Hi Vivek, Vivek Goyal <vgoyal@xxxxxxxxxx> wrote: > > In addition, > > there are devices which doesn't use standard IO schedulers, and > > dm-ioband can work on even such devices. > > This is a interesting use case. Few thoughts. > > - Can't io scheduling mechanism of these devices make use of elevator and > elevator fair queuing interfaces to take advantage of io controlling > mechanism. It should not be too difficult. Look at noop. It has > just 131 lines of code and it now supports hierarchical io scheduling. > > This will come with request queue and its merging and plug/unplug > mechanism. Is that an issue? > > - If not, then yes, for these corner cases, io scheduler based controller > does not work as it is. I have a extreme fast SSD and its device driver provides its own make_request_fn(). So the device driver intercepts IO requests and the subsequent processes are done within it. Thanks, Ryo Tsuruta -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
