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build: image: support specifying mksquashfs4 parallel threads 

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>
pull/19019/head
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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16
config/Config-images.in
View File

@ -160,6 +160,22 @@ menu "Target Images"
Select squashfs block size, must be one of:
4, 8, 16, 32, 64, 128, 256, 512, 1024
config TARGET_SQUASHFS_BLOCK_READERS
int "mksquashfs tool parallel block reader threads"
depends on TARGET_ROOTFS_SQUASHFS
default 4
help
Specify the number of parallel block reader threads
(for files equal or larger than the squashfs block size).
config TARGET_SQUASHFS_SMALL_READERS
int "mksquashfs tool parallel small file reader threads"
depends on TARGET_ROOTFS_SQUASHFS
default 4
help
Specify the number of parallel small file reader threads
(for files less than the squashfs block size).
menuconfig TARGET_ROOTFS_UBIFS
bool "ubifs"
default y if USES_UBIFS

2
include/image.mk
View File

@ -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)