usr: Add support for zstd compressed initramfs
- Add support for a zstd compressed initramfs. - Add compression for compressing built-in initramfs with zstd. I have tested this patch by boot testing with buildroot and QEMU. Specifically, I booted the kernel with both a zstd and gzip compressed initramfs, both built into the kernel and separate. I ensured that the correct compression algorithm was used. I tested on arm, aarch64, i386, and x86_64. This patch has been tested in production on aarch64 and x86_64 devices. Additionally, I have performance measurements from internal use in production. On an aarch64 device we saw 19 second boot time improvement from switching from lzma to zstd (27 seconds to 8 seconds). On an x86_64 device we saw a 9 second boot time reduction from switching from xz to zstd. Signed-off-by: Nick Terrell <terrelln@fb.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Tested-by: Sedat Dilek <sedat.dilek@gmail.com> Reviewed-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20200730190841.2071656-5-nickrterrell@gmail.com
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usr/Kconfig
20
usr/Kconfig
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@ -100,6 +100,15 @@ config RD_LZ4
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Support loading of a LZ4 encoded initial ramdisk or cpio buffer
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If unsure, say N.
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config RD_ZSTD
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bool "Support initial ramdisk/ramfs compressed using ZSTD"
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default y
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depends on BLK_DEV_INITRD
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select DECOMPRESS_ZSTD
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help
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Support loading of a ZSTD encoded initial ramdisk or cpio buffer.
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If unsure, say N.
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choice
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prompt "Built-in initramfs compression mode"
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depends on INITRAMFS_SOURCE != ""
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@ -196,6 +205,17 @@ config INITRAMFS_COMPRESSION_LZ4
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If you choose this, keep in mind that most distros don't provide lz4
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by default which could cause a build failure.
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config INITRAMFS_COMPRESSION_ZSTD
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bool "ZSTD"
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depends on RD_ZSTD
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help
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ZSTD is a compression algorithm targeting intermediate compression
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with fast decompression speed. It will compress better than GZIP and
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decompress around the same speed as LZO, but slower than LZ4.
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If you choose this, keep in mind that you may need to install the zstd
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tool to be able to compress the initram.
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config INITRAMFS_COMPRESSION_NONE
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bool "None"
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help
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@ -15,6 +15,7 @@ compress-$(CONFIG_INITRAMFS_COMPRESSION_LZMA) := lzma
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compress-$(CONFIG_INITRAMFS_COMPRESSION_XZ) := xzmisc
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compress-$(CONFIG_INITRAMFS_COMPRESSION_LZO) := lzo
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compress-$(CONFIG_INITRAMFS_COMPRESSION_LZ4) := lz4
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compress-$(CONFIG_INITRAMFS_COMPRESSION_ZSTD) := zstd
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obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o
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