[$] The io.weight I/O-bandwidth controller

Part of the kernel's job is to arbitrate access to the available hardwareresources and ensure that every process gets its fair share, with "its fairshare" being defined by policies specified by the administrator. Oneresource that must be managed this way is I/O bandwidth to storage devices;if due care is not taken, an I/O-hungry process can easily saturate adevice, starving out others. The kernel has had a few I/O-bandwidthcontrollers over the years, but the results have never been entirelysatisfactory. But there is a newcontroller on the block that might just get the job done.