Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/include/linux/cgroup-defs.h b/include/linux/cgroup-defs.h
index 22254c1..430e219 100644
--- a/include/linux/cgroup-defs.h
+++ b/include/linux/cgroup-defs.h
@@ -20,6 +20,7 @@
#include <linux/u64_stats_sync.h>
#include <linux/workqueue.h>
#include <linux/bpf-cgroup.h>
+#include <linux/psi_types.h>
#ifdef CONFIG_CGROUPS
@@ -31,6 +32,7 @@
struct kernfs_ops;
struct kernfs_open_file;
struct seq_file;
+struct poll_table_struct;
#define MAX_CGROUP_TYPE_NAMELEN 32
#define MAX_CGROUP_ROOT_NAMELEN 64
@@ -63,6 +65,12 @@
* specified at mount time and thus is implemented here.
*/
CGRP_CPUSET_CLONE_CHILDREN,
+
+ /* Control group has to be frozen. */
+ CGRP_FREEZE,
+
+ /* Cgroup is frozen. */
+ CGRP_FROZEN,
};
/* cgroup_root->flags */
@@ -81,6 +89,11 @@
* Enable cpuset controller in v1 cgroup to use v2 behavior.
*/
CGRP_ROOT_CPUSET_V2_MODE = (1 << 4),
+
+ /*
+ * Enable legacy local memory.events.
+ */
+ CGRP_ROOT_MEMORY_LOCAL_EVENTS = (1 << 5),
};
/* cftype->flags */
@@ -91,6 +104,7 @@
CFTYPE_NO_PREFIX = (1 << 3), /* (DON'T USE FOR NEW FILES) no subsys prefix */
CFTYPE_WORLD_WRITABLE = (1 << 4), /* (DON'T USE FOR NEW FILES) S_IWUGO */
+ CFTYPE_DEBUG = (1 << 5), /* create when cgroup_debug */
/* internal flags, do not use outside cgroup core proper */
__CFTYPE_ONLY_ON_DFL = (1 << 16), /* only on default hierarchy */
@@ -207,6 +221,7 @@
*/
struct list_head tasks;
struct list_head mg_tasks;
+ struct list_head dying_tasks;
/* all css_task_iters currently walking this cset */
struct list_head task_iters;
@@ -314,6 +329,25 @@
struct cgroup *updated_next; /* NULL iff not on the list */
};
+struct cgroup_freezer_state {
+ /* Should the cgroup and its descendants be frozen. */
+ bool freeze;
+
+ /* Should the cgroup actually be frozen? */
+ int e_freeze;
+
+ /* Fields below are protected by css_set_lock */
+
+ /* Number of frozen descendant cgroups */
+ int nr_frozen_descendants;
+
+ /*
+ * Number of tasks, which are counted as frozen:
+ * frozen, SIGSTOPped, and PTRACEd.
+ */
+ int nr_frozen_tasks;
+};
+
struct cgroup {
/* self css with NULL ->ss, points back to this cgroup */
struct cgroup_subsys_state self;
@@ -346,6 +380,11 @@
* Dying cgroups are cgroups which were deleted by a user,
* but are still existing because someone else is holding a reference.
* max_descendants is a maximum allowed number of descent cgroups.
+ *
+ * nr_descendants and nr_dying_descendants are protected
+ * by cgroup_mutex and css_set_lock. It's fine to read them holding
+ * any of cgroup_mutex and css_set_lock; for writing both locks
+ * should be held.
*/
int nr_descendants;
int nr_dying_descendants;
@@ -436,12 +475,18 @@
/* used to schedule release agent */
struct work_struct release_agent_work;
+ /* used to track pressure stalls */
+ struct psi_group psi;
+
/* used to store eBPF programs */
struct cgroup_bpf bpf;
/* If there is block congestion on this cgroup. */
atomic_t congestion_count;
+ /* Used to store internal freezer state */
+ struct cgroup_freezer_state freezer;
+
/* ids of the ancestors at each level including self */
int ancestor_ids[];
};
@@ -569,6 +614,9 @@
ssize_t (*write)(struct kernfs_open_file *of,
char *buf, size_t nbytes, loff_t off);
+ __poll_t (*poll)(struct kernfs_open_file *of,
+ struct poll_table_struct *pt);
+
#ifdef CONFIG_DEBUG_LOCK_ALLOC
struct lock_class_key lockdep_key;
#endif
@@ -576,7 +624,7 @@
/*
* Control Group subsystem type.
- * See Documentation/cgroup-v1/cgroups.txt for details
+ * See Documentation/admin-guide/cgroup-v1/cgroups.rst for details
*/
struct cgroup_subsys {
struct cgroup_subsys_state *(*css_alloc)(struct cgroup_subsys_state *parent_css);
@@ -597,7 +645,7 @@
void (*cancel_fork)(struct task_struct *task);
void (*fork)(struct task_struct *task);
void (*exit)(struct task_struct *task);
- void (*free)(struct task_struct *task);
+ void (*release)(struct task_struct *task);
void (*bind)(struct cgroup_subsys_state *root_css);
bool early_init:1;