Saturday, February 1, 2025
Wednesday, January 15, 2025
Fedora 41 : evtest basic tool for linux devices.
The evtest is c - Input device event monitor and query tool.
root@fedora:/home/mythcat# dnf5 install evtest
Updating and loading repositories:
Repositories loaded.
Package Arch Version Repository Size
Installing:
evtest x86_64 1.35-8.fc41 fedora 63.0 KiB
Transaction Summary:
Installing: 1 package
Total size of inbound packages is 30 KiB. Need to download 30 KiB.
After this operation, 63 KiB extra will be used (install 63 KiB, remove 0 B).
...
root@fedora:/home/mythcat# evtest
No device specified, trying to scan all of /dev/input/event*
Available devices:
/dev/input/event0: Sleep Button
/dev/input/event1: Lid Switch
/dev/input/event10: HDA Intel Line
/dev/input/event11: HDA Intel Headphone
/dev/input/event12: PixArt USB Optical Mouse
/dev/input/event2: Power Button
/dev/input/event3: AT Translated Set 2 keyboard
/dev/input/event4: SynPS/2 Synaptics TouchPad
/dev/input/event5: Video Bus
/dev/input/event6: ST LIS3LV02DL Accelerometer
/dev/input/event7: Quickstart Button 1
/dev/input/event8: HP WMI hotkeys
/dev/input/event9: HDA Intel Mic
Select the device event number [0-12]:Sunday, January 5, 2025
Fedora 41 : the pref tool under Fedora.
Today I tested the perf tool in Fedora 41 and it is a bit difficult to use. I documented myself and found some information on the web and in the online linux community. Here is what I thought was worth remembering and what I tested.
The pref tool can't run anyway:
mythcat@fedora:~/PythonProjects$ perf record -e cache-misses,page-faults,minor-faults,major-faults,cpu-migrations,L1-dcache-load-misses,L1-dcache-store-misses,L1-icache-load-misses,LLC-load-misses,LLC-store-misses,dTLB-load-misses,dTLB-store-misses,iTLB-load-misses
Error:
Access to performance monitoring and observability operations is limited.
Enforced MAC policy settings (SELinux) can limit access to performance
monitoring and observability operations. Inspect system audit records for
more perf_event access control information and adjusting the policy.
Consider adjusting /proc/sys/kernel/perf_event_paranoid setting to open
access to performance monitoring and observability operations for processes
without CAP_PERFMON, CAP_SYS_PTRACE or CAP_SYS_ADMIN Linux capability.
More information can be found at 'Perf events and tool security' document:
https://www.kernel.org/doc/html/latest/admin-guide/perf-security.html
perf_event_paranoid setting is 2:
-1: Allow use of (almost) all events by all users
Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK
>= 0: Disallow raw and ftrace function tracepoint access
>= 1: Disallow CPU event access
>= 2: Disallow kernel profiling
To make the adjusted perf_event_paranoid setting permanent preserve ...I used with sudo , wait and Ctrl + C to stop:
mythcat@fedora:~/PythonProjects$ sudo perf record -e cache-misses,page-faults,minor-faults,major-faults,cpu-migrations,L1-dcache-load-misses,L1-dcache-store-misses,L1-icache-load-misses,LLC-load-misses,LLC-store-misses,dTLB-load-misses,dTLB-store-misses,iTLB-load-misses ...To get the accurate number of events count then number of results:
mythcat@fedora:~/PythonProjects$ perf report -D -i perf.data | grep RECORD_SAMPLE | wc -l
22461I get my pref data and I saw all my system data with:
mythcat@fedora:~/PythonProjects$ sudo perf report -f -i perf.data 
Friday, January 3, 2025
Fedora 41 : NVim from sources or packages !
Today I tried the nvim and saw this big issue:
root@fedora:/home/mythcat# dnf5 install neovim
...
Package Arch Version Repository Size
Installing:
neovim x86_64 0.10.2-1.fc41 fedora 29.1 MiB
...
Installing weak dependencies:
nodejs x86_64 1:22.11.0-3.fc41 updates 148.5 KiB
nodejs-docs noarch 1:22.11.0-3.fc41 updates 91.9 MiB
nodejs-full-i18n x86_64 1:22.11.0-3.fc41 updates 29.3 MiB
nodejs-npm x86_64 1:10.9.0-1.22.11.0.3.fc41 updates 9.4 MiB
ripgrep x86_64 14.1.1-1.fc41 updates 4.7 MiB
tree-sitter-cli x86_64 0.23.2-1.fc41 updates 12.4 MiB
wl-clipboard x86_64 2.2.1-3.fc41 fedora 140.9 KiB
xsel x86_64 1.2.1-2.fc41 fedora 47.9 KiB
You can see comes with nodejs. I remove the nodejs and I tested nvim and works.
Using the source code works also well:
root@fedora:/home/mythcat# curl -LO https://github.com/neovim/neovim/releases/latest/download/nvim-linux64.tar.gz
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0
100 11.4M 100 11.4M 0 0 5739k 0 0:00:02 0:00:02 --:--:-- 14.1M
root@fedora:/home/mythcat# sudo rm -rf /opt/nvim
root@fedora:/home/mythcat# sudo tar -C /opt -xzf nvim-linux64.tar.gz
root@fedora:/home/mythcat# export PATH="$PATH:/opt/nvim-linux64/bin"
root@fedora:/home/mythcat# nvim
Wednesday, January 1, 2025
Fedora 41 : Fix size of logical volume ... happy new year 2025!
Happy New Year 2025!
Today I come with this issue, is very old one ...
mythcat@fedora:~$ sudo vgs
[sudo] password for mythcat:
VG #PV #LV #SN Attr VSize VFree
fedora 1 1 0 wz--n- 73.51g 58.51g
mythcat@fedora:~$ sudo lvresize -l +100%FREE --resizefs /dev/mapper/fedora-root
Size of logical volume fedora/root changed from 15.00 GiB (3840 extents) to 73.51 GiB (18819 extents).
File system xfs found on fedora/root mounted at /.
Extending file system xfs to 73.51 GiB (78932606976 bytes) on fedora/root...
xfs_growfs /dev/fedora/root
meta-data=/dev/mapper/fedora-root isize=512 agcount=4, agsize=983040 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=1, sparse=1, rmapbt=1
= reflink=1 bigtime=1 inobtcount=1 nrext64=1
data = bsize=4096 blocks=3932160, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0, ftype=1
log =internal log bsize=4096 blocks=16384, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 3932160 to 19270656
xfs_growfs done
Extended file system xfs on fedora/root.
Logical volume fedora/root successfully resized.
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