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    Subject[RFC][PATCH 1/4] Memory controller soft limit documentation (v2)
    Add documentation for soft limit feature support.

    From: Balbir Singh <>

    Signed-off-by: Balbir Singh <>

    Documentation/cgroups/memory.txt | 28 +++++++++++++++++++++++++++-
    1 files changed, 27 insertions(+), 1 deletions(-)

    diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
    index a98a7fe..6e6ef41 100644
    --- a/Documentation/cgroups/memory.txt
    +++ b/Documentation/cgroups/memory.txt
    @@ -360,7 +360,33 @@ cgroups created below it.

    NOTE2: This feature can be enabled/disabled per subtree.

    -7. TODO
    +7. Soft limits
    +Soft limits allow for greater sharing of memory. The idea behind soft limits
    +is to allow control groups to use as much of the memory as needed, provided
    +a. There is no memory contention
    +b. They do not exceed their hard limit
    +When the system detects memory contention (through do_try_to_free_pages(),
    +while allocating), control groups are pushed back to their soft limits if
    +possible. If the soft limit of each control group is very high, they are
    +pushed back as much as possible to make sure that one control group does not
    +starve the others.
    +7.1 Interface
    +Soft limits can be setup by using the following commands (in this example we
    +assume a soft limit of 256 megabytes)
    +# echo 256M > memory.soft_limit_in_bytes
    +If we want to change this to 1G, we can at any time use
    +# echo 1G > memory.soft_limit_in_bytes
    +8. TODO

    1. Add support for accounting huge pages (as a separate controller)
    2. Make per-cgroup scanner reclaim not-shared pages first

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