git: openjdk/jdk21u: master: 8315702: jcmd Thread.dump_to_file slow with millions of virtual threads

[Rob McKenna]

Changeset: b8f0f91e
Author:    Rob McKenna <robm at openjdk.org>
Date:      2023-09-15 19:07:20 +0000
URL:       https://git.openjdk.org/jdk21u/commit/b8f0f91e4fefba5f6cfadabdf024fce3235a2d2d

8315702: jcmd Thread.dump_to_file slow with millions of virtual threads

Backport-of: 3c258ac907287850d690375bae07c0575d1f1463

! src/java.base/share/classes/jdk/internal/vm/ThreadDumper.java