Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\cgroup\cgroup.c Create Date:2022-07-28 11:08:19
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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Name:rebind_subsystems

Proto:int rebind_subsystems(struct cgroup_root *dst_root, u16 ss_mask)

Type:int

Parameter:

TypeParameterName
struct cgroup_root *dst_root
u16ss_mask
1718  dcgrp = The root cgroup. Root is destroyed on its release.
1722  lockdep_assert_held( & cgroup_mutex is the master lock)
1724  Do
1724  __ss_mask = ss_mask
1724  If Not CGROUP_SUBSYS_COUNT Then
1724  ssid = 0
1724  Break
1724  When ssid < CGROUP_SUBSYS_COUNT cycle
1724  ss = cgroup_subsys[ssid]
1737  When (false) cycle
1739  Do
1739  __ss_mask = ss_mask
1739  If Not CGROUP_SUBSYS_COUNT Then
1739  ssid = 0
1739  Break
1739  When ssid < CGROUP_SUBSYS_COUNT cycle
1739  ss = cgroup_subsys[ssid]
1740  src_root = link to parent, protected by cgroup_lock()
1741  scgrp = The root cgroup. Root is destroyed on its release.
1742  css = group_css - obtain a cgroup's css for the specified subsystem*@cgrp: the cgroup of interest*@ss: the subsystem of interest (%NULL returns @cgrp->self)* Return @cgrp's css (cgroup_subsys_state) associated with @ss
1745  WARN_ON(!css || group_css - obtain a cgroup's css for the specified subsystem*@cgrp: the cgroup of interest*@ss: the subsystem of interest (%NULL returns @cgrp->self)* Return @cgrp's css (cgroup_subsys_state) associated with @ss)
1748  The bitmask of subsystems attached to this hierarchy &= ~(1 << ssid)
1749  WARN_ON(cgroup_apply_control(scgrp))
1750  cgroup_finalize_control(scgrp, 0)
1753  RCU_INIT_POINTER() - initialize an RCU protected pointer*@p: The pointer to be initialized.*@v: The value to initialized the pointer to.* Initialize an RCU-protected pointer in special cases where readers( Private pointers for each registered subsystem [ssid], NULL)
1754  cu_assign_pointer() - assign to RCU-protected pointer*@p: pointer to assign to*@v: value to assign (publish)* Assigns the specified value to the specified RCU-protected* pointer, ensuring that any concurrent RCU readers will see* any prior initialization( Private pointers for each registered subsystem [ssid], css)
1755  link to parent, protected by cgroup_lock() = dst_root
1756  PI: the cgroup that this css is attached to = dcgrp
1758  spin_lock_irq( & css_set_lock)
1759  hash_for_each - iterate over a hashtable*@name: hashtable to iterate*@bkt: integer to use as bucket loop cursor*@obj: the type * to use as a loop cursor for each entry*@member: the name of the hlist_node within the struct(css_set_table, i, cset, hlist)
1760  list_move_tail - delete from one list and add as another's tail*@list: the entry to move*@head: the head that will follow our entry
1762  spin_unlock_irq( & css_set_lock)
1765  The bitmask of subsystems attached to this hierarchy |= 1 << ssid
1766  If dst_root == The default hierarchy, reserved for the subsystems that are otherwise* unattached - it never has more than a single cgroup, and all tasks are* part of that cgroup. Then
1768  Else
1773  ret = cgroup_apply_control(dcgrp)
1774  If ret Then pr_warn("partial failure to rebind %s controller (err=%d)\n", name, ret)
1778  If bind Then bind(css)
1780  When (false) cycle
1782  kernfs_activate( cgroup kernfs entry )
1783  Return 0
Caller
NameDescribe
cgroup_destroy_root
cgroup_setup_root
cgroup1_reconfigure