RFR: 8260267: ZGC: Reduce mark stack usage [v3]

[Per Liden]

On Thu, 29 Apr 2021 19:27:28 GMT, Stefan Johansson <sjohanss at openjdk.org> wrote:

>> Per Liden has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Review comments from StefanJ and Albert
>
> src/hotspot/share/gc/z/zMarkStackAllocator.cpp line 72:
> 
>> 70: 
>> 71: static bool is_high_usage(size_t size) {
>> 72:   // Consider usage to be high if we've used more than a 8th of the available space.
> 
> "a 8th" -> "an 8th" or "one 8th"

Fixed!

> src/hotspot/share/gc/z/zMarkStackAllocator.cpp line 101:
> 
>> 99: 
>> 100:   log_debug(gc, marking)("Expanding mark stack space: " SIZE_FORMAT "M->" SIZE_FORMAT "M (%s Usage)",
>> 101:                          old_size / M, new_size / M, _high_usage ? "High" : "Low");
> 
> A bit strange to only have "Low" and "High" usage, maybe "Normal" and "High" would be more accurate.

Fixed!

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PR: https://git.openjdk.java.net/jdk/pull/3460