On 04/15/2017 12:55 PM, Matias Bjørling wrote: > Hi Jens, > > With this merge window, we like to push pblk upstream. It is a new > host-side translation layer that implements support for exposing > Open-Channel SSDs as block devices. > > We have described pblk in the LightNVM paper "LightNVM: The Linux > Open-Channel SSD Subsystem" that was accepted at FAST 2017. The paper > defines open-channel SSDs, the subsystem, pblk and has an evaluation as > well. Over the past couple of kernel versions we have shipped the > support patches for pblk, and we are now comfortable pushing the core of > pblk upstream. > > The core contains the logic to control data placement and I/O scheduling > on open-channel SSDs. Including implementation of translation table > management, GC, recovery, rate-limiting, and similar components. It > assumes that the SSD is media-agnostic, and runs on both 1.2 and 2.0 of > the Open-Channel SSD specification without modifications. > > I want to point out two neat features of pblk. First, pblk can be > instantiated multiple times on the same SSD, enabling I/O isolation > between tenants, and makes it able to fulfill strict QoS requirements. > We showed results from this at the NVMW '17 workshop this year, while > presenting the "Multi-Tenant I/O Isolation with Open-Channel SSDs" talk. > Second, now that a full host-side translation layer is implemented, one > can begin to optimize its data placement and I/O scheduling algorithms > to match user workloads. We have shown a couple of the benefits in the > LightNVM paper, and we know of a couple of companies and universities > that have begun making new algorithms. > > In detail, this pull request contains: > > - The new host-side FTL pblk from Javier, and other contributors. > > - Add support to the "create" ioctl to force a target to be > re-initialized at using "factory" flag from Javier. > > - Fix various errors in LightNVM core from Javier and me. > > - An optimization from Neil Brown to skip error checking on mempool > allocations that can sleep. > > - A buffer overflow fix in nvme_nvm_identify from Scott Bauer. > > - Fix for bad block discovery handle error handling from Christophe > Jaillet. > > - Fixes from Dan Carpenter to pblk after it went into linux-next. > > Please pull from the for-jens branch or apply the patches posted with > this mail: > > https://github.com/OpenChannelSSD/linux.git for-jens Applied for 4.12, thanks Matias. -- Jens Axboe
