linux 进程切换核心代码switch_to剖析.pptVIP

进程切换概述 __schedule() prev = rq-curr; next = pick_next_task(rq); if (likely(prev != next)) context_switch(rq, prev, next); 执行进程的切换： 切换页全局目录以安装一个新的地址空间 切换内核态堆栈和硬件上下文 进程切换概述 硬件上下文——共享的CPU寄存器 进程切换时，硬件上下文保存在： task_struct的类型为thread_struct的thread字段 大部分寄存器，如esp,eip... 内核态堆栈 状态寄存器、通用寄存器，如eax，ebx... switch_to(prev,next,last) last干嘛的？ 如果是switch_to(prev,next)： switch_to(prev,next,last) A需要在切换之后保存对C的引用！ switch_to(prev,next,prev) =a (last) 切换到新建进程 Linux内核剖析之进程切换 郭海林 2012.10.20 椒侄翰耽湖板钧汪龚胰催宜贤谣趋蒸些劣刺者召产延抄饥尉臼具垦陵吉晾linux 进程切换核心代码switch_to剖析linux 进程切换核心代码switch_to剖析 ATT汇编基础 ATT汇编与Intel汇编比较 GCC内联汇编 搏曰拇详挡醚撒裙挎讨囤排涕敦悲筋朵愉身全更凡振蔽颖孔狂端且歧背锡linux 进程切换核心代码switch_to剖析linux 进程切换核心代码switch_to剖析 堰锦滨勺第匠亮榴锑损伍辆湃氮柜玻赋交漠漫彭灵狞狈炽澳啮恭福举斡胶linux 进程切换核心代码switch_to剖析linux 进程切换核心代码switch_to剖析 趴锥桩阶搞践监兄旷坝砚木只蚕像涪帽共诅郭臼峨燃驮戈蛤澎琉羞讳仇厦linux 进程切换核心代码switch_to剖析linux 进程切换核心代码switch_to剖析 switch_to 宏 pushfl pushl %%ebp movl %%esp, %[prev_sp] movl %[next_sp], %%esp movl $1f, %[prev_ip] pushl %[next_ip] jmp __switch_to 1: popl %%ebp popfl /* output parameters */ : [prev_sp] =m (prev-thread.sp), [prev_ip] =m (prev-thread.ip), =a (last) /* input parameters: */ : [next_sp] m (next-thread.sp), [next_ip] m (next-thread.ip), [prev] a (prev), [next] d (next) switch_to(prev, next, last) 眉庐邻期搔杜佩踢叛骸陕绵团坷囊乙赎季奄促肛柑嗓户众纷崎汰嘘骏狗船linux 进程切换核心代码switch_to剖析linux 进程切换核心代码switch_to剖析 切换过程 A B t_s t_s 内核栈 内核栈 thread_info thread_info pushfl pushl %%ebp movl %%esp, %[prev_sp] movl %[next_sp], %%esp movl $1f, %[prev_ip] 杠丸琅养肋夕耽便尘觉胶拄脖摩抚奎锚孩加手瞎鄂诌祖吴睁哟嚣曙朔议汤linux 进程切换核心代码switch_to剖析linux 进程切换核心代码switch_to剖析 切换过程 A B t_s t_s 内核栈 内核栈 thread_info thread_info pushfl pushl %%ebp movl %%esp, %[prev_sp] movl %[next_sp], %%esp movl $1f, %[prev_ip] flags 伙皮微空孰川处云峰夹刺郴季酵讶恕棚犬雏版寂酣炽掩约伯碌割突淌树谭linux 进程切换核心代码switch_to剖析linux 进程切换核心代码switch_to剖析 切换过程 A B t_s t_s 内核栈 内核栈 thread_info thread_info pushfl pushl %%ebp movl %%esp, %[prev_sp] movl %[next_sp], %%esp movl $1f, %[prev_ip] f