If this is invalid we can skip the address * space check, thus avoiding the deadlock: */ if (unlikely(!down_read_trylock(&mm->mmap_sem))) { // 缺页发生在内核上下文,此情况发生缺页的地址只能位于用户态地址空间 if ((error_code & PF_USER) == 0 && !search_exception_tables(regs->ip...
Check RAM type and Speed Different types of RAM are available in the market in which DDR1, DDR2, DDR3, and DDR4. DDR, SDRAM, and DRAM were included. The speed of a RAM we take in terms of cycles means how much cycles are completed in one second. $sudodmidecode--typememory|less U...
int __init_memblock memblock_set_node(phys_addr_t base, phys_addr_t size, struct memblock_type *type, int nid) { #ifdef CONFIG_NEED_MULTIPLE_NODES int start_rgn, end_rgn; int i, ret; ret = memblock_isolate_range(type, base, size, &start_rgn, &end_rgn); if (ret) return ret;...
Check RAM DDR Type Look at the field titled Fundamental Memory type. It tells about the ram ddr type, which in this case is DDR4. Fundamental Memory type DDR4 SDRAM Check RAM Manufacturer To check the ram manufacturer details check the section titled "Manufacturer Data" in the decode-dimms...
第二、使用dmidecode查询内存(RAM)信息 dmidecode -t 16 首先,可以通过以下命令查询机器最大支持的内存总量 [root@mysql ~]#dmidecode -t 16 # dmidecode 2.12 SMBIOS 2.5 present. Handle 0x0036, DMI type 16, 15 bytes Physical Memory Array Location: System Board Or Motherboard Use: System Memory Error...
fsck: File System Checkfsck.FS_TYPE fsck -t FS_TYPE 注意:FS_TYPE 一定要与分区上已经文件类型相同dumpe2fs命令:查看文件系统信息范例[20:57:51 root@CentOS8 ~]#dumpe2fs -h /dev/sdb1 dumpe2fs 1.45.6 (20-Mar-2020) Filesystem volume name: <none> Last mounted on: <not available> File...
在具有大容量RAM的现代32位计算机中, CPU不能直接访问所有的物理地址, 因为线性地址空间太小, 内核不可能直接映射所有物理内存到线性地址空间, 我们会在后面典型架构(x86)上内存区域划分详细讲解x86_32上的内存区域划分 因此Linux内核对不同区域的内存需要采用不同的管理方式和映射方式, 因此内核将物理地址或者成用zon...
pr_warn("try to clear pte for ram above max_low_pfn: pfn: %lx pmd: %p pmd phys: %lx, but pmd is big page and is not using pte !\n", pfn, pmd, __pa(pmd)); BUG_ON(1); } pte = pte_offset_kernel(pmd, va); if (!pte_present(*pte)) ...
The first command isfree. This is the simplest command to check your physical memory. This command is mainly used for checking RAM andSWAPon the system. Using different switch you can change the byte-format of output. Like-bfor bytes,-kfor kilobytes,-mfor megabytes and-gfor gigabytes. ...
check NUMBER do a simple check on the file system cp [FROM-DEVICE] FROM-NUMBER TO-NUMBER copy file system to another partition help [COMMAND]printgeneral help,orhelp on COMMAND mklabel,mktable LABEL-TYPE create a new disklabel (partition table)#创建磁盘分区表mkfs NUMBER FS-TYPE make a FS...