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build: image: support specifying mksquashfs4 parallel threads

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By enabling multi-threading file reading, the squashfs rootfs build
process can be greatly accelerated. We use 4 as the default thread
number. This is the default value for squashfs4 tool 4.7 if we don't
append "-block-readers" or "-small-readers" options.

For more test results:
https://github.com/plougher/squashfs-tools/blob/4.7/Documentation/4.7/README

Signed-off-by: Shiji Yang <yangshiji66@outlook.com>
Link: https://github.com/openwrt/openwrt/pull/19019
Signed-off-by: Nick Hainke <vincent@systemli.org>
This commit is contained in:
Shiji Yang
2025-06-04 18:16:12 +08:00
committed by Nick Hainke
parent dbfe3551d9
commit a9972ae53e
2 changed files with 18 additions and 0 deletions
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include/image.mk
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@@ -86,6 +86,8 @@ SQUASHFS_BLOCKSIZE := $(CONFIG_TARGET_SQUASHFS_BLOCK_SIZE)k
SQUASHFSOPT := -b $(SQUASHFS_BLOCKSIZE)
SQUASHFSOPT += -p '/dev d 755 0 0' -p '/dev/console c 600 0 0 5 1'
SQUASHFSOPT += $(if $(CONFIG_SELINUX),-xattrs,-no-xattrs)
SQUASHFSOPT += -block-readers $(CONFIG_TARGET_SQUASHFS_BLOCK_READERS)
SQUASHFSOPT += -small-readers $(CONFIG_TARGET_SQUASHFS_SMALL_READERS)
SQUASHFSCOMP := gzip
LZMA_XZ_OPTIONS := -Xpreset 9 -Xe -Xlc 0 -Xlp 2 -Xpb 2
ifeq ($(CONFIG_SQUASHFS_XZ),y)