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]:

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 performance of Python with `perf` support is not great, and is going to get a lot worse.

Python - pref profiling

perf engineering with python

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
22461

I get my pref data and I saw all my system data with:

mythcat@fedora:~/PythonProjects$ sudo perf report -f -i perf.data 

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

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.