RFR: 8270870: Simplify G1ServiceThread

[Thomas Schatzl]

On Thu, 22 Jul 2021 10:15:08 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> Please review this simplification of the internal control structure of
> G1ServiceThread, particularly around the entry and exit of monitor contexts.
> 
> In addition, the run_task logging now includes the delay between the
> scheduled time to run and the actual, as that seems like useful information
> to have sometimes.
> 
> I also changed the monitor rank from nonleaf to leaf.  There was no reason
> to use nonleaf, and leaf avoids questions about why nonleaf was used.
> 
> Testing:
> mach5 tier1-3.  This includes the gtest for G1ServiceThread.
> 
> Ran a test program with gc+task logging enabled and checked that the logging
> output looked okay.

Lgtm.

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

Marked as reviewed by tschatzl (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/4868