> On Wed, Apr 27, 2011 at 9:37 AM, Dave Young <hidave.darkstar@xxxxxxxxx> wrote: > > On Wed, Apr 27, 2011 at 7:33 AM, Minchan Kim <minchan.kim@xxxxxxxxx> wrote: > >> On Tue, Apr 26, 2011 at 6:39 PM, Dave Young <hidave.darkstar@xxxxxxxxx> wrote: > >>> On Tue, Apr 26, 2011 at 5:28 PM, Minchan Kim <minchan.kim@xxxxxxxxx> wrote: > >>>> Please resend this with [2/2] to linux-mm. > >>>> > >>>> On Tue, Apr 26, 2011 at 5:59 PM, Dave Young <hidave.darkstar@xxxxxxxxx> wrote: > >>>>> When memory pressure is high, virtio ballooning will probably cause oom killing. > >>>>> Even if alloc_page with GFP_NORETRY itself does not directly trigger oom it > >>>>> will make memory becoming low then memory alloc of other processes will trigger > >>>>> oom killing. It is not desired behaviour. > >>>> > >>>> I can't understand why it is undesirable. > >>>> Why do we have to handle it specially? > >>>> > >>> > >>> Suppose user run some random memory hogging process while ballooning > >>> it will be undesirable. > >> > >> > >> In VM POV, kvm and random memory hogging processes are customers. > >> If we handle ballooning specially with disable OOM, what happens other > >> processes requires memory at same time? Should they wait for balloon > >> driver to release memory? > >> > >> I don't know your point. Sorry. > >> Could you explain your scenario in detail for justify your idea? > > > > What you said make sense I understand what you said now. Lets ignore > > my above argue and see what I'm actually doing. > > > > I'm hacking with balloon driver to fit to short the vm migration time. > > > > while migrating host tell guest to balloon as much memory as it can, then start > > migrate, just skip the ballooned pages, after migration done tell > > guest to release the memory. > > > > In migration case oom is not I want to see and disable oom will be good. > > BTW, if oom_killer_disabled is really not recommended to use I can > switch back to oom_notifier way. Could you please explain why you dislike oom_notifier and what problem you faced? I haven't understand why oom_notifier is bad. probably my less knowledge of balloon is a reason. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>