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cgroup: separate out include/linux/cgroup-defs.h
From 2d728f74bfc071df06773e2fd7577dd5dab6425d Mon Sep 17 00:00:00 2001 From: Tejun Heo <tj@kernel.org> Date: Wed, 13 May 2015 15:37:01 -0400 This patch separates out cgroup-defs.h from cgroup.h which has grown a lot of dependencies. cgroup-defs.h currently only contains constant and type definitions and can be used to break circular include dependency. While moving, definitions are reordered so that cgroup-defs.h has consistent logical structure. This patch is pure reorganization. Signed-off-by: Tejun Heo <tj@kernel.org>
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Tejun Heo
parent
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464
include/linux/cgroup-defs.h
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464
include/linux/cgroup-defs.h
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@ -0,0 +1,464 @@
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/*
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* linux/cgroup-defs.h - basic definitions for cgroup
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*
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* This file provides basic type and interface. Include this file directly
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* only if necessary to avoid cyclic dependencies.
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*/
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#ifndef _LINUX_CGROUP_DEFS_H
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#define _LINUX_CGROUP_DEFS_H
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#include <linux/limits.h>
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#include <linux/list.h>
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#include <linux/idr.h>
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#include <linux/wait.h>
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#include <linux/mutex.h>
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#include <linux/rcupdate.h>
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#include <linux/percpu-refcount.h>
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#include <linux/workqueue.h>
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#ifdef CONFIG_CGROUPS
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struct cgroup;
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struct cgroup_root;
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struct cgroup_subsys;
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struct cgroup_taskset;
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struct kernfs_node;
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struct kernfs_ops;
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struct kernfs_open_file;
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#define MAX_CGROUP_TYPE_NAMELEN 32
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#define MAX_CGROUP_ROOT_NAMELEN 64
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#define MAX_CFTYPE_NAME 64
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/* define the enumeration of all cgroup subsystems */
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#define SUBSYS(_x) _x ## _cgrp_id,
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enum cgroup_subsys_id {
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#include <linux/cgroup_subsys.h>
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CGROUP_SUBSYS_COUNT,
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};
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#undef SUBSYS
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/* bits in struct cgroup_subsys_state flags field */
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enum {
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CSS_NO_REF = (1 << 0), /* no reference counting for this css */
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CSS_ONLINE = (1 << 1), /* between ->css_online() and ->css_offline() */
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CSS_RELEASED = (1 << 2), /* refcnt reached zero, released */
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};
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/* bits in struct cgroup flags field */
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enum {
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/* Control Group requires release notifications to userspace */
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CGRP_NOTIFY_ON_RELEASE,
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/*
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* Clone the parent's configuration when creating a new child
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* cpuset cgroup. For historical reasons, this option can be
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* specified at mount time and thus is implemented here.
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*/
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CGRP_CPUSET_CLONE_CHILDREN,
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};
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/* cgroup_root->flags */
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enum {
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CGRP_ROOT_SANE_BEHAVIOR = (1 << 0), /* __DEVEL__sane_behavior specified */
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CGRP_ROOT_NOPREFIX = (1 << 1), /* mounted subsystems have no named prefix */
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CGRP_ROOT_XATTR = (1 << 2), /* supports extended attributes */
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};
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/* cftype->flags */
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enum {
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CFTYPE_ONLY_ON_ROOT = (1 << 0), /* only create on root cgrp */
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CFTYPE_NOT_ON_ROOT = (1 << 1), /* don't create on root cgrp */
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CFTYPE_NO_PREFIX = (1 << 3), /* (DON'T USE FOR NEW FILES) no subsys prefix */
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/* internal flags, do not use outside cgroup core proper */
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__CFTYPE_ONLY_ON_DFL = (1 << 16), /* only on default hierarchy */
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__CFTYPE_NOT_ON_DFL = (1 << 17), /* not on default hierarchy */
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};
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/*
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* Per-subsystem/per-cgroup state maintained by the system. This is the
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* fundamental structural building block that controllers deal with.
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*
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* Fields marked with "PI:" are public and immutable and may be accessed
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* directly without synchronization.
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*/
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struct cgroup_subsys_state {
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/* PI: the cgroup that this css is attached to */
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struct cgroup *cgroup;
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/* PI: the cgroup subsystem that this css is attached to */
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struct cgroup_subsys *ss;
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/* reference count - access via css_[try]get() and css_put() */
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struct percpu_ref refcnt;
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/* PI: the parent css */
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struct cgroup_subsys_state *parent;
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/* siblings list anchored at the parent's ->children */
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struct list_head sibling;
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struct list_head children;
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/*
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* PI: Subsys-unique ID. 0 is unused and root is always 1. The
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* matching css can be looked up using css_from_id().
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*/
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int id;
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unsigned int flags;
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/*
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* Monotonically increasing unique serial number which defines a
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* uniform order among all csses. It's guaranteed that all
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* ->children lists are in the ascending order of ->serial_nr and
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* used to allow interrupting and resuming iterations.
