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Merge branch 'for-3.5' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

Browse Source 
Pull cgroup updates from Tejun Heo:
 "cgroup file type addition / removal is updated so that file types are
  added and removed instead of individual files so that dynamic file
  type addition / removal can be implemented by cgroup and used by
  controllers.  blkio controller changes which will come through block
  tree are dependent on this.  Other changes include res_counter cleanup
  and disallowing kthread / PF_THREAD_BOUND threads to be attached to
  non-root cgroups.

  There's a reported bug with the file type addition / removal handling
  which can lead to oops on cgroup umount.  The issue is being looked
  into.  It shouldn't cause problems for most setups and isn't a
  security concern."

Fix up trivial conflict in Documentation/feature-removal-schedule.txt

* 'for-3.5' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup: (21 commits)
  res_counter: Account max_usage when calling res_counter_charge_nofail()
  res_counter: Merge res_counter_charge and res_counter_charge_nofail
  cgroups: disallow attaching kthreadd or PF_THREAD_BOUND threads
  cgroup: remove cgroup_subsys->populate()
  cgroup: get rid of populate for memcg
  cgroup: pass struct mem_cgroup instead of struct cgroup to socket memcg
  cgroup: make css->refcnt clearing on cgroup removal optional
  cgroup: use negative bias on css->refcnt to block css_tryget()
  cgroup: implement cgroup_rm_cftypes()
  cgroup: introduce struct cfent
  cgroup: relocate __d_cgrp() and __d_cft()
  cgroup: remove cgroup_add_file[s]()
  cgroup: convert memcg controller to the new cftype interface
  memcg: always create memsw files if CONFIG_CGROUP_MEM_RES_CTLR_SWAP
  cgroup: convert all non-memcg controllers to the new cftype interface
  cgroup: relocate cftype and cgroup_subsys definitions in controllers
  cgroup: merge cft_release_agent cftype array into the base files array
  cgroup: implement cgroup_add_cftypes() and friends
  cgroup: build list of all cgroups under a given cgroupfs_root
  cgroup: move cgroup_clear_directory() call out of cgroup_populate_dir()
  ...
This commit is contained in:
Linus Torvalds 2012-05-22 17:40:19 -07:00
commit 88d6ae8dc3
18 changed files with 688 additions and 439 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
Documentation/cgroups/resource_counter.txt
View File

@ -77,11 +77,11 @@ to work with it.
where the charging failed.
d. int res_counter_charge_locked
(struct res_counter *rc, unsigned long val)
(struct res_counter *rc, unsigned long val, bool force)
The same as res_counter_charge(), but it must not acquire/release the
res_counter->lock internally (it must be called with res_counter->lock
held).
held). The force parameter indicates whether we can bypass the limit.
e. void res_counter_uncharge[_locked]
(struct res_counter *rc, unsigned long val)

11
Documentation/feature-removal-schedule.txt
View File

@ -556,3 +556,14 @@ Why: The V4L2_CID_VCENTER, V4L2_CID_HCENTER controls have been deprecated
There are newer controls (V4L2_CID_PAN*, V4L2_CID_TILT*) that provide
similar functionality.
Who: Sylwester Nawrocki <sylvester.nawrocki@gmail.com>
----------------------------
What: cgroup option updates via remount
When: March 2013
Why: Remount currently allows changing bound subsystems and
release_agent. Rebinding is hardly useful as it only works
when the hierarchy is empty and release_agent itself should be
replaced with conventional fsnotify.
----------------------------

45
block/blk-cgroup.c
View File

@ -28,34 +28,12 @@ static LIST_HEAD(blkio_list);
struct blkio_cgroup blkio_root_cgroup = { .weight = 2*BLKIO_WEIGHT_DEFAULT };
EXPORT_SYMBOL_GPL(blkio_root_cgroup);
static struct cgroup_subsys_state *blkiocg_create(struct cgroup *);
static int blkiocg_can_attach(struct cgroup *, struct cgroup_taskset *);
static void blkiocg_attach(struct cgroup *, struct cgroup_taskset *);
static void blkiocg_destroy(struct cgroup *);
static int blkiocg_populate(struct cgroup_subsys *, struct cgroup *);
/* for encoding cft->private value on file */
#define BLKIOFILE_PRIVATE(x, val) (((x) << 16) | (val))
/* What policy owns the file, proportional or throttle */
#define BLKIOFILE_POLICY(val) (((val) >> 16) & 0xffff)
#define BLKIOFILE_ATTR(val) ((val) & 0xffff)
struct cgroup_subsys blkio_subsys = {
.name = "blkio",
.create = blkiocg_create,
.can_attach = blkiocg_can_attach,
.attach = blkiocg_attach,
.destroy = blkiocg_destroy,
.populate = blkiocg_populate,
#ifdef CONFIG_BLK_CGROUP
/* note: blkio_subsys_id is otherwise defined in blk-cgroup.h */
.subsys_id = blkio_subsys_id,
#endif
.use_id = 1,
.module = THIS_MODULE,
};
EXPORT_SYMBOL_GPL(blkio_subsys);
static inline void blkio_policy_insert_node(struct blkio_cgroup *blkcg,
struct blkio_policy_node *pn)
{
@ -1537,14 +1515,9 @@ struct cftype blkio_files[] = {
.read_map = blkiocg_file_read_map,
},
#endif
{ } /* terminate */
};
static int blkiocg_populate(struct cgroup_subsys *subsys, struct cgroup *cgroup)
{
return cgroup_add_files(cgroup, subsys, blkio_files,
ARRAY_SIZE(blkio_files));
}
static void blkiocg_destroy(struct cgroup *cgroup)
{
struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgroup);
@ -1658,6 +1631,22 @@ static void blkiocg_attach(struct cgroup *cgrp, struct cgroup_taskset *tset)
}
}
struct cgroup_subsys blkio_subsys = {
.name = "blkio",
.create = blkiocg_create,
.can_attach = blkiocg_can_attach,
.attach = blkiocg_attach,
.destroy = blkiocg_destroy,
#ifdef CONFIG_BLK_CGROUP
/* note: blkio_subsys_id is otherwise defined in blk-cgroup.h */
.subsys_id = blkio_subsys_id,
#endif
.base_cftypes = blkio_files,
.use_id = 1,
.module = THIS_MODULE,
};
EXPORT_SYMBOL_GPL(blkio_subsys);
void blkio_policy_register(struct blkio_policy_type *blkiop)
{
spin_lock(&blkio_list_lock);

