函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\memcontrol.c Create Date:2022-07-27 17:46:29
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：__mem_cgroup_usage_register_event

函数原型：static int __mem_cgroup_usage_register_event(struct mem_cgroup *memcg, struct eventfd_ctx *eventfd, const char *args, enum res_type type)

返回类型：int

参数：

类型参数名称
struct mem_cgroup *memcg
struct eventfd_ctx *eventfd
const char *args
enum res_typetype
3940  ret等于page_counter_memparse - memparse() for page counter limits*@buf: string to parse*@max: string meaning maximum possible value*@nr_pages: returns the result in number of pages* Returns -EINVAL, or 0 and @nr_pages on success. @nr_pages will be
3941  如果ret则返回:ret
3944  mutex_lock( & protect arrays of thresholds )
3946  如果type恒等于_MEM则
3947  thresholds等于 thresholds for memory usage. RCU-protected
3948  usage等于mem_cgroup_usage(memcg, false)
3949  否则如果type恒等于_MEMSWAP则
3950  thresholds等于 thresholds for mem+swap usage. RCU-protected
3951  usage等于mem_cgroup_usage(memcg, true)
3952  否则BUG()
3956  如果 Primary thresholds array 则__mem_cgroup_threshold(memcg, type == _MEMSWAP)
3959  size等于如果 Primary thresholds array 则Size of entries[] 加1否则1
3962  new等于kmalloc(struct_size() - Calculate size of structure with trailing array.*@p: Pointer to the structure.*@member: Name of the array member.*@n: Number of elements in the array.* Calculates size of memory needed for structure @p followed by an(new, entries, size), GFP_KERNEL)
3963  如果非new则
3964  ret等于负ENOMEM
3965  转到:unlock
3967  Size of entries[] 等于size
3970  如果 Primary thresholds array 则
3971  memcpy(Array of thresholds , Array of thresholds , (size - 1) * sizeof(structmem_cgroup_threshold))
3976  eventfd等于eventfd
3977  threshold等于threshold
3980  sort(Array of thresholds , size, sizeof(structmem_cgroup_threshold), compare_thresholds, NULL)
3984  An array index points to threshold just below or equal to usage. 等于负1
3985  以i小于size循环
3986  如果threshold小于等于usage则
3992  An array index points to threshold just below or equal to usage. 先自加
3993  否则退出
3998  释放内存
3999  * Spare threshold array. * This is needed to make mem_cgroup_unregister_event() "never fail". * It must be able to store at least primary->size - 1 entries.等于 Primary thresholds array
4001  cu_assign_pointer() - assign to RCU-protected pointer*@p: pointer to assign to*@v: value to assign (publish)* Assigns the specified value to the specified RCU-protected* pointer, ensuring that any concurrent RCU readers will see* any prior initialization( Primary thresholds array , new)
4004  Wait for a grace period to elapse. But it is illegal to invoke* synchronize_rcu() from within an RCU read-side critical section.* Therefore, any legal call to synchronize_rcu() is a quiescent
4006  unlock :
4007  mutex_unlock - release the mutex*@lock: the mutex to be released* Unlock a mutex that has been locked by this task previously.* This function must not be used in interrupt context. Unlocking* of a not locked mutex is not allowed.
4009  返回:ret
调用者
名称描述
mem_cgroup_usage_register_event
memsw_cgroup_usage_register_event