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: Balbir Singh <balbir@xxxxxxxxxxxxxxxxxx> --- 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-2.6.22-rc6/include/linux/memcontrol.h~mem-control-out-of-memory 2007-07-05 18:49:35.000000000 -0700 +++ linux-2.6.22-rc6-balbir/include/linux/memcontrol.h 2007-07-05 18:49:35.000000000 -0700 @@ -33,6 +33,7 @@ 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); #else /* CONFIG_CONTAINER_MEM_CONT */ static inline void mm_init_container(struct mm_struct *mm, diff -puN mm/memcontrol.c~mem-control-out-of-memory mm/memcontrol.c --- linux-2.6.22-rc6/mm/memcontrol.c~mem-control-out-of-memory 2007-07-05 18:49:35.000000000 -0700 +++ linux-2.6.22-rc6-balbir/mm/memcontrol.c 2007-07-05 18:49:35.000000000 -0700 @@ -266,6 +266,7 @@ int mem_container_charge(struct page *pa if (res_counter_check_under_limit(&mem->res)) continue; + 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-2.6.22-rc6/mm/oom_kill.c~mem-control-out-of-memory 2007-07-05 18:49:35.000000000 -0700 +++ linux-2.6.22-rc6-balbir/mm/oom_kill.c 2007-07-05 18:49:35.000000000 -0700 @@ -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; @@ -372,6 +382,30 @@ 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) @@ -444,7 +478,7 @@ 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 _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/containers