81
include/linux/cgroup.h
View File

@ -16,6 +16,7 @@
#include <linux/prio_heap.h>
#include <linux/rwsem.h>
#include <linux/idr.h>
#include <linux/workqueue.h>
#ifdef CONFIG_CGROUPS
@ -76,12 +77,16 @@ struct cgroup_subsys_state {
unsigned long flags;
/* ID for this css, if possible */
struct css_id __rcu *id;
/* Used to put @cgroup->dentry on the last css_put() */
struct work_struct dput_work;
};
/* bits in struct cgroup_subsys_state flags field */
enum {
CSS_ROOT, /* This CSS is the root of the subsystem */
CSS_REMOVED, /* This CSS is dead */
CSS_CLEAR_CSS_REFS, /* @ss->__DEPRECATED_clear_css_refs */
};
/* Caller must verify that the css is not for root cgroup */
@ -115,16 +120,12 @@ static inline bool css_is_removed(struct cgroup_subsys_state *css)
* the css has been destroyed.
*/
extern bool __css_tryget(struct cgroup_subsys_state *css);
static inline bool css_tryget(struct cgroup_subsys_state *css)
{
if (test_bit(CSS_ROOT, &css->flags))
return true;
while (!atomic_inc_not_zero(&css->refcnt)) {
if (test_bit(CSS_REMOVED, &css->flags))
return false;
cpu_relax();
}
return true;
return __css_tryget(css);
}
/*
@ -132,11 +133,11 @@ static inline bool css_tryget(struct cgroup_subsys_state *css)
* css_get() or css_tryget()
*/
extern void __css_put(struct cgroup_subsys_state *css, int count);
extern void __css_put(struct cgroup_subsys_state *css);
static inline void css_put(struct cgroup_subsys_state *css)
{
if (!test_bit(CSS_ROOT, &css->flags))
__css_put(css, 1);
__css_put(css);
}
/* bits in struct cgroup flags field */
@ -175,6 +176,7 @@ struct cgroup {
*/
struct list_head sibling; /* my parent's children */
struct list_head children; /* my children */
struct list_head files; /* my files */
struct cgroup *parent; /* my parent */
struct dentry __rcu *dentry; /* cgroup fs entry, RCU protected */
@ -191,6 +193,9 @@ struct cgroup {
*/
struct list_head css_sets;
struct list_head allcg_node; /* cgroupfs_root->allcg_list */
struct list_head cft_q_node; /* used during cftype add/rm */
/*
* Linked list running through all cgroups that can
* potentially be reaped by the release agent. Protected by
@ -275,11 +280,17 @@ struct cgroup_map_cb {
* - the 'cftype' of the file is file->f_dentry->d_fsdata
*/
#define MAX_CFTYPE_NAME 64
/* cftype->flags */
#define CFTYPE_ONLY_ON_ROOT (1U << 0) /* only create on root cg */
#define CFTYPE_NOT_ON_ROOT (1U << 1) /* don't create onp root cg */
#define MAX_CFTYPE_NAME 64
struct cftype {
/*
* By convention, the name should begin with the name of the
* subsystem, followed by a period
* subsystem, followed by a period. Zero length string indicates
* end of cftype array.
*/
char name[MAX_CFTYPE_NAME];
int private;
@ -295,6 +306,9 @@ struct cftype {
*/
size_t max_write_len;
/* CFTYPE_* flags */
unsigned int flags;
int (*open)(struct inode *inode, struct file *file);
ssize_t (*read)(struct cgroup *cgrp, struct cftype *cft,
struct file *file,
@ -373,6 +387,16 @@ struct cftype {
struct eventfd_ctx *eventfd);
};
/*
* cftype_sets describe cftypes belonging to a subsystem and are chained at
* cgroup_subsys->cftsets. Each cftset points to an array of cftypes
* terminated by zero length name.
*/
struct cftype_set {
struct list_head node; /* chained at subsys->cftsets */
const struct cftype *cfts;
};
struct cgroup_scanner {
struct cgroup *cg;
int (*test_task)(struct task_struct *p, struct cgroup_scanner *scan);
@ -382,21 +406,8 @@ struct cgroup_scanner {
void *data;
};
/*
* Add a new file to the given cgroup directory. Should only be
* called by subsystems from within a populate() method
*/
int cgroup_add_file(struct cgroup *cgrp, struct cgroup_subsys *subsys,
const struct cftype *cft);
/*
* Add a set of new files to the given cgroup directory. Should
* only be called by subsystems from within a populate() method
*/
int cgroup_add_files(struct cgroup *cgrp,
struct cgroup_subsys *subsys,
const struct cftype cft[],
int count);
int cgroup_add_cftypes(struct cgroup_subsys *ss, const struct cftype *cfts);
int cgroup_rm_cftypes(struct cgroup_subsys *ss, const struct cftype *cfts);
int cgroup_is_removed(const struct cgroup *cgrp);
@ -461,7 +472,6 @@ struct cgroup_subsys {
void (*fork)(struct task_struct *task);
void (*exit)(struct cgroup *cgrp, struct cgroup *old_cgrp,
struct task_struct *task);
int (*populate)(struct cgroup_subsys *ss, struct cgroup *cgrp);
void (*post_clone)(struct cgroup *cgrp);
void (*bind)(struct cgroup *root);
@ -474,6 +484,18 @@ struct cgroup_subsys {
* (not available in early_init time.)
*/
bool use_id;
/*
* If %true, cgroup removal will try to clear css refs by retrying
* ss->pre_destroy() until there's no css ref left. This behavior
* is strictly for backward compatibility and will be removed as
* soon as the current user (memcg) is updated.
*
* If %false, ss->pre_destroy() can't fail and cgroup removal won't
* wait for css refs to drop to zero before proceeding.
*/
bool __DEPRECATED_clear_css_refs;
#define MAX_CGROUP_TYPE_NAMELEN 32
const char *name;
@ -500,6 +522,13 @@ struct cgroup_subsys {
struct idr idr;
spinlock_t id_lock;
/* list of cftype_sets */
struct list_head cftsets;
/* base cftypes, automatically [de]registered with subsys itself */
struct cftype *base_cftypes;
struct cftype_set base_cftset;
/* should be defined only by modular subsystems */
struct module *module;
};

2
include/linux/res_counter.h
View File

@ -116,7 +116,7 @@ void res_counter_init(struct res_counter *counter, struct res_counter *parent);
*/
int __must_check res_counter_charge_locked(struct res_counter *counter,
unsigned long val);
unsigned long val, bool force);
int __must_check res_counter_charge(struct res_counter *counter,
unsigned long val, struct res_counter **limit_fail_at);
int __must_check res_counter_charge_nofail(struct res_counter *counter,

12
include/net/sock.h
View File

@ -70,16 +70,16 @@
struct cgroup;
struct cgroup_subsys;
#ifdef CONFIG_NET
int mem_cgroup_sockets_init(struct cgroup *cgrp, struct cgroup_subsys *ss);
void mem_cgroup_sockets_destroy(struct cgroup *cgrp);
int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss);
void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg);
#else
static inline
int mem_cgroup_sockets_init(struct cgroup *cgrp, struct cgroup_subsys *ss)
int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
{
return 0;
}
static inline
void mem_cgroup_sockets_destroy(struct cgroup *cgrp)
void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg)
{
}
#endif
@ -914,9 +914,9 @@ struct proto {
* This function has to setup any files the protocol want to
* appear in the kmem cgroup filesystem.
*/
int (*init_cgroup)(struct cgroup *cgrp,
int (*init_cgroup)(struct mem_cgroup *memcg,
struct cgroup_subsys *ss);
void (*destroy_cgroup)(struct cgroup *cgrp);
void (*destroy_cgroup)(struct mem_cgroup *memcg);
struct cg_proto *(*proto_cgroup)(struct mem_cgroup *memcg);
#endif
};

4
include/net/tcp_memcontrol.h
View File

@ -12,8 +12,8 @@ struct tcp_memcontrol {
};
struct cg_proto *tcp_proto_cgroup(struct mem_cgroup *memcg);
int tcp_init_cgroup(struct cgroup *cgrp, struct cgroup_subsys *ss);
void tcp_destroy_cgroup(struct cgroup *cgrp);
int tcp_init_cgroup(struct mem_cgroup *memcg, struct cgroup_subsys *ss);
void tcp_destroy_cgroup(struct mem_cgroup *memcg);
unsigned long long tcp_max_memory(const struct mem_cgroup *memcg);
void tcp_prot_mem(struct mem_cgroup *memcg, long val, int idx);
#endif /* _TCP_MEMCG_H */

