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Use file system extents for the kernel partition (#1406)

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In the past file system extents have been deactivated to get better
performance in U-Boot. However, the performance issue has been addressed
with commit d5aee659f217 ("fs: ext4: cache extent data") in U-Boot. The
performance should be equal to regular files using no extents.

Enabling extents has an advantage however: Files are stored more
efficently, especially relatively large files like a kernel image. The
impact is not all that big (~100KiB), but worthwhile nonetheless.
This commit is contained in:
Stefan Agner 2021-06-14 11:26:29 +02:00 committed by GitHub
parent cceb5dcf39
commit cfb68c5b39
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buildroot-external/scripts/hdd-image.sh
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@ -90,7 +90,7 @@ function create_kernel_image() {
# Make image
rm -f "${kernel_img}"
truncate --size="${KERNEL_SIZE}" "${kernel_img}"
mkfs.ext4 -L "hassos-kernel" -E lazy_itable_init=0,lazy_journal_init=0 -O ^extent,^64bit "${kernel_img}"
mkfs.ext4 -L "hassos-kernel" -E lazy_itable_init=0,lazy_journal_init=0 -O ^64bit "${kernel_img}"
# Mount / init file structs
sudo mkdir -p /mnt/data/