RFR: 8252221: Use multiple workers for Parallel GC pre-touching [v4]

[Kim Barrett]

On Tue, 13 Oct 2020 13:41:32 GMT, Amit Pawar <github.com+71302734+amitdpawar at openjdk.org> wrote:

>> Please review this change.
>
> Amit Pawar has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Updated the code as per the review.

new files "preTouchTask.[ch]pp" should be "pretouchTask.[ch]pp"

src/hotspot/share/gc/shared/preTouchTask.cpp line 66:

> 64:                             size_t page_size, WorkGang* pretouch_gang) {
> 65:   PretouchTask task(task_name, start_address, end_address, page_size);
> 66:   size_t total_bytes = (end_address - start_address);

Should be using pointer_delta here.

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Changes requested by kbarrett (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/180