Hi David,
Zitat von David McCullough <[EMAIL PROTECTED]>:
My understanding of the zones says is that you can do what you are trying
to do. I seem to recall that if you get low on normal memory the system
may dip into the DMA pool.
well, I reserved a 16 MByte DMA zone and declared it as non-cacheable.
The Linux kernel is compiled for being located at address 0x01000000,
which is the first address after the DMA zone. However, when I boot my
system now the first attempt to allocate some memory from the DMA zone
results in the following:
---snip---
swapper: page allocation failure. order:0, mode:0x4001
Stack from 0124edbc:
bla bla bla
Call Trace:
bla bla bla
Mem-info:
DMA per-cpu:
CPU 0: Hot: hi: 0, btch: 1 usd: 0 Cold: hi: 0, btch:
1 usd: 0
Normal per-cpu:
CPU 0: Hot: hi: 6, btch: 1 usd: 0 Cold: hi: 2, btch:
1 usd: 0
Active:0 inactive:0 dirty:0 writeback:0 unstable:0 free:11304 slab:401
mapped:0 pagetables:0
DMA free:0kB min:252kB low:312kB high:376kB active:0kB inactive:0kB
present:16256kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 47
Normal free:45216kB 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: 0*4kB 0*8kB 0*16kB 1*32kB 0*64kB 1*128kB 0*256kB 0*512kB
0*1024kB 0*2048kB 11*4096kB = 45216kB
16384 pages of RAM
11305 free pages
4661 reserved pages
0 pages shared
0 pages swap cached
---snap---
From the messages above I can see that there are no free pages in the
DMA zone anymore, although it's the first memory request to this zone.
Am I missing something fundamentally?
With best regards,
Markus Franke
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