linux-kernel - Re: [PATCH v4 9/9] virtio-balloon: add workingset reporting

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Message-ID: <CAJj2-QHZvSKoErQq-oQoZLbDMuJwwdAQef-B5=WKQS9iUE+gTQ@mail.gmail.com>
Date: Wed, 27 Nov 2024 15:38:29 -0800
From: Yuanchu Xie <yuanchu@...gle.com>
To: Daniel Verkamp <dverkamp@...omium.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>, David Hildenbrand <david@...hat.com>, 
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>, Khalid Aziz <khalid.aziz@...cle.com>, 
	Henry Huang <henry.hj@...group.com>, Yu Zhao <yuzhao@...gle.com>, 
	Dan Williams <dan.j.williams@...el.com>, Gregory Price <gregory.price@...verge.com>, 
	Huang Ying <ying.huang@...el.com>, Lance Yang <ioworker0@...il.com>, 
	Randy Dunlap <rdunlap@...radead.org>, Muhammad Usama Anjum <usama.anjum@...labora.com>, 
	Tejun Heo <tj@...nel.org>, Johannes Weiner <hannes@...xchg.org>, Michal Koutný <mkoutny@...e.com>, 
	Jonathan Corbet <corbet@....net>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	"Rafael J. Wysocki" <rafael@...nel.org>, "Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>, 
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, Eugenio Pérez <eperezma@...hat.com>, 
	Michal Hocko <mhocko@...nel.org>, Roman Gushchin <roman.gushchin@...ux.dev>, 
	Shakeel Butt <shakeel.butt@...ux.dev>, Muchun Song <muchun.song@...ux.dev>, 
	Mike Rapoport <rppt@...nel.org>, Shuah Khan <shuah@...nel.org>, 
	Christian Brauner <brauner@...nel.org>, Daniel Watson <ozzloy@...h.do>, cgroups@...r.kernel.org, 
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, 
	virtualization@...ts.linux.dev, linux-mm@...ck.org, 
	linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v4 9/9] virtio-balloon: add workingset reporting

On Wed, Nov 27, 2024 at 3:15 PM Daniel Verkamp <dverkamp@...omium.org> wrote:
> >   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
> >   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
> >   * SUCH DAMAGE. */
> > +#include "linux/workingset_report.h"
> >  #include <linux/types.h>
> >  #include <linux/virtio_types.h>
> >  #include <linux/virtio_ids.h>
>
> This seems to be including a non-uapi header
> (include/linux/workingset_report.h) from a uapi header
> (include/uapi/linux/virtio_balloon.h), which won't compile outside the
> kernel. Does anything in the uapi actually need declarations from
> workingset_report.h?
Good point. I should move the relevant constants over.

> > +
> > +struct virtio_balloon_working_set_notify {
> > +       /* REQUEST or CONFIG */
> > +       __le16 op;
> > +       __le16 node_id;
> > +       /* the following fields valid iff op=CONFIG */
> > +       __le32 report_threshold;
> > +       __le32 refresh_interval;
> > +       __le32 idle_age[WORKINGSET_REPORT_MAX_NR_BINS];
> > +};
> > +
> > +struct virtio_balloon_working_set_report_bin {
> > +       __le64 idle_age;
> > +       /* bytes in this bucket for anon and file */
> > +       __le64 anon_bytes;
> > +       __le64 file_bytes;
> > +};
> > +
> > +struct virtio_balloon_working_set_report {
> > +       __le32 error;
> > +       __le32 node_id;
> > +       struct virtio_balloon_working_set_report_bin
> > +               bins[WORKINGSET_REPORT_MAX_NR_BINS];
> > +};
> > +
> >  #endif /* _LINUX_VIRTIO_BALLOON_H */
>
> Have the spec changes been discussed in the virtio TC?
They have not. Thanks for bringing this up. I'll post in the VIRTIO TC.

Thanks,
Yuanchu