On 02/07/2018 12:34 PM, Michael S. Tsirkin wrote:
On Wed, Feb 07, 2018 at 11:01:06AM +0800, Wei Wang wrote:
Negotiation of the VIRTIO_BALLOON_F_FREE_PAGE_HINT feature indicates the
support of reporting hints of guest free pages to host via virtio-balloon.
Host requests the guest to report free page hints by sending a new cmd
id to the guest via the free_page_report_cmd_id configuration register.
When the guest starts to report, the first element added to the free page
vq is the cmd id given by host. When the guest finishes the reporting
of all the free pages, VIRTIO_BALLOON_FREE_PAGE_REPORT_STOP_ID is added
to the vq to tell host that the reporting is done. Host polls the free
page vq after sending the starting cmd id, so the guest doesn't need to
kick after filling an element to the vq.
Host may also requests the guest to stop the reporting in advance by
sending the stop cmd id to the guest via the configuration register.
Signed-off-by: Wei Wang <wei.w.wang@xxxxxxxxx>
Signed-off-by: Liang Li <liang.z.li@xxxxxxxxx>
Cc: Michael S. Tsirkin <mst@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
---
drivers/virtio/virtio_balloon.c | 255 +++++++++++++++++++++++++++++++-----
include/uapi/linux/virtio_balloon.h | 7 +
mm/page_poison.c | 6 +
3 files changed, 232 insertions(+), 36 deletions(-)
Resend Change:
- Expose page_poisoning_enabled to kernel modules
RESEND tag is for reposting unchanged patches.
you want to post a v27, and you want the mm patch
as a separate one, so you can get an ack on it from
someone on linux-mm.
In fact, I would probably add reporting the poison value as
a separate feature/couple of patches.
OK. I have made them separate patches in v27. Thanks a lot for reviewing
so many versions, I learned a lot from the comments and discussion.
Best,
Wei
