[jdk17u-dev] Integrated: 8267517: async logging for stdout and stderr

[Xin Liu]

On Fri, 7 Jul 2023 00:27:09 GMT, Xin Liu <xliu at openjdk.org> wrote:

> This PR backports JDK-8267517 to jdk17u. -Xlog:async will route LogOutput stdout/stderr to the asynchronous logging queue like ordinary log files. The reason we do is that some Java application outputs logs to stdout/stderr and redirect them to files then. 
> 
> This is **NOT** a clean backport. It's because jdk17u is missing a few patches, such as JDK-8273471, JDK-8269004. I tried to backport them beforehand, but they both have dependencies.  I manually resolve a couple of conflicts. 
> 
> We have verified patch like how we verified for jdk-tip. We output verbose gclog to stdout `-Xlog:gc=trace:stdout` and leverage software flow control to pause our console(C-s). Java threads don't be blocked with '-Xlog:async'. Without this patch, kernel puts Java threads which require GC to 'sleep' state when unified log is blocked.
> 
> ---------
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This pull request has now been integrated.

Changeset: e61bb2e0
Author:    Xin Liu <xliu at openjdk.org>
Committer: Aleksey Shipilev <shade at openjdk.org>
URL:       https://git.openjdk.org/jdk17u-dev/commit/e61bb2e00d31449b3473fac473448f7cca1ddfd7
Stats:     126 lines in 7 files changed: 95 ins; 7 del; 24 mod

8267517: async logging for stdout and stderr

Reviewed-by: shade
Backport-of: 7aff03aee1a5cd70638d8bbafeb7765bc7beea45

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PR: https://git.openjdk.org/jdk17u-dev/pull/1555