On Thu, 3 Feb 2011 13:56:11 +0100
Johannes Weiner [off-list ref] 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 <redacted>

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