普通进程(Normal Process): 又称为分时进程,这类进程在Linux系统中遵循默认的分时调度策略,如CFS(Completely Fair Scheduler)。它们按照各自权重(nice值)和虚拟运行时间(vruntime)来获取CPU时间片。nice值可以在[-20, 19]范围内调整,数值越小,优先级越高,但总体来说,普通进程之间是公平共享CPU资源的。 实时进程(...
Segmentationfault.blow_stack()atsetrlimit.c:44blow_stack();(gdb)print(void*)$esp$1=(void*)0xffffffffff7ff000(gdb)print(void*)orig_stack_pointer$2=(void*)0xffffc800(gdb)print0xffffc800-0xff7ff000$3=8378368//CurrentProcessStackSizeis8M...
Program received signalSIGSEGV,Segmentation fault.blow_stack()at setrlimit.c:44blow_stack();(gdb)print(void*)$esp $1=(void*)0xffffffffff7ff000(gdb)print(void*)orig_stack_pointer $2=(void*)0xffffc800(gdb)print0xffffc800-0xff7ff000$3=8378368// Current Process Stack Size is 8M 上面对进...
... 省略 ...//为进程创建 task_struct 结构,用父进程的资源填充 task_struct 信息p =copy_process(clone_flags, stack_start, stack_size, child_tidptr, NULL, trace, tls, NUMA_NO_NODE); ... 省略 ... } 随后会在 copy_process 函数中创建 task_struct 结构,并拷贝父进程的相关资源到新进程的 ...
blow_stack () at setrlimit.c:4 4 blow_stack(); (gdb) print (void *)$esp $1 = (void *) 0xffffffffff7ff000 (gdb) print (void *)orig_stack_pointer $2 = (void *) 0xffffc800 (gdb) print 0xffffc800-0xff7ff000 $3 = 8378368 // Current Process Stack Size is 8M ...
unix/linux的进程创建和Windows有很大不一样,windows对线程和进程的实现非常标准,windows内核有明确的线程和进程的概念。在windows API中,可以使用明确的API: CreateProcess和CreateThread来创建进程和线程,并且有一系列的API来操纵它们,但对于Linux来说,线程并不是一个强制性明确的概念 ...
4blow_stack(); (gdb)print(void*)$esp $1=(void*)0xffffffffff7ff000 (gdb)print(void*)orig_stack_pointer $2=(void*)0xffffc800 (gdb)print0xffffc800-0xff7ff000 $3=8378368// Current Process Stack Size is 8M 1. 2. 3. 4.
3.3copy_process源码分析 复制 /* 代码目录:linux源码/kernel/Fork.c */ staticstruct task_struct *copyprocessunsigned long clone_flags, unsigned long stack_start, unsigned long stack_size, int __user *child_tidptr, struct pid *pid, int trace) { int retval; struct task_struct *p; /* CLONE...
sys_clone也因此增加了一个int参数来传入相应的点tls_val。sys_clone通过do_fork来调用copy_process完成进程的复制,它调用特定的copy_thread和copy_thread把相应的系统调用参数从pt_regs寄存器列表中提取出来,但是会导致意外的情况。 only one code path into copy_thread can pass the CLONE_SETTLS flag, and ...
在前边《5.1 内核如何划分用户态和内核态虚拟内存空间》小节中我们提到,内核在/arch/x86/include/asm/page_32_types.h文件中通过 TASK_SIZE 将进程虚拟内存空间和内核虚拟内存空间分割开来。 /* * User space process size: 3GB (default). */#defineTASK_SIZE__PAGE_OFFSET ...