From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:36482) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UN96R-0006w6-5o for qemu-devel@nongnu.org; Tue, 02 Apr 2013 17:50:55 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UN96M-0008SX-SX for qemu-devel@nongnu.org; Tue, 02 Apr 2013 17:50:51 -0400 Sender: fluxion From: Michael Roth Date: Tue, 2 Apr 2013 16:45:11 -0500 Message-Id: <1364939142-30066-7-git-send-email-mdroth@linux.vnet.ibm.com> In-Reply-To: <1364939142-30066-1-git-send-email-mdroth@linux.vnet.ibm.com> References: <1364939142-30066-1-git-send-email-mdroth@linux.vnet.ibm.com> Subject: [Qemu-devel] [PATCH 06/37] net: reduce the unnecessary memory allocation of multiqueue List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: qemu-stable@nongnu.org From: Jason Wang Edivaldo reports a problem that the array of NetClientState in NICState is too large - MAX_QUEUE_NUM(1024) which will wastes memory even if multiqueue is not used. Instead of static arrays, solving this issue by allocating the queues on demand for both the NetClientState array in NICState and VirtIONetQueue array in VirtIONet. Tested by myself, with single virtio-net-pci device. The memory allocation is almost the same as when multiqueue is not merged. Cc: Edivaldo de Araujo Pereira Cc: qemu-stable@nongnu.org Signed-off-by: Jason Wang Signed-off-by: Stefan Hajnoczi (cherry picked from commit f6b26cf257232e5854c0e5c98a8685c625bf986e) Signed-off-by: Michael Roth --- hw/virtio-net.c | 6 ++++-- include/net/net.h | 2 +- net/net.c | 19 +++++++++---------- 3 files changed, 14 insertions(+), 13 deletions(-) diff --git a/hw/virtio-net.c b/hw/virtio-net.c index 573c669..bb2c26c 100644 --- a/hw/virtio-net.c +++ b/hw/virtio-net.c @@ -44,7 +44,7 @@ typedef struct VirtIONet VirtIODevice vdev; uint8_t mac[ETH_ALEN]; uint16_t status; - VirtIONetQueue vqs[MAX_QUEUE_NUM]; + VirtIONetQueue *vqs; VirtQueue *ctrl_vq; NICState *nic; uint32_t tx_timeout; @@ -1326,8 +1326,9 @@ VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf, n->vdev.set_status = virtio_net_set_status; n->vdev.guest_notifier_mask = virtio_net_guest_notifier_mask; n->vdev.guest_notifier_pending = virtio_net_guest_notifier_pending; + n->max_queues = MAX(conf->queues, 1); + n->vqs = g_malloc0(sizeof(VirtIONetQueue) * n->max_queues); n->vqs[0].rx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_rx); - n->max_queues = conf->queues; n->curr_queues = 1; n->vqs[0].n = n; n->tx_timeout = net->txtimer; @@ -1412,6 +1413,7 @@ void virtio_net_exit(VirtIODevice *vdev) } } + g_free(n->vqs); qemu_del_nic(n->nic); virtio_cleanup(&n->vdev); } diff --git a/include/net/net.h b/include/net/net.h index 43a045e..cb049a1 100644 --- a/include/net/net.h +++ b/include/net/net.h @@ -72,7 +72,7 @@ struct NetClientState { }; typedef struct NICState { - NetClientState ncs[MAX_QUEUE_NUM]; + NetClientState *ncs; NICConf *conf; void *opaque; bool peer_deleted; diff --git a/net/net.c b/net/net.c index be03a8d..6262ed0 100644 --- a/net/net.c +++ b/net/net.c @@ -235,23 +235,20 @@ NICState *qemu_new_nic(NetClientInfo *info, const char *name, void *opaque) { - NetClientState *nc; NetClientState **peers = conf->peers.ncs; NICState *nic; - int i; + int i, queues = MAX(1, conf->queues); assert(info->type == NET_CLIENT_OPTIONS_KIND_NIC); assert(info->size >= sizeof(NICState)); - nc = qemu_new_net_client(info, peers[0], model, name); - nc->queue_index = 0; - - nic = qemu_get_nic(nc); + nic = g_malloc0(info->size + sizeof(NetClientState) * queues); + nic->ncs = (void *)nic + info->size; nic->conf = conf; nic->opaque = opaque; - for (i = 1; i < conf->queues; i++) { - qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, nc->name, + for (i = 0; i < queues; i++) { + qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name, NULL); nic->ncs[i].queue_index = i; } @@ -261,7 +258,7 @@ NICState *qemu_new_nic(NetClientInfo *info, NetClientState *qemu_get_subqueue(NICState *nic, int queue_index) { - return &nic->ncs[queue_index]; + return nic->ncs + queue_index; } NetClientState *qemu_get_queue(NICState *nic) @@ -273,7 +270,7 @@ NICState *qemu_get_nic(NetClientState *nc) { NetClientState *nc0 = nc - nc->queue_index; - return DO_UPCAST(NICState, ncs[0], nc0); + return (NICState *)((void *)nc0 - nc->info->size); } void *qemu_get_nic_opaque(NetClientState *nc) @@ -368,6 +365,8 @@ void qemu_del_nic(NICState *nic) qemu_cleanup_net_client(nc); qemu_free_net_client(nc); } + + g_free(nic); } void qemu_foreach_nic(qemu_nic_foreach func, void *opaque) -- 1.7.9.5