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    SubjectRe: [patch 2/2] memcg: simplify the way memory limits are checked
    On Thu, 3 Feb 2011 13:56:11 +0100
    Johannes Weiner <hannes@cmpxchg.org> wrote:

    > Since transparent huge pages, checking whether memory cgroups are
    > below their limits is no longer enough, but the actual amount of
    > chargeable space is important.
    >
    > To not have more than one limit-checking interface, replace
    > memory_cgroup_check_under_limit() and memory_cgroup_check_margin()
    > with a single memory_cgroup_margin() that returns the chargeable space
    > and leaves the comparison to the callsite.
    >
    > Soft limits are now checked the other way round, by using the already
    > existing function that returns the amount by which soft limits are
    > exceeded: res_counter_soft_limit_excess().
    >
    > Also remove all the corresponding functions on the res_counter side
    > that are now no longer used.
    >
    > Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>

    Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>



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