Re: [Qemu-devel] [RFC] Buffers/caches in VirtIO Balloon driver stats

[Stefan Hajnoczi]

On Sun, Aug 27, 2017 at 11:30:33PM +0200, Tomáš Golembiovský wrote:
> Hi,

I have CCed the relevant mailing lists and people most recently involved
in virtio-balloon discussions.  Hopefully this will help get the right
people to see your questions.

> We'd like to include information about reclaimable memory into the
> statistics in VirtiO Balloon driver. Namely, we'd like to include
> counters for bufferes and caches of Linux kernel. The patch itself is
> pretty trivial -- no problem there. But before we do that I'd like to
> get some input from the QEMU community.
> 
> 1) Is there any reason not to have the stats there?
> 
> 2) Considering the balloon device is multiplatform (Linux, BSD,
> Windows), is there a problem with including buffers/caches? These seem
> to be specific to the Linux virtual memory subsystem. Of course, other
> OSes could just report zeros. Are there some internal stats on those
> OSes that could be filled in? I don't now if such or similar statistic
> are available on BSD. On Windows only SystemCache stat looks like
> something relevant. Anyone familiar with those OSes has any suggestions?
> 
>     Tomas
> 
> -- 
> Tomáš Golembiovský <address@hidden>
>