558
kernel/cgroup.c
View File

@ -60,9 +60,13 @@
#include <linux/eventfd.h>
#include <linux/poll.h>
#include <linux/flex_array.h> /* used in cgroup_attach_proc */
#include <linux/kthread.h>
#include <linux/atomic.h>
/* css deactivation bias, makes css->refcnt negative to deny new trygets */
#define CSS_DEACT_BIAS INT_MIN
/*
* cgroup_mutex is the master lock. Any modification to cgroup or its
* hierarchy must be performed while holding it.
@ -127,6 +131,9 @@ struct cgroupfs_root {
/* A list running through the active hierarchies */
struct list_head root_list;
/* All cgroups on this root, cgroup_mutex protected */
struct list_head allcg_list;
/* Hierarchy-specific flags */
unsigned long flags;
@ -144,6 +151,15 @@ struct cgroupfs_root {
*/
static struct cgroupfs_root rootnode;
/*
* cgroupfs file entry, pointed to from leaf dentry->d_fsdata.
*/
struct cfent {
struct list_head node;
struct dentry *dentry;
struct cftype *type;
};
/*
* CSS ID -- ID per subsys's Cgroup Subsys State(CSS). used only when
* cgroup_subsys->use_id != 0.
@ -239,6 +255,14 @@ int cgroup_lock_is_held(void)
EXPORT_SYMBOL_GPL(cgroup_lock_is_held);
/* the current nr of refs, always >= 0 whether @css is deactivated or not */
static int css_refcnt(struct cgroup_subsys_state *css)
{
int v = atomic_read(&css->refcnt);
return v >= 0 ? v : v - CSS_DEACT_BIAS;
}
/* convenient tests for these bits */
inline int cgroup_is_removed(const struct cgroup *cgrp)
{
@ -279,6 +303,21 @@ list_for_each_entry(_ss, &_root->subsys_list, sibling)
#define for_each_active_root(_root) \
list_for_each_entry(_root, &roots, root_list)
static inline struct cgroup *__d_cgrp(struct dentry *dentry)
{
return dentry->d_fsdata;
}
static inline struct cfent *__d_cfe(struct dentry *dentry)
{
return dentry->d_fsdata;
}
static inline struct cftype *__d_cft(struct dentry *dentry)
{
return __d_cfe(dentry)->type;
}
/* the list of cgroups eligible for automatic release. Protected by
* release_list_lock */
static LIST_HEAD(release_list);
@ -816,12 +855,17 @@ static int cgroup_call_pre_destroy(struct cgroup *cgrp)
struct cgroup_subsys *ss;
int ret = 0;
for_each_subsys(cgrp->root, ss)
if (ss->pre_destroy) {
ret = ss->pre_destroy(cgrp);
if (ret)
break;
for_each_subsys(cgrp->root, ss) {
if (!ss->pre_destroy)
continue;
ret = ss->pre_destroy(cgrp);
if (ret) {
/* ->pre_destroy() failure is being deprecated */
WARN_ON_ONCE(!ss->__DEPRECATED_clear_css_refs);
break;
}
}
return ret;
}
@ -864,6 +908,14 @@ static void cgroup_diput(struct dentry *dentry, struct inode *inode)
BUG_ON(!list_empty(&cgrp->pidlists));
kfree_rcu(cgrp, rcu_head);
} else {
struct cfent *cfe = __d_cfe(dentry);
struct cgroup *cgrp = dentry->d_parent->d_fsdata;
WARN_ONCE(!list_empty(&cfe->node) &&
cgrp != &cgrp->root->top_cgroup,
"cfe still linked for %s\n", cfe->type->name);
kfree(cfe);
}
iput(inode);
}
@ -882,34 +934,36 @@ static void remove_dir(struct dentry *d)
dput(parent);
}
static void cgroup_clear_directory(struct dentry *dentry)
static int cgroup_rm_file(struct cgroup *cgrp, const struct cftype *cft)
{
struct list_head *node;
struct cfent *cfe;
BUG_ON(!mutex_is_locked(&dentry->d_inode->i_mutex));
spin_lock(&dentry->d_lock);
node = dentry->d_subdirs.next;
while (node != &dentry->d_subdirs) {
struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
lockdep_assert_held(&cgrp->dentry->d_inode->i_mutex);
lockdep_assert_held(&cgroup_mutex);
spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED);
list_del_init(node);
if (d->d_inode) {
/* This should never be called on a cgroup
* directory with child cgroups */
BUG_ON(d->d_inode->i_mode & S_IFDIR);
dget_dlock(d);
spin_unlock(&d->d_lock);
spin_unlock(&dentry->d_lock);
d_delete(d);
simple_unlink(dentry->d_inode, d);
dput(d);
spin_lock(&dentry->d_lock);
} else
spin_unlock(&d->d_lock);
node = dentry->d_subdirs.next;
list_for_each_entry(cfe, &cgrp->files, node) {
struct dentry *d = cfe->dentry;
if (cft && cfe->type != cft)
continue;
dget(d);
d_delete(d);
simple_unlink(d->d_inode, d);
list_del_init(&cfe->node);
dput(d);
return 0;
}
spin_unlock(&dentry->d_lock);
return -ENOENT;
}
static void cgroup_clear_directory(struct dentry *dir)
{
struct cgroup *cgrp = __d_cgrp(dir);
while (!list_empty(&cgrp->files))
cgroup_rm_file(cgrp, NULL);
}
/*
@ -1294,6 +1348,11 @@ static int cgroup_remount(struct super_block *sb, int *flags, char *data)
if (ret)
goto out_unlock;
/* See feature-removal-schedule.txt */
if (opts.subsys_bits != root->actual_subsys_bits || opts.release_agent)
pr_warning("cgroup: option changes via remount are deprecated (pid=%d comm=%s)\n",
task_tgid_nr(current), current->comm);
/* Don't allow flags or name to change at remount */
if (opts.flags != root->flags ||
(opts.name && strcmp(opts.name, root->name))) {
@ -1308,7 +1367,8 @@ static int cgroup_remount(struct super_block *sb, int *flags, char *data)
goto out_unlock;
}
/* (re)populate subsystem files */
/* clear out any existing files and repopulate subsystem files */
cgroup_clear_directory(cgrp->dentry);
cgroup_populate_dir(cgrp);
if (opts.release_agent)
@ -1333,6 +1393,7 @@ static void init_cgroup_housekeeping(struct cgroup *cgrp)
{
INIT_LIST_HEAD(&cgrp->sibling);
INIT_LIST_HEAD(&cgrp->children);
INIT_LIST_HEAD(&cgrp->files);
INIT_LIST_HEAD(&cgrp->css_sets);
INIT_LIST_HEAD(&cgrp->release_list);
INIT_LIST_HEAD(&cgrp->pidlists);
@ -1344,11 +1405,14 @@ static void init_cgroup_housekeeping(struct cgroup *cgrp)
static void init_cgroup_root(struct cgroupfs_root *root)
{
struct cgroup *cgrp = &root->top_cgroup;
INIT_LIST_HEAD(&root->subsys_list);
INIT_LIST_HEAD(&root->root_list);
INIT_LIST_HEAD(&root->allcg_list);
root->number_of_cgroups = 1;
cgrp->root = root;
cgrp->top_cgroup = cgrp;
list_add_tail(&cgrp->allcg_node, &root->allcg_list);
init_cgroup_housekeeping(cgrp);
}
@ -1692,16 +1756,6 @@ static struct file_system_type cgroup_fs_type = {
static struct kobject *cgroup_kobj;
static inline struct cgroup *__d_cgrp(struct dentry *dentry)
{
return dentry->d_fsdata;
}
static inline struct cftype *__d_cft(struct dentry *dentry)
{
return dentry->d_fsdata;
}
/**
* cgroup_path - generate the path of a cgroup
* @cgrp: the cgroup in question
@ -2172,6 +2226,18 @@ retry_find_task:
if (threadgroup)
tsk = tsk->group_leader;
/*
* Workqueue threads may acquire PF_THREAD_BOUND and become
* trapped in a cpuset, or RT worker may be born in a cgroup
* with no rt_runtime allocated. Just say no.
*/
if (tsk == kthreadd_task || (tsk->flags & PF_THREAD_BOUND)) {
ret = -EINVAL;
rcu_read_unlock();
goto out_unlock_cgroup;
}
get_task_struct(tsk);
rcu_read_unlock();
@ -2603,50 +2669,191 @@ static umode_t cgroup_file_mode(const struct cftype *cft)
return mode;
}
int cgroup_add_file(struct cgroup *cgrp,
struct cgroup_subsys *subsys,
const struct cftype *cft)
static int cgroup_add_file(struct cgroup *cgrp, struct cgroup_subsys *subsys,
const struct cftype *cft)
{
struct dentry *dir = cgrp->dentry;
struct cgroup *parent = __d_cgrp(dir);
struct dentry *dentry;
struct cfent *cfe;
int error;
umode_t mode;
char name[MAX_CGROUP_TYPE_NAMELEN + MAX_CFTYPE_NAME + 2] = { 0 };
/* does @cft->flags tell us to skip creation on @cgrp? */
if ((cft->flags & CFTYPE_NOT_ON_ROOT) && !cgrp->parent)
return 0;
if ((cft->flags & CFTYPE_ONLY_ON_ROOT) && cgrp->parent)
return 0;
if (subsys && !test_bit(ROOT_NOPREFIX, &cgrp->root->flags)) {
strcpy(name, subsys->name);
strcat(name, ".");
}
strcat(name, cft->name);
BUG_ON(!mutex_is_locked(&dir->d_inode->i_mutex));
cfe = kzalloc(sizeof(*cfe), GFP_KERNEL);
if (!cfe)
return -ENOMEM;
dentry = lookup_one_len(name, dir, strlen(name));
if (!IS_ERR(dentry)) {
mode = cgroup_file_mode(cft);
error = cgroup_create_file(dentry, mode | S_IFREG,
cgrp->root->sb);
if (!error)
dentry->d_fsdata = (void *)cft;
dput(dentry);
} else
if (IS_ERR(dentry)) {
