Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\cgroup\cgroup-v1.c Create Date:2022-07-28 11:13:06
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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Annotation kernel can get tool activityDownload SCCTChinese

Name:groupstats_build - build and fill cgroupstats*@stats: cgroupstats to fill information into*@dentry: A dentry entry belonging to the cgroup for which stats have* been requested.* Build and fill cgroupstats so that taskstats can export it to user* space.

Proto:int cgroupstats_build(struct cgroupstats *stats, struct dentry *dentry)

Type:int

Parameter:

TypeParameterName
struct cgroupstats *stats
struct dentry *dentry
692  kn = kernfs_node_from_dentry(dentry)
698  If s_type != cgroup_fs_type || Not kn || kernfs_type(kn) != KERNFS_DIR Then Return -EINVAL
702  mutex_lock( & cgroup_mutex is the master lock)
709  _read_lock() - mark the beginning of an RCU read-side critical section* When synchronize_rcu() is invoked on one CPU while other CPUs* are within RCU read-side critical sections, then the* synchronize_rcu() is guaranteed to block until after all the other
710  cgrp = fetch RCU-protected pointer for dereferencing( * (void__rcu__force * * ) & priv)
711  If Not cgrp || cgroup_is_dead(cgrp) Then
712  _read_unlock() - marks the end of an RCU read-side critical section.* In most situations, rcu_read_unlock() is immune from deadlock.* However, in kernels built with CONFIG_RCU_BOOST, rcu_read_unlock()
713  mutex_unlock - release the mutex*@lock: the mutex to be released* Unlock a mutex that has been locked by this task previously.* This function must not be used in interrupt context. Unlocking* of a not locked mutex is not allowed.
714  Return -ENOENT
716  _read_unlock() - marks the end of an RCU read-side critical section.* In most situations, rcu_read_unlock() is immune from deadlock.* However, in kernels built with CONFIG_RCU_BOOST, rcu_read_unlock()
718  ss_task_iter_start - initiate task iteration*@css: the css to walk tasks of*@flags: CSS_TASK_ITER_* flags*@it: the task iterator to use* Initiate iteration through the tasks of @css
719  When tsk = ss_task_iter_next - return the next task for the iterator*@it: the task iterator being iterated* The "next" function for task iteration. @it should have been* initialized via css_task_iter_start(). Returns NULL when the iteration* reaches the end. cycle
721  Case run state == Used in tsk->state:
722  Number of tasks running ++
723  Break
724  Case run state == TASK_INTERRUPTIBLE
725  Number of tasks sleeping ++
726  Break
727  Case run state == TASK_UNINTERRUPTIBLE
728  Number of tasks in uninterruptible ++
729  Break
730  Case run state == TASK_STOPPED
731  Number of tasks in stopped state ++
732  Break
733  Default
734  If delayacct_is_task_waiting_on_io(tsk) Then Number of tasks waiting on IO ++
736  Break
739  ss_task_iter_end - finish task iteration*@it: the task iterator to finish* Finish task iteration started by css_task_iter_start().
741  mutex_unlock - release the mutex*@lock: the mutex to be released* Unlock a mutex that has been locked by this task previously.* This function must not be used in interrupt context. Unlocking* of a not locked mutex is not allowed.
742  Return 0
Caller
NameDescribe
cgroupstats_user_cmd