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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115/* 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/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;}
/* * 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(mm_flags_test(MMF_UNSTABLE, mm))) return VM_FAULT_SIGBUS; return 0;}
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);
#endif /* _INCLUDE_LINUX_OOM_H */