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Subject: Re: [PATCH v26 2/2 RESEND] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT
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@intel.com> Signed-off-by: Liang Li <liang.z.li@intel.com> Cc: Michael S. Tsirkin <mst@redhat.com> Cc: Michal Hocko <mhocko@kernel.org> --- 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 modulesRESEND 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
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