error = PTR_ERR(dentry);
goto out;
}
mode = cgroup_file_mode(cft);
error = cgroup_create_file(dentry, mode | S_IFREG, cgrp->root->sb);
if (!error) {
cfe->type = (void *)cft;
cfe->dentry = dentry;
dentry->d_fsdata = cfe;
list_add_tail(&cfe->node, &parent->files);
cfe = NULL;
}
dput(dentry);
out:
kfree(cfe);
return error;
}
EXPORT_SYMBOL_GPL(cgroup_add_file);
int cgroup_add_files(struct cgroup *cgrp,
struct cgroup_subsys *subsys,
const struct cftype cft[],
int count)
static int cgroup_addrm_files(struct cgroup *cgrp, struct cgroup_subsys *subsys,
const struct cftype cfts[], bool is_add)
{
int i, err;
for (i = 0; i < count; i++) {
err = cgroup_add_file(cgrp, subsys, &cft[i]);
if (err)
return err;
const struct cftype *cft;
int err, ret = 0;
for (cft = cfts; cft->name[0] != '\0'; cft++) {
if (is_add)
err = cgroup_add_file(cgrp, subsys, cft);
else
err = cgroup_rm_file(cgrp, cft);
if (err) {
pr_warning("cgroup_addrm_files: failed to %s %s, err=%d\n",
is_add ? "add" : "remove", cft->name, err);
ret = err;
}
}
return ret;
}
static DEFINE_MUTEX(cgroup_cft_mutex);
static void cgroup_cfts_prepare(void)
__acquires(&cgroup_cft_mutex) __acquires(&cgroup_mutex)
{
/*
* Thanks to the entanglement with vfs inode locking, we can't walk
* the existing cgroups under cgroup_mutex and create files.
* Instead, we increment reference on all cgroups and build list of
* them using @cgrp->cft_q_node. Grab cgroup_cft_mutex to ensure
* exclusive access to the field.
*/
mutex_lock(&cgroup_cft_mutex);
mutex_lock(&cgroup_mutex);
}
static void cgroup_cfts_commit(struct cgroup_subsys *ss,
const struct cftype *cfts, bool is_add)
__releases(&cgroup_mutex) __releases(&cgroup_cft_mutex)
{
LIST_HEAD(pending);
struct cgroup *cgrp, *n;
/* %NULL @cfts indicates abort and don't bother if @ss isn't attached */
if (cfts && ss->root != &rootnode) {
list_for_each_entry(cgrp, &ss->root->allcg_list, allcg_node) {
dget(cgrp->dentry);
list_add_tail(&cgrp->cft_q_node, &pending);
}
}
mutex_unlock(&cgroup_mutex);
/*
* All new cgroups will see @cfts update on @ss->cftsets. Add/rm
* files for all cgroups which were created before.
*/
list_for_each_entry_safe(cgrp, n, &pending, cft_q_node) {
struct inode *inode = cgrp->dentry->d_inode;
mutex_lock(&inode->i_mutex);
mutex_lock(&cgroup_mutex);
if (!cgroup_is_removed(cgrp))
cgroup_addrm_files(cgrp, ss, cfts, is_add);
mutex_unlock(&cgroup_mutex);
mutex_unlock(&inode->i_mutex);
list_del_init(&cgrp->cft_q_node);
dput(cgrp->dentry);
}
mutex_unlock(&cgroup_cft_mutex);
}
/**
* cgroup_add_cftypes - add an array of cftypes to a subsystem
* @ss: target cgroup subsystem
* @cfts: zero-length name terminated array of cftypes
*
* Register @cfts to @ss. Files described by @cfts are created for all
* existing cgroups to which @ss is attached and all future cgroups will
* have them too. This function can be called anytime whether @ss is
* attached or not.
*
* Returns 0 on successful registration, -errno on failure. Note that this
* function currently returns 0 as long as @cfts registration is successful
* even if some file creation attempts on existing cgroups fail.
*/
int cgroup_add_cftypes(struct cgroup_subsys *ss, const struct cftype *cfts)
{
struct cftype_set *set;
set = kzalloc(sizeof(*set), GFP_KERNEL);
if (!set)
return -ENOMEM;
cgroup_cfts_prepare();
set->cfts = cfts;
list_add_tail(&set->node, &ss->cftsets);
cgroup_cfts_commit(ss, cfts, true);
return 0;
}
EXPORT_SYMBOL_GPL(cgroup_add_files);
EXPORT_SYMBOL_GPL(cgroup_add_cftypes);
/**
* cgroup_rm_cftypes - remove an array of cftypes from a subsystem
* @ss: target cgroup subsystem
* @cfts: zero-length name terminated array of cftypes
*
* Unregister @cfts from @ss. Files described by @cfts are removed from
* all existing cgroups to which @ss is attached and all future cgroups
* won't have them either. This function can be called anytime whether @ss
* is attached or not.
*
* Returns 0 on successful unregistration, -ENOENT if @cfts is not
* registered with @ss.
*/
int cgroup_rm_cftypes(struct cgroup_subsys *ss, const struct cftype *cfts)
{
struct cftype_set *set;
cgroup_cfts_prepare();
list_for_each_entry(set, &ss->cftsets, node) {
if (set->cfts == cfts) {
list_del_init(&set->node);
cgroup_cfts_commit(ss, cfts, false);
return 0;
}
}
cgroup_cfts_commit(ss, NULL, false);
return -ENOENT;
}
/**
* cgroup_task_count - count the number of tasks in a cgroup.
@ -3625,13 +3832,14 @@ static struct cftype files[] = {
.read_u64 = cgroup_clone_children_read,
.write_u64 = cgroup_clone_children_write,
},
};
static struct cftype cft_release_agent = {
.name = "release_agent",
.read_seq_string = cgroup_release_agent_show,
.write_string = cgroup_release_agent_write,
.max_write_len = PATH_MAX,
{
.name = "release_agent",
.flags = CFTYPE_ONLY_ON_ROOT,
.read_seq_string = cgroup_release_agent_show,
.write_string = cgroup_release_agent_write,
.max_write_len = PATH_MAX,
},
{ } /* terminate */
};
static int cgroup_populate_dir(struct cgroup *cgrp)
@ -3639,22 +3847,18 @@ static int cgroup_populate_dir(struct cgroup *cgrp)
int err;
struct cgroup_subsys *ss;
/* First clear out any existing files */
cgroup_clear_directory(cgrp->dentry);
err = cgroup_add_files(cgrp, NULL, files, ARRAY_SIZE(files));
err = cgroup_addrm_files(cgrp, NULL, files, true);
if (err < 0)
return err;
if (cgrp == cgrp->top_cgroup) {
if ((err = cgroup_add_file(cgrp, NULL, &cft_release_agent)) < 0)
return err;
/* process cftsets of each subsystem */
for_each_subsys(cgrp->root, ss) {
struct cftype_set *set;
list_for_each_entry(set, &ss->cftsets, node)
cgroup_addrm_files(cgrp, ss, set->cfts, true);
}
for_each_subsys(cgrp->root, ss) {
if (ss->populate && (err = ss->populate(ss, cgrp)) < 0)
return err;
}
/* This cgroup is ready now */
for_each_subsys(cgrp->root, ss) {
struct cgroup_subsys_state *css = cgrp->subsys[ss->subsys_id];
@ -3670,6 +3874,14 @@ static int cgroup_populate_dir(struct cgroup *cgrp)
return 0;
}
static void css_dput_fn(struct work_struct *work)
{
struct cgroup_subsys_state *css =
container_of(work, struct cgroup_subsys_state, dput_work);
dput(css->cgroup->dentry);
}
static void init_cgroup_css(struct cgroup_subsys_state *css,
struct cgroup_subsys *ss,
struct cgroup *cgrp)
@ -3682,6 +3894,16 @@ static void init_cgroup_css(struct cgroup_subsys_state *css,
set_bit(CSS_ROOT, &css->flags);
BUG_ON(cgrp->subsys[ss->subsys_id]);
cgrp->subsys[ss->subsys_id] = css;
/*
* If !clear_css_refs, css holds an extra ref to @cgrp->dentry
* which is put on the last css_put(). dput() requires process
* context, which css_put() may be called without. @css->dput_work
* will be used to invoke dput() asynchronously from css_put().
*/
INIT_WORK(&css->dput_work, css_dput_fn);
if (ss->__DEPRECATED_clear_css_refs)
set_bit(CSS_CLEAR_CSS_REFS, &css->flags);
}
static void cgroup_lock_hierarchy(struct cgroupfs_root *root)
@ -3784,9 +4006,16 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry,
if (err < 0)
goto err_remove;
/* If !clear_css_refs, each css holds a ref to the cgroup's dentry */
for_each_subsys(root, ss)
if (!ss->__DEPRECATED_clear_css_refs)
dget(dentry);
/* The cgroup directory was pre-locked for us */
BUG_ON(!mutex_is_locked(&cgrp->dentry->d_inode->i_mutex));
list_add_tail(&cgrp->allcg_node, &root->allcg_list);
err = cgroup_populate_dir(cgrp);
/* If err < 0, we have a half-filled directory - oh well ;) */
@ -3826,18 +4055,19 @@ static int cgroup_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
return cgroup_create(c_parent, dentry, mode | S_IFDIR);
}
/*
* Check the reference count on each subsystem. Since we already
* established that there are no tasks in the cgroup, if the css refcount
* is also 1, then there should be no outstanding references, so the
* subsystem is safe to destroy. We scan across all subsystems rather than
