Approach to the RSS
Hello,
I came up with the following approach.
I went through the code and the book named "Implementation of free BSD system"
for some detail understanding.
There is a vmspace structure embedding vm_map structure. The vm_map structure in
turn points to the head of vm_map_entry.
The vm_map_entry points to the vm_object.
The structure vm_object contains the reference count of the number of
vm_map_entry or other objects referencing it.
Also, the vm_object structure has count of the number of resident pages.
struct vm_object {
.....
int ref_count;
.....
int resident_page_count;
.....
};
Suppose their are 2 process, proc_A and proc_B. proc_A has three references to a
object and proc_B has 2.
Thus, now their are five references and if we divide the resident_page_count by
ref_count, we can then multiply it by 3 to get/calculate proportional RSS for
proc_A and multiplying by 2 will give it for proc_B.
Thus, we can get it without going very deep into the convoluted chain. And which
will be fast.
If you guys think its a feasible solution, I can carry it and test it. After the
testing if the results are weird we can just move forward till the depth of the
chain.
Thanks,
Pratyush Kshirsagar.
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