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cgroup: s/CGRP_CLONE_CHILDREN/CGRP_CPUSET_CLONE_CHILDREN/ 

clone_children is only meaningful for cpuset and will stay that way.
Rename the flag to reflect that and update documentation.  Also, drop
clone_children() wrapper in cgroup.c.  The thin wrapper is used only a
few times and one of them will go away soon.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>
Acked-by: Li Zefan <lizefan@huawei.com>
Cc: Glauber Costa <glommer@parallels.com>
This commit is contained in:
Tejun Heo 2012-11-19 08:13:38 -08:00
parent 92fb97487a
commit 2260e7fc1f
3 changed files with 19 additions and 23 deletions
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8
Documentation/cgroups/cgroups.txt
View File

@ -299,11 +299,9 @@ a cgroup hierarchy's release_agent path is empty.
1.5 What does clone_children do ?
---------------------------------
If the clone_children flag is enabled (1) in a cgroup, then all
cgroups created beneath will call the post_clone callbacks for each
subsystem of the newly created cgroup. Usually when this callback is
implemented for a subsystem, it copies the values of the parent
subsystem, this is the case for the cpuset.
This flag only affects the cpuset controller. If the clone_children
flag is enabled (1) in a cgroup, a new cpuset cgroup will copy its
configuration from the parent during initialization.
1.6 How do I use cgroups ?
--------------------------

6
include/linux/cgroup.h
View File

@ -143,9 +143,11 @@ enum {
/* Control Group requires release notifications to userspace */
CGRP_NOTIFY_ON_RELEASE,
/*
* Clone cgroup values when creating a new child cgroup
* 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_CLONE_CHILDREN,
CGRP_CPUSET_CLONE_CHILDREN,
};
struct cgroup {

28
kernel/cgroup.c
View File

@ -296,11 +296,6 @@ static int notify_on_release(const struct cgroup *cgrp)
return test_bit(CGRP_NOTIFY_ON_RELEASE, &cgrp->flags);
}
static int clone_children(const struct cgroup *cgrp)
{
return test_bit(CGRP_CLONE_CHILDREN, &cgrp->flags);
}
/*
* for_each_subsys() allows you to iterate on each subsystem attached to
* an active hierarchy
@ -1101,7 +1096,7 @@ static int cgroup_show_options(struct seq_file *seq, struct dentry *dentry)
seq_puts(seq, ",xattr");
if (strlen(root->release_agent_path))
seq_printf(seq, ",release_agent=%s", root->release_agent_path);
if (clone_children(&root->top_cgroup))
if (test_bit(CGRP_CPUSET_CLONE_CHILDREN, &root->top_cgroup.flags))
seq_puts(seq, ",clone_children");
if (strlen(root->name))
seq_printf(seq, ",name=%s", root->name);
@ -1113,7 +1108,7 @@ struct cgroup_sb_opts {
unsigned long subsys_mask;
unsigned long flags;
char *release_agent;
bool clone_children;
bool cpuset_clone_children;
char *name;
/* User explicitly requested empty subsystem */
bool none;
@ -1164,7 +1159,7 @@ static int parse_cgroupfs_options(char *data, struct cgroup_sb_opts *opts)
continue;
}
if (!strcmp(token, "clone_children")) {
opts->clone_children = true;
opts->cpuset_clone_children = true;
continue;
}
if (!strcmp(token, "xattr")) {
@ -1474,8 +1469,8 @@ static struct cgroupfs_root *cgroup_root_from_opts(struct cgroup_sb_opts *opts)
strcpy(root->release_agent_path, opts->release_agent);
if (opts->name)
strcpy(root->name, opts->name);
if (opts->clone_children)
set_bit(CGRP_CLONE_CHILDREN, &root->top_cgroup.flags);
if (opts->cpuset_clone_children)
set_bit(CGRP_CPUSET_CLONE_CHILDREN, &root->top_cgroup.flags);
return root;
}
@ -3905,7 +3900,7 @@ fail:
static u64 cgroup_clone_children_read(struct cgroup *cgrp,
struct cftype *cft)
{
return clone_children(cgrp);
return test_bit(CGRP_CPUSET_CLONE_CHILDREN, &cgrp->flags);
}
static int cgroup_clone_children_write(struct cgroup *cgrp,
@ -3913,9 +3908,9 @@ static int cgroup_clone_children_write(struct cgroup *cgrp,
u64 val)
{
if (val)
set_bit(CGRP_CLONE_CHILDREN, &cgrp->flags);
set_bit(CGRP_CPUSET_CLONE_CHILDREN, &cgrp->flags);
else
clear_bit(CGRP_CLONE_CHILDREN, &cgrp->flags);
clear_bit(CGRP_CPUSET_CLONE_CHILDREN, &cgrp->flags);
return 0;
}
@ -4130,8 +4125,8 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry,
if (notify_on_release(parent))
set_bit(CGRP_NOTIFY_ON_RELEASE, &cgrp->flags);
if (clone_children(parent))
set_bit(CGRP_CLONE_CHILDREN, &cgrp->flags);
if (test_bit(CGRP_CPUSET_CLONE_CHILDREN, &parent->flags))
set_bit(CGRP_CPUSET_CLONE_CHILDREN, &cgrp->flags);
for_each_subsys(root, ss) {
struct cgroup_subsys_state *css;
@ -4148,7 +4143,8 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry,
goto err_free_all;
}
/* At error, ->css_free() callback has to free assigned ID. */
if (clone_children(parent) && ss->post_clone)
if (test_bit(CGRP_CPUSET_CLONE_CHILDREN, &parent->flags) &&
ss->post_clone)
ss->post_clone(cgrp);
if (ss->broken_hierarchy && !ss->warned_broken_hierarchy &&