* using the per-hierarchy linked list of mounted subsystems since we can
* be called via check_for_release() with no synchronization other than
* RCU, and the subsystem linked list isn't RCU-safe.
*/
static int cgroup_has_css_refs(struct cgroup *cgrp)
{
/* Check the reference count on each subsystem. Since we
* already established that there are no tasks in the
* cgroup, if the css refcount is also 1, then there should
* be no outstanding references, so the subsystem is safe to
* destroy. We scan across all subsystems rather than using
* the per-hierarchy linked list of mounted subsystems since
* we can be called via check_for_release() with no
* synchronization other than RCU, and the subsystem linked
* list isn't RCU-safe */
int i;
/*
* We won't need to lock the subsys array, because the subsystems
* we're concerned about aren't going anywhere since our cgroup root
@ -3846,17 +4076,21 @@ static int cgroup_has_css_refs(struct cgroup *cgrp)
for (i = 0; i < CGROUP_SUBSYS_COUNT; i++) {
struct cgroup_subsys *ss = subsys[i];
struct cgroup_subsys_state *css;
/* Skip subsystems not present or not in this hierarchy */
if (ss == NULL || ss->root != cgrp->root)
continue;
css = cgrp->subsys[ss->subsys_id];
/* When called from check_for_release() it's possible
/*
* When called from check_for_release() it's possible
* that by this point the cgroup has been removed
* and the css deleted. But a false-positive doesn't
* matter, since it can only happen if the cgroup
* has been deleted and hence no longer needs the
* release agent to be called anyway. */
if (css && (atomic_read(&css->refcnt) > 1))
* release agent to be called anyway.
*/
if (css && css_refcnt(css) > 1)
return 1;
}
return 0;
@ -3866,51 +4100,63 @@ static int cgroup_has_css_refs(struct cgroup *cgrp)
* Atomically mark all (or else none) of the cgroup's CSS objects as
* CSS_REMOVED. Return true on success, or false if the cgroup has
* busy subsystems. Call with cgroup_mutex held
*
* Depending on whether a subsys has __DEPRECATED_clear_css_refs set or
* not, cgroup removal behaves differently.
*
* If clear is set, css refcnt for the subsystem should be zero before
* cgroup removal can be committed. This is implemented by
* CGRP_WAIT_ON_RMDIR and retry logic around ->pre_destroy(), which may be
* called multiple times until all css refcnts reach zero and is allowed to
* veto removal on any invocation. This behavior is deprecated and will be
* removed as soon as the existing user (memcg) is updated.
*
* If clear is not set, each css holds an extra reference to the cgroup's
* dentry and cgroup removal proceeds regardless of css refs.
* ->pre_destroy() will be called at least once and is not allowed to fail.
* On the last put of each css, whenever that may be, the extra dentry ref
* is put so that dentry destruction happens only after all css's are
* released.
*/
static int cgroup_clear_css_refs(struct cgroup *cgrp)
{
struct cgroup_subsys *ss;
unsigned long flags;
bool failed = false;
local_irq_save(flags);
/*
* Block new css_tryget() by deactivating refcnt. If all refcnts
* for subsystems w/ clear_css_refs set were 1 at the moment of
* deactivation, we succeeded.
*/
for_each_subsys(cgrp->root, ss) {
struct cgroup_subsys_state *css = cgrp->subsys[ss->subsys_id];
int refcnt;
while (1) {
/* We can only remove a CSS with a refcnt==1 */
refcnt = atomic_read(&css->refcnt);
if (refcnt > 1) {
failed = true;
goto done;
}
BUG_ON(!refcnt);
/*
* Drop the refcnt to 0 while we check other
* subsystems. This will cause any racing
* css_tryget() to spin until we set the
* CSS_REMOVED bits or abort
*/
if (atomic_cmpxchg(&css->refcnt, refcnt, 0) == refcnt)
break;
cpu_relax();
}
WARN_ON(atomic_read(&css->refcnt) < 0);
atomic_add(CSS_DEACT_BIAS, &css->refcnt);
if (ss->__DEPRECATED_clear_css_refs)
failed |= css_refcnt(css) != 1;
}
done:
/*
* If succeeded, set REMOVED and put all the base refs; otherwise,
* restore refcnts to positive values. Either way, all in-progress
* css_tryget() will be released.
*/
for_each_subsys(cgrp->root, ss) {
struct cgroup_subsys_state *css = cgrp->subsys[ss->subsys_id];
if (failed) {
/*
* Restore old refcnt if we previously managed
* to clear it from 1 to 0
*/
if (!atomic_read(&css->refcnt))
atomic_set(&css->refcnt, 1);
} else {
/* Commit the fact that the CSS is removed */
if (!failed) {
set_bit(CSS_REMOVED, &css->flags);
css_put(css);
} else {
atomic_sub(CSS_DEACT_BIAS, &css->refcnt);
}
}
local_irq_restore(flags);
return !failed;
}
@ -3995,6 +4241,8 @@ again:
list_del_init(&cgrp->sibling);
cgroup_unlock_hierarchy(cgrp->root);
list_del_init(&cgrp->allcg_node);
d = dget(cgrp->dentry);
cgroup_d_remove_dir(d);
@ -4021,12 +4269,29 @@ again:
return 0;
}
static void __init_or_module cgroup_init_cftsets(struct cgroup_subsys *ss)
{
INIT_LIST_HEAD(&ss->cftsets);
/*
* base_cftset is embedded in subsys itself, no need to worry about
* deregistration.
*/
if (ss->base_cftypes) {
ss->base_cftset.cfts = ss->base_cftypes;
list_add_tail(&ss->base_cftset.node, &ss->cftsets);
}
}
static void __init cgroup_init_subsys(struct cgroup_subsys *ss)
{
struct cgroup_subsys_state *css;
printk(KERN_INFO "Initializing cgroup subsys %s\n", ss->name);
/* init base cftset */
cgroup_init_cftsets(ss);
/* Create the top cgroup state for this subsystem */
list_add(&ss->sibling, &rootnode.subsys_list);
ss->root = &rootnode;
@ -4096,6 +4361,9 @@ int __init_or_module cgroup_load_subsys(struct cgroup_subsys *ss)
return 0;
}
/* init base cftset */
cgroup_init_cftsets(ss);
/*
* need to register a subsys id before anything else - for example,
* init_cgroup_css needs it.
@ -4685,21 +4953,41 @@ static void check_for_release(struct cgroup *cgrp)
}
/* Caller must verify that the css is not for root cgroup */
void __css_put(struct cgroup_subsys_state *css, int count)
bool __css_tryget(struct cgroup_subsys_state *css)
{
do {
int v = css_refcnt(css);
if (atomic_cmpxchg(&css->refcnt, v, v + 1) == v)
return true;
cpu_relax();
} while (!test_bit(CSS_REMOVED, &css->flags));
return false;
}
EXPORT_SYMBOL_GPL(__css_tryget);
/* Caller must verify that the css is not for root cgroup */
void __css_put(struct cgroup_subsys_state *css)
{
struct cgroup *cgrp = css->cgroup;
int val;
rcu_read_lock();
val = atomic_sub_return(count, &css->refcnt);
if (val == 1) {
atomic_dec(&css->refcnt);
switch (css_refcnt(css)) {
case 1:
if (notify_on_release(cgrp)) {
set_bit(CGRP_RELEASABLE, &cgrp->flags);
check_for_release(cgrp);
}
cgroup_wakeup_rmdir_waiter(cgrp);
break;
case 0:
if (!test_bit(CSS_CLEAR_CSS_REFS, &css->flags))
schedule_work(&css->dput_work);
break;
}
rcu_read_unlock();
WARN_ON_ONCE(val < 1);
}
EXPORT_SYMBOL_GPL(__css_put);
@ -4818,7 +5106,7 @@ unsigned short css_id(struct cgroup_subsys_state *css)
* on this or this is under rcu_read_lock(). Once css->id is allocated,
* it's unchanged until freed.
*/
cssid = rcu_dereference_check(css->id, atomic_read(&css->refcnt));
cssid = rcu_dereference_check(css->id, css_refcnt(css));
if (cssid)
return cssid->id;
@ -4830,7 +5118,7 @@ unsigned short css_depth(struct cgroup_subsys_state *css)
{
struct css_id *cssid;
cssid = rcu_dereference_check(css->id, atomic_read(&css->refcnt));
cssid = rcu_dereference_check(css->id, css_refcnt(css));
if (cssid)
return cssid->depth;
@ -5211,19 +5499,15 @@ static struct cftype debug_files[] = {
.name = "releasable",
.read_u64 = releasable_read,
},
};
static int debug_populate(struct cgroup_subsys *ss, struct cgroup *cont)
{
return cgroup_add_files(cont, ss, debug_files,
ARRAY_SIZE(debug_files));
}
{ } /* terminate */
};
struct cgroup_subsys debug_subsys = {
.name = "debug",
.create = debug_create,
.destroy = debug_destroy,
.populate = debug_populate,
.subsys_id = debug_subsys_id,
.base_cftypes = debug_files,
};
#endif /* CONFIG_CGROUP_DEBUG */

