search for: stats_vq

...vers/virtio/virtio_balloon.c index 200c22f..f4c8cd8 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -29,7 +29,7 @@ struct virtio_balloon { struct virtio_device *vdev; - struct virtqueue *inflate_vq, *deflate_vq; + struct virtqueue *inflate_vq, *deflate_vq, *stats_vq; /* Where the ballooning thread waits for config to change. */ wait_queue_head_t config_change; @@ -50,6 +50,9 @@ struct virtio_balloon /* The array of pfns we tell the Host about. */ unsigned int num_pfns; u32 pfns[256]; + + /* Memory statistics */ + struct virtio_balloon_stat stats[VI...

...vers/virtio/virtio_balloon.c index 200c22f..f4c8cd8 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -29,7 +29,7 @@ struct virtio_balloon { struct virtio_device *vdev; - struct virtqueue *inflate_vq, *deflate_vq; + struct virtqueue *inflate_vq, *deflate_vq, *stats_vq; /* Where the ballooning thread waits for config to change. */ wait_queue_head_t config_change; @@ -50,6 +50,9 @@ struct virtio_balloon /* The array of pfns we tell the Host about. */ unsigned int num_pfns; u32 pfns[256]; + + /* Memory statistics */ + struct virtio_balloon_stat stats[VI...

...index a1fb52c..b9561a5 100644 > --- a/drivers/virtio/virtio_balloon.c > +++ b/drivers/virtio/virtio_balloon.c > @@ -53,7 +53,12 @@ static struct vfsmount *balloon_mnt; > > struct virtio_balloon { > struct virtio_device *vdev; > - struct virtqueue *inflate_vq, *deflate_vq, *stats_vq; > + struct virtqueue *inflate_vq, *deflate_vq, *stats_vq, *free_page_vq; > + > + /* Balloon's own wq for cpu-intensive work items */ > + struct workqueue_struct *balloon_wq; > + /* The free page reporting work item submitted to the balloon wq */ > + struct work_struct report_...

...index a1fb52c..b9561a5 100644 > --- a/drivers/virtio/virtio_balloon.c > +++ b/drivers/virtio/virtio_balloon.c > @@ -53,7 +53,12 @@ static struct vfsmount *balloon_mnt; > > struct virtio_balloon { > struct virtio_device *vdev; > - struct virtqueue *inflate_vq, *deflate_vq, *stats_vq; > + struct virtqueue *inflate_vq, *deflate_vq, *stats_vq, *free_page_vq; > + > + /* Balloon's own wq for cpu-intensive work items */ > + struct workqueue_struct *balloon_wq; > + /* The free page reporting work item submitted to the balloon wq */ > + struct work_struct report_...

...vers/virtio/virtio_balloon.c index 200c22f..ebc9d39 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -29,7 +29,7 @@ struct virtio_balloon { struct virtio_device *vdev; - struct virtqueue *inflate_vq, *deflate_vq; + struct virtqueue *inflate_vq, *deflate_vq, *stats_vq; /* Where the ballooning thread waits for config to change. */ wait_queue_head_t config_change; @@ -50,6 +50,9 @@ struct virtio_balloon /* The array of pfns we tell the Host about. */ unsigned int num_pfns; u32 pfns[256]; + + /* Memory statistics */ + struct virtio_balloon_stat stats[VI...

...vers/virtio/virtio_balloon.c index 200c22f..ebc9d39 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -29,7 +29,7 @@ struct virtio_balloon { struct virtio_device *vdev; - struct virtqueue *inflate_vq, *deflate_vq; + struct virtqueue *inflate_vq, *deflate_vq, *stats_vq; /* Where the ballooning thread waits for config to change. */ wait_queue_head_t config_change; @@ -50,6 +50,9 @@ struct virtio_balloon /* The array of pfns we tell the Host about. */ unsigned int num_pfns; u32 pfns[256]; + + /* Memory statistics */ + struct virtio_balloon_stat stats[VI...

