8000 strip kernel modules · Issue #36 · anatol/booster · GitHub
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strip kernel modules #36

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oech3 opened this issue Feb 20, 2021 · 4 comments
Closed

strip kernel modules #36

oech3 opened this issue Feb 20, 2021 · 4 comments

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@oech3
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oech3 commented Feb 20, 2021

initramfs size is reduced by stripping kernel modules.
mkinitcpio has strip hook.
@anatol
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anatol commented Mar 2, 2021

Sounds like a good idea to decease size of the image.

And I think strip should be called for regular binaries as well.

@anatol
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anatol commented Mar 2, 2021

I am looking at the strip hook from mkinitcpio and it looks like stripping is not run for kernel modules. It is run for regular binaries and shared/static libraries only.

    find "$BUILDROOT" -type f -perm -u+w -print0 2>/dev/null | while read -d '' bin; do
        case $(file -bi "$bin") in
            *application/x-sharedlib*)
                # Libraries (.so)
                strip --strip-unneeded "$bin"
                ;;
            *application/x-archive*)
                # Libraries (.a)
                strip --strip-debug "$bin"
                ;;
            *application/x-executable*)
                # Binaries
                strip --strip-all "$bin"
                ;;
        esac
    done

@anatol
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anatol commented Mar 2, 2021 •
edited
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So for kernel modules and shared libraries we need to use --strip-unneeded and for ELF binaries --strip-all. I have a change locally that seems work fine.

Stripping ELF binaries decreases size of the final image by about 5%. It is because Arch binaries already exclude debug symbols and there is not that much to strip.

@anatol anatol closed this as completed in b9708be Mar 2, 2021
anatol added a commit that referenced this issue Mar 2, 2021
@anatol
Add possibility to strip ELF binaries
e24cc0f 
This helps to cut some amount of unneeded information from binaries and
reduce the final image size a bit. My tests show ~5% image size
reduction.

The feature can be either enabled with 'strip' config option or with '-strip'
command line flag.

Closes #36
@anatol
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anatol commented Mar 2, 2021

The functionality is implemented at master branch. PTAL and let me know if you see any issues.

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