Hi Ingo,
I'm digging around trying to work out how the handover from the
boot-time allocator to the real memory management works.
I'm missing something important though: bootmem.c:free_all_bootmem()
seems to end up just putting all low memory on the freelists. How does
this not put the kernel text+data pages on the freelists? Also,
presumably things allocated in the bootmem allocator remain allocated
for the life of the running kernel?
I'm having a problem in my Xen kernel, in which free_init_pages() ends
up getting a bad_page() warning because pfn 1024 has the PG_buddy bit
set on it, which was unexpected (this page ends up being in the middle
of the initdata section). Page 1024 gets PF_buddy set by
free_all_bootmem_core(), and it becomes an order 10 page.
I presume this is broken because free_all_bootmem_core() shouldn't be
putting the kernel text+data into the freelists, but I don't see how
this is prevented in the normal i386 case. I'm guessing it's done by
something like reserve_bootmem(), but I don't see such a call which
would reserve the kernel itself.
What am I missing?
Thanks,
J
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