RFR: 8151526: Print -Xlog configuration in the hs_err_pid file

[Coleen Phillimore]

This change looks good.  You found the duplicated code for jcmd.

To test this before  you check this in to verify, start a JVM running 
some java program in an infinite loop, and do jcmd <pid> VM.info

Thanks,
Coleen

On 3/29/16 3:00 PM, Max Ockner wrote:
> Hello,
> Please review another Unified Logging change. They are almost done, 
> and we are serious this time.
>
> bug: https://bugs.openjdk.java.net/browse/JDK-8151526
> webrev: http://cr.openjdk.java.net/~mockner/8151526.01/
>
> The logging configuration is now printed in each hs_err file. The 
> output is the same as you would see from -Xlog:logging=trace and it is 
> obtained from LogConfiguration::describe().
>
> Below is a sample of the hs_err contents. The Logging info is printed 
> after VM Arguments and Whitebox, and before Environment Variables.
>
> VM Arguments:
> java_command: Kaboom
> java_class_path (initial): .
> Launcher Type: SUN_STANDARD
>
> Logging:
> Available log levels: off, trace, debug, info, warning, error
> Available log decorators: time (t), uptime (u), timemillis (tm), 
> uptimemillis (um), timenanos (tn), uptimenanos (un), hostname (hn), 
> pid (p), tid (ti), level (l), tags (tg)
> Available log tags: alloc, age, barrier, biasedlocking, bot, census, 
> classhisto, classresolve, classinit, classload, classloaderdata, 
> classunload, classpath, compaction, cpu, cset, defaultmethods, ergo, 
> exceptions, exit, freelist, gc, heap, humongous, ihop, itables, jni, 
> liveness, logging, marking, metaspace, modules, monitorinflation, os, 
> phases, plab, promotion, preorder, protectiondomain, ref, refine, 
> region, remset, safepoint, safepointcleanup, scavenge, scrub, 
> stacktrace, start, startuptime, state, stats, stringdedup, 
> stringtable, survivor, sweep, task, thread, tlab, time, 
> verboseverification, verify, vmoperation, vtables
> Log output configuration:
> #0: stdout all=off uptime,level,tags,
> #1: stderr all=warning uptime,level,tags,
>
> Environment Variables:
> JAVA_HOME=/scratch/mockner/UL/8151526/build/linux-x86_64-normal-server-fastdebug/images/jdk 
>
> PATH=/home/mockner/tools/webrev:/bin:/usr/bin:/usr/local/bin:/usr/sbin:/home/mockner/bin:/home/mockner/linux/bin 
>
> SHELL=/bin/bash
> OS=Linux
>