On Tuesday 22 May 2007 20:15, Antonino Ingargiola wrote: > 2007/5/21, Ingo Molnar <[EMAIL PROTECTED]>: > > * Con Kolivas <[EMAIL PROTECTED]> wrote: > > > > A suggestion for improvement: right now swap-prefetch does a small > > > > bit of swapin every 5 seconds and stays idle inbetween. Could this > > > > perhaps be made more agressive (optionally perhaps), if the system > > > > is not swapping otherwise? If block-IO level instrumentation is > > > > needed to determine idleness of block IO then that is justified too > > > > i think. > > > > > > Hmm.. The timer waits 5 seconds before trying to prefetch, but then > > > only stops if it detects any activity elsewhere. It doesn't actually > > > try to go idle in between but it doesn't take much activity to put it > > > back to sleep, hence detecting yet another "not quite idle" period and > > > then it goes to sleep again. I guess the sleep interval can actually > > > be changed as another tunable from 5 seconds to whatever the user > > > wanted. > > > > there was nothing else running on the system - so i suspect the swapin > > activity flagged 'itself' as some 'other' activity and stopped? The > > swapins happened in 4 bursts, separated by 5 seconds total idleness. > > I've noted burst swapins separated by some seconds of pause in my > desktop system too (with sp_tester and an idle gnome).
That really is expected, as just about anything, including journal writeout, would be enough to put it back to sleep for 5 more seconds. -- -ck - 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/
