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158e0a2d1b
When the OOM killer scans task, it check a task is under memcg or not when it's called via memcg's context. But, as Oleg pointed out, a thread group leader may have NULL ->mm and task_in_mem_cgroup() may do wrong decision. We have to use find_lock_task_mm() in memcg as generic OOM-Killer does. Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Cc: Balbir Singh <balbir@linux.vnet.ibm.com> Reviewed-by: Minchan Kim <minchan.kim@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
76 lines
1.9 KiB
C
76 lines
1.9 KiB
C
#ifndef __INCLUDE_LINUX_OOM_H
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#define __INCLUDE_LINUX_OOM_H
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/*
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* /proc/<pid>/oom_adj is deprecated, see
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* Documentation/feature-removal-schedule.txt.
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*
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* /proc/<pid>/oom_adj set to -17 protects from the oom-killer
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*/
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#define OOM_DISABLE (-17)
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/* inclusive */
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#define OOM_ADJUST_MIN (-16)
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#define OOM_ADJUST_MAX 15
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/*
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* /proc/<pid>/oom_score_adj set to OOM_SCORE_ADJ_MIN disables oom killing for
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* pid.
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*/
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#define OOM_SCORE_ADJ_MIN (-1000)
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#define OOM_SCORE_ADJ_MAX 1000
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#ifdef __KERNEL__
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#include <linux/sched.h>
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#include <linux/types.h>
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#include <linux/nodemask.h>
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struct zonelist;
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struct notifier_block;
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struct mem_cgroup;
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struct task_struct;
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/*
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* Types of limitations to the nodes from which allocations may occur
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*/
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enum oom_constraint {
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CONSTRAINT_NONE,
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CONSTRAINT_CPUSET,
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CONSTRAINT_MEMORY_POLICY,
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CONSTRAINT_MEMCG,
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};
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extern unsigned int oom_badness(struct task_struct *p, struct mem_cgroup *mem,
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const nodemask_t *nodemask, unsigned long totalpages);
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extern int try_set_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
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extern void clear_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
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extern void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
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int order, nodemask_t *mask);
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extern int register_oom_notifier(struct notifier_block *nb);
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extern int unregister_oom_notifier(struct notifier_block *nb);
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extern bool oom_killer_disabled;
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static inline void oom_killer_disable(void)
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{
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oom_killer_disabled = true;
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}
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static inline void oom_killer_enable(void)
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{
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oom_killer_disabled = false;
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}
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/* The badness from the OOM killer */
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extern unsigned long badness(struct task_struct *p, struct mem_cgroup *mem,
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const nodemask_t *nodemask, unsigned long uptime);
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extern struct task_struct *find_lock_task_mm(struct task_struct *p);
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/* sysctls */
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extern int sysctl_oom_dump_tasks;
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extern int sysctl_oom_kill_allocating_task;
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extern int sysctl_panic_on_oom;
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#endif /* __KERNEL__*/
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#endif /* _INCLUDE_LINUX_OOM_H */
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