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1001042e54
LZ4 always reuses the decompressed buffer as its LZ77 sliding window (dynamic dictionary) for optimal performance. However, in specific cases, the output buffer may not fully contain valid page cache pages, resulting in the use of short-lived pages for temporary purposes. Due to the limited sliding window size, LZ4 shortlived bounce pages can also be reused in a sliding manner, so each bounce page can be vmapped multiple times in different relative positions by design. In order to avoiding double frees, currently, reuse counts are recorded via page refcount, but it will no longer be used as-is in the future world of Memdescs. Just maintain a lookup table to check if a shortlived page is reused. Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com> Link: https://lore.kernel.org/r/20240711053659.1364989-1-hsiangkao@linux.alibaba.com |
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| .. | ||
| compress.h | ||
| data.c | ||
| decompressor_deflate.c | ||
| decompressor_lzma.c | ||
| decompressor_zstd.c | ||
| decompressor.c | ||
| dir.c | ||
| erofs_fs.h | ||
| fscache.c | ||
| inode.c | ||
| internal.h | ||
| Kconfig | ||
| Makefile | ||
| namei.c | ||
| super.c | ||
| sysfs.c | ||
| xattr.c | ||
| xattr.h | ||
| zdata.c | ||
| zmap.c | ||
| zutil.c | ||