RFR (S) JDK-8149023: Event based tracing should cover safepoint begin and end
david.holmes at oracle.com
Thu Feb 11 07:09:52 UTC 2016
On 10/02/2016 1:45 AM, David Simms wrote:
> Greetings all,
> I have small request for review, for adding event based tracing to
> "SafepointSynchronize::begin()" and "end()"
> JBS: https://bugs.openjdk.java.net/browse/JDK-8149023
> Webrev: http://cr.openjdk.java.net/~dsimms/8149023/webrev0/
Repeating what I said in email for the public record ...
I'm always concerned about the overhead of tracing when it is not being
I'm also concerned that it is not obvious what gets executed when these
events are created, destroyed or committed. We have to be sure there are
no actions that might interfere with the safepoint protocol, or which
might themselves introduce latency into the safepoint process.
A new comment is that the event.commit blocks seems highly repetitive in
many cases - dare I suggest using a macro? :)
> Testing: built all platforms (RBT), local jtreg
> /David Simms
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