Am 27.07.2011 14:37, schrieb Stefan Hajnoczi: > Hi, > Here is a list of block layer and storage changes that have been discussed. > It > is useful to have a roadmap of changes in order to avoid duplication, allow > more developers to contribute, and to communicate the direction of storage in > QEMU. > > I suggest we first do a braindump of all changes that have been discussed. > Later we can discuss specific changes and if/when they fit into the roadmap - > please don't jump into discussion about specific changes yet. > > Kevin: I hope this a useful starting point. Here are all the items > that I am aware of: > > =Material for next QEMU release= > > Coroutines in the block layer [Kevin] > * Programming model to simplify block drivers without blocking QEMU threads > > Generic copy-on-read [Stefan] > * Populate image file to avoid fetching same block from backing file > again later > > Generic image streaming [Stefan] > * Make block_stream commands available for all image formats that > support backing files > > Live block copy [Marcelo/Kevin/Stefan?] > * Copy the contents of an image file while a guest is using it > > In-place qcow2 <-> qed conversion [Devin, GSoC 2011]: > * Fast conversion between qcow2 and qed image formats without copy all data > > VMDK enhancements [Fam, GSoC 2011] > * Implement latest VMDK specs to support modern image files > > Block I/O limits [Zhi Yong] > * Resource control for guest I/O bandwidth/iops consumption
Another item that just came up on IRC again: Allow guests to toggle WCE, so that we finally can get rid of the cache=writethrough default. We should definitely get this done before 1.0. Kevin
