hg: jdk/sandbox: 8238665: Add JFR event for direct memory statistics

[chris.hegarty at oracle.com]

Changeset: adfb8ad070d5
Author:    ddong
Date:      2020-04-14 20:36 +0200
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/adfb8ad070d5

8238665: Add JFR event for direct memory statistics
Reviewed-by: egahlin, alanb

! src/java.base/share/classes/java/nio/Bits.java
! src/java.base/share/classes/java/nio/Buffer.java
! src/java.base/share/classes/jdk/internal/access/JavaNioAccess.java
! src/java.base/share/classes/jdk/internal/misc/VM.java
! src/java.base/share/classes/sun/nio/ch/FileChannelImpl.java
! src/java.management/share/classes/sun/management/ManagementFactoryHelper.java
+ src/jdk.jfr/share/classes/jdk/jfr/events/AbstractBufferStatisticsEvent.java
+ src/jdk.jfr/share/classes/jdk/jfr/events/DirectBufferStatisticsEvent.java
! src/jdk.jfr/share/classes/jdk/jfr/internal/instrument/JDKEvents.java
! src/jdk.jfr/share/conf/jfr/default.jfc
! src/jdk.jfr/share/conf/jfr/profile.jfc
+ test/jdk/jdk/jfr/event/runtime/TestDirectBufferStatisticsEvent.java
! test/lib/jdk/test/lib/jfr/EventNames.java