Hi Peter ...
In LDD3, I read that "worker queue does not have user space, but does
have a process context."
I am quite confused here - as I thought that given a process context,
u can get the mm_struct address space defined per task, and therefore
derive the userspace memory inside the linked list of memory?
Therefore, the sentence from LDD3 quoted above implied that there must
be some processes that does NOT have any userspace component -
correct? And examples or these are?
Worker thread ( I believe it's the correct term) is an example of kernel
thread. Every kernel thread itself is a kind of process, thus it has
process context. Technically, it means it has task_struct like normal
process, but borrows the mm_struct of the last running process.
Why it is said it doesn't have user space? Two things:
1. It doesn't have its own mm_struct
2. It doesn't access user space. Kernel threads only operate and access
kernel address space.
regards,
Mulyadi
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