I am going through the memory initialization code in linux kernel, and I
can see the number of free pages for each order and migration type for the
each memory zone in a memory node is set to 0.
static void __meminit zone_init_free_lists(struct zone *zone){int order, t;
for_each_migratetype_order(order, t) {
INIT_LIST_HEAD(&zone->free_area[order].free_list[t]);
zone->free_area[order].nr_free = 0;}}
I am not able to figure out how the list is set to the proper state, as in
which order has how many default pages to to start with, or we start with
all entries in the highest order.
In the book, I read the following:
The number of free pages (nr_free) is still currently defined as 0, and
this obviously does not reflect the true situation. The correct value is
not set until the bootmem allocator is disabled and normal buddy allocation
comes into effect.
Can someone point to the actual location where this part is set to the
default starting value?
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