Re: [RFC mm][PATCH 4/5] add a lowmem check function

KAMEZAWA Hiroyuki
2009-12-11T00:42:45Z

On Thu, 10 Dec 2009 11:59:11 -0600 (CST)
Christoph Lameter <cl@linux-foundation.org> wrote:

> On Thu, 10 Dec 2009, KAMEZAWA Hiroyuki wrote:
>
> > This patch adds an integer lowmem_zone, which is initialized to -1.
> > If zone_idx(zone) <= lowmem_zone, the zone is lowmem.
>
> There is already a policy_zone in mempolicy.h. lowmem is if the zone
> number is lower than policy_zone. Can we avoid adding another zone
> limiter?
>
My previous version (one month ago) does that. In this set, I tried to use
unified approach for all CONFIG_NUMA/HIGHMEM/flat ones.

Hmm, How about adding following kind of patch after this

#define policy_zone (lowmem_zone + 1)

and remove policy_zone ? I think the name of "policy_zone" implies
"this is for mempolicy, NUMA" and don't think good name for generic use.

Thanks,
-Kame