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*/
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u64 serial_nr;
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/* percpu_ref killing and RCU release */
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struct rcu_head rcu_head;
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struct work_struct destroy_work;
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};
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/*
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* A css_set is a structure holding pointers to a set of
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* cgroup_subsys_state objects. This saves space in the task struct
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* object and speeds up fork()/exit(), since a single inc/dec and a
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* list_add()/del() can bump the reference count on the entire cgroup
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* set for a task.
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*/
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struct css_set {
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/* Reference count */
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atomic_t refcount;
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/*
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* List running through all cgroup groups in the same hash
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* slot. Protected by css_set_lock
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*/
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struct hlist_node hlist;
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/*
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* Lists running through all tasks using this cgroup group.
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* mg_tasks lists tasks which belong to this cset but are in the
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* process of being migrated out or in. Protected by
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* css_set_rwsem, but, during migration, once tasks are moved to
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* mg_tasks, it can be read safely while holding cgroup_mutex.
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*/
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struct list_head tasks;
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struct list_head mg_tasks;
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/*
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* List of cgrp_cset_links pointing at cgroups referenced from this
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* css_set. Protected by css_set_lock.
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*/
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struct list_head cgrp_links;
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/* the default cgroup associated with this css_set */
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struct cgroup *dfl_cgrp;
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/*
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* Set of subsystem states, one for each subsystem. This array is
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* immutable after creation apart from the init_css_set during
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* subsystem registration (at boot time).
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*/
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struct cgroup_subsys_state *subsys[CGROUP_SUBSYS_COUNT];
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/*
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* List of csets participating in the on-going migration either as
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* source or destination. Protected by cgroup_mutex.
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*/
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struct list_head mg_preload_node;
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struct list_head mg_node;
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/*
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* If this cset is acting as the source of migration the following
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* two fields are set. mg_src_cgrp is the source cgroup of the
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* on-going migration and mg_dst_cset is the destination cset the
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* target tasks on this cset should be migrated to. Protected by
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* cgroup_mutex.
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*/
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struct cgroup *mg_src_cgrp;
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struct css_set *mg_dst_cset;
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/*
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* On the default hierarhcy, ->subsys[ssid] may point to a css
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* attached to an ancestor instead of the cgroup this css_set is
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* associated with. The following node is anchored at
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* ->subsys[ssid]->cgroup->e_csets[ssid] and provides a way to
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* iterate through all css's attached to a given cgroup.
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*/
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struct list_head e_cset_node[CGROUP_SUBSYS_COUNT];
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/* For RCU-protected deletion */
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struct rcu_head rcu_head;
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};
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struct cgroup {
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/* self css with NULL ->ss, points back to this cgroup */
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struct cgroup_subsys_state self;
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unsigned long flags; /* "unsigned long" so bitops work */
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/*
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* idr allocated in-hierarchy ID.
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*
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* ID 0 is not used, the ID of the root cgroup is always 1, and a
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* new cgroup will be assigned with a smallest available ID.
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*
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* Allocating/Removing ID must be protected by cgroup_mutex.
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*/
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int id;
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/*
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* If this cgroup contains any tasks, it contributes one to
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* populated_cnt. All children with non-zero popuplated_cnt of
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* their own contribute one. The count is zero iff there's no task
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* in this cgroup or its subtree.
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*/
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int populated_cnt;
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struct kernfs_node *kn; /* cgroup kernfs entry */
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struct kernfs_node *populated_kn; /* kn for "cgroup.subtree_populated" */
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/*
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* The bitmask of subsystems enabled on the child cgroups.
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* ->subtree_control is the one configured through
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* "cgroup.subtree_control" while ->child_subsys_mask is the
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* effective one which may have more subsystems enabled.
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* Controller knobs are made available iff it's enabled in
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* ->subtree_control.
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*/
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unsigned int subtree_control;
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unsigned int child_subsys_mask;
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/* Private pointers for each registered subsystem */
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struct cgroup_subsys_state __rcu *subsys[CGROUP_SUBSYS_COUNT];
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struct cgroup_root *root;
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/*
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* List of cgrp_cset_links pointing at css_sets with tasks in this
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* cgroup. Protected by css_set_lock.
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*/
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struct list_head cset_links;
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/*
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* On the default hierarchy, a css_set for a cgroup with some
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* susbsys disabled will point to css's which are associated with
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* the closest ancestor which has the subsys enabled. The
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* following lists all css_sets which point to this cgroup's css
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* for the given subsystem.
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*/
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struct list_head e_csets[CGROUP_SUBSYS_COUNT];
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/*
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* list of pidlists, up to two for each namespace (one for procs, one
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* for tasks); created on demand.
