Hi Aubery!
Aubrey wrote:
Hi Nick,
Thanks for your reply again, ;-).
On 12/19/06, Nick Piggin <[email protected]> wrote:
This should not happen because the pages are checked to ensure they are
from the same zone before merging.
How? page_is_buddy() only check if the buddy has the buddy flag and
has the same order.
Where can I find the same zone is checked?
Ah OK, you're using 2.6.16? Later kernels have a check for this. I
guess you could backport it?
What kind of system do you have? What is the dmesg and the .config?
I'm using the blackfin uclinux. dmesg and .config is attached.
It could be that the zones are not properly aligned and
CONFIG_HOLES_IN_ZONE
is not set.
I changed the code in paging_init(), see below:
-----------------------------------------
#if 0
zones_size[ZONE_DMA] = (end_mem - PAGE_OFFSET) >>
PAGE_SHIFT;
zones_size[ZONE_NORMAL] = 0;
#else
zones_size[ZONE_DMA] = (end_mem/2 - PAGE_OFFSET) >>
PAGE_SHIFT;
zones_size[ZONE_NORMAL] = (end_mem/2 - PAGE_OFFSET) >>
PAGE_SHIFT;
#endif
-----------------------------------------
This is only what I did the change. I also suspect the zones are not
properly aligned, But how to align it? I think our system doesn't need
CONFIG_HOLES_IN_ZONE.
That's right. I guess you can either align your zone sizes (must be
aligned to MAX_ORDER size), or add the zone check in page_is_buddy.
Hope that works.
Nick
--
SUSE Labs, Novell Inc.
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