11
kernel/cgroup_freezer.c
View File

@ -358,24 +358,19 @@ static int freezer_write(struct cgroup *cgroup,
static struct cftype files[] = {
{
.name = "state",
.flags = CFTYPE_NOT_ON_ROOT,
.read_seq_string = freezer_read,
.write_string = freezer_write,
},
{ } /* terminate */
};
static int freezer_populate(struct cgroup_subsys *ss, struct cgroup *cgroup)
{
if (!cgroup->parent)
return 0;
return cgroup_add_files(cgroup, ss, files, ARRAY_SIZE(files));
}
struct cgroup_subsys freezer_subsys = {
.name = "freezer",
.create = freezer_create,
.destroy = freezer_destroy,
.populate = freezer_populate,
.subsys_id = freezer_subsys_id,
.can_attach = freezer_can_attach,
.fork = freezer_fork,
.base_cftypes = files,
};

33
kernel/cpuset.c
View File

@ -1765,29 +1765,18 @@ static struct cftype files[] = {
.write_u64 = cpuset_write_u64,
.private = FILE_SPREAD_SLAB,
},
{
.name = "memory_pressure_enabled",
.flags = CFTYPE_ONLY_ON_ROOT,
.read_u64 = cpuset_read_u64,
.write_u64 = cpuset_write_u64,
.private = FILE_MEMORY_PRESSURE_ENABLED,
},
{ } /* terminate */
};
static struct cftype cft_memory_pressure_enabled = {
.name = "memory_pressure_enabled",
.read_u64 = cpuset_read_u64,
.write_u64 = cpuset_write_u64,
.private = FILE_MEMORY_PRESSURE_ENABLED,
};
static int cpuset_populate(struct cgroup_subsys *ss, struct cgroup *cont)
{
int err;
err = cgroup_add_files(cont, ss, files, ARRAY_SIZE(files));
if (err)
return err;
/* memory_pressure_enabled is in root cpuset only */
if (!cont->parent)
err = cgroup_add_file(cont, ss,
&cft_memory_pressure_enabled);
return err;
}
/*
* post_clone() is called during cgroup_create() when the
* clone_children mount argument was specified. The cgroup
@ -1887,9 +1876,9 @@ struct cgroup_subsys cpuset_subsys = {
.destroy = cpuset_destroy,
.can_attach = cpuset_can_attach,
.attach = cpuset_attach,
.populate = cpuset_populate,
.post_clone = cpuset_post_clone,
.subsys_id = cpuset_subsys_id,
.base_cftypes = files,
.early_init = 1,
};

77
kernel/res_counter.c
View File

@ -22,75 +22,70 @@ void res_counter_init(struct res_counter *counter, struct res_counter *parent)
counter->parent = parent;
}
int res_counter_charge_locked(struct res_counter *counter, unsigned long val)
int res_counter_charge_locked(struct res_counter *counter, unsigned long val,
bool force)
{
int ret = 0;
if (counter->usage + val > counter->limit) {
counter->failcnt++;
return -ENOMEM;
ret = -ENOMEM;
if (!force)
return ret;
}
counter->usage += val;
if (counter->usage > counter->max_usage)
counter->max_usage = counter->usage;
return 0;
}
int res_counter_charge(struct res_counter *counter, unsigned long val,
struct res_counter **limit_fail_at)
{
int ret;
unsigned long flags;
struct res_counter *c, *u;
*limit_fail_at = NULL;
local_irq_save(flags);
for (c = counter; c != NULL; c = c->parent) {
spin_lock(&c->lock);
ret = res_counter_charge_locked(c, val);
spin_unlock(&c->lock);
if (ret < 0) {
*limit_fail_at = c;
goto undo;
}
}
ret = 0;
goto done;
undo:
for (u = counter; u != c; u = u->parent) {
spin_lock(&u->lock);
res_counter_uncharge_locked(u, val);
spin_unlock(&u->lock);
}
done:
local_irq_restore(flags);
return ret;
}
int res_counter_charge_nofail(struct res_counter *counter, unsigned long val,
struct res_counter **limit_fail_at)
static int __res_counter_charge(struct res_counter *counter, unsigned long val,
struct res_counter **limit_fail_at, bool force)
{
int ret, r;
unsigned long flags;
struct res_counter *c;
struct res_counter *c, *u;
r = ret = 0;
*limit_fail_at = NULL;
local_irq_save(flags);
for (c = counter; c != NULL; c = c->parent) {
spin_lock(&c->lock);
r = res_counter_charge_locked(c, val);
if (r)
c->usage += val;
r = res_counter_charge_locked(c, val, force);
spin_unlock(&c->lock);
if (r < 0 && ret == 0) {
*limit_fail_at = c;
if (r < 0 && !ret) {
ret = r;
*limit_fail_at = c;
if (!force)
break;
}
}
if (ret < 0 && !force) {
for (u = counter; u != c; u = u->parent) {
spin_lock(&u->lock);
res_counter_uncharge_locked(u, val);
spin_unlock(&u->lock);
}
}
local_irq_restore(flags);
return ret;
}
int res_counter_charge(struct res_counter *counter, unsigned long val,
struct res_counter **limit_fail_at)
{
return __res_counter_charge(counter, val, limit_fail_at, false);
}
int res_counter_charge_nofail(struct res_counter *counter, unsigned long val,
struct res_counter **limit_fail_at)
{
return __res_counter_charge(counter, val, limit_fail_at, true);
}
void res_counter_uncharge_locked(struct res_counter *counter, unsigned long val)
{
if (WARN_ON(counter->usage < val))

16
kernel/sched/core.c
View File

@ -7985,13 +7985,9 @@ static struct cftype cpu_files[] = {
.write_u64 = cpu_rt_period_write_uint,
},
#endif
{ } /* terminate */
};
static int cpu_cgroup_populate(struct cgroup_subsys *ss, struct cgroup *cont)
{
return cgroup_add_files(cont, ss, cpu_files, ARRAY_SIZE(cpu_files));
}
struct cgroup_subsys cpu_cgroup_subsys = {
.name = "cpu",
.create = cpu_cgroup_create,
@ -7999,8 +7995,8 @@ struct cgroup_subsys cpu_cgroup_subsys = {
.can_attach = cpu_cgroup_can_attach,
.attach = cpu_cgroup_attach,
.exit = cpu_cgroup_exit,
.populate = cpu_cgroup_populate,
.subsys_id = cpu_cgroup_subsys_id,
.base_cftypes = cpu_files,
.early_init = 1,
};
@ -8185,13 +8181,9 @@ static struct cftype files[] = {
.name = "stat",
.read_map = cpuacct_stats_show,
},
{ } /* terminate */
};
static int cpuacct_populate(struct cgroup_subsys *ss, struct cgroup *cgrp)
{
return cgroup_add_files(cgrp, ss, files, ARRAY_SIZE(files));
}
/*
* charge this task's execution time to its accounting group.
*
@ -8223,7 +8215,7 @@ struct cgroup_subsys cpuacct_subsys = {
.name = "cpuacct",
.create = cpuacct_create,
.destroy = cpuacct_destroy,
.populate = cpuacct_populate,
.subsys_id = cpuacct_subsys_id,
.base_cftypes = files,
};
#endif /* CONFIG_CGROUP_CPUACCT */