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*/
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struct list_head pidlists;
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struct mutex pidlist_mutex;
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/* used to wait for offlining of csses */
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wait_queue_head_t offline_waitq;
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/* used to schedule release agent */
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struct work_struct release_agent_work;
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};
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/*
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* A cgroup_root represents the root of a cgroup hierarchy, and may be
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* associated with a kernfs_root to form an active hierarchy. This is
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* internal to cgroup core. Don't access directly from controllers.
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*/
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struct cgroup_root {
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struct kernfs_root *kf_root;
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/* The bitmask of subsystems attached to this hierarchy */
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unsigned int subsys_mask;
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/* Unique id for this hierarchy. */
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int hierarchy_id;
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/* The root cgroup. Root is destroyed on its release. */
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struct cgroup cgrp;
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/* Number of cgroups in the hierarchy, used only for /proc/cgroups */
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atomic_t nr_cgrps;
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/* A list running through the active hierarchies */
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struct list_head root_list;
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/* Hierarchy-specific flags */
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unsigned int flags;
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/* IDs for cgroups in this hierarchy */
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struct idr cgroup_idr;
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/* The path to use for release notifications. */
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char release_agent_path[PATH_MAX];
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/* The name for this hierarchy - may be empty */
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char name[MAX_CGROUP_ROOT_NAMELEN];
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};
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/*
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* struct cftype: handler definitions for cgroup control files
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*
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* When reading/writing to a file:
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* - the cgroup to use is file->f_path.dentry->d_parent->d_fsdata
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* - the 'cftype' of the file is file->f_path.dentry->d_fsdata
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*/
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struct cftype {
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/*
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* By convention, the name should begin with the name of the
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* subsystem, followed by a period. Zero length string indicates
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* end of cftype array.
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*/
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char name[MAX_CFTYPE_NAME];
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int private;
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/*
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* If not 0, file mode is set to this value, otherwise it will
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* be figured out automatically
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*/
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umode_t mode;
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/*
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* The maximum length of string, excluding trailing nul, that can
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* be passed to write. If < PAGE_SIZE-1, PAGE_SIZE-1 is assumed.
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*/
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size_t max_write_len;
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/* CFTYPE_* flags */
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unsigned int flags;
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/*
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* Fields used for internal bookkeeping. Initialized automatically
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* during registration.
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*/
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struct cgroup_subsys *ss; /* NULL for cgroup core files */
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struct list_head node; /* anchored at ss->cfts */
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struct kernfs_ops *kf_ops;
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/*
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* read_u64() is a shortcut for the common case of returning a
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* single integer. Use it in place of read()
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*/
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u64 (*read_u64)(struct cgroup_subsys_state *css, struct cftype *cft);
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/*
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* read_s64() is a signed version of read_u64()
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*/
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s64 (*read_s64)(struct cgroup_subsys_state *css, struct cftype *cft);
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/* generic seq_file read interface */
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int (*seq_show)(struct seq_file *sf, void *v);
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/* optional ops, implement all or none */
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void *(*seq_start)(struct seq_file *sf, loff_t *ppos);
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void *(*seq_next)(struct seq_file *sf, void *v, loff_t *ppos);
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void (*seq_stop)(struct seq_file *sf, void *v);
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/*
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* write_u64() is a shortcut for the common case of accepting
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* a single integer (as parsed by simple_strtoull) from
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* userspace. Use in place of write(); return 0 or error.
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*/
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int (*write_u64)(struct cgroup_subsys_state *css, struct cftype *cft,
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u64 val);
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/*
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* write_s64() is a signed version of write_u64()
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*/
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int (*write_s64)(struct cgroup_subsys_state *css, struct cftype *cft,
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s64 val);
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/*
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* write() is the generic write callback which maps directly to
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* kernfs write operation and overrides all other operations.
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* Maximum write size is determined by ->max_write_len. Use
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* of_css/cft() to access the associated css and cft.
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*/
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ssize_t (*write)(struct kernfs_open_file *of,
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char *buf, size_t nbytes, loff_t off);
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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struct lock_class_key lockdep_key;
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#endif
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};
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/*
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* Control Group subsystem type.
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* See Documentation/cgroups/cgroups.txt for details
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*/
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struct cgroup_subsys {
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struct cgroup_subsys_state *(*css_alloc)(struct cgroup_subsys_state *parent_css);
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int (*css_online)(struct cgroup_subsys_state *css);
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void (*css_offline)(struct cgroup_subsys_state *css);
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void (*css_released)(struct cgroup_subsys_state *css);
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void (*css_free)(struct cgroup_subsys_state *css);
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void (*css_reset)(struct cgroup_subsys_state *css);
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void (*css_e_css_changed)(struct cgroup_subsys_state *css);
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int (*can_attach)(struct cgroup_subsys_state *css,
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struct cgroup_taskset *tset);
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void (*cancel_attach)(struct cgroup_subsys_state *css,
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struct cgroup_taskset *tset);
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void (*attach)(struct cgroup_subsys_state *css,
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struct cgroup_taskset *tset);
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void (*fork)(struct task_struct *task);
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void (*exit)(struct cgroup_subsys_state *css,
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struct cgroup_subsys_state *old_css,
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struct task_struct *task);
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void (*bind)(struct cgroup_subsys_state *root_css);
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int disabled;
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int early_init;
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/*
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* If %false, this subsystem is properly hierarchical -
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* configuration, resource accounting and restriction on a parent
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* cgroup cover those of its children. If %true, hierarchy support
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* is broken in some ways - some subsystems ignore hierarchy
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* completely while others are only implemented half-way.
