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zk/VirtualMemory.md
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@ -12,7 +12,7 @@ memory capacity of a machine that is presented to user space for its memory
operations. operations.
When an OS implements virtual memory, [processes](./Processes.md) in When an OS implements virtual memory, [processes](./Processes.md) in
[user space](./User_Space.md) cannot directly read or write to the actual [user space](./User_Space.md) cannot directly read or write to the physical
memory. Instead they execute memory operations against virtual memory and the memory. Instead they execute memory operations against virtual memory and the
[kernel](./The_kernel.md) translates these into the actual operations against [kernel](./The_kernel.md) translates these into the actual operations against
the memory hardware. the memory hardware.
@ -43,15 +43,19 @@ machine:
_How Computers Really Work_ (2021) p.206 _How Computers Really Work_ (2021) p.206
Furthermore the kernel itself utilises virtual memory. The difference with ## Virtual memory and the kernel
kernel virtual memory is that it has a different range of virtual addresses to
work with than user space virtual memory.
Also, unlike user address space, the kernel has access to everything running in The kernel itself utilises virtual memory. The kernel virtual memory has a
kernel address space. Processes in user address space are partitioned from each different range of virtual addresses to work with than user space virtual
other with separate address spaces that cannot interact. memory.
Unlike user space virtual memory, the kernel has access to everything running in
kernel address space whereas processes in user address space are partitioned
from each other with separate address spaces that cannot interact.
// Next: the kernel also uses virtual memory however isn't also responsible for // Next: the kernel also uses virtual memory however isn't also responsible for
the appportioning of virtual memory. Confused. the appportioning of virtual memory. Confused.
// See Claude convo ![Virtual memory diagram](/img/virtual-memory-diagram.jpg) // See Claude convo
![Virtual memory diagram](/img/virtual-memory-diagram.jpg)