Re: [Xen-users] How to know if the balloon driver is running

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

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It seems like the docs might be out of date and/or incomplete here.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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