Hi EveryOne!0 See [
] what MS guy is talking about memory allocation , i wonder that they say that process address space can be 4 GB [ 32 bit architecture ] memory with one half for kernel and another for user. Ok! lets say that
you can just use 2 GB with any user application , fine. If i write a kernel mode code which can access user and as well as kernel space then
it should be able to take care of 4 GB. But why Microsoft guys are just
saying NO for big allocations?
It might be possible that lack of addressing flat memory is due to other than OS itself like TLB , HW cache , VM manager architecture etc..1)
Say Windows 32 bit OS for intel architecture.0) Kernel space = 2 1) User space = 2
Total process space = 4 GB.
User mode App. = You have just 2 GB to move around , you keep you data,
routines and string for file mapping here.
Kernel mode code = Ok here you can move around 3 GB.
You can see that our system is consuming min 1 GB [PCB , stack etc.] in
both cases. So we can see that system is spoiling 4 GB [ one process] for every four processes;-)
that is what i'm thinking.