A dedicated cache for metadata? - Bernd Schubert

"Currently streaming IO can easily evict metadata from the page cache, unless file systems either bind pages to memory or set up their own buffers.
It can be shown that the object disk layout (hash directories) used bydistributed file systems such as FhGFS, Lustre and Cephfs is not optimally handled by underlying file systems (i.e. ext4, xfs and btrfs). Introducing a dedicated configurable generic metadata cache would solve this and other metadata cache issues. http://etherpad.osuosl.org/lpc2013-fi..." http://www.linuxplumbersconf.org/2013/

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