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*
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* It's now disallowed to create nested cgroups if the subsystem is
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* broken and cgroup core will emit a warning message on such
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* cases. Eventually, all subsystems will be made properly
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* hierarchical and this will go away.
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*/
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bool broken_hierarchy;
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bool warned_broken_hierarchy;
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/* the following two fields are initialized automtically during boot */
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int id;
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const char *name;
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/* link to parent, protected by cgroup_lock() */
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struct cgroup_root *root;
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/* idr for css->id */
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struct idr css_idr;
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/*
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* List of cftypes. Each entry is the first entry of an array
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* terminated by zero length name.
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*/
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struct list_head cfts;
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/*
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* Base cftypes which are automatically registered. The two can
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* point to the same array.
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*/
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struct cftype *dfl_cftypes; /* for the default hierarchy */
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struct cftype *legacy_cftypes; /* for the legacy hierarchies */
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/*
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* A subsystem may depend on other subsystems. When such subsystem
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* is enabled on a cgroup, the depended-upon subsystems are enabled
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* together if available. Subsystems enabled due to dependency are
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* not visible to userland until explicitly enabled. The following
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* specifies the mask of subsystems that this one depends on.
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*/
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unsigned int depends_on;
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};
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#endif /* CONFIG_CGROUPS */
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#endif /* _LINUX_CGROUP_DEFS_H */
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@ -11,24 +11,17 @@
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#include <linux/sched.h>
|
||||
#include <linux/cpumask.h>
|
||||
#include <linux/nodemask.h>
|
||||
#include <linux/rcupdate.h>
|
||||
#include <linux/rculist.h>
|
||||
#include <linux/cgroupstats.h>
|
||||
#include <linux/rwsem.h>
|
||||
#include <linux/idr.h>
|
||||
#include <linux/workqueue.h>
|
||||
#include <linux/fs.h>
|
||||
#include <linux/percpu-refcount.h>
|
||||
#include <linux/seq_file.h>
|
||||
#include <linux/kernfs.h>
|
||||
#include <linux/wait.h>
|
||||
|
||||
#include <linux/cgroup-defs.h>
|
||||
|
||||
#ifdef CONFIG_CGROUPS
|
||||
|
||||
struct cgroup_root;
|
||||
struct cgroup_subsys;
|
||||
struct cgroup;
|
||||
|
||||
extern int cgroup_init_early(void);
|
||||
extern int cgroup_init(void);
|
||||
extern void cgroup_fork(struct task_struct *p);
|
||||
@ -40,66 +33,6 @@ extern int cgroupstats_build(struct cgroupstats *stats,
|
||||
extern int proc_cgroup_show(struct seq_file *m, struct pid_namespace *ns,
|
||||
struct pid *pid, struct task_struct *tsk);
|
||||
|
||||
/* define the enumeration of all cgroup subsystems */
|
||||
#define SUBSYS(_x) _x ## _cgrp_id,
|
||||
enum cgroup_subsys_id {
|
||||
#include <linux/cgroup_subsys.h>
|
||||
CGROUP_SUBSYS_COUNT,
|
||||
};
|
||||
#undef SUBSYS
|
||||
|
||||
/*
|
||||
* Per-subsystem/per-cgroup state maintained by the system. This is the
|
||||
* fundamental structural building block that controllers deal with.
|
||||
*
|
||||
* Fields marked with "PI:" are public and immutable and may be accessed
|
||||
* directly without synchronization.
|
||||
*/
|
||||
struct cgroup_subsys_state {
|
||||
/* PI: the cgroup that this css is attached to */
|
||||
struct cgroup *cgroup;
|
||||
|
||||
/* PI: the cgroup subsystem that this css is attached to */
|
||||
struct cgroup_subsys *ss;
|
||||
|
||||
/* reference count - access via css_[try]get() and css_put() */
|
||||
struct percpu_ref refcnt;
|
||||
|
||||
/* PI: the parent css */
|
||||
struct cgroup_subsys_state *parent;
|
||||
|
||||
/* siblings list anchored at the parent's ->children */
|
||||
struct list_head sibling;
|
||||
struct list_head children;
|
||||
|
||||
/*
|
||||
* PI: Subsys-unique ID. 0 is unused and root is always 1. The
|
||||
* matching css can be looked up using css_from_id().
