RFR 8243572: Multiple tests fail with assert(cld->klasses() != 0LL) failed: unexpected NULL for cld->klasses()

Harold Seigel harold.seigel at oracle.com
Tue Apr 28 19:42:11 UTC 2020

Hi Mandy,

Thanks for the review.

I thought that the term 'hidden classes' referred to weak hidden classes 
and we would use the term 'strong hidden classes' to refer to hidden 
classes that were not weak.  Hence, I don't think we need to change 
'hidden_classes...' to 'non_strong_hidden_classes...'.

Also, I think that 'non_strong_hidden_classes' sounds really awkward and 
would prefer to either leave it as is or change to 'weak_hidden_classes'.

Does that sound okay?

Thanks, Harold

On 4/28/2020 3:36 PM, Mandy Chung wrote:
> Hi Harold,
> On 4/28/20 10:27 AM, Harold Seigel wrote:
>> :
>> Open Webrev: 
>> http://cr.openjdk.java.net/~hseigel/bug_8243572/webrev/index.html
> This patch looks okay in general.  JFR is tracking the classes loaded 
> that has no strong relationship with any class loader.  VM 
> implementation calls such CLD that has a class mirror.  In other 
> words, it is only tracking the hidden classes defined with the default 
> option.
> So some suggestion:
> classLoaderStats.hpp
>    82   uintx             _hidden_classes_count;
> rename this on to non_strong_hidden_classes_count
> src/hotspot/share/jfr/metadata/metadata.xml
>   221     <Field type="boolean" name="hiddenClassLoader" label="Hidden Class Loader" />
> There is no such thing called "hidden class loader".  Perhaps simply "hidden classes"?
>   727     <Field type="long" name="hiddenClassCount" label="Hidden Classes" description="Number of hidden classes" />
>   728     <Field type="ulong" contentType="bytes" name="hiddenChunkSize" label="Total Hidden Classes Chunk Size"
>   729       description="Total size of all allocated metaspace chunks for hidden classes (each chunk has several blocks)" />
>   730     <Field type="ulong" contentType="bytes" name="hiddenBlockSize" label="Total Hidden Classes Block Size"
>   731       description="Total size of all allocated metaspace blocks for hidden classes (each chunk has several blocks)" />
> what about s/hidden classes/non-strong hidden classes/?
> Mandy

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