Is it possible monitoring at real time all the syscall under linux?

Question

For example, in a linux-machine there are so many process. Each one is able to use a syscall, but usually few are used. Well, there is a tool or a manner to show when a syscall is used and which is the process associated?

Answer 1

You can use various tools, like strace, ltrace and many other, although I'm not sure you want to trace all processes at the same time.

Normally you'd attach to one process of interest and follow its system calls.