[lkml]   [2003]   [Jan]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: Question about Zone Allocation 2.4.X
On Thu, Jan 02, 2003 at 04:00:34PM -0800, William Lee Irwin III wrote:
> At some point in the past, I wrote:
> >> __get_free_pages() allocates from lowmem (i.e. 0-4GB) only.
> >> Allocate from highmem instead.
> 0-1GB. page_address() will give unpredictable results on highmem GFP masks.

Sounds broken to me.

> There is no GFP mask for it. Port Jens' ZONE_DMA32 or something, or roll
> ZONE_4G on your own if need be.


Looks like we simply jetisioned the concept of a PPL (Physical Pages List)
and went with a zone allocator instead. I'm sure there was a good reason for
it historically. Rolling a separate zone is exactly what I was thinking
when I reviewed the code intially. Question, which files will be affected so when I put this one in, I don't end up breaking the VM and userspace balancing
logic. i.e. Could you point me to Jens' ZONE_DMA32 code as well.



> Bill

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:32    [W:0.040 / U:0.056 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site