diff options
Diffstat (limited to 'include/linux/cgroup.h')
| -rw-r--r-- | include/linux/cgroup.h | 42 |
1 files changed, 40 insertions, 2 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h index 473e0c0abb86..32c553556bbd 100644 --- a/include/linux/cgroup.h +++ b/include/linux/cgroup.h @@ -554,6 +554,36 @@ static inline bool cgroup_is_descendant(struct cgroup *cgrp, } /** + * cgroup_ancestor - find ancestor of cgroup + * @cgrp: cgroup to find ancestor of + * @ancestor_level: level of ancestor to find starting from root + * + * Find ancestor of cgroup at specified level starting from root if it exists + * and return pointer to it. Return NULL if @cgrp doesn't have ancestor at + * @ancestor_level. + * + * This function is safe to call as long as @cgrp is accessible. + */ +static inline struct cgroup *cgroup_ancestor(struct cgroup *cgrp, + int ancestor_level) +{ + struct cgroup *ptr; + + if (cgrp->level < ancestor_level) + return NULL; + + for (ptr = cgrp; + ptr && ptr->level > ancestor_level; + ptr = cgroup_parent(ptr)) + ; + + if (ptr && ptr->level == ancestor_level) + return ptr; + + return NULL; +} + +/** * task_under_cgroup_hierarchy - test task's membership of cgroup ancestry * @task: the task to be tested * @ancestor: possible ancestor of @task's cgroup @@ -690,11 +720,19 @@ static inline void cgroup_path_from_kernfs_id(const union kernfs_node_id *id, char *buf, size_t buflen) {} #endif /* !CONFIG_CGROUPS */ +#ifdef CONFIG_CGROUPS /* - * Basic resource stats. + * cgroup scalable recursive statistics. */ -#ifdef CONFIG_CGROUPS +void cgroup_rstat_updated(struct cgroup *cgrp, int cpu); +void cgroup_rstat_flush(struct cgroup *cgrp); +void cgroup_rstat_flush_irqsafe(struct cgroup *cgrp); +void cgroup_rstat_flush_hold(struct cgroup *cgrp); +void cgroup_rstat_flush_release(void); +/* + * Basic resource stats. + */ #ifdef CONFIG_CGROUP_CPUACCT void cpuacct_charge(struct task_struct *tsk, u64 cputime); void cpuacct_account_field(struct task_struct *tsk, int index, u64 val); |