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image_builder: Reduce the boundary mb for reducing image size on arm64

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Qemu merely limits the memory-backend-file size to be aligned to page_size
instead of section size(arm64 1GB). Please see file_ram_alloc() in qemu
exec.c. If we use 1024MB, the generated image size will be 3-4 times bigger
than the original one.

After relaxing it, the image size will be changed from 1G to 300M+ on arm64
with Fedora 29 rootfs's default configuration.

I do see there are some different limitation for ram_block on other arches
(e.g. s390x). So gracefully keep other arches unchanged here.

Fixes #404
Signed-off-by: Jia He <justin.he@arm.com>
This commit is contained in:
Jia He 2020-01-20 16:31:32 +08:00
parent 11a1cf53c2
commit 005c62a871
1 changed files with 2 additions and 4 deletions
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6
image-builder/image_builder.sh
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@ -63,11 +63,9 @@ readonly -a systemd_files=(
# Set a default value # Set a default value
AGENT_INIT=${AGENT_INIT:-no} AGENT_INIT=${AGENT_INIT:-no}
# Align image to (size in MB) according to different architecture.
# In order to support memory hotplug, image must be aligned to
# memory section(size in MB) according to different architecture.
case "$(uname -m)" in case "$(uname -m)" in
aarch64) readonly mem_boundary_mb=1024 ;; aarch64) readonly mem_boundary_mb=16 ;;
*) readonly mem_boundary_mb=128 ;; *) readonly mem_boundary_mb=128 ;;
esac esac