As I know linux kernel threads do not have their own address space as compare to user space threads/process. Kernel threads do not context switch into user space but kernel threads are schedulable and preemptable. So my question is that if the kernel thread do not have the address space then how the switching/preemption of kernel thread works?
How the scheduling or preemption of Linux kernel thread works?
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Kernel threads basically executes a function. They are created using the
kernel_thread()
function which receives the address of the function to execute, the arguments to that function and some clone flags as arguments.This function essentially invokes a common
do_fork()
passing it the address of the Kernel Mode stack wherecopy_thread()
will find the initial values of the CPU registers for the kernel thread.Basically
kernel_thread()
builds the stack in a way that:ebx
andedx
register will be set bycopy_thread()
to the valuesfn
andarg
eip
will be set to a small routine that will load the arguments andcall fn
This way the new kernel thread starts executing
fn(arg)
.As you can see, a kernel thread knows about what code to execute by the address of
fn
. This function normally is already defined somewhere inside the kernel, by settingeip
to point there, this way the kernel thread knows the instructions to execute. No need fortext segment
because there's no need to map an executable file to a memory region.