[Bug 230491] stat(1): Improve performance with getpwuid() and getgrgid() caching

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230491

Conrad Meyer <cem at freebsd.org> changed:

           What    |Removed                     |Added
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                 CC|                            |cem at freebsd.org

--- Comment #1 from Conrad Meyer <cem at freebsd.org> ---
Patch looks functionally ok to me (works because stat is a single-threaded
program); has some style issues.

It's unclear to me if we want to add caching to every individual tool accessing
these databases, or if the caching should just happen in libc.

One other concern that the thought of caching in libc raises is: how do we
handle cache invalidation?  Obviously we don't care if a user/group change
races a running but ultimately bounded program like stat(1) across many files,
but we probably do care if a daemon never sees renamed or numbered ids.

Btw, it seems such caching is already implemented in libc via the NS_CACHING
option.

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