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Message-ID: <AANLkTinLYy3vUp8VPzv=q3br-zBrE239MRpwMAAsmtKD@mail.gmail.com> Date: Fri, 8 Oct 2010 18:24:23 +0800 From: Dave Young <hidave.darkstar@...il.com> To: Rusty Russell <rusty@...tcorp.com.au> Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, avi@...hat.com, Anthony Liguori <anthony@...emonkey.ws> Subject: Re: [PATCH] kvm: add oom notifier for virtio balloon On Wed, Oct 6, 2010 at 9:50 PM, Dave Young <hidave.darkstar@...il.com> wrote: > On Wed, Oct 6, 2010 at 5:05 PM, Rusty Russell <rusty@...tcorp.com.au> wrote: >> On Tue, 5 Oct 2010 11:15:21 pm Dave Young wrote: >>> Balloon could cause guest memory oom killing and panic. >>> >>> Add oom notify to leak some memory and retry fill balloon after 5 minutes. >> >> Have you tried registering a shrinker? See mm.h. > > Hi, thanks. I didn't know shrinker can shrink mem beyond slab. Will try Hi, rusty I did some test with shrinker, findings as following: 1. shrinker is for ageable cache shrinking, balloon pages is a different kind 2. oom notifier is a last minute shrink, but shrinker is more conservative. after my tests of "balloon 30" for a slackware 13.0 guest, free -m in guest oom notifier results 17M shrinker results 77M 3. Aside of above use mutex locking in shrinker cause kernel hang, no idea how to fix it > >> >> Thanks, >> Rusty. >> > > > > -- > Regards > dave > -- Regards dave -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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