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SubjectRe: [RFC mm][PATCH 4/5] add a lowmem check function
On Thu, Dec 10, 2009 at 5:00 PM, KAMEZAWA Hiroyuki
<> wrote:
> From: KAMEZAWA Hiroyuki <>
> Final purpose of this patch is for improving oom/memoy shortage detection
> better. In general there are OOM cases that lowmem is exhausted. What
> this lowmem means is determined by the situation, but in general,
> limited amount of memory for some special use is lowmem.
> This patch adds an integer lowmem_zone, which is initialized to -1.
> If zone_idx(zone) <= lowmem_zone, the zone is lowmem.
> This patch uses simple definition that the zone for special use is the lowmem.
> Not taking the amount of memory into account.
> For example,
>  - if HIGHMEM is used, NORMAL is lowmem.
>  - If the system has both of NORMAL and DMA32, DMA32 is lowmem.
>  - When the system consists of only one zone, there are no lowmem.
> This will be used for lowmem accounting per mm_struct and its information
> will be used for oom-killer.
> Changelog: 2009/12/09
>  - stop using policy_zone and use unified definition on each config.
> Signed-off-by: KAMEZAWA Hiroyuki <>
Reviewed-by: Minchan Kim <>

I like this than policy_zone version.

Kind regards,
Minchan Kim
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