Benjamin M. Schwartz wrote: > I have a proposal that might be relevant, based on a discussion with > Chris Ball about "hibernation" (i.e. suspend-to-disk). > > Hibernation essentially saves all of userspace RAM into a file on disk, > along with the list of active processes, then shuts down. On the next > boot, it simply reads that file back into memory and continues those > processes. This is a very desirable behavior, as it allows one to pause > one's work and consume precisely zero power. However, hibernation can > require a large amount of disk space, and is relatively fragile in > relation to network connections and hardware state. > > I would like to propose a form of fake hibernation, implemented at the > level of Sugar. If the user clicks the "hibernate" button, Sugar should > tell all open activities to Keep their state, and also save: the list of > open activities, which one was active, any clipboard objects, and which > view was in the foreground. On the next boot, Sugar can simply restart > all open activities from that latest checkpoint, "activate" the active > activity, show the correct view, and recreate the clipboard. This > approach would be far more efficient than hibernation, and IMHO more > reliable as well. > > Fake hibernation relies on a standard reboot sequences, so boot-time > optimization would be very valuable. > > Open questions: > 0. Should "fake hibernate" be a user-visible option? > > 1. Should "fake hibernate" be the default shutdown behavior? > Pro: makes system use feel very continuous. > Con: requires manual shutdown of every activity. Potentially > problematic interaction with memory pressure and OOM under current > implementations.
Shutdown should at least tell all open activities to Keep. That's #6014 (a famous data loss bug: http://www.news.com/8301-10784_3-9859801-7.html) > 2. Should OHM automatically trigger a "fake hibernate" under certain > conditions, such as very low battery, or screen closed for 30 minutes > and no mesh contacts made? Morgan _______________________________________________ Sugar mailing list [email protected] http://lists.laptop.org/listinfo/sugar
