[jdk17u-dev] Integrated: JDK-8306768: CodeCache Analytics reports wrong threshold

[Anton Kozlov]

On Tue, 25 Apr 2023 09:06:28 GMT, Anton Kozlov <akozlov at openjdk.org> wrote:

> Jcmd CodeCache_Analytics uses own implementation of threshold calculation, allowing an error to creep in, making report invalid. The suggestion is to use the existing method for free ratio calculation. After the fix, the reported values become sane.
> 
> 
> java -XX:InitialCodeCacheSize=1G -XX:ReservedCodeCacheSize=1G ...
> 
> cmd jdk.compiler/com.sun.tools.javac.launcher.Main  Compiler.CodeHeap_Analytics | grep -A 2 "Threshold for method to be considered 'cold'"
> 
> Threshold for method to be considered 'cold':    -2037.960
> min. hotness =   1016
> avg. hotness =   2048
> --
> Threshold for method to be considered 'cold':    -2037.960
> min. hotness =   1016
> avg. hotness =   2048
> --
> Threshold for method to be considered 'cold':    -2037.960
> No hotness data available

This pull request has now been integrated.

Changeset: 243e6430
Author:    Anton Kozlov <akozlov at openjdk.org>
Committer: Paul Hohensee <phh at openjdk.org>
URL:       https://git.openjdk.org/jdk17u-dev/commit/243e643076f70c2cfb480897e1640a21e7ac6552
Stats:     3 lines in 1 file changed: 1 ins; 1 del; 1 mod

8306768: CodeCache Analytics reports wrong threshold

Reviewed-by: phh

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PR: https://git.openjdk.org/jdk17u-dev/pull/1295