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. > >> And as I previous said, we have to solve oom_killer_disabled issue in >> do_try_to_free_pages. >> >> Thanks, Dave. >> -- >> Kind regards, >> Minchan Kim >> > > > > -- > Regards > dave > -- Regards dave -- 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>