Where is linux-vdso.so.1 present on the file system

It’s a virtual shared object that doesn’t have any physical file on the disk; it’s a part of the kernel that’s exported into every program’s address space when it’s loaded. It’s main purpose to make more efficient to call certain system calls (which would otherwise incur performance issues like this). The most prominent being gettimeofday(2). … Read more

What are vdso and vsyscall?

The vsyscall and vDSO segments are two mechanisms used to accelerate certain system calls in Linux. For instance, gettimeofday is usually invoked through this mechanism. The first mechanism introduced was vsyscall, which was added as a way to execute specific system calls which do not need any real level of privilege to run in order … Read more

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