From: Pavel Emelianov Out of memory handling for cgroups over their limit. A task from the cgroup 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 Signed-off-by: Balbir Singh Cc: Paul Menage Cc: Peter Zijlstra Cc: "Eric W. Biederman" Cc: Nick Piggin Cc: Kirill Korotaev Cc: Herbert Poetzl Cc: David Rientjes Cc: Vaidyanathan Srinivasan DESC memory-controller-oom-handling-v7-vs-oom-killer-stuff EDESC From: Andrew Morton Cc: Pavel Emelianov Cc: Balbir Singh Cc: Paul Menage Cc: Peter Zijlstra Cc: "Eric W. Biederman" Cc: Nick Piggin Cc: Kirill Korotaev Cc: Herbert Poetzl Cc: David Rientjes Cc: Vaidyanathan Srinivasan Signed-off-by: Andrew Morton --- include/linux/memcontrol.h | 1 mm/memcontrol.c | 1 mm/oom_kill.c | 43 +++++++++++++++++++++++++++++++---- 3 files changed, 41 insertions(+), 4 deletions(-) diff -puN include/linux/memcontrol.h~memory-controller-oom-handling-v7 include/linux/memcontrol.h --- a/include/linux/memcontrol.h~memory-controller-oom-handling-v7 +++ a/include/linux/memcontrol.h @@ -39,6 +39,7 @@ extern unsigned long mem_cgroup_isolate_ int mode, struct zone *z, struct mem_cgroup *mem_cont, int active); +extern void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask); static inline void mem_cgroup_uncharge_page(struct page *page) { diff -puN mm/memcontrol.c~memory-controller-oom-handling-v7 mm/memcontrol.c --- a/mm/memcontrol.c~memory-controller-oom-handling-v7 +++ a/mm/memcontrol.c @@ -323,6 +323,7 @@ int mem_cgroup_charge(struct page *page, } css_put(&mem->css); + mem_cgroup_out_of_memory(mem, GFP_KERNEL); goto free_pc; } diff -puN mm/oom_kill.c~memory-controller-oom-handling-v7 mm/oom_kill.c --- a/mm/oom_kill.c~memory-controller-oom-handling-v7 +++ a/mm/oom_kill.c @@ -25,6 +25,7 @@ #include #include #include +#include int sysctl_panic_on_oom; int sysctl_oom_kill_allocating_task; @@ -50,7 +51,8 @@ static DEFINE_SPINLOCK(zone_scan_mutex); * 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_cgroup *mem) { unsigned long points, cpu_time, run_time, s; struct mm_struct *mm; @@ -63,6 +65,13 @@ unsigned long badness(struct task_struct return 0; } +#ifdef CONFIG_CGROUP_MEM_CONT + if (mem != NULL && mm->mem_cgroup != mem) { + task_unlock(p); + return 0; + } +#endif + /* * The memory size of the process is the basis for the badness. */ @@ -193,7 +202,8 @@ static inline enum oom_constraint constr * * (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_cgroup *mem) { struct task_struct *g, *p; struct task_struct *chosen = NULL; @@ -247,7 +257,7 @@ 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; @@ -368,6 +378,31 @@ static int oom_kill_process(struct task_ return oom_kill_task(p); } +#ifdef CONFIG_CGROUP_MEM_CONT +void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask) +{ + unsigned long points = 0; + struct task_struct *p; + + cgroup_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, gfp_mask, 0, points, + "Memory cgroup out of memory")) + goto retry; +out: + rcu_read_unlock(); + cgroup_unlock(); +} +#endif + static BLOCKING_NOTIFIER_HEAD(oom_notify_list); int register_oom_notifier(struct notifier_block *nb) @@ -484,7 +519,7 @@ 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; _