read_profile

函数名称：This function accesses profiling information. The returned data is* binary: the sampling step and the actual contents of the profile* buffer. Use of the program readprofile is recommended in order to* get meaningful info out of these data.

函数原型：static ssize_t read_profile(struct file *file, char __user *buf, size_t count, loff_t *ppos)

返回类型：ssize_t

参数：

类型	参数	名称
struct file *	file
char __user *	buf
size_t	count
loff_t *	ppos

468

p等于ppos

471

sample_step等于1左移prof_shift位

473

profile_flip_buffers()

474

如果p大于等于prof_len加1的和乘sizeof(unsignedint)则返回:0

476

如果count大于prof_len加1的和乘sizeof(unsignedint)减p则count等于prof_len加1的和乘sizeof(unsignedint)减p

478

read等于0

480

当p小于sizeof(unsignedint)且count大于0循环

481

如果put_user - Write a simple value into user space( * ((char * )( & sample_step) + p), buf)则返回:负EFAULT

483

buf自加

483

p自加

483

count自减

483

read自加

485

pnt等于prof_buffer加p减sizeof(atomic_t)

486

如果copy_to_user(buf, (void * )pnt, count)则返回:负EFAULT

488

read加等于count

489

ppos加等于read

490

返回:read

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