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From 59bdfd752c491ce0e7253d78e379b0bd8c5cd00e Mon Sep 17 00:00:00 2001
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From: "Daniel P. Berrange" <berrange@redhat.com>
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Date: Thu, 8 Feb 2018 17:50:18 +0100
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Subject: [PATCH 04/27] vnc: return directly if no vnc client connected
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RH-Author: Daniel P. Berrange <berrange@redhat.com>
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Message-id: <20180208175041.5634-5-berrange@redhat.com>
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Patchwork-id: 78950
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O-Subject: [RHEL-7.5 qemu-kvm PATCH v1 04/27] vnc: return directly if no vnc client connected
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Bugzilla: 1527405
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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RH-Acked-by: Gerd Hoffmann <kraxel@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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From: ChenLiang <chenliang88@huawei.com>
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graphic_hw_update and vnc_refresh_server_surface aren't
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need to do when no vnc client connected. It can reduce
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lock contention, because vnc_refresh will hold global big
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lock two millisecond every three seconds.
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Signed-off-by: ChenLiang <chenliang88@huawei.com>
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Signed-off-by: Gonglei <arei.gonglei@huawei.com>
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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(cherry picked from commit 9d6b20704734fe1ab789400806ebd54f579d50a2)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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ui/vnc.c | 10 +++++-----
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1 file changed, 5 insertions(+), 5 deletions(-)
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diff --git a/ui/vnc.c b/ui/vnc.c
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index 42070b4..9047862 100644
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--- a/ui/vnc.c
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+++ b/ui/vnc.c
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@@ -2677,6 +2677,11 @@ static void vnc_refresh(DisplayChangeListener *dcl)
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VncState *vs, *vn;
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int has_dirty, rects = 0;
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+ if (QTAILQ_EMPTY(&vd->clients)) {
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+ update_displaychangelistener(&vd->dcl, VNC_REFRESH_INTERVAL_MAX);
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+ return;
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+ }
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+
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graphic_hw_update(NULL);
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if (vnc_trylock_display(vd)) {
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@@ -2692,11 +2697,6 @@ static void vnc_refresh(DisplayChangeListener *dcl)
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/* vs might be free()ed here */
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}
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- if (QTAILQ_EMPTY(&vd->clients)) {
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- update_displaychangelistener(&vd->dcl, VNC_REFRESH_INTERVAL_MAX);
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- return;
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- }
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-
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if (has_dirty && rects) {
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vd->dcl.update_interval /= 2;
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if (vd->dcl.update_interval < VNC_REFRESH_INTERVAL_BASE) {
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--
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1.8.3.1
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