Re: grub-mkconfig doesn't change /boot/grub/grub.cfg

[Xu, Bo]

Anatoly,
  Thanks for reply. I miss-stated the issue. It should NOT to change kernel 
config   CONFIG_PSI_DEFAULT_DISABLED.
  It is to enable PSI by customizing grub-reboot following the steps in 
https://nanxiao.me/en/enable-pressure-stall-information-psi-on-void-linux/
  It did not work! PSI still not enabled.
  I noticed that under /etc/grub.d, there are some files missing, like 
"10_linux"

~$ ls -1 /etc/grub.d
05_aka_header
05_debian_theme
06_aka_conf
20_memtest86+
README

My organization customized this. My question:
   Is it possible that without "10_linux", the env variables like 
"GRUB_CMDLINE_LINUX_DEFAULT" in /etc/default/grub will not apply?
   If so, where I can get a copy of "10_linux"?

Please advise.

Regards,

Bo Xu

On 1/28/21, 2:38 AM, "Anatoly Pugachev" <matorola@gmail.com> wrote:

    On Thu, Jan 28, 2021 at 1:22 PM Xu, Bo <bxu@akamai.com> wrote:
    >
    > Hi,
    >
    > I am trying to enable PSI by changing the kernel config:
    >
    >     CONFIG_PSI_DEFAULT_DISABLED=y
    >
    >     to     CONFIG_PSI_DEFAULT_DISABLED=n
    >
    >
    >
    > Here are the steps I did:
    >
    > Added line GRUB_CMDLINE_LINUX_DEFAULT="psi=1” in file /etc/default/grub
    > sudo update-grub       #this executes grub-mkconfig
    > reboot
    >
    >
    >
    > However, after reboot the kernel config is NOT changed.
    >
    > ~$ zgrep PSI /proc/config.gz
    >
    > CONFIG_PSI=y
    >
    > CONFIG_PSI_DEFAULT_DISABLED=y
    >
    >
    >
    > I notice the file /boot/grub/grub.cfg was NOT changed after execution 
update-grub.
    >
    >
    >
    > Is this a bug of grub-mkconfig ???
    >
    >
    >
    > ------------------
    >
    > My linux version:
    >
    >
    >
    > ~$ uname -r
    >
    > 5.4.59-5.4.1.2-amd64-635280dcfe78dc3d

    Bo,

    grub has nothing to do with your current kernel, it's the kernel
    config option. So in order to enable it, you will need to
    reconfigure/recompile your kernel.
    To reconfigure/recompile your kernel, follow your distribution kernel
    compile docs/practices or use generic ones , like
    
https://urldefense.com/v3/__https://kernelnewbies.org/FAQ/KernelCompilation__;!!GjvTz_vk!G66wTM2xFUfQWz9zG8nIUnwRFuZcLiNV5cuaKoBSCW8HdwcHiFGWdtIL0es$