Tracking page allocation in Zone/Node

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Hi,
 
I wanted to keep track of the page allocation in kernel every time there is an allocation request in kernel.
 
Under "__alloc_pages_nodemask" , I wanted to print the zone/node information from which the page is actually getting allocated.
And then some more stuffs later, based on this.
 
But I am facing some problem and I need some help.
 
On my system I have only DMA zones with 3 nodes as follows:
Node 0, zone      DMA      3      4      6      4      5      0      0      0      0      0      0
Node 1, zone      DMA      8      4      3      8      7      4      2      0      0      0      0
Node 2, zone      DMA     10      2      8      3      2      2      4      1      2      2     28
 
In __alloc_pages_nodemask(...), just before "First Allocation Attempt" [that is before get_page_from_freelist(....)], I wanted to print all the free pages from the "preferred_zone".
Using something like this : 
totalfreepages = zone_page_state(zone, NR_FREE_PAGES);
 
But in my case, there is only one zone (DMA) but 3 nodes.
Thus the above "zone_page_state" always returns totalfreepages only from first Node 0.
But the allocation actually happening from Node 2.
 
How can we point to the zone of Node 2 to get the actual value?
 
If anybody have any ideas please let me know.
 
 
 
Thanks, Regards,
Pintu

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