|
||||
*/
|
||||
int id;
|
||||
|
||||
unsigned int flags;
|
||||
|
||||
/*
|
||||
* Monotonically increasing unique serial number which defines a
|
||||
* uniform order among all csses. It's guaranteed that all
|
||||
* ->children lists are in the ascending order of ->serial_nr and
|
||||
* used to allow interrupting and resuming iterations.
|
||||
*/
|
||||
u64 serial_nr;
|
||||
|
||||
/* percpu_ref killing and RCU release */
|
||||
struct rcu_head rcu_head;
|
||||
struct work_struct destroy_work;
|
||||
};
|
||||
|
||||
/* bits in struct cgroup_subsys_state flags field */
|
||||
enum {
|
||||
CSS_NO_REF = (1 << 0), /* no reference counting for this css */
|
||||
CSS_ONLINE = (1 << 1), /* between ->css_online() and ->css_offline() */
|
||||
CSS_RELEASED = (1 << 2), /* refcnt reached zero, released */
|
||||
};
|
||||
|
||||
/**
|
||||
* css_get - obtain a reference on the specified css
|
||||
* @css: target css
|
||||
@ -185,307 +118,6 @@ static inline void css_put_many(struct cgroup_subsys_state *css, unsigned int n)
|
||||
percpu_ref_put_many(&css->refcnt, n);
|
||||
}
|
||||
|
||||
/* bits in struct cgroup flags field */
|
||||
enum {
|
||||
/* Control Group requires release notifications to userspace */
|
||||
CGRP_NOTIFY_ON_RELEASE,
|
||||
/*
|
||||
* Clone the parent's configuration when creating a new child
|
||||
* cpuset cgroup. For historical reasons, this option can be
|
||||
* specified at mount time and thus is implemented here.
|
||||
*/
|
||||
CGRP_CPUSET_CLONE_CHILDREN,
|
||||
};
|
||||
|
||||
struct cgroup {
|
||||
/* self css with NULL ->ss, points back to this cgroup */
|
||||
struct cgroup_subsys_state self;
|
||||
|
||||
unsigned long flags; /* "unsigned long" so bitops work */
|
||||
|
||||
/*
|
||||
* idr allocated in-hierarchy ID.
|
||||
*
|
||||
* ID 0 is not used, the ID of the root cgroup is always 1, and a
|
||||
* new cgroup will be assigned with a smallest available ID.
|
||||
*
|
||||
* Allocating/Removing ID must be protected by cgroup_mutex.
|
||||
*/
|
||||
int id;
|
||||
|
||||
/*
|
||||
* If this cgroup contains any tasks, it contributes one to
|
||||
* populated_cnt. All children with non-zero popuplated_cnt of
|
||||
* their own contribute one. The count is zero iff there's no task
|
||||
* in this cgroup or its subtree.
|
||||
*/
|
||||
int populated_cnt;
|
||||
|
||||
struct kernfs_node *kn; /* cgroup kernfs entry */
|
||||
struct kernfs_node *populated_kn; /* kn for "cgroup.subtree_populated" */
|
||||
|
||||
/*
|
||||
* The bitmask of subsystems enabled on the child cgroups.
|
||||
* ->subtree_control is the one configured through
|
||||
* "cgroup.subtree_control" while ->child_subsys_mask is the
|
||||
* effective one which may have more subsystems enabled.
|
||||
* Controller knobs are made available iff it's enabled in
|
||||
* ->subtree_control.
|
||||
*/
|
||||
unsigned int subtree_control;
|
||||
unsigned int child_subsys_mask;
|
||||
|
||||
/* Private pointers for each registered subsystem */
|
||||
struct cgroup_subsys_state __rcu *subsys[CGROUP_SUBSYS_COUNT];
|
||||
|
||||
struct cgroup_root *root;
|
||||
|
||||
/*
|
||||
* List of cgrp_cset_links pointing at css_sets with tasks in this
|
||||
* cgroup. Protected by css_set_lock.
|
||||
*/
|
||||
struct list_head cset_links;
|
||||
|
||||
/*
|
||||
* On the default hierarchy, a css_set for a cgroup with some
|
||||
* susbsys disabled will point to css's which are associated with
|
||||
* the closest ancestor which has the subsys enabled. The
|
||||
* following lists all css_sets which point to this cgroup's css
|
||||
* for the given subsystem.
|
||||
*/
|
||||
struct list_head e_csets[CGROUP_SUBSYS_COUNT];
|
||||
|
||||
/*
|
||||
* list of pidlists, up to two for each namespace (one for procs, one
|
||||
* for tasks); created on demand.
