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    Subject[-mm PATCH 7/9] Memory controller OOM handling (v4)

    From: Pavel Emelianov <xemul@openvz.org>

    Out of memory handling for containers over their limit. A task from the
    container over limit is chosen using the existing OOM logic and killed.

    TODO:
    1. As discussed in the OLS BOF session, consider implementing a user
    space policy for OOM handling.

    Signed-off-by: Pavel Emelianov <xemul@openvz.org>

    Signed-off-by: <balbir@linux.vnet.ibm.com>
    ---

    include/linux/memcontrol.h | 1 +
    mm/memcontrol.c | 1 +
    mm/oom_kill.c | 42 ++++++++++++++++++++++++++++++++++++++----
    3 files changed, 40 insertions(+), 4 deletions(-)

    diff -puN include/linux/memcontrol.h~mem-control-out-of-memory include/linux/memcontrol.h
    --- linux-2.6.23-rc1-mm1/include/linux/memcontrol.h~mem-control-out-of-memory 2007-07-28 01:12:50.000000000 +0530
    +++ linux-2.6.23-rc1-mm1-balbir/include/linux/memcontrol.h 2007-07-28 01:12:50.000000000 +0530
    @@ -38,6 +38,7 @@ extern unsigned long mem_container_isola
    int mode, struct zone *z,
    struct mem_container *mem_cont,
    int active);
    +extern void mem_container_out_of_memory(struct mem_container *mem);

    static inline void mem_container_uncharge_page(struct page *page)
    {
    diff -puN mm/memcontrol.c~mem-control-out-of-memory mm/memcontrol.c
    --- linux-2.6.23-rc1-mm1/mm/memcontrol.c~mem-control-out-of-memory 2007-07-28 01:12:50.000000000 +0530
    +++ linux-2.6.23-rc1-mm1-balbir/mm/memcontrol.c 2007-07-28 01:12:50.000000000 +0530
    @@ -299,6 +299,7 @@ int mem_container_charge(struct page *pa
    }

    css_put(&mem->css);
    + mem_container_out_of_memory(mem);
    goto free_mp;
    }

    diff -puN mm/oom_kill.c~mem-control-out-of-memory mm/oom_kill.c
    --- linux-2.6.23-rc1-mm1/mm/oom_kill.c~mem-control-out-of-memory 2007-07-28 01:12:50.000000000 +0530
    +++ linux-2.6.23-rc1-mm1-balbir/mm/oom_kill.c 2007-07-28 01:12:50.000000000 +0530
    @@ -24,6 +24,7 @@
    #include <linux/cpuset.h>
    #include <linux/module.h>
    #include <linux/notifier.h>
    +#include <linux/memcontrol.h>

    int sysctl_panic_on_oom;
    /* #define DEBUG */
    @@ -47,7 +48,8 @@ int sysctl_panic_on_oom;
    * of least surprise ... (be careful when you change it)
    */

    -unsigned long badness(struct task_struct *p, unsigned long uptime)
    +unsigned long badness(struct task_struct *p, unsigned long uptime,
    + struct mem_container *mem)
    {
    unsigned long points, cpu_time, run_time, s;
    struct mm_struct *mm;
    @@ -60,6 +62,13 @@ unsigned long badness(struct task_struct
    return 0;
    }

    +#ifdef CONFIG_CONTAINER_MEM_CONT
    + if (mem != NULL && mm->mem_container != mem) {
    + task_unlock(p);
    + return 0;
    + }
    +#endif
    +
    /*
    * The memory size of the process is the basis for the badness.
    */
    @@ -204,7 +213,8 @@ static inline int constrained_alloc(stru
    *
    * (not docbooked, we don't want this one cluttering up the manual)
    */
    -static struct task_struct *select_bad_process(unsigned long *ppoints)
    +static struct task_struct *select_bad_process(unsigned long *ppoints,
    + struct mem_container *mem)
    {
    struct task_struct *g, *p;
    struct task_struct *chosen = NULL;
    @@ -258,7 +268,7 @@ static struct task_struct *select_bad_pr
    if (p->oomkilladj == OOM_DISABLE)
    continue;

    - points = badness(p, uptime.tv_sec);
    + points = badness(p, uptime.tv_sec, mem);
    if (points > *ppoints || !chosen) {
    chosen = p;
    *ppoints = points;
    @@ -370,6 +380,30 @@ static int oom_kill_process(struct task_
    return oom_kill_task(p);
    }

    +#ifdef CONFIG_CONTAINER_MEM_CONT
    +void mem_container_out_of_memory(struct mem_container *mem)
    +{
    + unsigned long points = 0;
    + struct task_struct *p;
    +
    + container_lock();
    + rcu_read_lock();
    +retry:
    + p = select_bad_process(&points, mem);
    + if (PTR_ERR(p) == -1UL)
    + goto out;
    +
    + if (!p)
    + p = current;
    +
    + if (oom_kill_process(p, points, "Memory container out of memory"))
    + goto retry;
    +out:
    + rcu_read_unlock();
    + container_unlock();
    +}
    +#endif
    +
    static BLOCKING_NOTIFIER_HEAD(oom_notify_list);

    int register_oom_notifier(struct notifier_block *nb)
    @@ -442,7 +476,7 @@ retry:
    * Rambo mode: Shoot down a process and hope it solves whatever
    * issues we may have.
    */
    - p = select_bad_process(&points);
    + p = select_bad_process(&points, NULL);

    if (PTR_ERR(p) == -1UL)
    goto out;
    _
    --
    Warm Regards,
    Balbir Singh
    Linux Technology Center
    IBM, ISTL
    -
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