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Explains: Linux linux-gate.so.1 Library / Dynamic Shared Object [ vdso ]

I'm using the ldd command to get information about /usr/local/nginx/sbin/nginx binary and I see linux-gate.so.1 library. However, I'm unable to find out this file anywhere on the system? What is linux-gate.so.1 and how do I copy this file?
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Linux: AMD Phenom II and AMD Athlon II CPU Change Frequency On All Logical Cores

I've AMD Athlon II processors based server and it does not change frequency on all logical cores under CentOS version 5.5 or RHEL Linux. How do I fix this problem?
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Linux Find Out CPU Support 36-bit Physical Addressing Or Not

Q. Physical Address Extension (PAE) refers to a feature of x86 and x86-64 processors that allows more than 4G bytes of physical memory to be used in 32-bit systems. The x86 architecture presently uses only 36 bits out of 52 bits possible. On x86-64 processors, PAE is obligatory in native long mode; currently 40 bits are used out of 52 bits possible. How do I find out if my Linux kernel supports 36-bit or more physical addressing?
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