RFR: 8378675: PPC64: increase instruction cache line size [v3]

[Richard Reingruber]

On Thu, 26 Feb 2026 13:23:04 GMT, David Briemann <dbriemann at openjdk.org> wrote:

>> Set the instruction cache line size for Power to 128 bytes.
>> 
>> Add functions to retrieve the data cache line size and instruction cache line size from the system (AIX & Linux).
>
> David Briemann has updated the pull request incrementally with one additional commit since the last revision:
> 
>   remove comments, fix comparison

src/hotspot/share/runtime/os.hpp line 1080:

> 1078: 
> 1079:   static int get_dcache_line_size();
> 1080:   static int get_icache_line_size();

There seems to be an inconsistency: besides these declarations there are also (unused) declarations in os::Linux and os::Aix. The definitions and references, though, are for these declarations (in class os). Problem with the declarations in os is that not all OSes have implementations.
I think this needs to be resolved.

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PR Review Comment: https://git.openjdk.org/jdk/pull/29918#discussion_r2859822843