On Thursday 15 June 2006 11:03 am, Pavel Machek wrote: > > > > In this case, DMA only would need to be prevented during the actual > > construction of the snapshot -- which is AFTER that "prepare to > > suspend" phase, notice! -- so your straw-man doesn't apply. > > Okay, you _can_ do > > suspend whole tree but disk and video > freeze disk and video > create snapshot > unfreeze disk and video > write snapshot > powerdown > > Question is: looks to me like quite a lot of complexity for very > little gain, but... It's not so different from what Linus has been sketching, except for the actual turn-off-DMA step. (Needed because you want to get an atomic snapshot.) In terms of $SUBJECT the gain is that you actually get a debuggable suspend sequence.
