RFR: 8292194: G1 nmethod entry barrier disarm value wraps around too early

[Albert Mingkun Yang]

On Wed, 10 Aug 2022 14:53:06 GMT, Erik Österlund <eosterlund at openjdk.org> wrote:

> The disarm value for G1 nmethod entry barriers assumes that a concurrent GC can be aborted at most once. However, it can happen many times. In order to avoid ABA issues in the nmethod entry barriers, the limit for wrapping around and reusing numbers needs to be higher. This patch changes that point to INT_MAX as there is little point in using lower values.

Looks good. Though, it's unclear to me why the counter is signed in the first place.

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Marked as reviewed by ayang (Reviewer).

PR: https://git.openjdk.org/jdk/pull/9822