[JFR incubator] [RFR] JDK-8238590: Enable JFR by default during compilation in 8u

Ben Evans bevans at newrelic.com
Fri Feb 14 10:43:32 UTC 2020

Hi Mario,

Some of our teams have reported noticeable performance regressions on
JDK8 + JFR even with JFR disabled at runtime.

I am investigating further but don't have solid evidence that I can share
yet - but I would urge everyone who wants this backport to happen (at NR we
very much do) to do as much performance regression testing as possible. It
would not be a good look if adding this feature caused problems for other



On Mon, Feb 10, 2020 at 3:32 PM Mario Torre <neugens at redhat.com> wrote:

> Hi all,
> During the OpenJDK Committers Workshop it was requested to enable JFR
> by default, and the proposed patch does exactly that.
> http://cr.openjdk.java.net/~neugens/8238590/webrev.00/jdk8u-jfr-incubator.changeset
> Can somebody please review it?
> Cheers,
> Mario
> --
> Mario Torre
> Associate Manager, Software Engineering
> Red Hat GmbH <https://www.redhat.com>
> 9704 A60C B4BE A8B8 0F30  9205 5D7E 4952 3F65 7898

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