Hi folks, This patchset is mainly intended for the upcoming LZMA preparation, but they still have some benefits to the exist LZ4 decompression.
The first patch looks up compression algorithms on mapping instead of in the decompression frontend, which is used for the rest patches. The second patch introduces another compression HEAD (HEAD2) so that each file can be compressed with two different algorithms at most, which can be used for the upcoming LZMA compression and LZ4 range dictionary compression for various data patterns. The third patch introduces a new readmore decompression strategy to avoid partial decompression for large big pcluster. It resolves the randread issue mentioned in the original big pcluster patchset [1]: randread Kernel: 5.15.0-rc2+ pclustersize Vanilla Patched 4096 54.6 MiB/s 54.0 MiB/s 16384 117.4 MiB/s 143.8 MiB/s 32768 113.6 MiB/s 199.6 MiB/s 65536 72.8 MiB/s 236.4 MiB/s The latest version can also be fetched from git://git.kernel.org/pub/scm/linux/kernel/git/xiang/linux.git -b erofs/readmore [1] https://lore.kernel.org/r/[email protected] Thanks, Gao Xiang Gao Xiang (3): erofs: get compression algorithms directly on mapping erofs: introduce the secondary compression head erofs: introduce readmore decompression strategy fs/erofs/compress.h | 5 -- fs/erofs/erofs_fs.h | 8 ++- fs/erofs/internal.h | 28 ++++++++- fs/erofs/zdata.c | 106 ++++++++++++++++++++++++++--------- fs/erofs/zmap.c | 57 ++++++++++++------- include/trace/events/erofs.h | 2 +- 6 files changed, 150 insertions(+), 56 deletions(-) -- 2.20.1
