What does it mean that kernel memory is unswappable?

[avssunil]

Hi All,
I have read that "kernel memory is unswappable,and thus allocating extra memory in the kernel is a far worse thing to do in the kernel than in a user-level program",but we have functions like kfree() and kfree_s() to free the memory from the kernel,so wht do the above statement meant???

Thanks
Sunil

 

[vsomeshwar]

Kernel memory

Yaa kernel memory is un swapable.
Here kernel memory means,memory allocated to core kernel.
How kernel is swapped onto disk ,which(kernel) always must be in memory.

kfree is used to free the memory whtever u acquired dynamically.
Hope I am clear to u.