115
mm/memcontrol.c
View File

@ -3873,14 +3873,21 @@ static inline u64 mem_cgroup_usage(struct mem_cgroup *memcg, bool swap)
return val << PAGE_SHIFT;
}
static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft)
static ssize_t mem_cgroup_read(struct cgroup *cont, struct cftype *cft,
struct file *file, char __user *buf,
size_t nbytes, loff_t *ppos)
{
struct mem_cgroup *memcg = mem_cgroup_from_cont(cont);
char str[64];
u64 val;
int type, name;
int type, name, len;
type = MEMFILE_TYPE(cft->private);
name = MEMFILE_ATTR(cft->private);
if (!do_swap_account && type == _MEMSWAP)
return -EOPNOTSUPP;
switch (type) {
case _MEM:
if (name == RES_USAGE)
@ -3897,7 +3904,9 @@ static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft)
default:
BUG();
}
return val;
len = scnprintf(str, sizeof(str), "%llu\n", (unsigned long long)val);
return simple_read_from_buffer(buf, nbytes, ppos, str, len);
}
/*
* The user of this function is...
@ -3913,6 +3922,10 @@ static int mem_cgroup_write(struct cgroup *cont, struct cftype *cft,
type = MEMFILE_TYPE(cft->private);
name = MEMFILE_ATTR(cft->private);
if (!do_swap_account && type == _MEMSWAP)
return -EOPNOTSUPP;
switch (name) {
case RES_LIMIT:
if (mem_cgroup_is_root(memcg)) { /* Can't set limit on root */
@ -3978,12 +3991,15 @@ out:
static int mem_cgroup_reset(struct cgroup *cont, unsigned int event)
{
struct mem_cgroup *memcg;
struct mem_cgroup *memcg = mem_cgroup_from_cont(cont);
int type, name;
memcg = mem_cgroup_from_cont(cont);
type = MEMFILE_TYPE(event);
name = MEMFILE_ATTR(event);
if (!do_swap_account && type == _MEMSWAP)
return -EOPNOTSUPP;
switch (name) {
case RES_MAX_USAGE:
if (type == _MEM)
@ -4624,29 +4640,22 @@ static int mem_control_numa_stat_open(struct inode *unused, struct file *file)
#endif /* CONFIG_NUMA */
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
static int register_kmem_files(struct cgroup *cont, struct cgroup_subsys *ss)
static int memcg_init_kmem(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
{
/*
* Part of this would be better living in a separate allocation
* function, leaving us with just the cgroup tree population work.
* We, however, depend on state such as network's proto_list that
* is only initialized after cgroup creation. I found the less
* cumbersome way to deal with it to defer it all to populate time
*/
return mem_cgroup_sockets_init(cont, ss);
return mem_cgroup_sockets_init(memcg, ss);
};
static void kmem_cgroup_destroy(struct cgroup *cont)
static void kmem_cgroup_destroy(struct mem_cgroup *memcg)
{
mem_cgroup_sockets_destroy(cont);
mem_cgroup_sockets_destroy(memcg);
}
#else
static int register_kmem_files(struct cgroup *cont, struct cgroup_subsys *ss)
static int memcg_init_kmem(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
{
return 0;
}
static void kmem_cgroup_destroy(struct cgroup *cont)
static void kmem_cgroup_destroy(struct mem_cgroup *memcg)
{
}
#endif
@ -4655,7 +4664,7 @@ static struct cftype mem_cgroup_files[] = {
{
.name = "usage_in_bytes",
.private = MEMFILE_PRIVATE(_MEM, RES_USAGE),
.read_u64 = mem_cgroup_read,
.read = mem_cgroup_read,
.register_event = mem_cgroup_usage_register_event,
.unregister_event = mem_cgroup_usage_unregister_event,
},
@ -4663,25 +4672,25 @@ static struct cftype mem_cgroup_files[] = {
.name = "max_usage_in_bytes",
.private = MEMFILE_PRIVATE(_MEM, RES_MAX_USAGE),
.trigger = mem_cgroup_reset,
.read_u64 = mem_cgroup_read,
.read = mem_cgroup_read,
},
{
.name = "limit_in_bytes",
.private = MEMFILE_PRIVATE(_MEM, RES_LIMIT),
.write_string = mem_cgroup_write,
.read_u64 = mem_cgroup_read,
.read = mem_cgroup_read,
},
{
.name = "soft_limit_in_bytes",
.private = MEMFILE_PRIVATE(_MEM, RES_SOFT_LIMIT),
.write_string = mem_cgroup_write,
.read_u64 = mem_cgroup_read,
.read = mem_cgroup_read,
},
{
.name = "failcnt",
.private = MEMFILE_PRIVATE(_MEM, RES_FAILCNT),
.trigger = mem_cgroup_reset,
.read_u64 = mem_cgroup_read,
.read = mem_cgroup_read,
},
{
.name = "stat",
@ -4721,14 +4730,11 @@ static struct cftype mem_cgroup_files[] = {
.mode = S_IRUGO,
},
#endif
};
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
static struct cftype memsw_cgroup_files[] = {
{
.name = "memsw.usage_in_bytes",
.private = MEMFILE_PRIVATE(_MEMSWAP, RES_USAGE),
.read_u64 = mem_cgroup_read,
.read = mem_cgroup_read,
.register_event = mem_cgroup_usage_register_event,
.unregister_event = mem_cgroup_usage_unregister_event,
},
@ -4736,35 +4742,23 @@ static struct cftype memsw_cgroup_files[] = {
.name = "memsw.max_usage_in_bytes",
.private = MEMFILE_PRIVATE(_MEMSWAP, RES_MAX_USAGE),
.trigger = mem_cgroup_reset,
.read_u64 = mem_cgroup_read,
.read = mem_cgroup_read,
},
{
.name = "memsw.limit_in_bytes",
.private = MEMFILE_PRIVATE(_MEMSWAP, RES_LIMIT),
.write_string = mem_cgroup_write,
.read_u64 = mem_cgroup_read,
.read = mem_cgroup_read,
},
{
.name = "memsw.failcnt",
.private = MEMFILE_PRIVATE(_MEMSWAP, RES_FAILCNT),
.trigger = mem_cgroup_reset,
.read_u64 = mem_cgroup_read,
.read = mem_cgroup_read,
},
};
static int register_memsw_files(struct cgroup *cont, struct cgroup_subsys *ss)
{
if (!do_swap_account)
return 0;
return cgroup_add_files(cont, ss, memsw_cgroup_files,
ARRAY_SIZE(memsw_cgroup_files));
};
#else
static int register_memsw_files(struct cgroup *cont, struct cgroup_subsys *ss)
{
return 0;
}
#endif
{ }, /* terminate */
};
static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *memcg, int node)
{
@ -5016,6 +5010,17 @@ mem_cgroup_create(struct cgroup *cont)
memcg->move_charge_at_immigrate = 0;
mutex_init(&memcg->thresholds_lock);
spin_lock_init(&memcg->move_lock);
error = memcg_init_kmem(memcg, &mem_cgroup_subsys);
if (error) {
/*
* We call put now because our (and parent's) refcnts
* are already in place. mem_cgroup_put() will internally
* call __mem_cgroup_free, so return directly
*/
mem_cgroup_put(memcg);
return ERR_PTR(error);
}
return &memcg->css;
free_out:
__mem_cgroup_free(memcg);
@ -5033,28 +5038,11 @@ static void mem_cgroup_destroy(struct cgroup *cont)
{
struct mem_cgroup *memcg = mem_cgroup_from_cont(cont);
kmem_cgroup_destroy(cont);
kmem_cgroup_destroy(memcg);
mem_cgroup_put(memcg);
}
static int mem_cgroup_populate(struct cgroup_subsys *ss,
struct cgroup *cont)
{
int ret;
ret = cgroup_add_files(cont, ss, mem_cgroup_files,
ARRAY_SIZE(mem_cgroup_files));
if (!ret)
ret = register_memsw_files(cont, ss);
if (!ret)
ret = register_kmem_files(cont, ss);
return ret;
}
#ifdef CONFIG_MMU
/* Handlers for move charge at task migration. */
#define PRECHARGE_COUNT_AT_ONCE 256
@ -5638,12 +5626,13 @@ struct cgroup_subsys mem_cgroup_subsys = {
.create = mem_cgroup_create,
.pre_destroy = mem_cgroup_pre_destroy,
.destroy = mem_cgroup_destroy,
.populate = mem_cgroup_populate,
.can_attach = mem_cgroup_can_attach,
.cancel_attach = mem_cgroup_cancel_attach,
.attach = mem_cgroup_move_task,
.base_cftypes = mem_cgroup_files,
.early_init = 0,
.use_id = 1,
.__DEPRECATED_clear_css_refs = true,
};
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP

30
net/core/netprio_cgroup.c
View File

@ -25,21 +25,6 @@
#include <net/sock.h>
#include <net/netprio_cgroup.h>
static struct cgroup_subsys_state *cgrp_create(struct cgroup *cgrp);
static void cgrp_destroy(struct cgroup *cgrp);
static int cgrp_populate(struct cgroup_subsys *ss, struct cgroup *cgrp);
struct cgroup_subsys net_prio_subsys = {
.name = "net_prio",
.create = cgrp_create,
.destroy = cgrp_destroy,
.populate = cgrp_populate,
#ifdef CONFIG_NETPRIO_CGROUP
.subsys_id = net_prio_subsys_id,
#endif
.module = THIS_MODULE
};
#define PRIOIDX_SZ 128
static unsigned long prioidx_map[PRIOIDX_SZ];
@ -259,12 +244,19 @@ static struct cftype ss_files[] = {
.read_map = read_priomap,
.write_string = write_priomap,
},
{ } /* terminate */
};
static int cgrp_populate(struct cgroup_subsys *ss, struct cgroup *cgrp)
{
return cgroup_add_files(cgrp, ss, ss_files, ARRAY_SIZE(ss_files));
}
struct cgroup_subsys net_prio_subsys = {
.name = "net_prio",
.create = cgrp_create,
.destroy = cgrp_destroy,
#ifdef CONFIG_NETPRIO_CGROUP
.subsys_id = net_prio_subsys_id,
#endif
.base_cftypes = ss_files,
.module = THIS_MODULE
};
static int netprio_device_event(struct notifier_block *unused,
unsigned long event, void *ptr)

