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cgroup: Add mount flag to enable cpuset to use v2 behavior in v1 cgroup

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A new mount option "cpuset_v2_mode" is added to the v1 cgroupfs
filesystem to enable cpuset controller to use v2 behavior in a v1
cgroup. This mount option applies only to cpuset controller and have
no effect on other controllers.

Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Waiman Long 2017-08-17 15:33:09 -04:00 • committed by Tejun Heo
parent 696b98f244
commit e1cba4b85d
2 changed files with 11 additions and 0 deletions
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5
include/linux/cgroup-defs.h
View file

@ -74,6 +74,11 @@ enum {
* aren't writeable from inside the namespace. * aren't writeable from inside the namespace.
*/ */
CGRP_ROOT_NS_DELEGATE = (1 << 3), CGRP_ROOT_NS_DELEGATE = (1 << 3),
/*
* Enable cpuset controller in v1 cgroup to use v2 behavior.
*/
CGRP_ROOT_CPUSET_V2_MODE = (1 << 4),
}; };
/* cftype->flags */ /* cftype->flags */

6
kernel/cgroup/cgroup-v1.c
View file

@ -895,6 +895,8 @@ static int cgroup1_show_options(struct seq_file *seq, struct kernfs_root *kf_roo
seq_puts(seq, ",noprefix"); seq_puts(seq, ",noprefix");
if (root->flags & CGRP_ROOT_XATTR) if (root->flags & CGRP_ROOT_XATTR)
seq_puts(seq, ",xattr"); seq_puts(seq, ",xattr");
if (root->flags & CGRP_ROOT_CPUSET_V2_MODE)
seq_puts(seq, ",cpuset_v2_mode");
spin_lock(&release_agent_path_lock); spin_lock(&release_agent_path_lock);
if (strlen(root->release_agent_path)) if (strlen(root->release_agent_path))
@ -949,6 +951,10 @@ static int parse_cgroupfs_options(char *data, struct cgroup_sb_opts *opts)
opts->cpuset_clone_children = true; opts->cpuset_clone_children = true;
continue; continue;
} }
if (!strcmp(token, "cpuset_v2_mode")) {
opts->flags |= CGRP_ROOT_CPUSET_V2_MODE;
continue;
}
if (!strcmp(token, "xattr")) { if (!strcmp(token, "xattr")) {
opts->flags |= CGRP_ROOT_XATTR; opts->flags |= CGRP_ROOT_XATTR;
continue; continue;