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1 | /* |
2 | * Copyright 2002, 2003 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 in \a dmxsync.c. This file provides routines | |
41 | * that evaluate this optimization by counting the number of XSync() | |
42 | * calls and monitoring their latency. This functionality can be turned | |
43 | * on using the -stat command-line parameter. */ | |
44 | ||
45 | #ifdef HAVE_DMX_CONFIG_H | |
46 | #include <dmx-config.h> | |
47 | #endif | |
48 | ||
49 | #include "dmx.h" | |
50 | #include "dmxstat.h" | |
51 | #include "dmxlog.h" | |
52 | #include <X11/Xos.h> /* For sys/time.h */ | |
53 | ||
54 | /** Used to compute a running average of value. */ | |
55 | typedef struct _DMXStatAvg { | |
56 | int pos; | |
57 | int count; | |
58 | unsigned long value[DMX_STAT_LENGTH]; | |
59 | } DMXStatAvg; | |
60 | ||
61 | /** Statistical information about XSync calls. */ | |
62 | struct _DMXStatInfo { | |
63 | unsigned long syncCount; | |
64 | unsigned long oldSyncCount; | |
65 | ||
66 | DMXStatAvg usec; | |
67 | DMXStatAvg pending; | |
68 | ||
69 | unsigned long bins[DMX_STAT_BINS]; | |
70 | }; | |
71 | ||
72 | /* Interval in mS between statistic message log entries. */ | |
73 | int dmxStatInterval; | |
74 | static int dmxStatDisplays; | |
75 | static OsTimerPtr dmxStatTimer; | |
76 | ||
77 | /** Return the number of microseconds as an unsigned long. | |
78 | * Unfortunately, this is only useful for intervals < about 4 sec. */ | |
79 | static unsigned long | |
80 | usec(struct timeval *stop, struct timeval *start) | |
81 | { | |
82 | return (stop->tv_sec - start->tv_sec) * 1000000 | |
83 | + stop->tv_usec - start->tv_usec; | |
84 | } | |
85 | ||
86 | static unsigned long | |
87 | avg(DMXStatAvg * data, unsigned long *max) | |
88 | { | |
89 | unsigned long sum; | |
90 | int i; | |
91 | ||
92 | *max = 0; | |
93 | if (!data->count) | |
94 | return 0; | |
95 | ||
96 | for (i = 0, sum = 0; i < data->count; i++) { | |
97 | if (data->value[i] > *max) | |
98 | *max = data->value[i]; | |
99 | sum += data->value[i]; | |
100 | } | |
101 | return sum / data->count; | |
102 | } | |
103 | ||
104 | /** Turn on XSync statistic gathering and printing. Print every \a | |
105 | * interval seconds, with lines for the first \a displays. If \a | |
106 | * interval is NULL, 1 will be used. If \a displays is NULL, 0 will be | |
107 | * used (meaning a line for every display will be printed). Note that | |
108 | * this function takes string arguments because it will usually be | |
109 | * called from #ddxProcessArgument in \a dmxinit.c. */ | |
110 | void | |
111 | dmxStatActivate(const char *interval, const char *displays) | |
112 | { | |
113 | dmxStatInterval = (interval ? atoi(interval) : 1) * 1000; | |
114 | dmxStatDisplays = (displays ? atoi(displays) : 0); | |
115 | ||
116 | if (dmxStatInterval < 1000) | |
117 | dmxStatInterval = 1000; | |
118 | if (dmxStatDisplays < 0) | |
119 | dmxStatDisplays = 0; | |
120 | } | |
121 | ||
122 | /** Allocate a \a DMXStatInfo structure. */ | |
123 | DMXStatInfo * | |
124 | dmxStatAlloc(void) | |
125 | { | |
126 | DMXStatInfo *pt = calloc(1, sizeof(*pt)); | |
127 | ||
128 | return pt; | |
129 | } | |
130 | ||
131 | /** Free the memory used by a \a DMXStatInfo structure. */ | |
132 | void | |
133 | dmxStatFree(DMXStatInfo * pt) | |
134 | { | |
135 | free(pt); | |
136 | } | |
137 | ||
138 | static void | |
139 | dmxStatValue(DMXStatAvg * data, unsigned long value) | |
140 | { | |
