RFR: 8154110: Update class* and safepoint* logging subsystems

[Ioi Lam]

The changes look good to me.

I think each line of the "constraints" prints only one item (?). If so, 
we should use the singular form. (Max, could you post a sample output 
from -Xlog?)

Thanks
- Ioi

On 4/26/16 2:05 PM, Max Ockner wrote:
> New webrev: http://cr.openjdk.java.net/~mockner/8154110.hotspot.02/
>
> I have responded to these suggestions:
>  - class+loaderdata -> class+loader+data
>  - class+loaderconstraints -> class+loader+constraints
>  - I did not change constraints to constraint. I agree with Coleen's 
> reasoning, but please let me know if you think there is a good reason 
> to change it.
>
> Thanks,
> Max
>
> On 4/26/2016 4:05 PM, Coleen Phillimore wrote:
>>
>> Hi,
>>
>> Yes, his looks good, but I agree that class, loaderconstraints => 
>> class, loader, constraints
>> and class, loaderdata => class, loader, data
>>
>> But I think constraints should be plural, we're logging the 
>> constraint checking (more than one constraint) so plural makes more 
>> sense to me.
>>
>> Okay, I think I now prefer the combination of short words to do 
>> logging after seeing this change.
>>
>> Thanks,
>> Coleen
>>
>>
>> On 4/26/16 3:44 PM, Robbin Ehn wrote:
>>> Hi Max,
>>>
>>> I was just looking at these tags and thought maybe they should be 
>>> split, nice !
>>>
>>> I have request for the ' constraints' tag, can make it singular 
>>> (without ending 's') ?
>>>
>>> (there are a few other ones in plural which we also should fix)
>>>
>>> Otherwise I think this looks good!
>>>
>>> Thanks!
>>>
>>> /Robbin
>>>
>>> On 04/26/2016 07:42 AM, Max Ockner wrote:
>>>> Hello,
>>>>
>>>> This change factors the tags from the class and safepoint logging 
>>>> subsystems into smaller tags, including "class" and "safepoint" 
>>>> tags which are included in tag combination in their respective 
>>>> subsystems.
>>>>
>>>> classresolve -> class+resolve
>>>> classload -> class+load
>>>> classunload -> class+unload
>>>> classpath -> class+path
>>>> classloaderdata -> class+loaderdata
>>>> classload+constraints -> class+loaderconstraints
>>>> classinit -> class+init
>>>> classload+preorder -> class+preorder
>>>>
>>>> safepointcleanup -> safepoint+cleanup
>>>>
>>>> class+loaderdata can be further factored into class+load+data. Same 
>>>> with class+loaderconstraints.
>>>>
>>>> Bug: https://bugs.openjdk.java.net/browse/JDK-8154110
>>>> webrev(hotspot): http://cr.openjdk.java.net/~mockner/8154110.hotspot/
>>>> webrev(jdk): http://cr.openjdk.java.net/~mockner/8154110.jdk/
>>>>
>>>> Tested with jtreg hotspot tests. jdk tests currently running.
>>>>
>>>> Thanks,
>>>> Max
>>>
>>
>