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1 /*
2  * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
3  * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
4  * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
5  * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
6  * Copyright (c) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
7  *                     Linux for s390 port by D.J. Barrow
8  *                    <barrow_dj@mail.yahoo.com,djbarrow@de.ibm.com>
9  * Copyright (c) 2004 Roland McGrath <roland@redhat.com>
10  * Copyright (c) 2006 Dmitry V. Levin <ldv@altlinux.org>
11  * Copyright (c) 2006-2017 The strace developers.
12  * All rights reserved.
13  *
14  * Redistribution and use in source and binary forms, with or without
15  * modification, are permitted provided that the following conditions
16  * are met:
17  * 1. Redistributions of source code must retain the above copyright
18  *    notice, this list of conditions and the following disclaimer.
19  * 2. Redistributions in binary form must reproduce the above copyright
20  *    notice, this list of conditions and the following disclaimer in the
21  *    documentation and/or other materials provided with the distribution.
22  * 3. The name of the author may not be used to endorse or promote products
23  *    derived from this software without specific prior written permission.
24  *
25  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
26  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
29  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
30  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35  */
36
37 #include "defs.h"
38
39 /* Per-syscall stats structure */
40 struct call_counts {
41         /* time may be total latency or system time */
42         struct timeval time;
43         unsigned int calls, errors;
44 };
45
46 static struct call_counts *countv[SUPPORTED_PERSONALITIES];
47 #define counts (countv[current_personality])
48
49 static struct timeval shortest = { 1000000, 0 };
50
51 void
52 count_syscall(struct tcb *tcp, const struct timeval *syscall_exiting_tv)
53 {
54         struct timeval wtv;
55         struct timeval *tv = &wtv;
56         struct call_counts *cc;
57
58         if (!scno_in_range(tcp->scno))
59                 return;
60
61         if (!counts)
62                 counts = xcalloc(nsyscalls, sizeof(*counts));
63         cc = &counts[tcp->scno];
64
65         cc->calls++;
66         if (syserror(tcp))
67                 cc->errors++;
68
69         /* tv = wall clock time spent while in syscall */
70         tv_sub(tv, syscall_exiting_tv, &tcp->etime);
71
72         /* Spent more wall clock time than spent system time? (usually yes) */
73         if (tv_cmp(tv, &tcp->dtime) > 0) {
74                 static struct timeval one_tick = { -1, 0 };
75
76                 if (one_tick.tv_sec == -1) {
77                         /* Initialize it.  */
78                         struct itimerval it;
79
80                         memset(&it, 0, sizeof(it));
81                         it.it_interval.tv_usec = 1;
82                         setitimer(ITIMER_REAL, &it, NULL);
83                         getitimer(ITIMER_REAL, &it);
84                         one_tick = it.it_interval;
85 //FIXME: this hack doesn't work (tested on linux-3.6.11): one_tick = 0.000000
86 //tprintf(" one_tick.tv_usec:%u\n", (unsigned)one_tick.tv_usec);
87                 }
88
89                 if (tv_nz(&tcp->dtime))
90                         /* tv = system time spent, if it isn't 0 */
91                         tv = &tcp->dtime;
92                 else if (tv_cmp(tv, &one_tick) > 0) {
93                         /* tv = smallest "sane" time interval */
94                         if (tv_cmp(&shortest, &one_tick) < 0)
95                                 tv = &shortest;
96                         else
97                                 tv = &one_tick;
98                 }
99         }
100         if (tv_cmp(tv, &shortest) < 0)
101                 shortest = *tv;
102         tv_add(&cc->time, &cc->time, count_wallclock ? &wtv : tv);
103 }
104
105 static int
106 time_cmp(void *a, void *b)
107 {
108         return -tv_cmp(&counts[*((int *) a)].time,
109                        &counts[*((int *) b)].time);
110 }
111
112 static int
113 syscall_cmp(void *a, void *b)
114 {
115         const char *a_name = sysent[*((int *) a)].sys_name;
116         const char *b_name = sysent[*((int *) b)].sys_name;
117         return strcmp(a_name ? a_name : "", b_name ? b_name : "");
118 }
119
120 static int
121 count_cmp(void *a, void *b)
122 {
123         int     m = counts[*((int *) a)].calls;
