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-rw-r--r--xorg-server/hw/dmx/dmxstat.c222
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diff --git a/xorg-server/hw/dmx/dmxstat.c b/xorg-server/hw/dmx/dmxstat.c
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+/*
+ * Copyright 2002, 2003 Red Hat Inc., Durham, North Carolina.
+ *
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation on the rights to use, copy, modify, merge,
+ * publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial
+ * portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NON-INFRINGEMENT. IN NO EVENT SHALL RED HAT AND/OR THEIR SUPPLIERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+/*
+ * Authors:
+ * Rickard E. (Rik) Faith <faith@redhat.com>
+ *
+ */
+
+/** \file
+ *
+ * The DMX server code is written to call #dmxSync() whenever an XSync()
+ * might be necessary. However, since XSync() requires a two way
+ * communication with the other X server, eliminating unnecessary
+ * XSync() calls is a key performance optimization. Support for this
+ * optimization is provided in #dmxsync.c. This file provides routines
+ * that evaluate this optimization by counting the number of XSync()
+ * calls and monitoring their latency. This functionality can be turned
+ * on using the -stat command-line parameter. */
+
+#ifdef HAVE_DMX_CONFIG_H
+#include <dmx-config.h>
+#endif
+
+#include "dmx.h"
+#include "dmxstat.h"
+#include "dmxlog.h"
+#include <X11/Xos.h> /* For sys/time.h */
+
+/** Used to compute a running average of value. */
+typedef struct _DMXStatAvg {
+ int pos;
+ int count;
+ unsigned long value[DMX_STAT_LENGTH];
+} DMXStatAvg;
+
+/** Statistical information about XSync calls. */
+struct _DMXStatInfo {
+ unsigned long syncCount;
+ unsigned long oldSyncCount;
+
+ DMXStatAvg usec;
+ DMXStatAvg pending;
+
+ unsigned long bins[DMX_STAT_BINS];
+};
+
+/* Interval in mS between statistic message log entries. */
+ int dmxStatInterval;
+static int dmxStatDisplays;
+static OsTimerPtr dmxStatTimer;
+
+/** Return the number of microseconds as an unsigned long.
+ * Unfortunately, this is only useful for intervals < about 4 sec. */
+static unsigned long usec(struct timeval *stop, struct timeval *start)
+{
+ return (stop->tv_sec - start->tv_sec) * 1000000
+ + stop->tv_usec - start->tv_usec;
+}
+
+static unsigned long avg(DMXStatAvg *data, unsigned long *max)
+{
+ unsigned long sum;
+ int i;
+
+ *max = 0;
+ if (!data->count) return 0;
+
+ for (i = 0, sum = 0; i < data->count; i++) {
+ if (data->value[i] > *max) *max = data->value[i];
+ sum += data->value[i];
+ }
+ return sum / data->count;
+}
+
+/** Turn on XSync statistic gathering and printing. Print every \a
+ * interval seconds, with lines for the first \a displays. If \a
+ * interval is NULL, 1 will be used. If \a displays is NULL, 0 will be
+ * used (meaning a line for every display will be printed). Note that
+ * this function takes string arguments because it will usually be
+ * called from #ddxProcessArgument in #dmxinit.c. */
+void dmxStatActivate(const char *interval, const char *displays)
+{
+ dmxStatInterval = (interval ? atoi(interval) : 1) * 1000;
+ dmxStatDisplays = (displays ? atoi(displays) : 0);
