VirtualTam's bookmarks

41. Vim configuration for Linux kernel development 2018-04-22

    tags: code, editor/vim, index, linux, linux/kernel, programming/c

    [ permalink ]

    • https://kernelnewbies.org/FAQ/CodeBrowsing
    • https://stackoverflow.com/questions/33676829/vim-configuration-for-linux-kernel-development
    • https://stackoverflow.com/questions/3828157/how-to-use-cscope
    • https://stackoverflow.com/questions/934233/cscope-or-ctags-why-choose-one-over-the-other
    • https://github.com/vivien/vim-linux-coding-style
    • https://github.com/Valloric/YouCompleteMe
    • https://valloric.github.io/YouCompleteMe/
    • http://vim.wikia.com/wiki/Cscope
    • http://cscope.sourceforge.net/cscope_vim_tutorial.html
    • https://www.embeddedarm.com/blog/tag-jumping-in-a-codebase-using-ctags-and-cscope-in-vim/
42. Centos/RHEL 7 - Fix LVM boot issues after migration from ESXi to VirtualBox 2018-04-20

    tags: boot, bootloader/grub, filesystem, filesystem/lvm, fstab, linux, linux/centos, linux/kernel, linux/red-hat

    [ permalink ]

    Here are the steps I used to migrate a CentOS 7 VM from (presumably?) an ESXi server, to a local VirtualBox environment.

    The LVM volumes were not detected at boot, and after the boot timeout, the OS fell back to the Dracut emergency shell.

    • get a CentOS minimal installation CD
    • check the VM's resources and peripherals:
      • ensure there are no floppy drives (!)
      • setup CPU and RAM resources
      • check virtual drives
      • add an SCSI optical drive if needed
    • optional: convert the virtual drive images from VMDK to VDI
    • mount the CentOS installation disc
    • boot on the installation disc:
      • select "Troubleshooting", then "Rescue"
      • let the rescue utility detect filesystems and mountpoints
    • $ chroot to the detected environment
    • backup files:
      • /etc/fstab
      • /boot/grub/grub.cfg
    • under /boot, backup the initrd and initramfs for the current configuration (these will be overwritten)
    • compare the current /etc/fstab with the output of $ lsblk and $ blkid
    • if needed, manually edit /etc/fstab to use the appropriate block device UUIDs, identifiers and mountpoints
    • regenerate GRUB configuration:
      • $ grub2-mkconfig -o /boot/grub2/grub.cfg
    • if needed, reinstall GRUB:
      • $ grub-install /dev/sda
    • rebuild initrd:
      • $ mkinitrd --force /boot/<initrd_image> <kernel_version>
    • rebuild initramfs:
      • $ dracut --force <kernel_version>
    • exit the chroot
    • unmount the installation disc
    • reboot
    • optional but highly recommended: cross your fingers
    • ...
    • profit!
43. Dracut emergency shell 2018-04-20

    tags: filesystem, filesystem/lvm, linux, linux/kernel

    [ permalink ]

    • https://superuser.com/questions/1244536/dracut-emerg-shell-mount-lvm2-volume
    • https://unix.stackexchange.com/questions/207593/how-to-make-lvms-at-available-boot-kernel-panic-dracut-cannot-find-logical-vo
    • https://serverfault.com/questions/893721/centos7-dracut-lvm-command-not-found
    • https://www.novell.com/coolsolutions/appnote/19386.html
    • https://fedoraproject.org/wiki/How_to_debug_Dracut_problems
    • https://kb.vmware.com/s/article/1002402
    • https://forums.fedoraforum.org/showthread.php?294909-Need-dracut-emergency-shell-help-regenerate
44. LVM2 Resource Page 2018-04-20

    tags: filesystem, filesystem/lvm, linux, linux/kernel

    [ permalink ]

    • https://www.sourceware.org/dm/
    • http://www.tldp.org/HOWTO/LVM-HOWTO/index.html
    • https://wiki.archlinux.org/index.php/LVM
    • https://wiki.gentoo.org/wiki/LVM
    • https://en.wikipedia.org/wiki/Logical_Volume_Manager_%28Linux%29
45. dracut(8) - Linux man page 2018-04-20

    tags: filesystem, filesystem/lvm, linux, linux/kernel

    [ permalink ]

    • https://people.redhat.com/harald/dracut.html
    • https://wiki.gentoo.org/wiki/Dracut
    • https://fedoraproject.org/wiki/How_to_debug_Dracut_problems
46. TCP Tracepoints | Brendan Gregg 2018-04-10

    tags: bcc, linux, linux/kernel, network, observability/tracing

    [ permalink ]

    • https://lkml.org/lkml/2017/12/6/494
    • https://github.com/iovisor/bcc/pull/1639
    • http://www.brendangregg.com/DTrace/DTrace_Network_Providers.html
47. Linux - Network over USB (usbnet) 2018-04-03

    tags: ethernet, linux, microsoft/windows, network, raspberry-pi, usb

    [ permalink ]

    • http://www.linux-usb.org/usbnet/

    • http://www.davehylands.com/linux/gumstix/usbnet/

    • https://en.wikipedia.org/wiki/Ethernet_over_USB

    • https://superuser.com/questions/145933/how-to-add-usbnet-driver-to-the-linux-kernel#145944

    • https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/net/usb/usbnet.c

    • https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/net/usb/cdc_ether.c

    • https://www.systutorials.com/linux-kernels/tag/cdc_ether/

    • https://raspberrypi.stackexchange.com/questions/9636/usb-to-usb-mimicking-ethernet

