On Wednesday, 11 July 2007 13:54, Miklos Szeredi wrote: > > > > regarding the freezer, how it is bad and how we should drop it, > > > > because it breaks things (which NB is not true, because it doesn't). > > > > > > This thread started out from a bug, that seemed to be caused by the > > > freezer (we still don't exactly know what it was caused by), and the > > > discussion uncovered various problems _with_ the freezer, that up to > > > now no other _proper_ solutions have been propsed than to remove the > > > freezer. > > > > First, please list those problems for completness. Moreover, I think they > > should be documented if they haven't been yet. > > Suspend failing due to ordering requirements from fuse, I think you > documented this one. > > Suspend failing due to malicious/buggy fuse filesystem. > > Suspend failing if network filesystem is mounted, and network or > server is down. This is one of those "we can live with it" things > that only happen rarely, and it's annoying then, but soon forgotten.
All of the above boil down to the freezer limitation regarding uninterruptible tasks. And yes, I think it should be explicitly documented. > Freezing of tasks is slowing down suspend. Don't know how serious > this is, suspend is pretty fast, but could possibly be even faster. Hmm, I don't know either. I'm not seeing this in my tests, but well, more data will be appreciated. The sync probably slows down more than the freezing itself ... > Don't know what the OLPC guys do to make suspending extremely quick, > are they freezing any tasks? They used to, but I'm not sure if they do. > > Second, there were many more problems with the freezer in the past and we > > were able to eliminate them over time. It sometimes is difficult to invent > > a > > viable solution on demand ... > > OK, if you elimitate all of the above problems with the freezer, I'll > say no more against it. I think the ordering issue may be eliminated, to some extent. I have a patch for that, but you were CCed on that patch series, so you should know. ;-) The other ones are more difficult, so time will tell. Greetings, Rafael -- "Premature optimization is the root of all evil." - Donald Knuth - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
