FW: RFR(S): 8215284: Reduce noise induced by periodic task getFileSize()
Markus Gronlund
markus.gronlund at oracle.com
Thu Dec 13 09:57:59 UTC 2018
Hello,
I am widening this post a tad bit in the hope of getting review assistance for this particular issue.
Bug: https://bugs.openjdk.java.net/browse/JDK-8215284
Webrev: http://cr.openjdk.java.net/~mgronlun/8215284/webrev01/
Thanks in advance
Markus
-----Original Message-----
From: Markus Gronlund
Sent: den 12 december 2018 23:52
To: hotspot-jfr-dev at openjdk.java.net
Subject: RFR(S): 8215284: Reduce noise induced by periodic task getFileSize()
Greetings,
Can I get a review for the following:
Bug: https://bugs.openjdk.java.net/browse/JDK-8215284
Webrev: http://cr.openjdk.java.net/~mgronlun/8215284/webrev01/
Summary: The periodic task operation runs in Java checking the file size of the current chunk. This produces unnecessary exposure and noise by the JFR framework itself. It is especially interesting that the path to check the size of a file produces a memory allocation trace....most likely some effect of autoboxing and lambda constructions...
We can avoid this by diving into the VM instead to test for the rotateDisk condition since the amount written to the current chunk is already tracked there.
Testing: jdk_jfr
Thanks
Markus
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