| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef __INCLUDE_LINUX_OOM_H |
| #define __INCLUDE_LINUX_OOM_H |
| |
| |
| #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; |
| |
| enum oom_constraint { |
| CONSTRAINT_NONE, |
| CONSTRAINT_CPUSET, |
| CONSTRAINT_MEMORY_POLICY, |
| CONSTRAINT_MEMCG, |
| }; |
| |
| /* |
| * 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; |
| long chosen_points; |
| |
| /* Used to print the constraint info. */ |
| enum oom_constraint constraint; |
| }; |
| |
| extern struct mutex oom_lock; |
| extern struct mutex oom_adj_mutex; |
| |
| 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 VM_FAULT_SIGBUS; |
| return 0; |
| } |
| |
| bool __oom_reap_task_mm(struct mm_struct *mm); |
| |
| long oom_badness(struct task_struct *p, |
| 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 */ |