diff options
Diffstat (limited to 'kernel/cgroup.c')
| -rw-r--r-- | kernel/cgroup.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c index d65a1246829f..ca38db223f84 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -44,6 +44,9 @@ #include <linux/string.h> #include <linux/sort.h> #include <linux/kmod.h> +#include <linux/delayacct.h> +#include <linux/cgroupstats.h> + #include <asm/atomic.h> static DEFINE_MUTEX(cgroup_mutex); @@ -1766,6 +1769,58 @@ static int pid_array_load(pid_t *pidarray, int npids, struct cgroup *cont) return n; } +/** + * Build and fill cgroupstats so that taskstats can export it to user + * space. + * + * @stats: cgroupstats to fill information into + * @dentry: A dentry entry belonging to the cgroup for which stats have + * been requested. + */ +int cgroupstats_build(struct cgroupstats *stats, struct dentry *dentry) +{ + int ret = -EINVAL; + struct cgroup *cont; + struct cgroup_iter it; + struct task_struct *tsk; + /* + * Validate dentry by checking the superblock operations + */ + if (dentry->d_sb->s_op != &cgroup_ops) + goto err; + + ret = 0; + cont = dentry->d_fsdata; + rcu_read_lock(); + + cgroup_iter_start(cont, &it); + while ((tsk = cgroup_iter_next(cont, &it))) { + switch (tsk->state) { + case TASK_RUNNING: + stats->nr_running++; + break; + case TASK_INTERRUPTIBLE: + stats->nr_sleeping++; + break; + case TASK_UNINTERRUPTIBLE: + stats->nr_uninterruptible++; + break; + case TASK_STOPPED: + stats->nr_stopped++; + break; + default: + if (delayacct_is_task_waiting_on_io(tsk)) + stats->nr_io_wait++; + break; + } + } + cgroup_iter_end(cont, &it); + + rcu_read_unlock(); +err: + return ret; +} + static int cmppid(const void *a, const void *b) { return *(pid_t *)a - *(pid_t *)b; |