|
||||
*/
|
||||
struct list_head pidlists;
|
||||
struct mutex pidlist_mutex;
|
||||
|
||||
/* used to wait for offlining of csses */
|
||||
wait_queue_head_t offline_waitq;
|
||||
|
||||
/* used to schedule release agent */
|
||||
struct work_struct release_agent_work;
|
||||
};
|
||||
|
||||
#define MAX_CGROUP_ROOT_NAMELEN 64
|
||||
|
||||
/* cgroup_root->flags */
|
||||
enum {
|
||||
CGRP_ROOT_SANE_BEHAVIOR = (1 << 0), /* __DEVEL__sane_behavior specified */
|
||||
CGRP_ROOT_NOPREFIX = (1 << 1), /* mounted subsystems have no named prefix */
|
||||
CGRP_ROOT_XATTR = (1 << 2), /* supports extended attributes */
|
||||
};
|
||||
|
||||
/*
|
||||
* A cgroup_root represents the root of a cgroup hierarchy, and may be
|
||||
* associated with a kernfs_root to form an active hierarchy. This is
|
||||
* internal to cgroup core. Don't access directly from controllers.
|
||||
*/
|
||||
struct cgroup_root {
|
||||
struct kernfs_root *kf_root;
|
||||
|
||||
/* The bitmask of subsystems attached to this hierarchy */
|
||||
unsigned int subsys_mask;
|
||||
|
||||
/* Unique id for this hierarchy. */
|
||||
int hierarchy_id;
|
||||
|
||||
/* The root cgroup. Root is destroyed on its release. */
|
||||
struct cgroup cgrp;
|
||||
|
||||
/* Number of cgroups in the hierarchy, used only for /proc/cgroups */
|
||||
atomic_t nr_cgrps;
|
||||
|
||||
/* A list running through the active hierarchies */
|
||||
struct list_head root_list;
|
||||
|
||||
/* Hierarchy-specific flags */
|
||||
unsigned int flags;
|
||||
|
||||
/* IDs for cgroups in this hierarchy */
|
||||
struct idr cgroup_idr;
|
||||
|
||||
/* The path to use for release notifications. */
|
||||
char release_agent_path[PATH_MAX];
|
||||
|
||||
/* The name for this hierarchy - may be empty */
|
||||
char name[MAX_CGROUP_ROOT_NAMELEN];
|
||||
};
|
||||
|
||||
/*
|
||||
* A css_set is a structure holding pointers to a set of
|
||||
* cgroup_subsys_state objects. This saves space in the task struct
|
||||
* object and speeds up fork()/exit(), since a single inc/dec and a
|
||||
* list_add()/del() can bump the reference count on the entire cgroup
|
||||
* set for a task.
|
||||
*/
|
||||
|
||||
struct css_set {
|
||||
|
||||
/* Reference count */
|
||||
atomic_t refcount;
|
||||
|
||||
/*
|
||||
* List running through all cgroup groups in the same hash
|
||||
* slot. Protected by css_set_lock
|
||||
*/
|
||||
struct hlist_node hlist;
|
||||
|
||||
/*
|
||||
* Lists running through all tasks using this cgroup group.
|
||||
* mg_tasks lists tasks which belong to this cset but are in the
|
||||
* process of being migrated out or in. Protected by
|
||||
* css_set_rwsem, but, during migration, once tasks are moved to
|
||||
* mg_tasks, it can be read safely while holding cgroup_mutex.
|
||||
*/
|
||||
struct list_head tasks;
|
||||
struct list_head mg_tasks;
|
||||
|
||||
/*
|
||||
* List of cgrp_cset_links pointing at cgroups referenced from this
|
||||
* css_set. Protected by css_set_lock.
|
||||
*/
|
||||
struct list_head cgrp_links;
|
||||
|
||||
/* the default cgroup associated with this css_set */
|
||||
struct cgroup *dfl_cgrp;
|
||||
|
||||
/*
|
||||
* Set of subsystem states, one for each subsystem. This array is
|
||||
* immutable after creation apart from the init_css_set during
|
||||
* subsystem registration (at boot time).
|
||||
*/
|
||||
struct cgroup_subsys_state *subsys[CGROUP_SUBSYS_COUNT];
|
||||
|
||||
/*
|
||||
* List of csets participating in the on-going migration either as
|
||||
* source or destination. Protected by cgroup_mutex.
|
||||
*/
|
||||
struct list_head mg_preload_node;
|
||||
struct list_head mg_node;
|
||||
|
||||
/*
|
||||
* If this cset is acting as the source of migration the following
|
||||
* two fields are set. mg_src_cgrp is the source cgroup of the
|
||||
* on-going migration and mg_dst_cset is the destination cset the
|
||||
* target tasks on this cset should be migrated to. Protected by
|
||||
* cgroup_mutex.
|
||||
*/
|
||||
struct cgroup *mg_src_cgrp;
|
||||
struct css_set *mg_dst_cset;
|
||||
|
||||
/*
|
||||
* On the default hierarhcy, ->subsys[ssid] may point to a css
|
||||
* attached to an ancestor instead of the cgroup this css_set is
|
||||
* associated with. The following node is anchored at
|
||||
* ->subsys[ssid]->cgroup->e_csets[ssid] and provides a way to
|
||||
* iterate through all css's attached to a given cgroup.
