diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/cgroup.c | 12 | ||||
| -rw-r--r-- | kernel/cgroup_freezer.c | 8 | ||||
| -rw-r--r-- | kernel/events/core.c | 7 |
3 files changed, 26 insertions, 1 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c index 485cc1487ea2..13774b3b39aa 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -4076,8 +4076,9 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry, set_bit(CGRP_CLONE_CHILDREN, &cgrp->flags); for_each_subsys(root, ss) { - struct cgroup_subsys_state *css = ss->create(cgrp); + struct cgroup_subsys_state *css; + css = ss->create(cgrp); if (IS_ERR(css)) { err = PTR_ERR(css); goto err_destroy; @@ -4091,6 +4092,15 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry, /* At error, ->destroy() callback has to free assigned ID. */ if (clone_children(parent) && ss->post_clone) ss->post_clone(cgrp); + + if (ss->broken_hierarchy && !ss->warned_broken_hierarchy && + parent->parent) { + pr_warning("cgroup: %s (%d) created nested cgroup for controller \"%s\" which has incomplete hierarchy support. Nested cgroups may change behavior in the future.\n", + current->comm, current->pid, ss->name); + if (!strcmp(ss->name, "memory")) + pr_warning("cgroup: \"memory\" requires setting use_hierarchy to 1 on the root.\n"); + ss->warned_broken_hierarchy = true; + } } list_add(&cgrp->sibling, &cgrp->parent->children); diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c index 3649fc6b3eaa..b1724ce98981 100644 --- a/kernel/cgroup_freezer.c +++ b/kernel/cgroup_freezer.c @@ -373,4 +373,12 @@ struct cgroup_subsys freezer_subsys = { .can_attach = freezer_can_attach, .fork = freezer_fork, .base_cftypes = files, + + /* + * freezer subsys doesn't handle hierarchy at all. Frozen state + * should be inherited through the hierarchy - if a parent is + * frozen, all its children should be frozen. Fix it and remove + * the following. + */ + .broken_hierarchy = true, }; diff --git a/kernel/events/core.c b/kernel/events/core.c index 7b9df353ba1b..deec4e50eb30 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -7503,5 +7503,12 @@ struct cgroup_subsys perf_subsys = { .destroy = perf_cgroup_destroy, .exit = perf_cgroup_exit, .attach = perf_cgroup_attach, + + /* + * perf_event cgroup doesn't handle nesting correctly. + * ctx->nr_cgroups adjustments should be propagated through the + * cgroup hierarchy. Fix it and remove the following. + */ + .broken_hierarchy = true, }; #endif /* CONFIG_CGROUP_PERF */ |