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 */
39struct call_counts {
40	/* time may be total latency or system time */
41	struct timeval time;
42	int calls, errors;
43};
44
45static struct call_counts *countv[SUPPORTED_PERSONALITIES];
46#define counts (countv[current_personality])
47
48static struct timeval shortest = { 1000000, 0 };
49
50void
51count_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
57	if (!scno_in_range(tcp->scno))
58		return;
59
60	if (!counts)
61		counts = xcalloc(nsyscalls, sizeof(*counts));
62	cc = &counts[tcp->scno];
63
64	cc->calls++;
65	if (syserror(tcp))
66		cc->errors++;
67
68	/* tv = wall clock time spent while in syscall */
69	tv_sub(tv, syscall_exiting_tv, &tcp->etime);
70
71	/* Spent more wall clock time than spent system time? (usually yes) */
72	if (tv_cmp(tv, &tcp->dtime) > 0) {
73		static struct timeval one_tick = { -1, 0 };
74
75		if (one_tick.tv_sec == -1) {
76			/* Initialize it.  */
77			struct itimerval it;
78
79			memset(&it, 0, sizeof it);
80			it.it_interval.tv_usec = 1;
81			setitimer(ITIMER_REAL, &it, NULL);
82			getitimer(ITIMER_REAL, &it);
83			one_tick = it.it_interval;
84//FIXME: this hack doesn't work (tested on linux-3.6.11): one_tick = 0.000000
85//tprintf(" one_tick.tv_usec:%u\n", (unsigned)one_tick.tv_usec);
86		}
87
88		if (tv_nz(&tcp->dtime))
89			/* tv = system time spent, if it isn't 0 */
90			tv = &tcp->dtime;
91		else if (tv_cmp(tv, &one_tick) > 0) {
92			/* tv = smallest "sane" time interval */
93			if (tv_cmp(&shortest, &one_tick) < 0)
94				tv = &shortest;
95			else
96				tv = &one_tick;
97		}
98	}
99	if (tv_cmp(tv, &shortest) < 0)
100		shortest = *tv;
101	tv_add(&cc->time, &cc->time, count_wallclock ? &wtv : tv);
102}
103
104static int
105time_cmp(void *a, void *b)
106{
107	return -tv_cmp(&counts[*((int *) a)].time,
108		       &counts[*((int *) b)].time);
109}
110
111static int
112syscall_cmp(void *a, void *b)
113{
114	const char *a_name = sysent[*((int *) a)].sys_name;
115	const char *b_name = sysent[*((int *) b)].sys_name;
116	return strcmp(a_name ? a_name : "", b_name ? b_name : "");
117}
118
119static int
120count_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
128static int (*sortfun)();
129static struct timeval overhead = { -1, -1 };
130
131void
132set_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
147void set_overhead(int n)
148{
149	overhead.tv_sec = n / 1000000;
150	overhead.tv_usec = n % 1000000;
151}
152
153static void
154call_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
225void
226call_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