|
||||
*/
|
||||
struct list_head e_cset_node[CGROUP_SUBSYS_COUNT];
|
||||
|
||||
/* For RCU-protected deletion */
|
||||
struct rcu_head rcu_head;
|
||||
};
|
||||
|
||||
/*
|
||||
* struct cftype: handler definitions for cgroup control files
|
||||
*
|
||||
* When reading/writing to a file:
|
||||
* - the cgroup to use is file->f_path.dentry->d_parent->d_fsdata
|
||||
* - the 'cftype' of the file is file->f_path.dentry->d_fsdata
|
||||
*/
|
||||
|
||||
/* cftype->flags */
|
||||
enum {
|
||||
CFTYPE_ONLY_ON_ROOT = (1 << 0), /* only create on root cgrp */
|
||||
CFTYPE_NOT_ON_ROOT = (1 << 1), /* don't create on root cgrp */
|
||||
CFTYPE_NO_PREFIX = (1 << 3), /* (DON'T USE FOR NEW FILES) no subsys prefix */
|
||||
|
||||
/* internal flags, do not use outside cgroup core proper */
|
||||
__CFTYPE_ONLY_ON_DFL = (1 << 16), /* only on default hierarchy */
|
||||
__CFTYPE_NOT_ON_DFL = (1 << 17), /* not on default hierarchy */
|
||||
};
|
||||
|
||||
#define MAX_CFTYPE_NAME 64
|
||||
|
||||
struct cftype {
|
||||
/*
|
||||
* By convention, the name should begin with the name of the
|
||||
* subsystem, followed by a period. Zero length string indicates
|
||||
* end of cftype array.
|
||||
*/
|
||||
char name[MAX_CFTYPE_NAME];
|
||||
int private;
|
||||
/*
|
||||
* If not 0, file mode is set to this value, otherwise it will
|
||||
* be figured out automatically
|
||||
*/
|
||||
umode_t mode;
|
||||
|
||||
/*
|
||||
* The maximum length of string, excluding trailing nul, that can
|
||||
* be passed to write. If < PAGE_SIZE-1, PAGE_SIZE-1 is assumed.
|
||||
*/
|
||||
size_t max_write_len;
|
||||
|
||||
/* CFTYPE_* flags */
|
||||
unsigned int flags;
|
||||
|
||||
/*
|
||||
* Fields used for internal bookkeeping. Initialized automatically
|
||||
* during registration.
|
||||
*/
|
||||
struct cgroup_subsys *ss; /* NULL for cgroup core files */
|
||||
struct list_head node; /* anchored at ss->cfts */
|
||||
struct kernfs_ops *kf_ops;
|
||||
|
||||
/*
|
||||
* read_u64() is a shortcut for the common case of returning a
|
||||
* single integer. Use it in place of read()
|
||||
*/
|
||||
u64 (*read_u64)(struct cgroup_subsys_state *css, struct cftype *cft);
|
||||
/*
|
||||
* read_s64() is a signed version of read_u64()
|
||||
*/
|
||||
s64 (*read_s64)(struct cgroup_subsys_state *css, struct cftype *cft);
|
||||
|
||||
/* generic seq_file read interface */
|
||||
int (*seq_show)(struct seq_file *sf, void *v);
|
||||
|
||||
/* optional ops, implement all or none */
|
||||
void *(*seq_start)(struct seq_file *sf, loff_t *ppos);
|
||||
void *(*seq_next)(struct seq_file *sf, void *v, loff_t *ppos);
|
||||
void (*seq_stop)(struct seq_file *sf, void *v);
|
||||
|
||||
/*
|
||||
* write_u64() is a shortcut for the common case of accepting
|
||||
* a single integer (as parsed by simple_strtoull) from
|
||||
* userspace. Use in place of write(); return 0 or error.
|
||||
*/
|
||||
int (*write_u64)(struct cgroup_subsys_state *css, struct cftype *cft,
|
||||
u64 val);
|
||||
/*
|
||||
* write_s64() is a signed version of write_u64()
|
||||
*/
|
||||
int (*write_s64)(struct cgroup_subsys_state *css, struct cftype *cft,
|
||||
s64 val);
|
||||
|
||||
/*
|
||||
* write() is the generic write callback which maps directly to
|
||||
* kernfs write operation and overrides all other operations.
|
||||
* Maximum write size is determined by ->max_write_len. Use
|
||||
* of_css/cft() to access the associated css and cft.
