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linux系统调用——vsyscall和vDSO

vsyscallvDSO段是用于加速Linux中某些系统调用的两种机制。

The "vDSO" (virtual dynamic shared object) is a small shared library
that the kernel automatically maps into the address space of all user-space applications. Applications usually do not need to concern themselves with these details as the vDSO is most commonly called by the C library. This way you can code in the normal way using standard functions and the C library will take care of using any functionality that is available via the vDSO.

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