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erofs: introduce the page cache share feature

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Currently, reading files with different paths (or names) but the same
content will consume multiple copies of the page cache, even if the
content of these page caches is the same. For example, reading
identical files (e.g., *.so files) from two different minor versions of
container images will cost multiple copies of the same page cache,
since different containers have different mount points. Therefore,
sharing the page cache for files with the same content can save memory.

This introduces the page cache share feature in erofs. It allocate a
shared inode and use its page cache as shared. Reads for files
with identical content will ultimately be routed to the page cache of
the shared inode. In this way, a single page cache satisfies
multiple read requests for different files with the same contents.

We introduce new mount option `inode_share` to enable the page
sharing mode during mounting. This option is used in conjunction
with `domain_id` to share the page cache within the same trusted
domain.

Signed-off-by: Hongzhen Luo <hongzhen@linux.alibaba.com>
Signed-off-by: Hongbo Li <lihongbo22@huawei.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
This commit is contained in:
Hongzhen Luo
2026-01-23 01:31:28 +00:00
committed by Gao Xiang
parent e77762e896
commit 5ef3208e3b
7 changed files with 301 additions and 2 deletions
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5
Documentation/filesystems/erofs.rst
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@@ -131,7 +131,12 @@ fsid=%s Specify a filesystem image ID for Fscache back-end.
domain_id=%s Specify a trusted domain ID for fscache mode so that
different images with the same blobs, identified by blob IDs,
can share storage within the same trusted domain.
Also used for different filesystems with inode page sharing
enabled to share page cache within the trusted domain.
fsoffset=%llu Specify block-aligned filesystem offset for the primary device.
inode_share Enable inode page sharing for this filesystem. Inodes with
identical content within the same domain ID can share the
page cache.
=================== =========================================================
Sysfs Entries