RFR (S): JDK-8076241: Remove unused methods mod_card_iterate() and non_clean_card_iterate_serial()

[Kim Barrett]

Hit send too soon on previous message, and forgot to reply to the important part.

On Apr 2, 2015, at 11:44 AM, Kim Barrett <kim.barrett at oracle.com> wrote:
> 
>>> I think the only one left is ClearNoncleanCardWrapper::do_MemRegion().  But I don’t guarantee there aren’t more.
>> 
>> Thanks for pointing this out.
>> 
>> As I mentioned before I'm happy to push a fix to add the comment back. Do you think this would be appropriate?
>> 
>> diff --git a/src/share/vm/memory/cardTableRS.cpp b/src/share/vm/memory/cardTableRS.cpp
>> --- a/src/share/vm/memory/cardTableRS.cpp
>> +++ b/src/share/vm/memory/cardTableRS.cpp
>> @@ -176,7 +176,10 @@
>> bool ClearNoncleanCardWrapper::is_word_aligned(jbyte* entry) {
>>  return (((intptr_t)entry) & (BytesPerWord-1)) == 0;
>> }
>> -
>> +// The regions are visited in *decreasing* address order.
>> +// This order aids with imprecise card marking, where a dirty
>> +// card may cause scanning, and summarization marking, of objects
>> +// that extend onto subsequent cards.
>> void ClearNoncleanCardWrapper::do_MemRegion(MemRegion mr) {
>>  assert(mr.word_size() > 0, "Error");
>>  assert(_ct->is_aligned(mr.start()), "mr.start() should be card aligned”);

Yes, that looks good.