RFR: 8263476: Use reserved memory for stack guard pages [v3]

[Zhengyu Gu]

On Wed, 6 Aug 2025 20:28:49 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> > Current create_stack_guard_pages() implementation calls os::commit_memory(addr, size, !ExecMem) to setup the protection.
> 
> Which `create_stack_guard_pages` are you referring to, in `StackOverflow` or `os`?
> 
> `StackOverflow::create_stack_guard_pages` invokes `os::create_stack_guard_pages` for some preparation work (optional for some platforms) and `os::guard_memory` for protection setup.
> 
> `os::commit_memory` is not directly related to memory protection.

Ah, okay.  I believe I wanted to get rid of this `commit_memory` call which has the undesirable side-effort to NMT. 
BTW, do you need the `reserve_memory()`, are the guard pages already reserved as part of stack?

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PR Review Comment: https://git.openjdk.org/jdk/pull/26571#discussion_r2263555660