Hi Eric, On 6 July 2010 22:43, Eric Haszlakiewicz <e...@nimenees.com> wrote: > On Tue, Jul 06, 2010 at 09:19:57AM +0530, Cherry G. Mathew wrote: >> On 28 June 2009 19:56, Cherry G. Mathew <cherry.g.mat...@gmail.com> wrote: >> > Hi, >> > >> > Quick note to say that I hacked up a little balloon driver from >> > scratch for fun. It just about works on a XEN3 dom0 but that's it. I'm >> > posting it here as an FYI as suggested by jym@ >> >> jym@ and I made a few more changes to this. >> Have a look here: >> ftp://ftp.netbsd.org/pub/NetBSD/misc/cherry/balloon/ >> >> Any feedback would be much appreciated. If things go well, I'm hoping >> to commit this marked "EXPERIMENTAL" "soon". > > A little more verbose comment in the source to explain how this is actually > used might be nice. Is there a man page? > > I'm guessing this is to implement ballooning as described at: > http://www.usenix.org/events/osdi02/tech/waldspurger/waldspurger_html/node6.html
That's correct, although this is obviously a Xen specific implementation. I'll get around to writing a man page for this soon enough. This is still experimental, and I don't have any benchmark results. Briefly, there are two methods to play with this now. >From dom0: # xm mem-set $domid $newmemsz or, from within the domU # sysctl -w kern.xen.balloon.target=$newtargetinpages kern.xen.balloon.current gives you the current total memory page reservation of the domU. Both are equivalent, however, using the sysctl does not reflect in the dom0 when you use # xm list I hope this helps. Cheers, -- ~Cherry
