Subject: /proc/registry performance problem
From: Joe Buehler <[email-masked]>
To: [email-masked]
Date: Tue, 25 Mar 2003 12:59:57 -0500

Running "ls /proc/registry/HKEY_LOCAL_MACHINE" takes 5 to 10 seconds
on my NT build machine.  Using gdb to step through it, the culprit
is the GetSecurityInfo() call in get_nt_object_attribute().

A google search shows up the following, a bug in GetSecurityInfo() in Windows
that looks like it might be the problem:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnaskdr/html/drgui47.asp

It is also interesting that there is a known problem with GetSecurityInfo()
failing in NT SP4 when a registry key is passed to the function:

http://support.microsoft.com/default.aspx?scid=KB;en-us;q217075

Their workaround involves the use of RegGetKeySecurity(), so perhaps this
is what should be used for registry keys instead of GetSecurityInfo().  I'll
see if I can come up with a patch.
-- 
Joe Buehler

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