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Commit e1cba4b8 authored by Waiman Long's avatar Waiman Long Committed by Tejun Heo
Browse files

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



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: default avatarWaiman Long <longman@redhat.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent 696b98f2

include/linux/cgroup-defs.h

+5 −0
Original line number Diff line number Diff line
@@ -74,6 +74,11 @@ enum { 
	 * aren't writeable from inside the namespace.

	 */

	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 */

kernel/cgroup/cgroup-v1.c

+6 −0
Original line number Diff line number Diff line
@@ -895,6 +895,8 @@ static int cgroup1_show_options(struct seq_file *seq, struct kernfs_root *kf_roo 
		seq_puts(seq, ",noprefix");

	if (root->flags & CGRP_ROOT_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);

	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;

			continue;

		}

		if (!strcmp(token, "cpuset_v2_mode")) {

			opts->flags |= CGRP_ROOT_CPUSET_V2_MODE;

			continue;

		}

		if (!strcmp(token, "xattr")) {

			opts->flags |= CGRP_ROOT_XATTR;

			continue;