+
+ if (dmxStatInterval < 1000) dmxStatInterval = 1000;
+ if (dmxStatDisplays < 0) dmxStatDisplays = 0;
+}
+
+/** Allocate a \a DMXStatInfo structure. */
+DMXStatInfo *dmxStatAlloc(void)
+{
+ DMXStatInfo *pt = malloc(sizeof(*pt));
+ memset(pt, 0, sizeof(*pt));
+ return pt;
+}
+
+/** Free the memory used by a \a DMXStatInfo structure. */
+void dmxStatFree(DMXStatInfo *pt)
+{
+ if (pt) free(pt);
+}
+
+static void dmxStatValue(DMXStatAvg *data, unsigned long value)
+{
+ if (data->count != DMX_STAT_LENGTH) ++data->count;
+ if (data->pos >= DMX_STAT_LENGTH-1) data->pos = 0;
+ data->value[data->pos++] = value;
+}
+
+/** Note that a XSync() was just done on \a dmxScreen with the \a start
+ * and \a stop times (from gettimeofday()) and the number of
+ * pending-but-not-yet-processed XSync requests. This routine is called
+ * from #dmxDoSync in #dmxsync.c */
+void dmxStatSync(DMXScreenInfo *dmxScreen,
+ struct timeval *stop, struct timeval *start,
+ unsigned long pending)
+{
+ DMXStatInfo *s = dmxScreen->stat;
+ unsigned long elapsed = usec(stop, start);
+ unsigned long thresh;
+ int i;
+
+ ++s->syncCount;
+ dmxStatValue(&s->usec, elapsed);
+ dmxStatValue(&s->pending, pending);
+
+ for (i = 0, thresh = DMX_STAT_BIN0; i < DMX_STAT_BINS-1; i++) {
+ if (elapsed < thresh) {
+ ++s->bins[i];
+ break;
+ }
+ thresh *= DMX_STAT_BINMULT;
+ }
+ if (i == DMX_STAT_BINS-1) ++s->bins[i];
+}
+
+/* Actually do the work of printing out the human-readable message. */
+static CARD32 dmxStatCallback(OsTimerPtr timer, CARD32 t, pointer arg)
+{
+ int i, j;
+ static int header = 0;
+ int limit = dmxNumScreens;
+
+ if (!dmxNumScreens) {
+ header = 0;
+ return DMX_STAT_INTERVAL;
+ }
+
+ if (!header++ || !(header % 10)) {
+ dmxLog(dmxDebug,
+ " S SyncCount Sync/s avSync mxSync avPend mxPend | "
+ "<10ms <1s >1s\n");
+ }
+
+ if (dmxStatDisplays && dmxStatDisplays < limit) limit = dmxStatDisplays;
+ for (i = 0; i < limit; i++) {
+ DMXScreenInfo *dmxScreen = &dmxScreens[i];
+ DMXStatInfo *s = dmxScreen->stat;
+ unsigned long aSync, mSync;
+ unsigned long aPend, mPend;
+
+ if (!s) continue;
+
+ aSync = avg(&s->usec, &mSync);
+ aPend = avg(&s->pending, &mPend);
+ dmxLog(dmxDebug, "%2d %9lu %7lu %6lu %6lu %6lu %6lu |",
+ i, /* S */
+ s->syncCount, /* SyncCount */
+ (s->syncCount
+ - s->oldSyncCount) * 1000 / dmxStatInterval, /* Sync/s */
+ aSync, /* us/Sync */
+ mSync, /* max/Sync */
+ aPend, /* avgPend */
+ mPend); /* maxPend */
+ for (j = 0; j < DMX_STAT_BINS; j++)
+ dmxLogCont(dmxDebug, " %5lu", s->bins[j]);
+ dmxLogCont(dmxDebug, "\n");
+
+ /* Reset/clear */
+ s->oldSyncCount = s->syncCount;
+ for (j = 0; j < DMX_STAT_BINS; j++) s->bins[j] = 0;
+ }
+ return DMX_STAT_INTERVAL; /* Place on queue again */
+}
+
+/** Try to initialize the statistic gathering and printing routines.
+ * Initialization only takes place if #dmxStatActivate has already been
+ * called. We don't need the same generation protection that we used in
+ * dmxSyncInit because our timer is always on a queue -- hence, server
+ * generation will always free it. */
+void dmxStatInit(void)
+{
+ if (dmxStatInterval)
+ dmxStatTimer = TimerSet(NULL, 0,
+ dmxStatInterval, dmxStatCallback, NULL);
+}