Re: [virtio-dev] [PATCH] content: document balloon memory statistics

["Tomáš Golembiovský" <tgolembi@redhat.com>]

On Tue, 27 Feb 2018 21:56:04 +0200
"Michael S. Tsirkin" <mst@redhat.com> wrote:

> On Wed, Feb 21, 2018 at 06:44:17PM +0100, Tomáš Golembiovský wrote:
> > On Wed, 21 Feb 2018 11:33:28 +0000
> > Stefan Hajnoczi <stefanha@redhat.com> wrote:
> >   
> > > On Wed, Feb 21, 2018 at 12:11:35AM +0100, Tomáš Golembiovský wrote:  
> > > > On Tue, 20 Feb 2018 17:15:44 +0000
> > > > Stefan Hajnoczi <stefanha@redhat.com> wrote:
> > > >   
> > > > > On Mon, Feb 19, 2018 at 02:10:29PM +0100, Tomáš Golembiovský wrote:  
> > > > > > +\item[VIRTIO_BALLOON_S_CACHES (7)] The amount of memory currently used for
> > > > > > +  caching files and other data from disk (in bytes).
> > > > > >  \end{description}    
> > > > > 
> > > > > This one is somewhat vague.  I'm not sure if it means guest page cache
> > > > > specifically or something more general.
> > > > > 
> > > > > On the other hand, the numbers tend to be OS specific...  
> > > > 
> > > > We should come up with a definition that is as definite as possible
> > > > while leaving room for all systems to substitute a value that is
> > > > natively available. So if anyone has a better formulation then please
> > > > advise. The original intent was not to create a Linux specific field.
> > > > 
> > > > On Linux the value corresponds to Buffers + Cached + SwapCached memory
> > > > stats. Correct me if I'm wrong but that should be all clean pages that
> > > > have a counterpart on disk and can be quickly reclaimed and used for
> > > > something else (without additional IO).  
> > > 
> > > Thanks for clarifying.  Based on what you posted, how about:
> > > 
> > > "The amount of memory, in bytes, that can be quickly reclaimed without
> > > additional I/O.  Typically these pages are used for caching files from
> > > disk."
> > > 
> > > ?  
> > 
> > Sounds reasonable, thanks
> > 
> >     Tomas  
> 
> OK - will you post v2 then?

I already have:
https://lists.oasis-open.org/archives/virtio-dev/201802/msg00141.html

> 
> >   
> > >   
> > > > On Windows this roughly corresponds to the standby list. Or maybe
> > > > standby list plus something else. I suppose there may be some
> > > > alternative on BSD too.
> > > > 
> > > >     Tomas
> > > > 
> > > > 
> > > > -- 
> > > > Tomáš Golembiovský <tgolembi@redhat.com>  
> > 
> > 
> > -- 
> > Tomáš Golembiovský <tgolembi@redhat.com>  


-- 
Tomáš Golembiovský <tgolembi@redhat.com>

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