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vnc: add a way to get the update frequency for a given region 

This patch compute the update frequency (in Hz) for each 64x64 rects.
Any adaptive encoding can get this value using vnc_update_freq(), and
switch to a lossy encoding if the value is too high.

The frequency is pre-calculated every 500ms, based on the last 10
updates per 64x64 rect.

If a 64x64 rect was not updated in the last 2 second, then the frequency
became 0, and all the stored timestamp are reseted.

Signed-off-by: Corentin Chary <corentincj@iksaif.net>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Corentin Chary 2011-02-04 09:05:55 +01:00 committed by Anthony Liguori
parent b31f519e27
commit 999342a0fe
2 changed files with 120 additions and 0 deletions
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101
ui/vnc.c
View File

@ -35,6 +35,8 @@
#define VNC_REFRESH_INTERVAL_BASE 30
#define VNC_REFRESH_INTERVAL_INC 50
#define VNC_REFRESH_INTERVAL_MAX 2000
static const struct timeval VNC_REFRESH_STATS = { 0, 500000 };
static const struct timeval VNC_REFRESH_LOSSY = { 2, 0 };
#include "vnc_keysym.h"
#include "d3des.h"
@ -2258,6 +2260,99 @@ static int protocol_version(VncState *vs, uint8_t *version, size_t len)
return 0;
}
static VncRectStat *vnc_stat_rect(VncDisplay *vd, int x, int y)
{
struct VncSurface *vs = &vd->guest;
return &vs->stats[y / VNC_STAT_RECT][x / VNC_STAT_RECT];
}
static void vnc_update_stats(VncDisplay *vd, struct timeval * tv)
{
int x, y;
struct timeval res;
for (y = 0; y < vd->guest.ds->height; y += VNC_STAT_RECT) {
for (x = 0; x < vd->guest.ds->width; x += VNC_STAT_RECT) {
VncRectStat *rect = vnc_stat_rect(vd, x, y);
rect->updated = false;
}
}
timersub(tv, &VNC_REFRESH_STATS, &res);
if (timercmp(&vd->guest.last_freq_check, &res, >)) {
return ;
}
vd->guest.last_freq_check = *tv;
for (y = 0; y < vd->guest.ds->height; y += VNC_STAT_RECT) {
for (x = 0; x < vd->guest.ds->width; x += VNC_STAT_RECT) {
VncRectStat *rect= vnc_stat_rect(vd, x, y);
int count = ARRAY_SIZE(rect->times);
struct timeval min, max;
if (!timerisset(&rect->times[count - 1])) {
continue ;
}
max = rect->times[(rect->idx + count - 1) % count];
timersub(tv, &max, &res);
if (timercmp(&res, &VNC_REFRESH_LOSSY, >)) {
rect->freq = 0;
memset(rect->times, 0, sizeof (rect->times));
continue ;
}
min = rect->times[rect->idx];
max = rect->times[(rect->idx + count - 1) % count];
timersub(&max, &min, &res);
rect->freq = res.tv_sec + res.tv_usec / 1000000.;
rect->freq /= count;
rect->freq = 1. / rect->freq;
}
}
}
double vnc_update_freq(VncState *vs, int x, int y, int w, int h)
{
int i, j;
double total = 0;
int num = 0;
x = (x / VNC_STAT_RECT) * VNC_STAT_RECT;
y = (y / VNC_STAT_RECT) * VNC_STAT_RECT;
for (j = y; j <= y + h; j += VNC_STAT_RECT) {
for (i = x; i <= x + w; i += VNC_STAT_RECT) {
total += vnc_stat_rect(vs->vd, i, j)->freq;
num++;
}
}
if (num) {
return total / num;
} else {
return 0;
}
}
static void vnc_rect_updated(VncDisplay *vd, int x, int y, struct timeval * tv)
{
VncRectStat *rect;
rect = vnc_stat_rect(vd, x, y);
if (rect->updated) {
return ;
}
rect->times[rect->idx] = *tv;
rect->idx = (rect->idx + 1) % ARRAY_SIZE(rect->times);
rect->updated = true;
}
static int vnc_refresh_server_surface(VncDisplay *vd)
{
int y;
@ -2268,6 +2363,11 @@ static int vnc_refresh_server_surface(VncDisplay *vd)
VncState *vs;
int has_dirty = 0;
struct timeval tv;
gettimeofday(&tv, NULL);
vnc_update_stats(vd, &tv);
/*
* Walk through the guest dirty map.
* Check and copy modified bits from guest to server surface.
@ -2294,6 +2394,7 @@ static int vnc_refresh_server_surface(VncDisplay *vd)
if (memcmp(server_ptr, guest_ptr, cmp_bytes) == 0)
continue;
memcpy(server_ptr, guest_ptr, cmp_bytes);
vnc_rect_updated(vd, x, y, &tv);
QTAILQ_FOREACH(vs, &vd->clients, next) {
vnc_set_bit(vs->dirty[y], (x / 16));
}

19
ui/vnc.h
View File

@ -80,6 +80,10 @@ typedef void VncSendHextileTile(VncState *vs,
#define VNC_MAX_HEIGHT 2048
#define VNC_DIRTY_WORDS (VNC_MAX_WIDTH / (16 * 32))
#define VNC_STAT_RECT 64
#define VNC_STAT_COLS (VNC_MAX_WIDTH / VNC_STAT_RECT)
#define VNC_STAT_ROWS (VNC_MAX_HEIGHT / VNC_STAT_RECT)
#define VNC_AUTH_CHALLENGE_SIZE 16
typedef struct VncDisplay VncDisplay;
@ -92,9 +96,23 @@ typedef struct VncDisplay VncDisplay;
#include "vnc-auth-sasl.h"
#endif
struct VncRectStat
{
/* time of last 10 updates, to find update frequency */
struct timeval times[10];
int idx;
double freq; /* Update frequency (in Hz) */
bool updated; /* Already updated during this refresh */
};
typedef struct VncRectStat VncRectStat;
struct VncSurface
{
struct timeval last_freq_check;
uint32_t dirty[VNC_MAX_HEIGHT][VNC_DIRTY_WORDS];
VncRectStat stats[VNC_STAT_ROWS][VNC_STAT_COLS];
DisplaySurface *ds;
};
@ -479,6 +497,7 @@ void vnc_framebuffer_update(VncState *vs, int x, int y, int w, int h,
int32_t encoding);
void vnc_convert_pixel(VncState *vs, uint8_t *buf, uint32_t v);
double vnc_update_freq(VncState *vs, int x, int y, int w, int h);
/* Encodings */
int vnc_send_framebuffer_update(VncState *vs, int x, int y, int w, int h);