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Subject: Re: [virtio-dev] [PATCH v8 1/3] content: Document balloon feature free page hints
On 25.08.20 16:45, Alexander Duyck wrote: > From: Alexander Duyck <alexander.h.duyck@linux.intel.com> > > Free page hints allow the balloon driver to provide information on what > pages are not currently in use so that we can avoid the cost of copying > them in migration scenarios. Add a feature description for free page hints > describing basic functioning and requirements. > > Acked-by: Cornelia Huck <cohuck@redhat.com> > Reviewed-by: David Hildenbrand <david@redhat.com> > Signed-off-by: Alexander Duyck <alexander.h.duyck@linux.intel.com> > --- > conformance.tex | 2 + > content.tex | 161 +++++++++++++++++++++++++++++++++++++++++++++++++++++-- > 2 files changed, 157 insertions(+), 6 deletions(-) > > diff --git a/conformance.tex b/conformance.tex > index b6fdec090383..a14e26edfcb2 100644 > --- a/conformance.tex > +++ b/conformance.tex > @@ -149,6 +149,7 @@ \section{Conformance Targets}\label{sec:Conformance / Conformance Targets} > \item \ref{drivernormative:Device Types / Memory Balloon Device / Feature bits} > \item \ref{drivernormative:Device Types / Memory Balloon Device / Device Operation} > \item \ref{drivernormative:Device Types / Memory Balloon Device / Device Operation / Memory Statistics} > +\item \ref{drivernormative:Device Types / Memory Balloon Device / Device Operation / Free Page Hinting} > \end{itemize} > > \conformance{\subsection}{SCSI Host Driver Conformance}\label{sec:Conformance / Driver Conformance / SCSI Host Driver Conformance} > @@ -331,6 +332,7 @@ \section{Conformance Targets}\label{sec:Conformance / Conformance Targets} > \item \ref{devicenormative:Device Types / Memory Balloon Device / Feature bits} > \item \ref{devicenormative:Device Types / Memory Balloon Device / Device Operation} > \item \ref{devicenormative:Device Types / Memory Balloon Device / Device Operation / Memory Statistics} > +\item \ref{devicenormative:Device Types / Memory Balloon Device / Device Operation / Free Page Hinting} > \end{itemize} > > \conformance{\subsection}{SCSI Host Device Conformance}\label{sec:Conformance / Device Conformance / SCSI Host Device Conformance} > diff --git a/content.tex b/content.tex > index 91735e3eb018..76dfce919b97 100644 > --- a/content.tex > +++ b/content.tex > @@ -5005,10 +5005,13 @@ \subsection{Virtqueues}\label{sec:Device Types / Memory Balloon Device / Virtque > \begin{description} > \item[0] inflateq > \item[1] deflateq > -\item[2] statsq. > +\item[2] statsq > +\item[3] free_page_vq > \end{description} > > - Virtqueue 2 only exists if VIRTIO_BALLOON_F_STATS_VQ set. > + statsq only exists if VIRTIO_BALLOON_F_STATS_VQ is set. > + > + free_page_vq only exists if VIRTIO_BALLOON_F_FREE_PAGE_HINT is set. > > \subsection{Feature bits}\label{sec:Device Types / Memory Balloon Device / Feature bits} > \begin{description} > @@ -5019,6 +5022,10 @@ \subsection{Feature bits}\label{sec:Device Types / Memory Balloon Device / Featu > memory statistics is present. > \item[VIRTIO_BALLOON_F_DEFLATE_ON_OOM (2) ] Deflate balloon on > guest out of memory condition. > +\item[ VIRTIO_BALLOON_F_FREE_PAGE_HINT(3) ] The device has support for free > + page hinting. A virtqueue for providing hints as to what memory is > + currently free is present. Configuration field \field{free_page_hint_cmd_id} > + is valid. > > \end{description} > > @@ -5042,13 +5049,17 @@ \subsection{Feature bits}\label{sec:Device Types / Memory Balloon Device / Featu > VIRTIO_BALLOON_F_MUST_TELL_HOST is not negotiated. > > \subsection{Device configuration layout}\label{sec:Device Types / Memory Balloon Device / Device configuration layout} > - Both fields of this configuration > - are always available. > + \field{num_pages} and \field{actual} are always available. > + > + \field{free_page_hint_cmd_id} is available if > + VIRTIO_BALLOON_F_FREE_PAGE_HINT has been negotiated and is read-only by > + the driver. This reads at least to me like "...if VIRTIO_BALLOON_F_FREE_PAGE_HINT ... is read-only by the driver". I suspect you rather meant "free_page_hint_cmd_id is read-only...". Maybe split up into two sentences? Jan -- Siemens AG, Corporate Technology, CT RDA IOT SES-DE Corporate Competence Center Embedded Linux
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