This is my first at adding fscache support for the Ceph Linux module. My motivation for doing this work was speedup our distributed database that uses the Ceph filesystem as a backing store. By far more of the workload that our application is doing is read only and latency is our biggest challenge. Being able to cache frequently used blocks on the SSD drives that our machines use dramatically speeds up our query setup time when we're fetching multiple compressed indexes and then navigating the block tree. The branch containing the two patches is here: https://bitbucket.org/adfin/linux-fs.git in the forceph branch. If you want to review it in your browser here is the bitbucket url: https://bitbucket.org/adfin/linux-fs/commits/branch/forceph I've tested this both in mainline and in the branch that features upcoming fscache changes. The patches are broken into two pieces. 01 - Setups the facility for fscache in it's independent files 02 - Enables fscache in the ceph filesystem and adds a new configuration option The patches will follow in the new few emails as well. Future wise; there's some new work being done to add write-back caching to fscache & NFS. When that's done I'd like to integrated the Ceph fscache implementation. From the benchmarks of the author of that it seams like it has much the same benefit for write to NFS as bcache does. I'd like to get this into ceph, and I'm looking for feedback. Thanks, - Milosz -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
