Switch from User Space to Kernel Space
What are the distinct ways the Linux can switch from User Space to Kernel Space & vice-versa?
Expert
There are two situations while Linux can switch from user Space to Kernel Space:-
a) by doing System calls
b) While interrupt comes (to handle interrupt)
c) By executing 128 (0x80 ) instruction or doing sysenter
Linux can switch through kernel Space to User space:-
a. process in kernel mode is preempted.
b. After completion of Interrupt handler / System call
c. Performing sys exit sys call
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