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1 | /* |
2 | * Copyright 2002-2004 Red Hat Inc., Durham, North Carolina. | |
3 | * | |
4 | * All Rights Reserved. | |
5 | * | |
6 | * Permission is hereby granted, free of charge, to any person obtaining | |
7 | * a copy of this software and associated documentation files (the | |
8 | * "Software"), to deal in the Software without restriction, including | |
9 | * without limitation on the rights to use, copy, modify, merge, | |
10 | * publish, distribute, sublicense, and/or sell copies of the Software, | |
11 | * and to permit persons to whom the Software is furnished to do so, | |
12 | * subject to the following conditions: | |
13 | * | |
14 | * The above copyright notice and this permission notice (including the | |
15 | * next paragraph) shall be included in all copies or substantial | |
16 | * portions of the Software. | |
17 | * | |
18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
19 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
20 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
21 | * NON-INFRINGEMENT. IN NO EVENT SHALL RED HAT AND/OR THEIR SUPPLIERS | |
22 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
23 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
24 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
25 | * SOFTWARE. | |
26 | */ | |
27 | ||
28 | /* | |
29 | * Authors: | |
30 | * Rickard E. (Rik) Faith <faith@redhat.com> | |
31 | * | |
32 | */ | |
33 | ||
34 | /** \file | |
35 | * | |
36 | * The DMX server code is written to call #dmxSync() whenever an XSync() | |
37 | * might be necessary. However, since XSync() requires a two way | |
38 | * communication with the other X server, eliminating unnecessary | |
39 | * XSync() calls is a key performance optimization. Support for this | |
40 | * optimization is provided here. Statistics about XSync() calls and | |
41 | * latency are gathered in \a dmxstat.c. | |
42 | * | |
43 | * During the initial conversion from calling XSync() immediately to the | |
44 | * XSync() batching method implemented in this file, it was noted that, | |
45 | * out of more than 300 \a x11perf tests, 8 tests became more than 100 | |
46 | * times faster, with 68 more than 50X faster, 114 more than 10X faster, | |
47 | * and 181 more than 2X faster. */ | |
48 | ||
49 | #ifdef HAVE_DMX_CONFIG_H | |
50 | #include <dmx-config.h> | |
51 | #endif | |
52 | ||
53 | #include "dmx.h" | |
54 | #include "dmxsync.h" | |
55 | #include "dmxstat.h" | |
56 | #include "dmxlog.h" | |
57 | #include <sys/time.h> | |
58 | ||
59 | static int dmxSyncInterval = 100; /* Default interval in milliseconds */ | |
60 | static OsTimerPtr dmxSyncTimer; | |
61 | static int dmxSyncPending; | |
62 | ||
63 | static void | |
64 | dmxDoSync(DMXScreenInfo * dmxScreen) | |
65 | { | |
66 | dmxScreen->needsSync = FALSE; | |
67 | ||
68 | if (!dmxScreen->beDisplay) | |
69 | return; /* FIXME: Is this correct behavior for sync stats? */ | |
70 | ||
71 | if (!dmxStatInterval) { | |
72 | XSync(dmxScreen->beDisplay, False); | |
73 | } | |
74 | else { | |
75 | struct timeval start, stop; | |
76 | ||
77 | gettimeofday(&start, 0); | |
78 | XSync(dmxScreen->beDisplay, False); | |
79 | gettimeofday(&stop, 0); | |
80 | dmxStatSync(dmxScreen, &stop, &start, dmxSyncPending); | |
81 | } | |
82 | } | |
83 | ||
84 | static CARD32 | |
85 | dmxSyncCallback(OsTimerPtr timer, CARD32 time, pointer arg) | |
86 | { | |
87 | int i; | |
88 | ||
89 | if (dmxSyncPending) { | |
90 | for (i = 0; i < dmxNumScreens; i++) { | |
91 | DMXScreenInfo *dmxScreen = &dmxScreens[i]; | |
92 | ||
93 | if (dmxScreen->needsSync) | |
94 | dmxDoSync(dmxScreen); | |
95 | } | |
96 | } | |
97 | dmxSyncPending = 0; | |
98 | return 0; /* Do not place on queue again */ | |
99 | } | |
100 | ||
101 | static void | |
102 | dmxSyncBlockHandler(pointer blockData, OSTimePtr pTimeout, pointer pReadMask) | |
103 | { | |
104 | TimerForce(dmxSyncTimer); | |
