Why does Linux have a default stack size soft limit of 8 MB? The point is to protect the OS. Programs that have a legitimate reason to need more stack are rare. On the other hand, programmer mistakes are common, and sometimes said mistakes lead to code that gets stuck in an infinite ...
Why does Linux have a default stack size soft limit of 8 MB? The point is to protect the OS. Programs that have a legitimate reason to need more stack are rare. On the other hand, programmer mistakes are common, and sometimes said mistakes lead to code that gets stuck in an infinite ...
AI代码解释 staticstruct page*get_page_from_freelist(gfp_t gfp_mask,unsigned int order,int alloc_flags,conststruct alloc_context*ac){for_next_zone_zonelist_nodemask(zone,z,ac->zonelist,ac->high_zoneidx,ac->nodemask){if(!zone_watermark_fast(zone,order,mark,ac_classzone_idx(ac),alloc_fla...
*/ pgoff = addr >> PAGE_SHIFT; break; default: return -EINVAL; } } error = security_file_mmap(file, reqprot, prot, flags, addr, 0); if (error) return error; error = ima_file_mmap(file, prot); if (error) return error; //在检查过参数并设置好所有需要的标志之后,剩余的工作委托给...
MPOL_LOCAL（默认）与 MPOL_DEFAULT 相似，也是优先在本地节点分配，当分配失败时去其他节点分配内存。
v=4.7#L4551 #define ZONELIST_ORDER_DEFAULT 0 /* 智能选择Node或Zone方式 */ #define ZONELIST_ORDER_NODE 1 /* 对应Node方式 */ #define ZONELIST_ORDER_ZONE 2 /* 对应Zone方式 */ 注意 在非NUMA系统中(比如UMA), 由于只有一个内存结点, 因此ZONELIST_ORDER_ZONE和ZONELIST_ORDER_NODE选项会配置...
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 ...
user_mode(regs)) { kernelmode_fixup_or_oops(regs, error_code, address, 0, 0, ARCH_DEFAULT_PKEY); return; } if (fault & VM_FAULT_OOM) { /* Kernel mode? Handle exceptions or die: */ if (!user_mode(regs)) { kernelmode_fixup_or_oops(regs, error_code, address, SIGSEGV, SEGV...
默认的 Linux buffer size 的最大值是非常小的,tcp 的内存是基于系统的内存自动计算的,你能通过键入以下命令找到实际的值: $ cat /proc/sys/net/ipv4/tcp_mem 默认的和最大的接收数据包内存大小: $ cat /proc/sys/net/core/rmem_default $ cat /proc/sys/net/core/rmem_max ...
(file->f_mode & FMODE_WRITE))vm_flags &= ~(VM_MAYWRITE | VM_SHARED);/* fall through */case MAP_PRIVATE:if (!(file->f_mode & FMODE_READ))return -EACCES;break;default:return -EINVAL;}} else {vm_flags |= VM_SHARED | VM_MAYSHARE;switch (flags & MAP_TYPE) {default:return ...