RFR: 8368633: (fs) Path.toRealPath(NOFOLLOW_LINKS) very slow on macOS [v2]

[Brian Burkhalter]

On Mon, 13 Oct 2025 16:06:39 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

>> src/java.base/unix/classes/sun/nio/fs/UnixPath.java line 959:
>> 
>>> 957:             try (DirectoryStream<Path> entries = new UnixDirectoryStream(path, dp, filter)) {
>>> 958:                 // compare path bytes until a match is found
>>> 959:                 List<Path> notMatched = new ArrayList<Path>();
>> 
>> Can you try a version that doesn't collect but instead opens a new UnixDirectoryStream for the second/slow scan? I'm asking because the directory have many thousands of entries so there is a risk of OOME here.
>
>> Can you try a version that doesn't collect but instead opens a new UnixDirectoryStream for the second/slow scan?
> 
> I was not sure of that either. I'll change it.

So changed in 88b3341.

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PR Review Comment: https://git.openjdk.org/jdk/pull/27709#discussion_r2427436218