RFR: 8351266: JFR: -XX:StartFlightRecording:report-on-exit [v3]

[Erik Gahlin]

> Could I have a review of an enhancement that prints 'jfr view' when the JVM exits? The purpose is to simplify usage and avoid the need to dump to a file.
> 
> For more details, see the [CSR](https://bugs.openjdk.org/browse/JDK-8351370) 
> 
> Example usage:
> 
>     $ java -XX:StartFlightRecording:report-on-exit=hot-methods ...
>     [0.166s][info][jfr,startup] Started recording 1. No limit specified, using maxsize=250MB as default.
>     [0.166s][info][jfr,startup] 
>     [0.166s][info][jfr,startup] Use jcmd 66977 JFR.dump name=1 filename=FILEPATH to copy recording data to file.
>     
>                                               Java Methods that Executes the Most
>     
>     Method                                                                                                  Samples Percent
>     ------------------------------------------------------------------------------------------------------- ------- -------
>     sun.java2d.marlin.Renderer._endRendering(int, int)                                                          120  33.99%
>     sun.java2d.marlin.MarlinTileGenerator.getAlphaRLE(byte[], int, int)                                          22   6.23%
>     sun.awt.image.PNGImageDecoder.produceImage()                                                                 19   5.38%
>     sun.java2d.marlin.MarlinCache.copyAARowRLE_WithBlockFlags(int[], int[], int, int, int)                       14   3.97%
>     sun.java2d.marlin.MarlinTileGenerator.getAlphaNoRLE(byte[], int, int)                                         7   1.98%
>     sun.java2d.marlin.Renderer.copyAARow(int[], int, int, int, boolean)                                           7   1.98%
>     sun.awt.image.PNGImageDecoder.filterRow(byte[], byte[], int, int, int)                                        7   1.98%
>     sun.java2d.marlin.MarlinCache.copyAARowNoRLE(int[], int, int, int)                                            5   1.42%
>     sun.java2d.pipe.BufferedContext.validate(...)                                                                 5   1.42%
>     java.awt.GradientPaintContext.clipFillRaster(int[], int, int, int, int, double, double, double)               3   0.85%
> 
> Testing: jdk/jdk/jfr

Erik Gahlin has updated the pull request incrementally with one additional commit since the last revision:

  Fix whitespace

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/23958/files
  - new: https://git.openjdk.org/jdk/pull/23958/files/2f0d5a0b..c0a2ae4a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23958&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23958&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/23958.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23958/head:pull/23958

PR: https://git.openjdk.org/jdk/pull/23958