From: Liang Li <liang.z.li@intel.com>
To: mst@redhat.com
Cc: linux-kernel@vger.kernel.org,
virtualization@lists.linux-foundation.org, kvm@vger.kernel.org,
qemu-devel@nongnu.org, virtio-dev@lists.oasis-open.org,
dgilbert@redhat.com, quintela@redhat.com,
Liang Li <liang.z.li@intel.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Cornelia Huck <cornelia.huck@de.ibm.com>,
Amit Shah <amit.shah@redhat.com>
Subject: [PATCH v2 kernel 2/7] virtio-balloon: define new feature bit and page bitmap head
Date: Wed, 29 Jun 2016 18:32:15 +0800 [thread overview]
Message-ID: <1467196340-22079-3-git-send-email-liang.z.li@intel.com> (raw)
In-Reply-To: <1467196340-22079-1-git-send-email-liang.z.li@intel.com>
Add a new feature which supports sending the page information with
a bitmap. The current implementation uses PFNs array, which is not
very efficient. Using bitmap can improve the performance of
inflating/deflating significantly
The page bitmap header will used to tell the host some information
about the page bitmap. e.g. the page size, page bitmap length and
start pfn.
Signed-off-by: Liang Li <liang.z.li@intel.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Amit Shah <amit.shah@redhat.com>
---
include/uapi/linux/virtio_balloon.h | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/include/uapi/linux/virtio_balloon.h b/include/uapi/linux/virtio_balloon.h
index 343d7dd..d3b182a 100644
--- a/include/uapi/linux/virtio_balloon.h
+++ b/include/uapi/linux/virtio_balloon.h
@@ -34,6 +34,7 @@
#define VIRTIO_BALLOON_F_MUST_TELL_HOST 0 /* Tell before reclaiming pages */
#define VIRTIO_BALLOON_F_STATS_VQ 1 /* Memory Stats virtqueue */
#define VIRTIO_BALLOON_F_DEFLATE_ON_OOM 2 /* Deflate balloon on OOM */
+#define VIRTIO_BALLOON_F_PAGE_BITMAP 3 /* Send page info with bitmap */
/* Size of a PFN in the balloon interface. */
#define VIRTIO_BALLOON_PFN_SHIFT 12
@@ -82,4 +83,22 @@ struct virtio_balloon_stat {
__virtio64 val;
} __attribute__((packed));
+/* Page bitmap header structure */
+struct balloon_bmap_hdr {
+ /* Used to distinguish different request */
+ __virtio16 cmd;
+ /* Shift width of page in the bitmap */
+ __virtio16 page_shift;
+ /* flag used to identify different status */
+ __virtio16 flag;
+ /* Reserved */
+ __virtio16 reserved;
+ /* ID of the request */
+ __virtio64 req_id;
+ /* The pfn of 0 bit in the bitmap */
+ __virtio64 start_pfn;
+ /* The length of the bitmap, in bytes */
+ __virtio64 bmap_len;
+};
+
#endif /* _LINUX_VIRTIO_BALLOON_H */
--
1.8.3.1
next prev parent reply other threads:[~2016-06-29 10:40 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-29 10:32 [PATCH v2 kernel 0/7] Extend virtio-balloon for fast (de)inflating & fast live migration Liang Li
2016-06-29 10:32 ` [PATCH v2 kernel 1/7] virtio-balloon: rework deflate to add page to a list Liang Li
2016-06-29 10:32 ` Liang Li [this message]
2016-06-29 10:32 ` [PATCH v2 kernel 3/7] mm: add a function to get the max pfn Liang Li
2016-06-29 10:32 ` [PATCH v2 kernel 4/7] virtio-balloon: speed up inflate/deflate process Liang Li
2016-06-29 10:32 ` [PATCH v2 kernel 5/7] virtio-balloon: define feature bit and head for misc virt queue Liang Li
2016-06-29 10:32 ` [PATCH v2 kernel 6/7] mm: add the related functions to get free page info Liang Li
2016-06-29 10:32 ` [PATCH v2 kernel 7/7] virtio-balloon: tell host vm's " Liang Li
2016-07-06 0:43 ` [PATCH v2 kernel 0/7] Extend virtio-balloon for fast (de)inflating & fast live migration Li, Liang Z
2016-07-21 8:14 ` Li, Liang Z
2016-07-26 18:55 ` Michael S. Tsirkin
2016-07-27 1:32 ` [virtio-dev] " Li, Liang Z
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