forked from Minki/linux
06a304cd9c
For each pcluster, the total compressed buffers are determined in advance, yet the number of decompressed buffers actually vary. Too many decompressed pages can be recorded if one pcluster is highly compressed or its pcluster size is large. That takes extra memory footprints compared to uncompressed filesystems, especially a lot of I/O in flight on low-ended devices. Therefore, similar to inplace I/O, pagevec was introduced to reuse page cache to store these pointers in the time-sharing way since these pages are actually unused before decompressing. In order to make it more flexable, a cleaner bufvec is used to replace the old pagevec stuffs so that - Decompressed offsets can be stored inline, thus it can be used for the upcoming feature like compressed data deduplication. It's calculated by `page_offset(page) - map->m_la'; - Towards supporting large folios for compressed inodes since our final goal is to completely avoid page->private but use folio->private only for all page cache pages. Acked-by: Chao Yu <chao@kernel.org> Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com> Link: https://lore.kernel.org/r/20220715154203.48093-5-hsiangkao@linux.alibaba.com |
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| .. | ||
| compress.h | ||
| data.c | ||
| decompressor_lzma.c | ||
| decompressor.c | ||
| dir.c | ||
| erofs_fs.h | ||
| fscache.c | ||
| inode.c | ||
| internal.h | ||
| Kconfig | ||
| Makefile | ||
| namei.c | ||
| pcpubuf.c | ||
| super.c | ||
| sysfs.c | ||
| tagptr.h | ||
| utils.c | ||
| xattr.c | ||
| xattr.h | ||
| zdata.c | ||
| zdata.h | ||
| zmap.c | ||
| zpvec.h | ||