Welcome to the LWN.net Weekly Edition for May 19, 2022

• The netfslib helper library: a relatively new library to collect up common operations for network filesystems.
• Dynamically allocated pseudo-filesystems: a discussion on the right path for adding a general facility that would allow pseudo-filesystems (e.g. tracefs, debugfs) to reduce their memory footprint by allocating inodes and directory entries only when needed.
• Bringing bcachefs to the mainline: The bcachefs filesystem may be getting close to ready for merging.
• Snapshots, inodes, and filesystem identifiers: Filesystems that support snapshots, thus duplicate inode numbers, can be problematic.
• Unique identifiers for NFS: how to create and manage unique IDs needed by NFS.
• Solutions for direct-map fragmentation: a number of new technologies need to carve pages out of the kernel's direct map; how can that functionality be supported without hurting performance?
• Merging the multi-generational LRU: an extended discussion concluded that the time has come to merge this huge change, but some open questions remain.
• CXL 1: Management and tiering: the first three sessions on the Compute Express Link and how it should be managed by the Linux kernel.
• Proactive reclaim for tiered memory and more: there are reasons to want to reclaim memory in a more proactive manner, but it is not clear how any such feature should be controlled.
• Sharing page tables with mshare(): page tables are not normally shared between processes, which can lead to massive overhead in situations where memory is highly shared. This session discussed a proposal for a new system call to enable page-table sharing between cooperating processes.

This week's edition also includes these inner pages:

• Brief items: Brief news items from throughout the community.
• Announcements: Newsletters, conferences, security updates, patches, and more.

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