124         int     n = counts[*((int *) b)].calls;
125
126         return (m < n) ? 1 : (m > n) ? -1 : 0;
127 }
128
129 static int (*sortfun)();
130 static struct timeval overhead = { -1, -1 };
131
132 void
133 set_sortby(const char *sortby)
134 {
135         if (strcmp(sortby, "time") == 0)
136                 sortfun = time_cmp;
137         else if (strcmp(sortby, "calls") == 0)
138                 sortfun = count_cmp;
139         else if (strcmp(sortby, "name") == 0)
140                 sortfun = syscall_cmp;
141         else if (strcmp(sortby, "nothing") == 0)
142                 sortfun = NULL;
143         else {
144                 error_msg_and_help("invalid sortby: '%s'", sortby);
145         }
146 }
147
148 void set_overhead(int n)
149 {
150         overhead.tv_sec = n / 1000000;
151         overhead.tv_usec = n % 1000000;
152 }
153
154 static void
155 call_summary_pers(FILE *outf)
156 {
157         static const char dashes[]  = "----------------";
158         static const char header[]  = "%6.6s %11.11s %11.11s %9.9s %9.9s %s\n";
159         static const char data[]    = "%6.2f %11.6f %11lu %9u %9.u %s\n";
160         static const char summary[] = "%6.6s %11.6f %11.11s %9u %9.u %s\n";
161
162         unsigned int i;
163         unsigned int call_cum, error_cum;
164         struct timeval tv_cum, dtv;
165         double  float_tv_cum;
166         double  percent;
167         int    *sorted_count;
168
169         fprintf(outf, header,
170                 "% time", "seconds", "usecs/call",
171                 "calls", "errors", "syscall");
172         fprintf(outf, header, dashes, dashes, dashes, dashes, dashes, dashes);
173
174         sorted_count = xcalloc(sizeof(int), nsyscalls);
175         call_cum = error_cum = tv_cum.tv_sec = tv_cum.tv_usec = 0;
176         if (overhead.tv_sec == -1) {
177                 tv_mul(&overhead, &shortest, 8);
178                 tv_div(&overhead, &overhead, 10);
179         }
180         for (i = 0; i < nsyscalls; i++) {
181                 sorted_count[i] = i;
182                 if (counts == NULL || counts[i].calls == 0)
183                         continue;
184                 tv_mul(&dtv, &overhead, counts[i].calls);
185                 tv_sub(&counts[i].time, &counts[i].time, &dtv);
186                 call_cum += counts[i].calls;
187                 error_cum += counts[i].errors;
188                 tv_add(&tv_cum, &tv_cum, &counts[i].time);
189         }
190         float_tv_cum = tv_float(&tv_cum);
191         if (counts) {
192                 if (sortfun)
193                         qsort((void *) sorted_count, nsyscalls, sizeof(int), sortfun);
194                 for (i = 0; i < nsyscalls; i++) {
195                         double float_syscall_time;
196                         int idx = sorted_count[i];
197                         struct call_counts *cc = &counts[idx];
198                         if (cc->calls == 0)
199                                 continue;
200                         tv_div(&dtv, &cc->time, cc->calls);
201                         float_syscall_time = tv_float(&cc->time);
202                         percent = (100.0 * float_syscall_time);
203                         if (percent != 0.0)
204                                    percent /= float_tv_cum;
205                         /* else: float_tv_cum can be 0.0 too and we get 0/0 = NAN */
206                         fprintf(outf, data,
207                                 percent, float_syscall_time,
208                                 (long) (1000000 * dtv.tv_sec + dtv.tv_usec),
209                                 cc->calls,
210                                 cc->errors, sysent[idx].sys_name);
211                 }
212         }
213         free(sorted_count);
214
215         fprintf(outf, header, dashes, dashes, dashes, dashes, dashes, dashes);
216         fprintf(outf, summary,
217                 "100.00", float_tv_cum, "",
218                 call_cum, error_cum, "total");
219 }
220
221 void
222 call_summary(FILE *outf)
223 {
224         unsigned int i, old_pers = current_personality;
225
226         for (i = 0; i < SUPPORTED_PERSONALITIES; ++i) {
227                 if (!countv[i])
228                         continue;
229
230                 if (current_personality != i)
231                         set_personality(i);
232                 if (i)
233                         fprintf(outf,
234                                 "System call usage summary for %s mode:\n",
235                                 personality_names[i]);
236                 call_summary_pers(outf);
237         }
238
239         if (old_pers != current_personality)
240                 set_personality(old_pers);
241 }