From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Waiman Long Date: Thu, 17 Aug 2017 15:33:09 -0400 Subject: [PATCH] cgroup: Add mount flag to enable cpuset to use v2 behavior in v1 cgroup MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Tejun Heo (cherry-picked from e1cba4b85daa71b710384d451ff6238d5e4d1ff6) Signed-off-by: Fabian Grünbichler --- include/linux/cgroup-defs.h | 5 +++++ kernel/cgroup/cgroup-v1.c | 6 ++++++ 2 files changed, 11 insertions(+) diff --git a/include/linux/cgroup-defs.h b/include/linux/cgroup-defs.h index 09f4c7df1478..c344e77707a5 100644 --- a/include/linux/cgroup-defs.h +++ b/include/linux/cgroup-defs.h @@ -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 */ diff --git a/kernel/cgroup/cgroup-v1.c b/kernel/cgroup/cgroup-v1.c index 7bf4b1533f34..ce7426b875f5 100644 --- a/kernel/cgroup/cgroup-v1.c +++ b/kernel/cgroup/cgroup-v1.c @@ -846,6 +846,8 @@ 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)) @@ -900,6 +902,10 @@ 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; -- 2.14.2