[Bug 253871] top generates nslcd 'Size limit exceeded' on userid->username mapping

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253871

            Bug ID: 253871
           Summary: top generates nslcd 'Size limit exceeded' on
                    userid->username mapping
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: christian.schaettin at hostpoint.ch

/usr/bin/top always asks for all usernames on userid->username mapping. For
performance reason. See: root/contrib/top/username.c (L166)

But if you have an LDAP infrastructure with thousands of users than the request
for all users will end up in:

nslcd[35022]: [99e99b] <passwd(all)> ldap_result() failed: Size limit exceeded

Therefor it would be better if the uid->username mapping is only for used
uid's.

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