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    SubjectRe: [RFC mm][PATCH 4/5] add a lowmem check function
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    On Thu, Dec 10, 2009 at 5:00 PM, KAMEZAWA Hiroyuki
    <kamezawa.hiroyu@jp.fujitsu.com> wrote:
    > From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
    >
    > 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 <kamezawa.hiroyu@jp.fujitsu.com>
    Reviewed-by: Minchan Kim <minchan.kim@gmail.com>

    I like this than policy_zone version.


    --
    Kind regards,
    Minchan Kim
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