[Qemu-devel] [PATCH] Fix and simplify gui timer logic.

[Gerd Hoffmann <kraxel@redhat.com>]

Kill nographic timer.  Have a global gui_timer instead.  Have the gui
timer enabled unconditionally.  We need a timer running anyway for mmio
flush, so the whole have-gui-timer-only-when-needed logic is pretty
pointless.  It also simplifies displaylisteners coming and going at
runtime, we don't need to care about the timer then as it runs anyway.

Don't allocate the timer twice in case we have two display listeners.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 console.h |    1 -
 vl.c      |   37 +++++++++++--------------------------
 2 files changed, 11 insertions(+), 27 deletions(-)

diff --git a/console.h b/console.h
index 264a396..cdf8dee 100644
--- a/console.h
+++ b/console.h
@@ -173,7 +173,6 @@ struct DisplayAllocator {
 struct DisplayState {
     struct DisplaySurface *surface;
     void *opaque;
-    struct QEMUTimer *gui_timer;
 
     struct DisplayAllocator* allocator;
     QLIST_HEAD(, DisplayChangeListener) listeners;
diff --git a/vl.c b/vl.c
index f66f420..670705c 100644
--- a/vl.c
+++ b/vl.c
@@ -236,7 +236,7 @@ int nb_numa_nodes;
 uint64_t node_mem[MAX_NODES];
 uint64_t node_cpumask[MAX_NODES];
 
-static QEMUTimer *nographic_timer;
+static QEMUTimer *gui_timer;
 
 uint8_t qemu_uuid[16];
 
@@ -1633,22 +1633,17 @@ static void gui_update(void *opaque)
     DisplayChangeListener *dcl;
 
     qemu_flush_coalesced_mmio_buffer();
-    dpy_refresh(ds);
 
-    QLIST_FOREACH(dcl, &ds->listeners, next) {
-        if (dcl->gui_timer_interval &&
-            dcl->gui_timer_interval < interval)
-            interval = dcl->gui_timer_interval;
+    if (ds != NULL && !QLIST_EMPTY(&ds->listeners)) {
+        dpy_refresh(ds);
+        QLIST_FOREACH(dcl, &ds->listeners, next) {
+            if (dcl->gui_timer_interval &&
+                dcl->gui_timer_interval < interval)
+                interval = dcl->gui_timer_interval;
+        }
     }
-    qemu_mod_timer(ds->gui_timer, interval + qemu_get_clock(rt_clock));
-}
-
-static void nographic_update(void *opaque)
-{
-    uint64_t interval = GUI_REFRESH_INTERVAL;
 
-    qemu_flush_coalesced_mmio_buffer();
-    qemu_mod_timer(nographic_timer, interval + qemu_get_clock(rt_clock));
+    qemu_mod_timer(gui_timer, interval + qemu_get_clock(rt_clock));
 }
 
 struct vm_change_state_entry {
@@ -2577,7 +2572,6 @@ int main(int argc, char **argv, char **envp)
     const char *kernel_filename, *kernel_cmdline;
     char boot_devices[33] = "cad"; /* default to HD->floppy->CD-ROM */
     DisplayState *ds;
-    DisplayChangeListener *dcl;
     int cyls, heads, secs, translation;
     QemuOpts *hda_opts = NULL, *opts;
     int optind;
@@ -3817,17 +3811,8 @@ int main(int argc, char **argv, char **envp)
     }
     dpy_resize(ds);
 
-    QLIST_FOREACH(dcl, &ds->listeners, next) {
-        if (dcl->dpy_refresh != NULL) {
-            ds->gui_timer = qemu_new_timer(rt_clock, gui_update, ds);
-            qemu_mod_timer(ds->gui_timer, qemu_get_clock(rt_clock));
-        }
-    }
-
-    if (display_type == DT_NOGRAPHIC || display_type == DT_VNC) {
-        nographic_timer = qemu_new_timer(rt_clock, nographic_update, NULL);
-        qemu_mod_timer(nographic_timer, qemu_get_clock(rt_clock));
-    }
+    gui_timer = qemu_new_timer(rt_clock, gui_update, ds);
+    qemu_mod_timer(gui_timer, qemu_get_clock(rt_clock));
 
     text_consoles_set_display(ds);
 
-- 
1.6.6.1