121 lines
3.2 KiB
C
121 lines
3.2 KiB
C
#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);
|
|
}
|
|
|
|
/* 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 */
|