Understanding Storage shared between work process

Hi guys,
I was just trying to understand the SAP memory management  and I think I don't really have good understanding of the SAP memory pools that we  can view via ST02 .
Under the Storage shared between work process section we have :
So what are these memory area ?  "Not in pool" seems to have almost 90% of configured SAP pool memory.
Not in Pool seems to be allocated (3.4G here) the moment the SAP instance is started.
Can you please explain the concept of the memory Pools in  the SAP? I have vague idea but I do not really understand this.
I think when we increase the  various SAP buffers (like program,scree,Export/import), we increase these pools...
Can you please help me link these pools with the four main memory areas of the SAP:
1. Roll
2.Extended
3.Page
4.Heap
or are they entirely different?
As you can see I badly need to tune my SAP buffer memory ! Before increasing these buffers I need to understand if we have sufficient memory left in the box.
regards,
Rakesh

Hello back,
I have read few other posts and help.sap.com for more clarity on the memory management. I am getting the hang of it but I would like  you to explain this query.
I have just rebooted our LINUX box which has two application server each for CRM and R3.
However, I couldn't understand the current  memory  usage that is shown by free -,m command at OS level and the sum I get from the ST02 txn for each of the app servers.
see the scraancap  below:
Here at os level, used memory (all physical)is around 6GB and no SWAP memory:
This linux box has no other applications running other than two app servers as I mentioned.
And when I check the ST02 current memory in both the app server :
If we consider only extended memory , the sum of the current usage is about 4G+6.7G=10.7G
and I assume they are allocated using physical memory(Could be virtual=physical+SWAP) which clearly shows that far more than the current memory used shown at OS level , here around 6G...
So that's my confusion,would really appreciate if someone can help me understand this.
Regards,
Rakesh

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