mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 11:19:37 +00:00
![David Rientjes](/assets/img/avatar_default.png)
The oom killer chooses not to kill a thread if: - an eligible thread has already been oom killed and has yet to exit, and - an eligible thread is exiting but has yet to free all its memory and is not the thread attempting to currently allocate memory. SysRq+F manually invokes the global oom killer to kill a memory-hogging task. This is normally done as a last resort to free memory when no progress is being made or to test the oom killer itself. For both uses, we always want to kill a thread and never defer. This patch causes SysRq+F to always kill an eligible thread and can be used to force a kill even if another oom killed thread has failed to exit. Signed-off-by: David Rientjes <rientjes@google.com> Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Acked-by: Pekka Enberg <penberg@kernel.org> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
#ifndef __INCLUDE_LINUX_OOM_H
|
|
#define __INCLUDE_LINUX_OOM_H
|
|
|
|
/*
|
|
* /proc/<pid>/oom_adj is deprecated, see
|
|
* Documentation/feature-removal-schedule.txt.
|
|
*
|
|
* /proc/<pid>/oom_adj set to -17 protects from the oom-killer
|
|
*/
|
|
#define OOM_DISABLE (-17)
|
|
/* inclusive */
|
|
#define OOM_ADJUST_MIN (-16)
|
|
#define OOM_ADJUST_MAX 15
|
|
|
|
/*
|
|
* /proc/<pid>/oom_score_adj set to OOM_SCORE_ADJ_MIN disables oom killing for
|
|
* pid.
|
|
*/
|
|
#define OOM_SCORE_ADJ_MIN (-1000)
|
|
#define OOM_SCORE_ADJ_MAX 1000
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <linux/sched.h>
|
|
#include <linux/types.h>
|
|
#include <linux/nodemask.h>
|
|
|
|
struct zonelist;
|
|
struct notifier_block;
|
|
struct mem_cgroup;
|
|
struct task_struct;
|
|
|
|
/*
|
|
* Types of limitations to the nodes from which allocations may occur
|
|
*/
|
|
enum oom_constraint {
|
|
CONSTRAINT_NONE,
|
|
CONSTRAINT_CPUSET,
|
|
CONSTRAINT_MEMORY_POLICY,
|
|
CONSTRAINT_MEMCG,
|
|
};
|
|
|
|
extern void compare_swap_oom_score_adj(int old_val, int new_val);
|
|
extern int test_set_oom_score_adj(int new_val);
|
|
|
|
extern unsigned int oom_badness(struct task_struct *p, struct mem_cgroup *memcg,
|
|
const nodemask_t *nodemask, unsigned long totalpages);
|
|
extern int try_set_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
|
|
extern void clear_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
|
|
|
|
extern void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
|
|
int order, nodemask_t *mask, bool force_kill);
|
|
extern int register_oom_notifier(struct notifier_block *nb);
|
|
extern int unregister_oom_notifier(struct notifier_block *nb);
|
|
|
|
extern bool oom_killer_disabled;
|
|
|
|
static inline void oom_killer_disable(void)
|
|
{
|
|
oom_killer_disabled = true;
|
|
}
|
|
|
|
static inline void oom_killer_enable(void)
|
|
{
|
|
oom_killer_disabled = false;
|
|
}
|
|
|
|
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 /* __KERNEL__*/
|
|
#endif /* _INCLUDE_LINUX_OOM_H */
|