10
net/core/sock.c
View File

@ -143,7 +143,7 @@ static DEFINE_MUTEX(proto_list_mutex);
static LIST_HEAD(proto_list);
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
int mem_cgroup_sockets_init(struct cgroup *cgrp, struct cgroup_subsys *ss)
int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
{
struct proto *proto;
int ret = 0;
@ -151,7 +151,7 @@ int mem_cgroup_sockets_init(struct cgroup *cgrp, struct cgroup_subsys *ss)
mutex_lock(&proto_list_mutex);
list_for_each_entry(proto, &proto_list, node) {
if (proto->init_cgroup) {
ret = proto->init_cgroup(cgrp, ss);
ret = proto->init_cgroup(memcg, ss);
if (ret)
goto out;
}
@ -162,19 +162,19 @@ int mem_cgroup_sockets_init(struct cgroup *cgrp, struct cgroup_subsys *ss)
out:
list_for_each_entry_continue_reverse(proto, &proto_list, node)
if (proto->destroy_cgroup)
proto->destroy_cgroup(cgrp);
proto->destroy_cgroup(memcg);
mutex_unlock(&proto_list_mutex);
return ret;
}
void mem_cgroup_sockets_destroy(struct cgroup *cgrp)
void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg)
{
struct proto *proto;
mutex_lock(&proto_list_mutex);
list_for_each_entry_reverse(proto, &proto_list, node)
if (proto->destroy_cgroup)
proto->destroy_cgroup(cgrp);
proto->destroy_cgroup(memcg);
mutex_unlock(&proto_list_mutex);
}
#endif

77
net/ipv4/tcp_memcontrol.c
View File

@ -6,37 +6,6 @@
#include <linux/memcontrol.h>
#include <linux/module.h>
static u64 tcp_cgroup_read(struct cgroup *cont, struct cftype *cft);
static int tcp_cgroup_write(struct cgroup *cont, struct cftype *cft,
const char *buffer);
static int tcp_cgroup_reset(struct cgroup *cont, unsigned int event);
static struct cftype tcp_files[] = {
{
.name = "kmem.tcp.limit_in_bytes",
.write_string = tcp_cgroup_write,
.read_u64 = tcp_cgroup_read,
.private = RES_LIMIT,
},
{
.name = "kmem.tcp.usage_in_bytes",
.read_u64 = tcp_cgroup_read,
.private = RES_USAGE,
},
{
.name = "kmem.tcp.failcnt",
.private = RES_FAILCNT,
.trigger = tcp_cgroup_reset,
.read_u64 = tcp_cgroup_read,
},
{
.name = "kmem.tcp.max_usage_in_bytes",
.private = RES_MAX_USAGE,
.trigger = tcp_cgroup_reset,
.read_u64 = tcp_cgroup_read,
},
};
static inline struct tcp_memcontrol *tcp_from_cgproto(struct cg_proto *cg_proto)
{
return container_of(cg_proto, struct tcp_memcontrol, cg_proto);
@ -49,7 +18,7 @@ static void memcg_tcp_enter_memory_pressure(struct sock *sk)
}
EXPORT_SYMBOL(memcg_tcp_enter_memory_pressure);
int tcp_init_cgroup(struct cgroup *cgrp, struct cgroup_subsys *ss)
int tcp_init_cgroup(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
{
/*
* The root cgroup does not use res_counters, but rather,
@ -59,13 +28,12 @@ int tcp_init_cgroup(struct cgroup *cgrp, struct cgroup_subsys *ss)
struct res_counter *res_parent = NULL;
struct cg_proto *cg_proto, *parent_cg;
struct tcp_memcontrol *tcp;
struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
struct mem_cgroup *parent = parent_mem_cgroup(memcg);
struct net *net = current->nsproxy->net_ns;
cg_proto = tcp_prot.proto_cgroup(memcg);
if (!cg_proto)
goto create_files;
return 0;
tcp = tcp_from_cgproto(cg_proto);
@ -88,15 +56,12 @@ int tcp_init_cgroup(struct cgroup *cgrp, struct cgroup_subsys *ss)
cg_proto->sockets_allocated = &tcp->tcp_sockets_allocated;
cg_proto->memcg = memcg;
create_files:
return cgroup_add_files(cgrp, ss, tcp_files,
ARRAY_SIZE(tcp_files));
return 0;
}
EXPORT_SYMBOL(tcp_init_cgroup);
void tcp_destroy_cgroup(struct cgroup *cgrp)
void tcp_destroy_cgroup(struct mem_cgroup *memcg)
{
struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
struct cg_proto *cg_proto;
struct tcp_memcontrol *tcp;
u64 val;
@ -270,3 +235,37 @@ void tcp_prot_mem(struct mem_cgroup *memcg, long val, int idx)
tcp->tcp_prot_mem[idx] = val;
}
static struct cftype tcp_files[] = {
{
.name = "kmem.tcp.limit_in_bytes",
.write_string = tcp_cgroup_write,
.read_u64 = tcp_cgroup_read,
.private = RES_LIMIT,
},
{
.name = "kmem.tcp.usage_in_bytes",
.read_u64 = tcp_cgroup_read,
.private = RES_USAGE,
},
{
.name = "kmem.tcp.failcnt",
.private = RES_FAILCNT,
.trigger = tcp_cgroup_reset,
.read_u64 = tcp_cgroup_read,
},
{
.name = "kmem.tcp.max_usage_in_bytes",
.private = RES_MAX_USAGE,
.trigger = tcp_cgroup_reset,
.read_u64 = tcp_cgroup_read,
},
{ } /* terminate */
};
static int __init tcp_memcontrol_init(void)
{
WARN_ON(cgroup_add_cftypes(&mem_cgroup_subsys, tcp_files));
return 0;
}
__initcall(tcp_memcontrol_init);

31
net/sched/cls_cgroup.c
View File

@ -22,22 +22,6 @@
#include <net/sock.h>
#include <net/cls_cgroup.h>
static struct cgroup_subsys_state *cgrp_create(struct cgroup *cgrp);
static void cgrp_destroy(struct cgroup *cgrp);
static int cgrp_populate(struct cgroup_subsys *ss, struct cgroup *cgrp);
struct cgroup_subsys net_cls_subsys = {
.name = "net_cls",
.create = cgrp_create,
.destroy = cgrp_destroy,
.populate = cgrp_populate,
#ifdef CONFIG_NET_CLS_CGROUP
.subsys_id = net_cls_subsys_id,
#endif
.module = THIS_MODULE,
};
static inline struct cgroup_cls_state *cgrp_cls_state(struct cgroup *cgrp)
{
return container_of(cgroup_subsys_state(cgrp, net_cls_subsys_id),
@ -86,12 +70,19 @@ static struct cftype ss_files[] = {
.read_u64 = read_classid,
.write_u64 = write_classid,
},
{ } /* terminate */
};
static int cgrp_populate(struct cgroup_subsys *ss, struct cgroup *cgrp)
{
return cgroup_add_files(cgrp, ss, ss_files, ARRAY_SIZE(ss_files));
}
struct cgroup_subsys net_cls_subsys = {
.name = "net_cls",
.create = cgrp_create,
.destroy = cgrp_destroy,
#ifdef CONFIG_NET_CLS_CGROUP
.subsys_id = net_cls_subsys_id,
#endif
.base_cftypes = ss_files,
.module = THIS_MODULE,
};
struct cls_cgroup_head {
u32 handle;

10
security/device_cgroup.c
View File

@ -447,22 +447,16 @@ static struct cftype dev_cgroup_files[] = {
.read_seq_string = devcgroup_seq_read,
.private = DEVCG_LIST,
},
{ } /* terminate */
};
static int devcgroup_populate(struct cgroup_subsys *ss,
struct cgroup *cgroup)
{
return cgroup_add_files(cgroup, ss, dev_cgroup_files,
ARRAY_SIZE(dev_cgroup_files));
}
struct cgroup_subsys devices_subsys = {
.name = "devices",
.can_attach = devcgroup_can_attach,
.create = devcgroup_create,
.destroy = devcgroup_destroy,
.populate = devcgroup_populate,
.subsys_id = devices_subsys_id,
.base_cftypes = dev_cgroup_files,
};
int __devcgroup_inode_permission(struct inode *inode, int mask)