RFR: 8265612: revise the help info for jmap histo command

Wed Apr 21 05:22:04 UTC 2021

On Wed, 21 Apr 2021 02:18:12 GMT, Lin Zang <lzang at openjdk.org> wrote:

> This PR  revise the help message of the `parallel=[N]` option of command `jmap -histo`. It mainly comes from the discussion at  https://github.com/openjdk/jdk/pull/2379#issuecomment-782609582  and https://github.com/openjdk/jdk/pull/2261#issuecomment-823623186.

The changes look good, but in the review for PR 2261 I suggested you also move some other minor edits in JMap.java from that PR to this one:

https://github.com/openjdk/jdk/pull/2261/files#r617063125

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Marked as reviewed by cjplummer (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/3598