...index a1fb52c..b9561a5 100644 > --- a/drivers/virtio/virtio_balloon.c > +++ b/drivers/virtio/virtio_balloon.c > @@ -53,7 +53,12 @@ static struct vfsmount *balloon_mnt; > > struct virtio_balloon { > struct virtio_device *vdev; > - struct virtqueue *inflate_vq, *deflate_vq, *stats_vq; > + struct virtqueue *inflate_vq, *deflate_vq, *stats_vq, *free_page_vq; > + > + /* Balloon's own wq for cpu-intensive work items */ > + struct workqueue_struct *balloon_wq; > + /* The free page reporting work item submitted to the balloon wq */ > + struct work_struct report_...

...index a1fb52c..b9561a5 100644 > --- a/drivers/virtio/virtio_balloon.c > +++ b/drivers/virtio/virtio_balloon.c > @@ -53,7 +53,12 @@ static struct vfsmount *balloon_mnt; > > struct virtio_balloon { > struct virtio_device *vdev; > - struct virtqueue *inflate_vq, *deflate_vq, *stats_vq; > + struct virtqueue *inflate_vq, *deflate_vq, *stats_vq, *free_page_vq; > + > + /* Balloon's own wq for cpu-intensive work items */ > + struct workqueue_struct *balloon_wq; > + /* The free page reporting work item submitted to the balloon wq */ > + struct work_struct report_...

...oon.c b/drivers/virtio/virtio_balloon.c index 4e11915..d34f56f 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -423,12 +423,16 @@ static int init_vqs(struct virtio_balloon *vb) vb->deflate_vq = vqs[1]; if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_STATS_VQ)) { struct scatterlist sg; + int idx; vb->stats_vq = vqs[2]; /* * Prime this virtqueue with one buffer so the hypervisor can * use it to signal us later (it can't be broken yet!). */ + for (idx = 0; idx < VIRTIO_BALLOON_S_NR; idx++) + update_stat(vb, idx, U16_MA...

...oon.c b/drivers/virtio/virtio_balloon.c index 4e11915..d34f56f 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -423,12 +423,16 @@ static int init_vqs(struct virtio_balloon *vb) vb->deflate_vq = vqs[1]; if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_STATS_VQ)) { struct scatterlist sg; + int idx; vb->stats_vq = vqs[2]; /* * Prime this virtqueue with one buffer so the hypervisor can * use it to signal us later (it can't be broken yet!). */ + for (idx = 0; idx < VIRTIO_BALLOON_S_NR; idx++) + update_stat(vb, idx, U16_MA...

...e: > Add a new vq, cmdq, to handle requests between the device and driver. > > This patch implements two commands sent from the device and handled in > the driver. > 1) VIRTIO_BALLOON_CMDQ_REPORT_STATS: this command is used to report > the guest memory statistics to the host. The stats_vq mechanism is not > used when the cmdq mechanism is enabled. > 2) VIRTIO_BALLOON_CMDQ_REPORT_UNUSED_PAGES: this command is used to > report the guest unused pages to the host. > > Since now we have a vq to handle multiple commands, we need to keep only > one vq operation at a time...

...e: > Add a new vq, cmdq, to handle requests between the device and driver. > > This patch implements two commands sent from the device and handled in > the driver. > 1) VIRTIO_BALLOON_CMDQ_REPORT_STATS: this command is used to report > the guest memory statistics to the host. The stats_vq mechanism is not > used when the cmdq mechanism is enabled. > 2) VIRTIO_BALLOON_CMDQ_REPORT_UNUSED_PAGES: this command is used to > report the guest unused pages to the host. > > Since now we have a vq to handle multiple commands, we need to keep only > one vq operation at a time...

...*/ +#define VIRTIO_BALLOON_VQ_NUM 4 +#define VIRTIO_BALLOON_VQ_ID_INFLATE 0 +#define VIRTIO_BALLOON_VQ_ID_DEFLATE 1 +#define VIRTIO_BALLOON_VQ_ID_STATS 2 +#define VIRTIO_BALLOON_VQ_ID_FREE_PAGE 3 + struct virtio_balloon { struct virtio_device *vdev; - struct virtqueue *inflate_vq, *deflate_vq, *stats_vq; + struct virtqueue *inflate_vq, *deflate_vq, *stats_vq, *free_page_vq; + + /* Balloon's own wq for cpu-intensive work items */ + struct workqueue_struct *balloon_wq; + /* The free page reporting work item submitted to the balloon wq */ + struct work_struct report_free_page_work; /* The bal...

