/*
* Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
* Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
* Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
* Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
* Copyright (c) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Linux for s390 port by D.J. Barrow
* <barrow_dj@mail.yahoo.com,djbarrow@de.ibm.com>
* Copyright (c) 2004 Roland McGrath <roland@redhat.com>
* Copyright (c) 2006 Dmitry V. Levin <ldv@altlinux.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "defs.h"
/* Per-syscall stats structure */
struct call_counts {
/* time may be total latency or system time */
struct timeval time;
int calls, errors;
};
static struct call_counts *countv[SUPPORTED_PERSONALITIES];
#define counts (countv[current_personality])
static struct timeval shortest = { 1000000, 0 };
void
count_syscall(struct tcb *tcp, const struct timeval *syscall_exiting_tv)
{
struct timeval wtv;
struct timeval *tv = &wtv;
struct call_counts *cc;
unsigned long scno = tcp->scno;
if (!SCNO_IN_RANGE(scno))
return;
if (!counts) {
counts = calloc(nsyscalls, sizeof(*counts));
if (!counts)
die_out_of_memory();
}
cc = &counts[scno];
cc->calls++;
if (tcp->u_error)
cc->errors++;
/* tv = wall clock time spent while in syscall */
tv_sub(tv, syscall_exiting_tv, &tcp->etime);
/* Spent more wall clock time than spent system time? (usually yes) */
if (tv_cmp(tv, &tcp->dtime) > 0) {
static struct timeval one_tick = { -1, 0 };
if (one_tick.tv_sec == -1) {
/* Initialize it. */
struct itimerval it;
memset(&it, 0, sizeof it);
it.it_interval.tv_usec = 1;
setitimer(ITIMER_REAL, &it, NULL);
getitimer(ITIMER_REAL, &it);
one_tick = it.it_interval;
//FIXME: this hack doesn't work (tested on linux-3.6.11): one_tick = 0.000000
//tprintf(" one_tick.tv_usec:%u\n", (unsigned)one_tick.tv_usec);
}
if (tv_nz(&tcp->dtime))
/* tv = system time spent, if it isn't 0 */
tv = &tcp->dtime;
else if (tv_cmp(tv, &one_tick) > 0) {
/* tv = smallest "sane" time interval */
if (tv_cmp(&shortest, &one_tick) < 0)
tv = &shortest;
else
tv = &one_tick;
}
}
if (tv_cmp(tv, &shortest) < 0)
shortest = *tv;
tv_add(&cc->time, &cc->time, count_wallclock ? &wtv : tv);
}
static int
time_cmp(void *a, void *b)
{
return -tv_cmp(&counts[*((int *) a)].time,
&counts[*((int *) b)].time);
}
static int
syscall_cmp(void *a, void *b)
{
return strcmp(sysent[*((int *) a)].sys_name,
sysent[*((int *) b)].sys_name);
}
static int
count_cmp(void *a, void *b)
{
int m = counts[*((int *) a)].calls;
int n = counts[*((int *) b)].calls;
return (m < n) ? 1 : (m > n) ? -1 : 0;
}
static int (*sortfun)();
static struct timeval overhead = { -1, -1 };
void
set_sortby(const char *sortby)
{
if (strcmp(sortby, "time") == 0)
sortfun = time_cmp;
else if (strcmp(sortby, "calls") == 0)
sortfun = count_cmp;
else if (strcmp(sortby, "name") == 0)
sortfun = syscall_cmp;
else if (strcmp(sortby, "nothing") == 0)
sortfun = NULL;
else {
error_msg_and_die("invalid sortby: '%s'", sortby);
}
}
void set_overhead(int n)
{
overhead.tv_sec = n / 1000000;
overhead.tv_usec = n % 1000000;
}
static void
call_summary_pers(FILE *outf)
{
unsigned int i;
int call_cum, error_cum;
struct timeval tv_cum, dtv;
double float_tv_cum;
double percent;
const char *dashes = "----------------";
char error_str[sizeof(int)*3];
int *sorted_count;
fprintf(outf, "%6.6s %11.11s %11.11s %9.9s %9.9s %s\n",
"% time", "seconds", "usecs/call",
"calls", "errors", "syscall");
fprintf(outf, "%6.6s %11.11s %11.11s %9.9s %9.9s %s\n",
dashes, dashes, dashes, dashes, dashes, dashes);
sorted_count = calloc(sizeof(int), nsyscalls);
if (!sorted_count)
die_out_of_memory();
call_cum = error_cum = tv_cum.tv_sec = tv_cum.tv_usec = 0;
if (overhead.tv_sec == -1) {
tv_mul(&overhead, &shortest, 8);
tv_div(&overhead, &overhead, 10);
}
for (i = 0; i < nsyscalls; i++) {
sorted_count[i] = i;
if (counts == NULL || counts[i].calls == 0)
continue;
tv_mul(&dtv, &overhead, counts[i].calls);
tv_sub(&counts[i].time, &counts[i].time, &dtv);
call_cum += counts[i].calls;
error_cum += counts[i].errors;
tv_add(&tv_cum, &tv_cum, &counts[i].time);
}
float_tv_cum = tv_float(&tv_cum);
if (counts) {
if (sortfun)
qsort((void *) sorted_count, nsyscalls, sizeof(int), sortfun);
for (i = 0; i < nsyscalls; i++) {
double float_syscall_time;
int idx = sorted_count[i];
struct call_counts *cc = &counts[idx];
if (cc->calls == 0)
continue;
tv_div(&dtv, &cc->time, cc->calls);
error_str[0] = '\0';
if (cc->errors)
sprintf(error_str, "%u", cc->errors);
float_syscall_time = tv_float(&cc->time);
percent = (100.0 * float_syscall_time);
if (percent != 0.0)
percent /= float_tv_cum;
/* else: float_tv_cum can be 0.0 too and we get 0/0 = NAN */
fprintf(outf, "%6.2f %11.6f %11lu %9u %9.9s %s\n",
percent, float_syscall_time,
(long) (1000000 * dtv.tv_sec + dtv.tv_usec),
cc->calls,
error_str, sysent[idx].sys_name);
}
}
free(sorted_count);
fprintf(outf, "%6.6s %11.11s %11.11s %9.9s %9.9s %s\n",
dashes, dashes, dashes, dashes, dashes, dashes);
error_str[0] = '\0';
if (error_cum)
sprintf(error_str, "%u", error_cum);
fprintf(outf, "%6.6s %11.6f %11.11s %9u %9.9s %s\n",
"100.00", float_tv_cum, "",
call_cum, error_str, "total");
}
void
call_summary(FILE *outf)
{
unsigned int i, old_pers = current_personality;
for (i = 0; i < SUPPORTED_PERSONALITIES; ++i) {
if (!countv[i])
continue;
if (current_personality != i)
set_personality(i);
if (i)
fprintf(outf,
"System call usage summary for %d bit mode:\n",
current_wordsize * 8);
call_summary_pers(outf);
}
if (old_pers != current_personality)
set_personality(old_pers);
}