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Most of the files have names that describe the information that they contain. In the next installment of this /proc filesystem series, I'll explain the information given in the files. Many of the regular text type files contain hardware and system information and you may cat them as you would any other text file. This file contains information about your CPU(s).
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Model name : Intel(R) Core(TM) i5-7360U CPU 2.30GHzįlags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx rdtscp lm constant_tsc rep_good nopl xtopology nonstop_tsc eagerfpu pni pclmulqdq monitor ssse3 cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx rdrand hypervisor lahf_lm abm 3dnowprefetch fsgsbase avx2 invpcid rdseed clflushopt md_clear flush_l1dĪddress sizes : 39 bits physical, 48 bits virtual They do contain information or else why would they be there?įor example, display the cpuinfo file to the screen and you'll see what I mean. However, these /proc files, like the /proc filesystem itself ( procfs), are virtual. Ordinarily, a zero-sized file means that it contains no content. You'll notice that a long listing ( ls -l /proc) reveals that the regular text files have a size of 0. To list or open those files, you have to be root. There are a few files in each directory that regular users can't read. Ls: cannot read symbolic link /proc/411/exe: Permission deniedĪrch_status fdinfo numa_maps smaps_rollup Ls: cannot read symbolic link /proc/411/root: Permission denied Ls: cannot read symbolic link /proc/411/cwd: Permission denied Below is a listing of the /proc/411 directory. Inside those process-numbered directories, there are more files that have to do with the processes themselves. For example, in the first column, there are processes with the numbers 1, 10, 1055, 1057, 1059, and so on. The numbered files are directories that correspond to process numbers or process IDs (PIDs). If you look at the files under /proc, you'll see a lot of them (150+), depending on how many processes you have running. Note: I'm accessing files and directories under /proc as a standard user and not as root unless otherwise noted. In this article, I'll take a deep dive into its contents and what value you, as a sysadmin, can glean from it. The /proc filesystem appears to always exist because it's built at boot time and is removed at shutdown, but it is actually a virtual filesystem that contains a lot of relevant information about your system and its running processes. Linux system administration skills assessment.A guide to installing applications on Linux.
#CAT PROC CPUINFO VIRTUAL ADDRESS DOWNLOAD#
Download RHEL 9 at no charge through the Red Hat Developer program.It's not a crazy idea to have a cpu cap field output from 'xm info', but we would need a feature request for that, since the lack of it isn't a bug. cpu model + bios revision, for guessing isn't sufficient), is to just reboot to BIOS or to a bare-metal kernel. I'm afraid the best we'll be able to do for the case that someone gets on a machine they are unfamiliar with, and needs to check capabilities that dmidecode doesn't report (and some heuristic, e.g. While it's true that vmx isn't there, I have these extra flags from dmidecode that we've lost from cpuinfo after masking out the features
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On my system dmidecode gives the same output for a bare-metal -164 kernel that it does for a xen -190 kernel. Version: Intel(R) Xeon(R) CPU E5520 2.27GHz Signature: Type 0, Family 6, Model 26, Stepping 5ĬMOV (Conditional move instruction supported)įXSR (Fast floating-point save and restore) There got be some reason why this vmx is missing. The report by dmidecode is consistent with /proc/cpuinfo. This still does not work even with dmidecode.