From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from [140.186.70.92] (port=53663 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1OvYfY-0005LA-S8 for qemu-devel@nongnu.org; Tue, 14 Sep 2010 12:47:46 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.69) (envelope-from ) id 1OvYfX-00069a-EH for qemu-devel@nongnu.org; Tue, 14 Sep 2010 12:47:44 -0400 Received: from mx1.redhat.com ([209.132.183.28]:51537) by eggs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OvYfX-00069W-5J for qemu-devel@nongnu.org; Tue, 14 Sep 2010 12:47:43 -0400 Received: from int-mx03.intmail.prod.int.phx2.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.16]) by mx1.redhat.com (8.13.8/8.13.8) with ESMTP id o8EGlg9Q016813 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Tue, 14 Sep 2010 12:47:42 -0400 Received: from blackpad.lan.raisama.net (ovpn-113-84.phx2.redhat.com [10.3.113.84]) by int-mx03.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id o8EGlfBM023366 for ; Tue, 14 Sep 2010 12:47:42 -0400 From: Eduardo Habkost Date: Tue, 14 Sep 2010 13:47:40 -0300 Message-Id: <1284482860-4342-1-git-send-email-ehabkost@redhat.com> Subject: [Qemu-devel] [PATCH] [for 0.13] disable guest-provided stats on "info balloon" command List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Markus Armbruster , Luiz Capitulino , Adam Litke , Amit Shah , Paolo Bonzini The addition of memory stats reporting to the virtio balloon causes the 'info balloon' command to become asynchronous. This is a regression because in some cases it can hang the user monitor. This is an alternative to Adam Litke's patch. Adam's patch disabled the corresponding (guest-visible) virtio feature bit, causing issues for migration. Original discussion is available at: http://marc.info/?l=qemu-devel&m=128448124328314&w=2 Signed-off-by: Eduardo Habkost Acked-by: Adam Litke --- diff --git a/hw/virtio-balloon.c b/hw/virtio-balloon.c index 1e4dfdd..92e9057 100644 --- a/hw/virtio-balloon.c +++ b/hw/virtio-balloon.c @@ -30,6 +30,10 @@ #include #endif +/* Disable guest-provided stats by now (https://bugzilla.redhat.com/show_bug.cgi?id=623903) */ +#define ENABLE_GUEST_STATS 0 + + typedef struct VirtIOBalloon { VirtIODevice vdev; @@ -84,12 +88,14 @@ static QObject *get_stats_qobject(VirtIOBalloon *dev) VIRTIO_BALLOON_PFN_SHIFT); stat_put(dict, "actual", actual); +#if ENABLE_GUEST_STATS stat_put(dict, "mem_swapped_in", dev->stats[VIRTIO_BALLOON_S_SWAP_IN]); stat_put(dict, "mem_swapped_out", dev->stats[VIRTIO_BALLOON_S_SWAP_OUT]); stat_put(dict, "major_page_faults", dev->stats[VIRTIO_BALLOON_S_MAJFLT]); stat_put(dict, "minor_page_faults", dev->stats[VIRTIO_BALLOON_S_MINFLT]); stat_put(dict, "free_mem", dev->stats[VIRTIO_BALLOON_S_MEMFREE]); stat_put(dict, "total_mem", dev->stats[VIRTIO_BALLOON_S_MEMTOT]); +#endif return QOBJECT(dict); } @@ -215,7 +221,7 @@ static void virtio_balloon_to_target(void *opaque, ram_addr_t target, } dev->stats_callback = cb; dev->stats_opaque_callback_data = cb_data; - if (dev->vdev.guest_features & (1 << VIRTIO_BALLOON_F_STATS_VQ)) { + if (ENABLE_GUEST_STATS && (dev->vdev.guest_features & (1 << VIRTIO_BALLOON_F_STATS_VQ))) { virtqueue_push(dev->svq, &dev->stats_vq_elem, dev->stats_vq_offset); virtio_notify(&dev->vdev, dev->svq); } else {