diff options
| -rw-r--r-- | include/linux/cpuset.h | 6 | ||||
| -rw-r--r-- | kernel/cpuset.c | 34 | ||||
| -rw-r--r-- | mm/oom_kill.c | 3 |
3 files changed, 43 insertions, 0 deletions
diff --git a/include/linux/cpuset.h b/include/linux/cpuset.h index 8e540d32c9f..51ea2bdea0f 100644 --- a/include/linux/cpuset.h +++ b/include/linux/cpuset.h @@ -78,6 +78,8 @@ extern int current_cpuset_is_being_rebound(void); extern void rebuild_sched_domains(void); +extern void cpuset_print_task_mems_allowed(struct task_struct *p); + #else /* !CONFIG_CPUSETS */ static inline int cpuset_init_early(void) { return 0; } @@ -159,6 +161,10 @@ static inline void rebuild_sched_domains(void) partition_sched_domains(1, NULL, NULL); } +static inline void cpuset_print_task_mems_allowed(struct task_struct *p) +{ +} + #endif /* !CONFIG_CPUSETS */ #endif /* _LINUX_CPUSET_H */ diff --git a/kernel/cpuset.c b/kernel/cpuset.c index 39c1a4c1c5a..345ace5117d 100644 --- a/kernel/cpuset.c +++ b/kernel/cpuset.c @@ -240,6 +240,17 @@ static struct cpuset top_cpuset = { static DEFINE_MUTEX(callback_mutex); /* + * cpuset_buffer_lock protects both the cpuset_name and cpuset_nodelist + * buffers. They are statically allocated to prevent using excess stack + * when calling cpuset_print_task_mems_allowed(). + */ +#define CPUSET_NAME_LEN (128) +#define CPUSET_NODELIST_LEN (256) +static char cpuset_name[CPUSET_NAME_LEN]; +static char cpuset_nodelist[CPUSET_NODELIST_LEN]; +static DEFINE_SPINLOCK(cpuset_buffer_lock); + +/* * This is ugly, but preserves the userspace API for existing cpuset * users. If someone tries to mount the "cpuset" filesystem, we * silently switch it to mount "cgroup" instead @@ -2356,6 +2367,29 @@ int cpuset_mems_allowed_intersects(const struct task_struct *tsk1, return nodes_intersects(tsk1->mems_allowed, tsk2->mems_allowed); } +/** + * cpuset_print_task_mems_allowed - prints task's cpuset and mems_allowed + * @task: pointer to task_struct of some task. + * + * Description: Prints @task's name, cpuset name, and cached copy of its + * mems_allowed to the kernel log. Must hold task_lock(task) to allow + * dereferencing task_cs(task). + */ +void cpuset_print_task_mems_allowed(struct task_struct *tsk) +{ + struct dentry *dentry; + + dentry = task_cs(tsk)->css.cgroup->dentry; + spin_lock(&cpuset_buffer_lock); + snprintf(cpuset_name, CPUSET_NAME_LEN, + dentry ? (const char *)dentry->d_name.name : "/"); + nodelist_scnprintf(cpuset_nodelist, CPUSET_NODELIST_LEN, + tsk->mems_allowed); + printk(KERN_INFO "%s cpuset=%s mems_allowed=%s\n", + tsk->comm, cpuset_name, cpuset_nodelist); + spin_unlock(&cpuset_buffer_lock); +} + /* * Collection of memory_pressure is suppressed unless * this flag is enabled by writing "1" to the special diff --git a/mm/oom_kill.c b/mm/oom_kill.c index e5f50cfdca4..6b9e758c98a 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -392,6 +392,9 @@ static int oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order, printk(KERN_WARNING "%s invoked oom-killer: " "gfp_mask=0x%x, order=%d, oomkilladj=%d\n", current->comm, gfp_mask, order, current->oomkilladj); + task_lock(current); + cpuset_print_task_mems_allowed(current); + task_unlock(current); dump_stack(); show_mem(); if (sysctl_oom_dump_tasks) |