diff options
Diffstat (limited to 'mm/oom_kill.c')
| -rw-r--r-- | mm/oom_kill.c | 85 |
1 files changed, 77 insertions, 8 deletions
diff --git a/mm/oom_kill.c b/mm/oom_kill.c index c1850bf991cd..4194b9db0104 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -25,9 +25,11 @@ #include <linux/cpuset.h> #include <linux/module.h> #include <linux/notifier.h> +#include <linux/memcontrol.h> int sysctl_panic_on_oom; int sysctl_oom_kill_allocating_task; +int sysctl_oom_dump_tasks; static DEFINE_SPINLOCK(zone_scan_mutex); /* #define DEBUG */ @@ -50,7 +52,8 @@ 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; @@ -193,7 +196,8 @@ static inline enum oom_constraint constrained_alloc(struct zonelist *zonelist, * * (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; @@ -213,6 +217,8 @@ static struct task_struct *select_bad_process(unsigned long *ppoints) /* skip the init task */ if (is_global_init(p)) continue; + if (mem && !task_in_mem_cgroup(p, mem)) + continue; /* * This task already has access to memory reserves and is @@ -247,7 +253,7 @@ static struct task_struct *select_bad_process(unsigned long *ppoints) 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; @@ -258,6 +264,41 @@ static struct task_struct *select_bad_process(unsigned long *ppoints) } /** + * Dumps the current memory state of all system tasks, excluding kernel threads. + * State information includes task's pid, uid, tgid, vm size, rss, cpu, oom_adj + * score, and name. + * + * If the actual is non-NULL, only tasks that are a member of the mem_cgroup are + * shown. + * + * Call with tasklist_lock read-locked. + */ +static void dump_tasks(const struct mem_cgroup *mem) +{ + struct task_struct *g, *p; + + printk(KERN_INFO "[ pid ] uid tgid total_vm rss cpu oom_adj " + "name\n"); + do_each_thread(g, p) { + /* + * total_vm and rss sizes do not exist for tasks with a + * detached mm so there's no need to report them. + */ + if (!p->mm) + continue; + if (mem && !task_in_mem_cgroup(p, mem)) + continue; + + task_lock(p); + printk(KERN_INFO "[%5d] %5d %5d %8lu %8lu %3d %3d %s\n", + p->pid, p->uid, p->tgid, p->mm->total_vm, + get_mm_rss(p->mm), (int)task_cpu(p), p->oomkilladj, + p->comm); + task_unlock(p); + } while_each_thread(g, p); +} + +/** * Send SIGKILL to the selected process irrespective of CAP_SYS_RAW_IO * flag though it's unlikely that we select a process with CAP_SYS_RAW_IO * set. @@ -334,7 +375,8 @@ static int oom_kill_task(struct task_struct *p) } static int oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order, - unsigned long points, const char *message) + unsigned long points, struct mem_cgroup *mem, + const char *message) { struct task_struct *c; @@ -344,6 +386,8 @@ static int oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order, current->comm, gfp_mask, order, current->oomkilladj); dump_stack(); show_mem(); + if (sysctl_oom_dump_tasks) + dump_tasks(mem); } /* @@ -368,6 +412,31 @@ static int oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order, 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, mem, + "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) @@ -465,7 +534,7 @@ void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask, int order) switch (constraint) { case CONSTRAINT_MEMORY_POLICY: - oom_kill_process(current, gfp_mask, order, points, + oom_kill_process(current, gfp_mask, order, points, NULL, "No available memory (MPOL_BIND)"); break; @@ -475,7 +544,7 @@ void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask, int order) /* Fall-through */ case CONSTRAINT_CPUSET: if (sysctl_oom_kill_allocating_task) { - oom_kill_process(current, gfp_mask, order, points, + oom_kill_process(current, gfp_mask, order, points, NULL, "Out of memory (oom_kill_allocating_task)"); break; } @@ -484,7 +553,7 @@ 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; @@ -495,7 +564,7 @@ retry: panic("Out of memory and no killable processes...\n"); } - if (oom_kill_process(p, gfp_mask, order, points, + if (oom_kill_process(p, gfp_mask, order, points, NULL, "Out of memory")) goto retry; |