函数逻辑报告 |
Source Code:arch\x86\kernel\tsc.c |
Create Date:2022-07-27 08:46:05 |
| Last Modify:2020-03-12 14:18:49 | Copyright©Brick |
| 首页 | 函数Tree |
| 注解内核,赢得工具 | 下载SCCT | English |
函数名称：Accelerators for sched_clock()* convert from cycles(64bits) => nanoseconds (64bits)* basic equation:* ns = cycles / (freq / ns_per_sec)* ns = cycles * (ns_per_sec / freq)* ns = cycles * (10^9 / (cpu_khz * 10^3))* ns = cycles * (10^6 / cpu_khz)
函数原型：static __always_inline unsigned long long cycles_2_ns(unsigned long long cyc)
返回类型：unsigned long long
参数：
| 类型 | 参数 | 名称 |
|---|---|---|
| unsigned long long | cyc |
| 113 | cyc2ns_read_begin( & data) |
| 115 | ns等于cyc2ns_offset |
| 116 | ns加等于mul_u64_u32_shr(cyc, cyc2ns_mul, cyc2ns_shift) |
| 118 | cyc2ns_read_end() |
| 120 | 返回:ns |
| 名称 | 描述 |
|---|---|
| __set_cyc2ns_scale | |
| native_sched_clock | Scheduler clock - returns current time in nanosec units. |
| native_sched_clock_from_tsc | Generate a sched_clock if you already have a TSC value. |
| 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 |