Hi David,
Zitat von David McCullough <[EMAIL PROTECTED]>:
Some likely ones to consider are:
arch/mips/mm/init.c: paging_init
arch/x86/kernel/setup_32.c: zone_sizes_init
They all seem to call:
free_area_init_nodes(max_zone_pfns);
Though you may need to make sure the m68knommu code is doing the right
thing in this space,
thanks for the hint. I had a look at especially arch/mips/mm/init.c.
In case of CONFIG_FLATMEM, which I am using as well, they make a call
to free_area_init(). I am doing exactly the same.
The zones get initialized as follows:
---snip---
unsigned long zones_size[MAX_NR_ZONES] = { 0, };
zones_size[ZONE_DMA] = (16*1024*1024) >> PAGE_SHIFT;
zones_size[ZONE_NORMAL] = (48*1024*1024) >> PAGE_SHIFT;
free_area_init(zones_size);
---snap---
As far as I can see from the kernel messages, posted in a previous
mail, the zones seem to get allocated fine.
---snip---
DMA free:0kB min:252kB low:312kB high:376kB active:0kB inactive:0kB
present:16256kB pages_scanned:0 all_unreclaimable? yes
lowmem_reserve[]: 0 47
Normal free:45212kB min:760kB low:948kB high:1140kB active:0kB
inactive:0kB present:48768kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0
DMA: 0*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB
0*2048kB 0*4096kB = 0kB
Normal: 1*4kB 1*8kB 1*16kB 2*32kB 1*64kB 0*128kB 0*256kB 0*512kB
0*1024kB 0*2048kB 11*4096kB = 45212kB
16384 pages of RAM
11306 free pages
4671 reserved pages
--snap---
The messages above show that the slab allocator for the DMA zone
doesn't find any available memory chunks. But I see a message about
16256kB DMA memory present as well!?!?!
Might it have something to do with this "4671 reserved pages"? I have
the feeling that I have to free these pages properly so that they are
available for the slab allocator. Although I had a look at some other
code in "arch/"-directory I couldn't make out how to solve this issue.
As soon as I do a kmalloc() to DMA_ZONE I run into troubles.
With best regards,
Markus
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