    • https://www.raspberrypi.org/forums/viewtopic.php?f=36&t=131042

    • https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=130810

    • https://www.raspberrypi.org/forums/viewtopic.php?p=865905#p865905

    • https://raspberrypi.stackexchange.com/questions/13917/raspberry-pi-communication-over-usb

    • http://wiki.openmoko.org/wiki/USB_Networking

    • http://www.webos-internals.org/wiki/USBnet_Setup

    • https://developer.ridgerun.com/wiki/index.php/How_to_use_USB_device_networking

    • http://www.ev3dev.org/docs/tutorials/connecting-to-the-internet-via-usb/

48. LWN - Berkeley Packet Filter comes to firewalls 2018-02-20

    tags: linux, linux/kernel, network, network/firewall, network/packet, network/router

    [ permalink ]

    • https://lwn.net/Articles/747504/
    • https://lwn.net/Articles/747557/
    • https://en.wikipedia.org/wiki/Berkeley_Packet_Filter
49. security - What is a retpoline and how does it work? - Stack Overflow 2018-02-11

    tags: linux, linux/kernel, meltdown, security, spectre

    [ permalink ]

    • https://support.google.com/faqs/answer/7625886
    • https://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-misc.git/commit/?h=spec/retpoline-415-1
    • https://lkml.org/lkml/2018/1/4/724
50. Elixir Cross Referencer: new way to browse kernel sources 2018-01-20

    tags: linux, source-code-management, source-code-management/git, web

    [ permalink ]

    • https://github.com/free-electrons/elixir
    • http://elixir.free-electrons.com/linux/latest/source
51. Ext4 Wiki 2018-01-18

    tags: disk, file, filesystem/ext4, linux, linux/kernel, partition

    [ permalink ]

    • https://ext4.wiki.kernel.org/index.php/Ext4_Howto
    • https://ext4.wiki.kernel.org/index.php/Ext4_Disk_Layout
    • http://www.nongnu.org/ext2-doc/
52. Who was responsible for leaking the Meltdown/Spectre story beforehand, and thus breaking the co-ordinated patched release planned for 9th-Jan between various vendors? 2018-01-08

    tags: hack, hardware, hardware/cpu, intel, linux, memory, security

    [ permalink ]

    • https://cyber.wtf/2017/07/28/negative-result-reading-kernel-memory-from-user-mode/
    • https://cyber.wtf/2018/01/05/behind-the-scene-of-a-bug-collision/
    • https://lwn.net/Articles/738975/
    • https://lwn.net/Articles/741878/
    • https://lwn.net/Articles/741882/
    • https://twitter.com/misc0110/status/948706387491786752
    • https://www.theregister.co.uk/2018/01/02/intel_cpu_design_flaw/
53. Boot freeze with linux 4.13 and 4.14 / Kernel & Hardware / Arch Linux Forums 2017-12-21

    tags: ati, boot, gpu, linux, linux/kernel, radeon

    [ permalink ]

    • https://wiki.archlinux.org/index.php/AMDGPU
    • https://www.phoronix.com/scan.php?page=article&item=linux-413-gcn101&num=1
    • https://bbs.archlinux.org/viewtopic.php?id=232252
54. Tracing a packet journey using Linux tracepoints, perf and eBPF | Yet another enthusiast blog! 2017-11-20

    tags: linux, linux/container/docker, linux/kernel/ebpf, network, network/packet, observability/tracing, programming/c, programming/python

    [ permalink ]

    • https://github.com/yadutaf/tracepkt
55. Linux eBPF Tracing Tools 2017-11-20

    tags: linux, linux/kernel, linux/kernel/ebpf, network, network/packet, observability/tracing

    [ permalink ]

    • http://www.brendangregg.com/blog/2015-05-15/ebpf-one-small-step.html
    • https://www.reddit.com/r/linux/comments/364twa/linux_ebpf_one_small_step/
    • https://opensource.com/article/17/9/intro-ebpf
    • https://github.com/iovisor/bcc
    • http://www.man7.org/linux/man-pages/man2/bpf.2.html
56. Heterogeneous memory management [LWN.net] 2017-09-26

    tags: gpu, hardware/cpu, linux, linux/kernel, memory

    [ permalink ]

    • https://www.phoronix.com/scan.php?page=search&q=Heterogeneous+Memory+Management
    • https://www.phoronix.com/scan.php?page=news_item&px=Nouveau-Compote
    • https://cgit.freedesktop.org/~glisse/compote/
    • https://www.infoworld.com/article/3196884/machine-learning/faster-machine-learning-is-coming-to-the-linux-kernel.html
57. The Linux Kernel documentation — The Linux Kernel documentation 2017-08-20

    tags: documentation, documentation/sphinx, linux, linux/kernel, programming/python, read-the-docs, rtfm

    [ permalink ]

    • https://www.youtube.com/watch?v=jY_C-Z0qMSo
58. Introduction to Realtime Linux 2017-08-20

    tags: irq, linux, linux/kernel, real-time

    [ permalink ]

    • http://linuxgizmos.com/real-time-linux-explained/
59. realtime:start [Linux Foundation Wiki] 2017-08-20

    tags: irq, linux, linux/kernel, real-time

    [ permalink ]

    • https://www.kernel.org/pub/linux/kernel/projects/rt/
    • https://wiki.linuxfoundation.org/realtime/preempt_rt_versions
    • https://rt.wiki.kernel.org/index.php/Main_Page
    • https://rt.wiki.kernel.org/index.php/Frequently_Asked_Questions
60. syscalls(2) - Linux manual page 2017-05-30

    tags: glibc, linux, linux/kernel, programming/api, programming/c, system

    [ permalink ]