out_of_memory

函数名称：_of_memory - kill the "best" process when we run out of memory*@oc: pointer to struct oom_control* If we run out of memory, we have the choice between either* killing a random task (bad), letting the system crash (worse)

函数原型：bool out_of_memory(struct oom_control *oc)

返回类型：bool

参数：

类型	参数	名称
struct oom_control *	oc

1045

freed等于0

1047

如果oom_killer_disabled则返回:false

1050

如果非is_memcg_oom(oc)则

1051

blocking_notifier_call_chain( & oom_notify_list, 0, & freed)

1052

如果freed大于0则返回:true

1062

如果Checks whether the given task is dying or exiting and likely to* release its address space. This means that all threads and processes* sharing the same mm have to be killed or exiting.* Caller has to make sure that task->mm is stable (hold task_lock or则

1063

mark_oom_victim - mark the given task as OOM victim*@tsk: task to mark* Has to be called with oom_lock held and never after* oom has been disabled already.* under task_lock or operate on the current).

1064

wake_oom_reaper(当前进程)

1065

返回:true

1075

如果Used to determine cpuset and node locality requirement 且非Used to determine cpuset and node locality requirement 按位与__GFP_FS的值且非is_memcg_oom(oc)则返回:true

1082

Used to print the constraint info. 等于Determine the type of allocation constraint.

1083

如果Used to print the constraint info. 不等于CONSTRAINT_MEMORY_POLICY则Used to determine mempolicy = NULL

1085

Determines whether the kernel must panic because of the panic_on_oom sysctl.

1087

如果非is_memcg_oom(oc)且sysctl_oom_kill_allocating_task且mm且非rn true if the task is not adequate as candidate victim task. 且m_cpuset_eligible() - check task eligiblity for kill*@start: task struct of which task to consider*@oc: pointer to struct oom_control* Task eligibility is determined by whether or not a candidate task, @tsk,* shares the same mempolicy nodes as current if 且oom_score_adj不等于/proc//oom_score_adj set to OOM_SCORE_ADJ_MIN disables oom killing for* pid.则

1091

get_task_struct(当前进程)

1092

chosen等于当前进程

1093

oom_kill_process(oc, "Out of memory (oom_kill_allocating_task)")

1094

返回:true

1097

Simple selection loop. We choose the process with the highest number of* 'points'. In case scan was aborted, oc->chosen is set to -1.

1099

如果非chosen则

1100

dump_header(oc, NULL)

1101

打印警告信息("Out of memory and no killable processes...\n")

1107

如果非rder == -1 means the oom kill is required by sysrq, otherwise only* for display purposes.且非is_memcg_oom(oc)则panic - halt the system*@fmt: The text string to print* Display a message, then perform cleanups.* This function never returns.

1110

如果(chosen && chosen != (void * ) - 1UL)则oom_kill_process(oc, !is_memcg_oom(oc) ? "Out of memory" : "Memory cgroup out of memory")

1113

返回:非非chosen

**调用者**
名称	描述
pagefault_out_of_memory	The pagefault handler calls here because it is out of memory, so kill a* memory-hogging task. If oom_lock is held by somebody else, a parallel oom* killing is already in progress so do nothing.
__alloc_pages_may_oom
mem_cgroup_out_of_memory

源代码转换工具开放的插件接口	X
支持：c/c++/esqlc/java Oracle/Informix/Mysql 插件可实现：逻辑报告代码生成和批量转换代码

函数逻辑报告