blob: 69864a547663ecda818ac17c171ed085dbe33c26 [file] [log] [blame]
/* SPDX-License-Identifier: GPL-2.0 */
#include <linux/sched/signal.h>
#include <linux/types.h>
#include <linux/nodemask.h>
#include <uapi/linux/oom.h>
#include <linux/sched/coredump.h> /* MMF_* */
#include <linux/mm.h> /* VM_FAULT* */
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;
/* Memory cgroup in which oom is invoked, or NULL for global oom */
struct mem_cgroup *memcg;
/* 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;
/* Used by oom implementation, do not set */
unsigned long totalpages;
struct task_struct *chosen;
unsigned long chosen_points;
extern struct mutex oom_lock;
static inline void set_current_oom_origin(void)
current->signal->oom_flag_origin = true;
static inline void clear_current_oom_origin(void)
current->signal->oom_flag_origin = false;
static inline bool oom_task_origin(const struct task_struct *p)
return p->signal->oom_flag_origin;
static inline bool tsk_is_oom_victim(struct task_struct * tsk)
return tsk->signal->oom_mm;
* Use this helper if tsk->mm != mm and the victim mm needs a special
* handling. This is guaranteed to stay true after once set.
static inline bool mm_is_oom_victim(struct mm_struct *mm)
return test_bit(MMF_OOM_VICTIM, &mm->flags);
* Checks whether a page fault on the given mm is still reliable.
* This is no longer true if the oom reaper started to reap the
* address space which is reflected by MMF_UNSTABLE flag set in
* the mm. At that moment any !shared mapping would lose the content
* and could cause a memory corruption (zero pages instead of the
* original content).
* User should call this before establishing a page table entry for
* a !shared mapping and under the proper page table lock.
* Return 0 when the PF is safe VM_FAULT_SIGBUS otherwise.
static inline vm_fault_t check_stable_address_space(struct mm_struct *mm)
if (unlikely(test_bit(MMF_UNSTABLE, &mm->flags)))
return 0;
bool __oom_reap_task_mm(struct mm_struct *mm);
extern unsigned long oom_badness(struct task_struct *p,
struct mem_cgroup *memcg, const nodemask_t *nodemask,
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_disable(signed long timeout);
extern void oom_killer_enable(void);
extern struct task_struct *find_lock_task_mm(struct task_struct *p);
/* 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 */