RFR: 8259380: Correct pretouch chunk size to cap with actual page size

[Patrick Zhang]

On Fri, 8 Jan 2021 11:06:27 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

>> Thanks for finding and reporting this issue and even providing a patch.
>> 
>> After having looked at the issue we (in the Oracle GC team) think this problem is serious enough to actually go into JDK16. Since backporting after having this pushed to some (this) repo is some extra effort, would you mind closing this PR here on openjdk/jdk and reopening a new one on openjdk/jdk16?
>> 
>> It will then be automatically forward ported to this repo. Not only is backporting some additional effort, there is concern that it won't make it into jdk16 otherwise - Jan 14 is cutoff date for bugs of this seriousness, and we'd need to get an exception for this otherwise.
>> 
>> As one of the persons typically triaging new issues in the bug tracker, I would also like to ask you to not open new issues immediately. We are looking at these issues three times a week, and if you open them yourselves, issues might not be handled correctly (i.e. like in this case immediately put into openjdk/jdk16). You can still create a PR and everything even if an issue is in "New" state.
>> 
>> I'll start looking at your change immediately.
>> 
>> Thanks,
>>   Thomas
>
> Fwiw, the most appropriate label for this change would probably be "hotspot-gc", but "hotspot" is fine too.

Understood, I will do this today.
 
> would you mind closing this PR here on openjdk/jdk and reopening a new one on openjdk/jdk16?

OK. Can I use the same tracker (8259380 for the PR to jdk16?

> As one of the persons typically triaging new issues in the bug tracker, I would also like to ask you to not open new issues immediately.

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PR: https://git.openjdk.java.net/jdk/pull/1978