更新日志

8.29 完成夏令营的最后一次提交

9.15 准备进行perf的移植，确定计划，搭建框架，把之前完成的写到框架内

Linux中perf的基本功能介绍

根据perf list所获得的基本的perf_event：

• Hardware event
  • cpu cycle: cpu周期数
  • instructions: 机器指令数
  • cache references: 缓存命中次数
  • cache misses: 缓存失效次数
  • branch instructions: 分支预测成功次数
  • branch misses: 分支预测失效次数
• Software event
  • alignment faults: 内存对齐错误发生的次数
  • context switches: 上下文切换次数
  • cpu clock: cpu中的高精度计时器
  • cpu migrations: cpu迁移次数
  • task clock: cpu处理task所消耗的时间
  • page faults: 页错误的统计

rCore-Tutorial上的perf设计方案

所有需要探测的数据

• Cpu
  • cpu clock
  • task clock
  • cpu cycle
  • cpu utilization
  • contexts switches ToDo
• Task
  • name
  • pid / ppid
  • status
  • syscall runtimes
  • cpu time
• Hardware(from PMU) ToDo
  • branch instructions
  • branch misses
  • cache references
  • cache misses
  • instructions

数据结构

//cpu状态
struct CpuStat{
	inner: RefCell<CpuStatInner>;
}

struct CpuStatInner{
	cpu_clock: usize,
	task_clock: usize,
	cpu_cycle: usize,
	context_switches: usize,
	cache_references: usize,
	cache_misses: usize,
	branch_instructions: usize,
	branch_misses: usize,
	instructions: usize,
}

//task状态
pub struct TaskControlBlock {
    // immutable
    pub pid: PidHandle,
    pub kernel_stack: KernelStack,
    // mutable
    inner: Mutex<TaskControlBlockInner>,
    pub ppid: isize,
}

pub struct TaskControlBlockInner {
    pub trap_cx_ppn: PhysPageNum,
    pub base_size: usize,
    pub task_cx_ptr: usize,
    pub task_status: TaskStatus,
    pub name: String,
    pub memory_set: MemorySet,
    pub parent: Option<Weak<TaskControlBlock>>,
    pub children: Vec<Arc<TaskControlBlock>>,
    pub exit_code: i32,
    pub fd_table: Vec<Option<Arc<dyn File + Send + Sync>>>,
    pub start_time: usize,
    pub cpu_time: usize,
    pub syscall: Arc<Mutex<SyscallCount>>,
}
//SyscallCount
pub struct SyscallCount{
    pub syscall_dup: (usize, usize),
    pub syscall_open: (usize, usize),
    pub syscall_close: (usize, usize),
    pub syscall_pipe: (usize, usize),
    pub syscall_read: (usize, usize),
    pub syscall_write: (usize, usize),
    pub syscall_yield: (usize, usize),
    pub syscall_get_time: (usize, usize),
    pub syscall_getpid: (usize, usize),
    pub syscall_fork: (usize, usize),
    pub syscall_exec: (usize, usize),
    pub syscall_waitpid: (usize, usize),
}

提供的数据接口

//cpu数据获取
impl CpuStat{
    pub fn get_cpu_clock_info() -> usize；
    pub fn get_cpu_cycle_info() -> usize;
    pub fn get_cpu_clock_info() -> usize;
    pub fn get_task_clock_info() -> usize;
    pub fn get_context_switches_info() -> usize;
    pub fn get_cpu_info() -> CpuStatInner; 
    pub fn get_cache_reference_info() -> usize;
    pub fn get_cache_misses_info() -> usize;
    pub fn get_instructions_info() -> usize;
    pub fn get_branch_instructions_info() -> usize;
    pub fn get_branch_misses_info() -> usize;
    pub fn get_page_faults_info() -> usize;
    pub fn get_cpu_utlization_info() -> usize;    //返回百分数
}

//task数据获取
impl TaskControlBlock{
    pub fn get_task_name_info(pid: usize) -> usize;
    pub fn get_task_ppid_info(pid: usize) -> isize;
    pub fn get_current_task_pid_info(Self) -> usize;
    pub fn get_task_numbers_info() -> usize;
    pub fn get_syscall_runtime_info(pid: usize) -> SyscallCount;
    pub fn get_cpu_time_info(pid: usize) -> usize;
    pub fn get_task_info() -> usize;
}		

详细设计和核心算法设计方案

实现和关键代码

测试结果与分析