This patch series is separated from the previous "Virtio-balloon Enhancement" series. The new feature, VIRTIO_BALLOON_F_FREE_PAGE_VQ, implemented by this series enables the virtio-balloon driver to report hints of guest free pages to the host. It can be used to accelerate live migration of VMs. Here is an introduction of this usage: Live migration needs to transfer the VM's memory

...pport or accept one of the higher-numbered features while not supporting a lower-numbered one. Notably, there is no mention of queue index assignments changing based on negotiated features in either of these sections. Hence a reader can only assume that the queue index assignments are fixed (i.e. stats_vq will always be vq index 4 if F_STATS_VQ is negotiated, regardless of any other feature bits). Now consider a scenario where VIRTIO_BALLOON_F_STATS_VQ and VIRTIO_BALLOON_F_PAGE_REPORTING are negotiated but VIRTIO_BALLOON_F_FREE_PAGE_HINT is not (perhaps the device supports all of the defined featur...

...nt *balloon_mnt; #endif +enum virtio_balloon_vq { + VIRTIO_BALLOON_VQ_INFLATE, + VIRTIO_BALLOON_VQ_DEFLATE, + VIRTIO_BALLOON_VQ_STATS, + VIRTIO_BALLOON_VQ_FREE_PAGE, + VIRTIO_BALLOON_VQ_MAX +}; + struct virtio_balloon { struct virtio_device *vdev; - struct virtqueue *inflate_vq, *deflate_vq, *stats_vq; + struct virtqueue *inflate_vq, *deflate_vq, *stats_vq, *free_page_vq; + + /* Balloon's own wq for cpu-intensive work items */ + struct workqueue_struct *balloon_wq; + /* The free page reporting work item submitted to the balloon wq */ + struct work_struct report_free_page_work; /* The bal...

...b/drivers/virtio/virtio_balloon.c index 29aca0c..29c4a61 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -54,11 +54,12 @@ static struct vfsmount *balloon_mnt; struct virtio_balloon { struct virtio_device *vdev; - struct virtqueue *inflate_vq, *deflate_vq, *stats_vq; + struct virtqueue *inflate_vq, *deflate_vq, *stats_vq, *free_page_vq; /* The balloon servicing is delegated to a freezable workqueue. */ struct work_struct update_balloon_stats_work; struct work_struct update_balloon_size_work; + struct work_struct report_free_page_work; /* Prevent up...

Add a new vq, cmdq, to handle requests between the device and driver. This patch implements two commands send from the device and handled in the driver. 1) cmd VIRTIO_BALLOON_CMDQ_REPORT_STATS: this command is used to report the guest memory statistics to the host. The stats_vq mechanism is not used when the cmdq mechanism is enabled. 2) cmd VIRTIO_BALLOON_CMDQ_REPORT_UNUSED_PAGES: this command is used to report the guest unused pages to the host. Signed-off-by: Wei Wang <wei.w.wang at intel.com> --- drivers/virtio/virtio_balloon.c | 363 ++++++++++++++++++++++...

...vers/virtio/virtio_balloon.c index 200c22f..59b9533 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -29,7 +29,7 @@ struct virtio_balloon { struct virtio_device *vdev; - struct virtqueue *inflate_vq, *deflate_vq; + struct virtqueue *inflate_vq, *deflate_vq, *stats_vq; /* Where the ballooning thread waits for config to change. */ wait_queue_head_t config_change; @@ -50,6 +50,9 @@ struct virtio_balloon /* The array of pfns we tell the Host about. */ unsigned int num_pfns; u32 pfns[256]; + + /* Memory statistics */ + struct virtio_balloon_stat stats[VI...

...vers/virtio/virtio_balloon.c index 200c22f..59b9533 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -29,7 +29,7 @@ struct virtio_balloon { struct virtio_device *vdev; - struct virtqueue *inflate_vq, *deflate_vq; + struct virtqueue *inflate_vq, *deflate_vq, *stats_vq; /* Where the ballooning thread waits for config to change. */ wait_queue_head_t config_change; @@ -50,6 +50,9 @@ struct virtio_balloon /* The array of pfns we tell the Host about. */ unsigned int num_pfns; u32 pfns[256]; + + /* Memory statistics */ + struct virtio_balloon_stat stats[VI...