105 | } | |
106 | ||
107 | static void | |
108 | dmxSyncWakeupHandler(pointer blockData, int result, pointer pReadMask) | |
109 | { | |
110 | } | |
111 | ||
112 | /** Request the XSync() batching optimization with the specified \a | |
113 | * interval (in mS). If the \a interval is 0, 100mS is used. If the \a | |
114 | * interval is less than 0, then the XSync() batching optimization is | |
115 | * not requested (e.g., so the -syncbatch -1 command line option can | |
116 | * turn off the default 100mS XSync() batching). | |
117 | * | |
118 | * Note that the parameter to this routine is a string, since it will | |
119 | * usually be called from #ddxProcessArgument in \a dmxinit.c */ | |
120 | void | |
121 | dmxSyncActivate(const char *interval) | |
122 | { | |
123 | dmxSyncInterval = (interval ? atoi(interval) : 100); | |
124 | ||
125 | if (dmxSyncInterval < 0) | |
126 | dmxSyncInterval = 0; | |
127 | } | |
128 | ||
129 | /** Initialize the XSync() batching optimization, but only if | |
130 | * #dmxSyncActivate was last called with a non-negative value. */ | |
131 | void | |
132 | dmxSyncInit(void) | |
133 | { | |
134 | if (dmxSyncInterval) { | |
135 | RegisterBlockAndWakeupHandlers(dmxSyncBlockHandler, | |
136 | dmxSyncWakeupHandler, NULL); | |
137 | dmxLog(dmxInfo, "XSync batching with %d ms interval\n", | |
138 | dmxSyncInterval); | |
139 | } | |
140 | else { | |
141 | dmxLog(dmxInfo, "XSync batching disabled\n"); | |
142 | } | |
143 | } | |
144 | ||
145 | /** Request an XSync() to the display used by \a dmxScreen. If \a now | |
146 | * is TRUE, call XSync() immediately instead of waiting for the next | |
147 | * XSync() batching point. Note that if XSync() batching was deselected | |
148 | * with #dmxSyncActivate() before #dmxSyncInit() was called, then no | |
149 | * XSync() batching is performed and this function always calles XSync() | |
150 | * immediately. | |
151 | * | |
152 | * (Note that this function uses TimerSet but works correctly in the | |
153 | * face of a server generation. See the source for details.) | |
154 | * | |
155 | * If \a dmxScreen is \a NULL, then all pending syncs will be flushed | |
156 | * immediately. | |
157 | */ | |
158 | void | |
159 | dmxSync(DMXScreenInfo * dmxScreen, Bool now) | |
160 | { | |
161 | static unsigned long dmxGeneration = 0; | |
162 | ||
163 | if (dmxSyncInterval) { | |
164 | if (dmxGeneration != serverGeneration) { | |
165 | /* Server generation does a TimerInit, which frees all | |
166 | * timers. So, at this point dmxSyncTimer is either: | |
167 | * 1) NULL, iff dmxGeneration == 0, | |
168 | * 2) freed, if it was on a queue (dmxSyncPending != 0), or | |
169 | * 3) allocated, if it wasn't on a queue (dmxSyncPending == 0) | |
170 | */ | |
171 | if (dmxSyncTimer && !dmxSyncPending) | |
172 | free(dmxSyncTimer); | |
173 | dmxSyncTimer = NULL; | |
174 | now = TRUE; | |
175 | dmxGeneration = serverGeneration; | |
176 | } | |
177 | /* Queue sync */ | |
178 | if (dmxScreen) { | |
179 | dmxScreen->needsSync = TRUE; | |
180 | ++dmxSyncPending; | |
181 | } | |
182 | ||
183 | /* Do sync or set time for later */ | |
184 | if (now || !dmxScreen) { | |
185 | if (!TimerForce(dmxSyncTimer)) | |
186 | dmxSyncCallback(NULL, 0, NULL); | |
187 | /* At this point, dmxSyncPending == 0 because | |
188 | * dmxSyncCallback must have been called. */ | |
189 | if (dmxSyncPending) | |
190 | dmxLog(dmxFatal, "dmxSync(%s,%d): dmxSyncPending = %d\n", | |
191 | dmxScreen ? dmxScreen->name : "", now, dmxSyncPending); | |
192 | } | |
193 | else { | |
194 | dmxScreen->needsSync = TRUE; | |
195 | if (dmxSyncPending == 1) | |
196 | dmxSyncTimer = TimerSet(dmxSyncTimer, 0, dmxSyncInterval, | |
197 | dmxSyncCallback, NULL); | |
198 | } | |
199 | } | |
200 | else { | |
201 | /* If dmxSyncInterval is not being used, | |
202 | * then all the backends are already | |
203 | * up-to-date. */ | |
204 | if (dmxScreen) | |
205 | dmxDoSync(dmxScreen); | |
206 | } | |
207 | } |