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

[Thomas Stüfe]

Hi Max,

Disclaimer: not a (R)eviewer.

Do we really need a list of all tags and all decorators?

Also: I assume what you print is the Log state as it is at the time the
hs-err file is printed. If logging was enabled/changed during lifetime of
the VM, e.g. with jcmd, would it be possible to see that? At least a
warning if logging was not enabled from the start on.

Kind Regards, Thomas




On Tue, Mar 29, 2016 at 9:00 PM, Max Ockner <max.ockner at oracle.com> 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
>
>