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authorNick Terrell <terrelln@fb.com>2020-07-30 12:08:37 -0700
committerIngo Molnar <mingo@kernel.org>2020-07-31 11:49:08 +0200
commita30d8a39f0571425a459816ed8680e987a2ff279 (patch)
tree4f6f365a0b16eecb18d183ee55c8c5adca58de03 /usr/Makefile
parent48f7ddf785af24aa380f3282d8d4400883d0099e (diff)
downloadlinux-a30d8a39f0571425a459816ed8680e987a2ff279.tar.bz2
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
Diffstat (limited to 'usr/Makefile')
-rw-r--r--usr/Makefile1
1 files changed, 1 insertions, 0 deletions
diff --git a/usr/Makefile b/usr/Makefile
index c12e6b15ce72..b1a81a40eab1 100644
--- a/usr/Makefile
+++ b/usr/Makefile
@@ -15,6 +15,7 @@ compress-$(CONFIG_INITRAMFS_COMPRESSION_LZMA) := lzma
compress-$(CONFIG_INITRAMFS_COMPRESSION_XZ) := xzmisc
compress-$(CONFIG_INITRAMFS_COMPRESSION_LZO) := lzo
compress-$(CONFIG_INITRAMFS_COMPRESSION_LZ4) := lz4
+compress-$(CONFIG_INITRAMFS_COMPRESSION_ZSTD) := zstd
obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o