|
||||
*/
|
||||
ssize_t (*write)(struct kernfs_open_file *of,
|
||||
char *buf, size_t nbytes, loff_t off);
|
||||
|
||||
#ifdef CONFIG_DEBUG_LOCK_ALLOC
|
||||
struct lock_class_key lockdep_key;
|
||||
#endif
|
||||
};
|
||||
|
||||
extern struct cgroup_root cgrp_dfl_root;
|
||||
extern struct css_set init_css_set;
|
||||
|
||||
@ -612,11 +244,6 @@ int cgroup_rm_cftypes(struct cftype *cfts);
|
||||
|
||||
bool cgroup_is_descendant(struct cgroup *cgrp, struct cgroup *ancestor);
|
||||
|
||||
/*
|
||||
* Control Group taskset, used to pass around set of tasks to cgroup_subsys
|
||||
* methods.
|
||||
*/
|
||||
struct cgroup_taskset;
|
||||
struct task_struct *cgroup_taskset_first(struct cgroup_taskset *tset);
|
||||
struct task_struct *cgroup_taskset_next(struct cgroup_taskset *tset);
|
||||
|
||||
@ -629,84 +256,6 @@ struct task_struct *cgroup_taskset_next(struct cgroup_taskset *tset);
|
||||
for ((task) = cgroup_taskset_first((tset)); (task); \
|
||||
(task) = cgroup_taskset_next((tset)))
|
||||
|
||||
/*
|
||||
* Control Group subsystem type.
|
||||
* See Documentation/cgroups/cgroups.txt for details
|
||||
*/
|
||||
|
||||
struct cgroup_subsys {
|
||||
struct cgroup_subsys_state *(*css_alloc)(struct cgroup_subsys_state *parent_css);
|
||||
int (*css_online)(struct cgroup_subsys_state *css);
|
||||
void (*css_offline)(struct cgroup_subsys_state *css);
|
||||
void (*css_released)(struct cgroup_subsys_state *css);
|
||||
void (*css_free)(struct cgroup_subsys_state *css);
|
||||
void (*css_reset)(struct cgroup_subsys_state *css);
|
||||
void (*css_e_css_changed)(struct cgroup_subsys_state *css);
|
||||
|
||||
int (*can_attach)(struct cgroup_subsys_state *css,
|
||||
struct cgroup_taskset *tset);
|
||||
void (*cancel_attach)(struct cgroup_subsys_state *css,
|
||||
struct cgroup_taskset *tset);
|
||||
void (*attach)(struct cgroup_subsys_state *css,
|
||||
struct cgroup_taskset *tset);
|
||||
void (*fork)(struct task_struct *task);
|
||||
void (*exit)(struct cgroup_subsys_state *css,
|
||||
struct cgroup_subsys_state *old_css,
|
||||
struct task_struct *task);
|
||||
void (*bind)(struct cgroup_subsys_state *root_css);
|
||||
|
||||
int disabled;
|
||||
int early_init;
|
||||
|
||||
/*
|
||||
* If %false, this subsystem is properly hierarchical -
|
||||
* configuration, resource accounting and restriction on a parent
|
||||
* cgroup cover those of its children. If %true, hierarchy support
|
||||
* is broken in some ways - some subsystems ignore hierarchy
|
||||
* completely while others are only implemented half-way.
|
||||
*
|
||||
* It's now disallowed to create nested cgroups if the subsystem is
|
||||
* broken and cgroup core will emit a warning message on such
|
||||
* cases. Eventually, all subsystems will be made properly
|
||||
* hierarchical and this will go away.
|
||||
*/
|
||||
bool broken_hierarchy;
|
||||
bool warned_broken_hierarchy;
|
||||
|
||||
/* the following two fields are initialized automtically during boot */
|
||||
int id;
|
||||
#define MAX_CGROUP_TYPE_NAMELEN 32
|
||||
const char *name;
|
||||
|
||||
/* link to parent, protected by cgroup_lock() */
|
||||
struct cgroup_root *root;
|
||||
|
||||
/* idr for css->id */
|
||||
struct idr css_idr;
|
||||
|
||||
/*
|
||||
* List of cftypes. Each entry is the first entry of an array
|
||||
* terminated by zero length name.
|
||||
*/
|
||||
struct list_head cfts;
|
||||
|
||||
/*
|
||||
* Base cftypes which are automatically registered. The two can
|
||||
* point to the same array.
|
||||
*/
|
||||
struct cftype *dfl_cftypes; /* for the default hierarchy */
|
||||
struct cftype *legacy_cftypes; /* for the legacy hierarchies */
|
||||
|
||||
/*
|
||||
* A subsystem may depend on other subsystems. When such subsystem
|
||||
* is enabled on a cgroup, the depended-upon subsystems are enabled
|
||||
* together if available. Subsystems enabled due to dependency are
|
||||
* not visible to userland until explicitly enabled. The following
|
||||
* specifies the mask of subsystems that this one depends on.
|
||||
*/
|
||||
unsigned int depends_on;
|
||||
};
|
||||
|
||||
#define SUBSYS(_x) extern struct cgroup_subsys _x ## _cgrp_subsys;
|
||||
#include <linux/cgroup_subsys.h>
|
||||
#undef SUBSYS
|
||||
|
||||
Loading…
Reference in New Issue
Block a user