Hi Bithika...
Replies are below... just sharing my thoughts..
> I am trying to read the LRU active list for each zone starting from
> the head of the active list. Following is a code snippet
>
> **********************************************
> show_active(&zone->active_list);
>
>
> void show_active(struct list_head *init_active_list){
> struct list_head *temp;
> struct page *p;
>
> for (temp=init_active_list->next; temp != init_active_list;
> temp=temp->next){
> p = list_entry(temp, struct page, lru);
> }
> }
> *********************************************
>
>
>
> However, when I print page frame numbers obtained from above, I
> notice that the page frame numbers seem to move back and forth in the
> active list and doesnot seem to follow a stack order as maintained by
> the kernel when it adds new pages to the head of the active list.
IMHO that's because in reality pages get allocated (and de-allocated) in
non ordered fashion. Also, nothing prevents you to allocate non
physically contigous memory pages. And that means...well, non ordered
PFN of the pages.
>2. What is the difference between page->lru and
> zone->active_list/zone_inactive_list?
I think the name speaks for itself. "page" is the list of all pages,
while "zone" means pages that belongs on certain zone (DMA, normal,
highmem (doesn't exist in 64-bit machines)). Sorry, I can't give any
ideas about your #1 question.
Somebody CMIIW.
regards,
Mulyadi.
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