1 files changed, 123 insertions, 0 deletions
diff --git a/include/linux/oom.h b/include/linux/oom.h
new file mode 100644
index 000000000000..0ba4a4c9dd47
--- /dev/null
+++ b/include/linux/oom.h
@@ -0,0 +1,123 @@
+#ifndef __INCLUDE_LINUX_OOM_H
+#define __INCLUDE_LINUX_OOM_H
+
+
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <linux/nodemask.h>
+#include <uapi/linux/oom.h>
+
+struct zonelist;
+struct notifier_block;
+struct mem_cgroup;
+struct task_struct;
+
+/*
+ * Details of the page allocation that triggered the oom killer that are used to
+ * determine what should be killed.
+ */
+struct oom_control {
+	/* Used to determine cpuset */
+	struct zonelist *zonelist;
+
+	/* Used to determine mempolicy */
+	nodemask_t *nodemask;
+
+	/* Used to determine cpuset and node locality requirement */
+	const gfp_t gfp_mask;
+
+	/*
+	 * order == -1 means the oom kill is required by sysrq, otherwise only
+	 * for display purposes.
+	 */
+	const int order;
+};
+
+/*
+ * Types of limitations to the nodes from which allocations may occur
+ */
+enum oom_constraint {
+	CONSTRAINT_NONE,
+	CONSTRAINT_CPUSET,
+	CONSTRAINT_MEMORY_POLICY,
+	CONSTRAINT_MEMCG,
+};
+
+enum oom_scan_t {
+	OOM_SCAN_OK,		/* scan thread and find its badness */
+	OOM_SCAN_CONTINUE,	/* do not consider thread for oom kill */
+	OOM_SCAN_ABORT,		/* abort the iteration and return */
+	OOM_SCAN_SELECT,	/* always select this thread first */
+};
+
+/* Thread is the potential origin of an oom condition; kill first on oom */
+#define OOM_FLAG_ORIGIN		((__force oom_flags_t)0x1)
+
+extern struct mutex oom_lock;
+
+static inline void set_current_oom_origin(void)
+{
+	current->signal->oom_flags |= OOM_FLAG_ORIGIN;
+}
+
+static inline void clear_current_oom_origin(void)
+{
+	current->signal->oom_flags &= ~OOM_FLAG_ORIGIN;
+}
+
+static inline bool oom_task_origin(const struct task_struct *p)
+{
+	return !!(p->signal->oom_flags & OOM_FLAG_ORIGIN);
+}
+
+extern void mark_oom_victim(struct task_struct *tsk);
+
+extern unsigned long oom_badness(struct task_struct *p,
+		struct mem_cgroup *memcg, const nodemask_t *nodemask,
+		unsigned long totalpages);
+
+extern int oom_kills_count(void);
+extern void note_oom_kill(void);
+extern void oom_kill_process(struct oom_control *oc, struct task_struct *p,
+			     unsigned int points, unsigned long totalpages,
+			     struct mem_cgroup *memcg, const char *message);
+
+extern void check_panic_on_oom(struct oom_control *oc,
+			       enum oom_constraint constraint,
+			       struct mem_cgroup *memcg);
+
+extern enum oom_scan_t oom_scan_process_thread(struct oom_control *oc,
+		struct task_struct *task, unsigned long totalpages);
+
+extern bool out_of_memory(struct oom_control *oc);
+
+extern void exit_oom_victim(void);
+
+extern int register_oom_notifier(struct notifier_block *nb);
+extern int unregister_oom_notifier(struct notifier_block *nb);
+
+extern bool oom_killer_disabled;
+extern bool oom_killer_disable(void);
+extern void oom_killer_enable(void);
+
+extern struct task_struct *find_lock_task_mm(struct task_struct *p);
+
+static inline bool task_will_free_mem(struct task_struct *task)
+{
+	/*
+	 * A coredumping process may sleep for an extended period in exit_mm(),
+	 * so the oom killer cannot assume that the process will promptly exit
+	 * and release memory.
+	 */
+	return (task->flags & PF_EXITING) &&
+		!(task->signal->flags & SIGNAL_GROUP_COREDUMP);
+}
+
+extern void dump_tasks(struct mem_cgroup *memcg,
+		const nodemask_t *nodemask);
+
+/* sysctls */
+extern int sysctl_oom_dump_tasks;
+extern int sysctl_oom_kill_allocating_task;
+extern int sysctl_panic_on_oom;
+#endif /* _INCLUDE_LINUX_OOM_H */