__   __  ___   _______  _______  _______  _______  ______  
|  |_|  ||   | |       ||       ||       ||       ||      | 
|       ||   | |_     _||_     _||  _____||  _____||  _    |
|       ||   |   |   |    |   |  | |_____ | |_____ | | |   |
|       ||   |   |   |    |   |  |_____  ||_____  || |_|   |
| ||_|| ||   |   |   |    |   |   _____| | _____| ||       |
|_|   |_||___|   |___|    |___|  |_______||_______||______| 

Contact Information

Maintainer: Huaicheng Li (huaicheng@cs.uchicago.edu)

This repo hosts the (SSD-part) source code for our MittOS paper at SOSP'17. And the bib entry is:

@InProceedings{Hao+17-MittOS, 
       Author = {Mingzhe Hao and Huaicheng Li and Michael Hao Tong and Chrisma Pakha 
                 and Riza O. Suminto and Cesar A. Stuardo and Andrew A. Chien and Haryadi S. Gunawi},
        Title = "{MittOS: Supporting Millisecond Tail Tolerance with Fast Rejecting SLO-Aware OS Interface}",
    BookTitle = {The 26th ACM Symposium on Operating Systems Principles (SOSP)},
      Address = {Shanghai, China},
        Month = {October},
         Year = {2017}
}

Requirement

You need an OCSSD to run the code.

Compilation

make defconfig
# then ``make menuconfig`` to manually enable pblk and other drivers you need
make -j8
sudo make modules_install
sudo make install

This will install a new kernel to your system. Reboot your host system to run it.

MittSSD /sys interface

MittSSD provides some /sys interface for interactions with LightNVM from user space. Checkout the code drivers/lightnvm/pblk-sys.c for MittSSD related ones.

MittSSD code structure:

• syscall and file system layers: added logics to pass the SLO and fast-rejection information through the entire storage stack

• LightNVM: serving as the host-managed device layer. MittSSD extends it with a fine-grnular latency monitoring module for accurate SLO prediction, based on pre-profiled NAND level latencies.

• The read() syscall is extended with a SLO parameter, upon receiving MittSSD returned failure, the application could retry a read() from the replicas.