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Re: [Xen-users] How to know if the balloon driver is running
Hi Ian,
So
let me see if I understand you correctly. If the CONFIG_XEN_BALLOON
is enabled (as in my case),
root@xxxx#
grep CONFIG_XEN_BALLOON
/boot/config-3.8.0-35-generic
CONFIG_XEN_BALLOON=y
CONFIG_XEN_BALLOON_MEMORY_HOTPLUG=y
then the balloon
driver is automatically started at boot time by the
domU.
Finally, regarding
the files in /sys/devices/system/xen_memory/xen_memory0/selfballoon
(inside the domU), are they used by the balloon driver
or the selfballoon daemon?
Thanks
Alain
> On Thu,
2014-01-23 at 09:11 +0100, napster wrote:
> > But
there is some files in the /sys file system which refers to
the
> >
selfballooning. Does that mean that the balloon driver is
running? If
> > it is
the case, how is about /proc/xen/balloon? Else, how to
activate
> > the
balloon driver?
> IIRC
the core balloon driver is always present when Xen is enabled
and
> so
the kernel will respond to requests from the host/toolstack to
change
> the
amount of RAM (e.g "xm/xl mem-set foo" in dom0, which would
result
> in
changes to /proc/meminfo).
> In
order to get in-guest access to control ballooning you need to
> CONFIG_XEN_BALLOON
enable and load the xen-balloon.ko module. I'm not
> sure
but I think with modern kernels this will appear in /sys and
> not
/proc.
> It
seems like the docs might be out of date and/or incomplete here.
If
> you
would be so kind as to produce a docs patch against xen.git (see
[0]
> for
tips) or create/update a page on the wiki once you've figured
this
> out
then we would be very grateful -- conveniently there is a
document
> day[1]
on Monday.
> The
selfballoon stuff is a separate thing (although related), it's
> something
to do with tmem AFAIUI.
> Ian.
> [0]
http://wiki.xen.org/wiki/Submitting_Xen_Patches
> [1]
http://wiki.xen.org/wiki/Xen_Document_Days
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