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 * All rights reserved.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. The name of the author may not be used to endorse or promote products
22 * derived from this software without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
33 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35
36 #include "defs.h"
37
38 /* Per-syscall stats structure */
39 struct call_counts {
40 /* time may be total latency or system time */
41 struct timeval time;
42 int calls, errors;
43 };
44
45 static struct call_counts *countv[SUPPORTED_PERSONALITIES];
46 #define counts (countv[current_personality])
47
48 static struct timeval shortest = { 1000000, 0 };
49
50 void
count_syscall(struct tcb * tcp,const struct timeval * syscall_exiting_tv)51 count_syscall(struct tcb *tcp, const struct timeval *syscall_exiting_tv)
52 {
53 struct timeval wtv;
54 struct timeval *tv = &wtv;
55 struct call_counts *cc;
56 unsigned long scno = tcp->scno;
57
58 if (!SCNO_IN_RANGE(scno))
59 return;
60
61 if (!counts)
62 counts = xcalloc(nsyscalls, sizeof(*counts));
63 cc = &counts[scno];
64
65 cc->calls++;
66 if (tcp->u_error)
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
time_cmp(void * a,void * b)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
syscall_cmp(void * a,void * b)113 syscall_cmp(void *a, void *b)
114 {
115 return strcmp(sysent[*((int *) a)].sys_name,
116 sysent[*((int *) b)].sys_name);
117 }
118
119 static int
count_cmp(void * a,void * b)120 count_cmp(void *a, void *b)
121 {
122 int m = counts[*((int *) a)].calls;
123 int n = counts[*((int *) b)].calls;
124
125 return (m < n) ? 1 : (m > n) ? -1 : 0;
126 }
127
128 static int (*sortfun)();
129 static struct timeval overhead = { -1, -1 };
130
131 void
set_sortby(const char * sortby)132 set_sortby(const char *sortby)
133 {
134 if (strcmp(sortby, "time") == 0)
135 sortfun = time_cmp;
136 else if (strcmp(sortby, "calls") == 0)
137 sortfun = count_cmp;
138 else if (strcmp(sortby, "name") == 0)
139 sortfun = syscall_cmp;
140 else if (strcmp(sortby, "nothing") == 0)
141 sortfun = NULL;
142 else {
143 error_msg_and_help("invalid sortby: '%s'", sortby);
144 }
145 }
146
set_overhead(int n)147 void set_overhead(int n)
148 {
149 overhead.tv_sec = n / 1000000;
150 overhead.tv_usec = n % 1000000;
151 }
152
153 static void
call_summary_pers(FILE * outf)154 call_summary_pers(FILE *outf)
155 {
156 unsigned int i;
157 int call_cum, error_cum;
158 struct timeval tv_cum, dtv;
159 double float_tv_cum;
160 double percent;
161 const char *dashes = "----------------";
162 char error_str[sizeof(int)*3];
163 int *sorted_count;
164
165 fprintf(outf, "%6.6s %11.11s %11.11s %9.9s %9.9s %s\n",
166 "% time", "seconds", "usecs/call",
167 "calls", "errors", "syscall");
168 fprintf(outf, "%6.6s %11.11s %11.11s %9.9s %9.9s %s\n",
169 dashes, dashes, dashes, dashes, dashes, dashes);
170
171 sorted_count = xcalloc(sizeof(int), nsyscalls);
172 call_cum = error_cum = tv_cum.tv_sec = tv_cum.tv_usec = 0;
173 if (overhead.tv_sec == -1) {
174 tv_mul(&overhead, &shortest, 8);
175 tv_div(&overhead, &overhead, 10);
176 }
177 for (i = 0; i < nsyscalls; i++) {
178 sorted_count[i] = i;
179 if (counts == NULL || counts[i].calls == 0)
180 continue;
181 tv_mul(&dtv, &overhead, counts[i].calls);
182 tv_sub(&counts[i].time, &counts[i].time, &dtv);
183 call_cum += counts[i].calls;
184 error_cum += counts[i].errors;
185 tv_add(&tv_cum, &tv_cum, &counts[i].time);
186 }
187 float_tv_cum = tv_float(&tv_cum);
188 if (counts) {
189 if (sortfun)
190 qsort((void *) sorted_count, nsyscalls, sizeof(int), sortfun);
191 for (i = 0; i < nsyscalls; i++) {
192 double float_syscall_time;
193 int idx = sorted_count[i];
194 struct call_counts *cc = &counts[idx];
195 if (cc->calls == 0)
196 continue;
197 tv_div(&dtv, &cc->time, cc->calls);
198 error_str[0] = '\0';
199 if (cc->errors)
200 sprintf(error_str, "%u", cc->errors);
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, "%6.2f %11.6f %11lu %9u %9.9s %s\n",
207 percent, float_syscall_time,
208 (long) (1000000 * dtv.tv_sec + dtv.tv_usec),
209 cc->calls,
210 error_str, sysent[idx].sys_name);
211 }
212 }
213 free(sorted_count);
214
215 fprintf(outf, "%6.6s %11.11s %11.11s %9.9s %9.9s %s\n",
216 dashes, dashes, dashes, dashes, dashes, dashes);
217 error_str[0] = '\0';
218 if (error_cum)
219 sprintf(error_str, "%u", error_cum);
220 fprintf(outf, "%6.6s %11.6f %11.11s %9u %9.9s %s\n",
221 "100.00", float_tv_cum, "",
222 call_cum, error_str, "total");
223 }
224
225 void
call_summary(FILE * outf)226 call_summary(FILE *outf)
227 {
228 unsigned int i, old_pers = current_personality;
229
230 for (i = 0; i < SUPPORTED_PERSONALITIES; ++i) {
231 if (!countv[i])
232 continue;
233
234 if (current_personality != i)
235 set_personality(i);
236 if (i)
237 fprintf(outf,
238 "System call usage summary for %d bit mode:\n",
239 current_wordsize * 8);
240 call_summary_pers(outf);
241 }
242
243 if (old_pers != current_personality)
244 set_personality(old_pers);
245 }
246