |
| parent | 39ea0ea05dcfa281dc5977410b60458f2d2adb99 [diff] |
runtime: synchronize StartTrace and StopTrace with sysmon Currently sysmon is not stopped when the world is stopped, which is in general a difficult thing to do. The result of this is that when tracing starts and the value of trace.enabled changes, it's possible for sysmon to fail to emit an event when it really should. This leads to traces which the execution trace parser deems inconsistent. Fix this by putting all of sysmon's work behind a new lock sysmonlock. StartTrace and StopTrace both acquire this lock after stopping the world but before performing any work in order to ensure sysmon sees the required state change in tracing. This change is expected to slow down StartTrace and StopTrace, but will help ensure consistent traces are generated. Updates #29707. Fixes #38794. Change-Id: I64c58e7c3fd173cd5281ffc208d6db24ff6c0284 Reviewed-on: https://go-review.googlesource.com/c/go/+/234617 Run-TryBot: Michael Knyszek <mknyszek@google.com> Run-TryBot: Ian Lance Taylor <iant@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org> Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com> Reviewed-by: Michael Pratt <mpratt@google.com>
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