141 | if (data->count != DMX_STAT_LENGTH) | |
142 | ++data->count; | |
143 | if (data->pos >= DMX_STAT_LENGTH - 1) | |
144 | data->pos = 0; | |
145 | data->value[data->pos++] = value; | |
146 | } | |
147 | ||
148 | /** Note that a XSync() was just done on \a dmxScreen with the \a start | |
149 | * and \a stop times (from gettimeofday()) and the number of | |
150 | * pending-but-not-yet-processed XSync requests. This routine is called | |
151 | * from #dmxDoSync in \a dmxsync.c */ | |
152 | void | |
153 | dmxStatSync(DMXScreenInfo * dmxScreen, | |
154 | struct timeval *stop, struct timeval *start, unsigned long pending) | |
155 | { | |
156 | DMXStatInfo *s = dmxScreen->stat; | |
157 | unsigned long elapsed = usec(stop, start); | |
158 | unsigned long thresh; | |
159 | int i; | |
160 | ||
161 | ++s->syncCount; | |
162 | dmxStatValue(&s->usec, elapsed); | |
163 | dmxStatValue(&s->pending, pending); | |
164 | ||
165 | for (i = 0, thresh = DMX_STAT_BIN0; i < DMX_STAT_BINS - 1; i++) { | |
166 | if (elapsed < thresh) { | |
167 | ++s->bins[i]; | |
168 | break; | |
169 | } | |
170 | thresh *= DMX_STAT_BINMULT; | |
171 | } | |
172 | if (i == DMX_STAT_BINS - 1) | |
173 | ++s->bins[i]; | |
174 | } | |
175 | ||
176 | /* Actually do the work of printing out the human-readable message. */ | |
177 | static CARD32 | |
178 | dmxStatCallback(OsTimerPtr timer, CARD32 t, pointer arg) | |
179 | { | |
180 | int i, j; | |
181 | static int header = 0; | |
182 | int limit = dmxNumScreens; | |
183 | ||
184 | if (!dmxNumScreens) { | |
185 | header = 0; | |
186 | return DMX_STAT_INTERVAL; | |
187 | } | |
188 | ||
189 | if (!header++ || !(header % 10)) { | |
190 | dmxLog(dmxDebug, | |
191 | " S SyncCount Sync/s avSync mxSync avPend mxPend | " | |
192 | "<10ms <1s >1s\n"); | |
193 | } | |
194 | ||
195 | if (dmxStatDisplays && dmxStatDisplays < limit) | |
196 | limit = dmxStatDisplays; | |
197 | for (i = 0; i < limit; i++) { | |
198 | DMXScreenInfo *dmxScreen = &dmxScreens[i]; | |
199 | DMXStatInfo *s = dmxScreen->stat; | |
200 | unsigned long aSync, mSync; | |
201 | unsigned long aPend, mPend; | |
202 | ||
203 | if (!s) | |
204 | continue; | |
205 | ||
206 | aSync = avg(&s->usec, &mSync); | |
207 | aPend = avg(&s->pending, &mPend); | |
208 | dmxLog(dmxDebug, "%2d %9lu %7lu %6lu %6lu %6lu %6lu |", i, /* S */ | |
209 | s->syncCount, /* SyncCount */ | |
210 | (s->syncCount - s->oldSyncCount) * 1000 / dmxStatInterval, /* Sync/s */ | |
211 | aSync, /* us/Sync */ | |
212 | mSync, /* max/Sync */ | |
213 | aPend, /* avgPend */ | |
214 | mPend); /* maxPend */ | |
215 | for (j = 0; j < DMX_STAT_BINS; j++) | |
216 | dmxLogCont(dmxDebug, " %5lu", s->bins[j]); | |
217 | dmxLogCont(dmxDebug, "\n"); | |
218 | ||
219 | /* Reset/clear */ | |
220 | s->oldSyncCount = s->syncCount; | |
221 | for (j = 0; j < DMX_STAT_BINS; j++) | |
222 | s->bins[j] = 0; | |
223 | } | |
224 | return DMX_STAT_INTERVAL; /* Place on queue again */ | |
225 | } | |
226 | ||
227 | /** Try to initialize the statistic gathering and printing routines. | |
228 | * Initialization only takes place if #dmxStatActivate has already been | |
229 | * called. We don't need the same generation protection that we used in | |
230 | * dmxSyncInit because our timer is always on a queue -- hence, server | |
231 | * generation will always free it. */ | |
232 | void | |
233 | dmxStatInit(void) | |
234 | { | |
235 | if (dmxStatInterval) | |
236 | dmxStatTimer = TimerSet(NULL, 0, | |
237 | dmxStatInterval, dmxStatCallback, NULL); | |
238 | } |