RRF: JEP-271: Unified GC Logging

kirk.pepperdine at gmail.com kirk.pepperdine at gmail.com
Mon Nov 23 13:26:05 UTC 2015


Hi Bengt,

I’ve not seen anything egregious as of yet though I’m no where near done. One comment for ostream.cpp.

-// log_name comes from -XX:LogFile=log_name, -Xloggc:log_name or
+// log_name comes from -XX:LogFile=log_name or
 // -XX:DumpLoadedClassList=<file_name>


IME, -Xloggc:log_name is the most common form used. Not stuck to it, just saying…

Regards,
Kirk

> On Nov 23, 2015, at 9:43 AM, Bengt Rutisson <bengt.rutisson at oracle.com> wrote:
> 
> 
> Hi Per,
> 
> Thanks for looking at this!
> 
> On 2015-11-23 09:51, Per Liden wrote:
>> Hi Bengt,
>> 
>> On 2015-11-19 16:29, Bengt Rutisson wrote:
>>> 
>>> Hi everyone,
>>> 
>>> After three pre-reviews it is time for the fist official review request
>>> for JEP-271 Unified GC Logging.
>>> 
>>> http://openjdk.java.net/jeps/271
>>> 
>>> Most code changes are in the hotspot code:
>>> http://cr.openjdk.java.net/~brutisso/JEP-271/review.00/webrev.00/
>> 
>> This is not a complete review, just a few things I noticed while browsing the webrev.
>> 
>> ----------------------------------------------
>> /src/share/vm/gc/g1/g1StringDedupQueue.cpp
>> 
>> 157   log_trace(gc, stringdedup)(
>> 158     "   [Queue]\n"
>> 159     "      [Dropped: " UINTX_FORMAT "]", _queue->_dropped);
>> 
>> Multi-line loging.
>> 
>> ----------------------------------------------
>> src/share/vm/gc/g1/g1StringDedupTable.cpp
>> 
>> 573   log_trace(gc, stringdedup)(
>> 574     "   [Table]\n"
>> 575     "      [Memory Usage: " G1_STRDEDUP_BYTES_FORMAT_NS "]\n"
>> 576     "      [Size: " SIZE_FORMAT ", Min: " SIZE_FORMAT ", Max: " SIZE_FORMAT "]\n"
>> 577     "      [Entries: " UINTX_FORMAT ", Load: " G1_STRDEDUP_PERCENT_FORMAT_NS ", Cached: " UINTX_FORMAT ", Added: " UINTX_FORMAT ", Removed: " UINTX_FORMAT "]\n"
>> 578     "      [Resize Count: " UINTX_FORMAT ", Shrink Threshold: " UINTX_FORMAT "(" G1_STRDEDUP_PERCENT_FORMAT_NS "), Grow Threshold: " UINTX_FORMAT "(" G1_STRDEDUP_PERCENT_FORMAT_NS ")]\n"
>> 579     "      [Rehash Count: " UINTX_FORMAT ", Rehash Threshold: " UINTX_FORMAT ", Hash Seed: 0x%x]\n"
>> 580     "      [Age Threshold: " UINTX_FORMAT "]",
>> 
>> Multi-line logging.
>> 
>> ----------------------------------------------
> 
> Good catch. Will fix.
> 
>> src/share/vm/gc/g1/g1StringDedup*.cpp
>> 
>> In general, I think the string dedup logging currently done with log_trace() should be log_debug() instead.
> 
> Yes, that makes sense. Will change that.
> 
> Bengt
> 
> 
>> 
>> cheers,
>> /Per
>> 
>>> 
>>> Some tests in the JDK repo have been updated:
>>> http://cr.openjdk.java.net/~brutisso/JEP-271/review.00/jdk-webrev.00/
>>> 
>>> As with the pre-reviews I have put togther some examples of what the new
>>> logging looks like:
>>> http://cr.openjdk.java.net/~brutisso/JEP-271/review.00/compare.html
>>> 
>>> The intent is that this should cover the bulk of the logging changes.
>>> There will most definitely be some follow up changes where we fix
>>> details in the log messages etc.
>>> 
>>> Among many other old logging flags this changeset removes the two flags
>>> PringGC and PrintGCDetails. These two will be added back with a follow
>>> up changeset, but when they are added back they will be marked as
>>> deprecated.
>>> 
>>> The reason for first removing them and then adding them back is to get
>>> testing without these flags. That way we will know that we clean out all
>>> usages of these flags from our testing.
>>> 
>>> Thanks,
>>> Bengt
> 

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