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

2017-09-14 Thread Wei Wang 

On 09/12/2017 10:29 PM, Tomáš Golembiovský wrote:

On Tue, 29 Aug 2017 20:01:53 +0800
Wei Wang  wrote:


On 08/29/2017 05:57 PM, Stefan Hajnoczi wrote:

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?

Could you please share the usages of reclaimable memory via the stats?

I'll go ahead then and start sending patches. What would be the proper
course of action here? Send patch for the driver first, or send patch
for QEMU first or send both patches right away?


If you have both ready, I think it would be fine to send them all.






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?

   

One of the solutions that I'm thinking about is to make virtio
platform-ware.

This is not necessary. IIUC the driver does not need to send all the
stats. We can simply treat those stats as specific to Linux driver and
other drivers will not send them. Then QEMU will treat them as if zero
was reported.


Just had a quick check, I think that should function well too.
QEMU will report -1 for the stats.

Best,
Wei
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2017-09-14 Thread Mariana 
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RE: packed ring layout proposal v3

2017-09-14 Thread Ilya Lesokhin 
> -Original Message-
> From: virtualization-boun...@lists.linux-foundation.org
> [mailto:virtualization-boun...@lists.linux-foundation.org] On Behalf Of
> Michael S. Tsirkin
> Sent: Sunday, September 10, 2017 8:06 AM
> To: virtio-...@lists.oasis-open.org
> Cc: virtualization@lists.linux-foundation.org
> Subject: packed ring layout proposal v3
> 
> This is an update from v2 version.
...
> When driver descriptors are chained in this way, multiple descriptors are
> treated as a part of a single transaction containing an optional write buffer
> followed by an optional read buffer.
> All descriptors in the chain must have the same ID.
> 
...

I think you should consider removing  the "same ID" requirement.

Assuming out of order execution, how is the driver supposed to re-assign unique 
IDs to the previously
chained descriptor?
Do you expected driver to copy original IDs somewhere else before the chaining 
and then restore them after the chain is
executed?

Thanks,
Ilya


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