From patchwork Wed Jul 27 01:23:31 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Liang Li X-Patchwork-Id: 9249161 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 990FB60757 for ; Wed, 27 Jul 2016 01:31:42 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8AC1A27AC2 for ; Wed, 27 Jul 2016 01:31:42 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7F2F627BF8; Wed, 27 Jul 2016 01:31:42 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 116AC27AC2 for ; Wed, 27 Jul 2016 01:31:41 +0000 (UTC) Received: from localhost ([::1]:43184 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bSDhC-00039y-TA for patchwork-qemu-devel@patchwork.kernel.org; Tue, 26 Jul 2016 21:31:38 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:49321) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bSDgg-00039n-0E for qemu-devel@nongnu.org; Tue, 26 Jul 2016 21:31:06 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bSDge-0001AG-4s for qemu-devel@nongnu.org; Tue, 26 Jul 2016 21:31:05 -0400 Received: from mga09.intel.com ([134.134.136.24]:47642) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bSDgd-000198-TG for qemu-devel@nongnu.org; Tue, 26 Jul 2016 21:31:04 -0400 Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by orsmga102.jf.intel.com with ESMTP; 26 Jul 2016 18:30:59 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.28,427,1464678000"; d="scan'208";a="146017899" Received: from ll.sh.intel.com (HELO localhost) ([10.239.13.123]) by fmsmga004.fm.intel.com with ESMTP; 26 Jul 2016 18:30:57 -0700 From: Liang Li To: linux-kernel@vger.kernel.org Date: Wed, 27 Jul 2016 09:23:31 +0800 Message-Id: <1469582616-5729-3-git-send-email-liang.z.li@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1469582616-5729-1-git-send-email-liang.z.li@intel.com> References: <1469582616-5729-1-git-send-email-liang.z.li@intel.com> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 134.134.136.24 Subject: [Qemu-devel] [PATCH v2 repost 2/7] virtio-balloon: define new feature bit and page bitmap head X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: virtio-dev@lists.oasis-open.org, kvm@vger.kernel.org, quintela@redhat.com, Amit Shah , Liang Li , qemu-devel@nongnu.org, dgilbert@redhat.com, linux-mm@kvack.org, "Michael S. Tsirkin" , Cornelia Huck , Paolo Bonzini , virtualization@lists.linux-foundation.org Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP 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 Cc: Michael S. Tsirkin Cc: Paolo Bonzini Cc: Cornelia Huck Cc: Amit Shah --- 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 */