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/* Copyright (C) 2011 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef PROF_LATENCY
#include <sys/resource.h>
#include <sys/socket.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <pthread.h>
/*! \brief Profiler statistics. */
typedef struct pstat_t {
double M; /*!< \brief Mean value. */
unsigned long min, max; /*!< \brief Minimum, maximum. */
unsigned long total; /*!< \brief Total profiled time. */
unsigned long count; /*!< \brief Number of profiled calls. */
} pstat_t;
/*! \brief Function call profile. */
typedef struct profile_t {
const char* call;
pstat_t stat;
} profile_t;
/*! \brief Observed function call codes. */
enum pcall_code_t {
PF_RECVFROM = 0,
PF_SENDTO,
PF_PTHREAD_MUTEX_LOCK,
PF_PTHREAD_MUTEX_UNLOCK,
PF_CALL_SIZE
} pcall_code_t;
/*! \brief Table of observed function calls. */
static profile_t table[] = {
{ "recvfrom", {0} },
{ "sendto", {0} },
{ "pthread_mutex_lock", {0} },
{ "pthread_mutex_unlock", {0} },
{ "NULL", {0} }
};
/*! \brief Add value to statistics. */
static inline void add_stat(pstat_t *stat, unsigned long val) {
if (val < stat->min) {
stat->min = val;
}
if (val > stat->max) {
stat->max = val;
}
stat->total += val;
double Mprev = stat->M, M = stat->M;
M += (val - M)/((double)stat->count + 1);
stat->M = M;
//S += (val - M)*(x[i] - Mprev);
++stat->count;
}
/*! \brief Call profiler table initialization (automatically called on load). */
void __attribute__ ((constructor)) profiler_init()
{
for (int i = 0; i < PF_CALL_SIZE; ++i) {
pstat_t* stat = &table[i].stat;
stat->M = 0;
stat->max = 0;
stat->min = (unsigned long)~0;
stat->total = 0;
stat->count = 0;
}
}
/*! \brief Call profiler table evaluation (automatically called on exit). */
void __attribute__ ((destructor)) profiler_deinit()
{
/* Get resource usage. */
struct rusage usage;
if (getrusage(RUSAGE_SELF, &usage) < 0) {
memset(&usage, 0, sizeof(struct rusage));
}
fprintf(stderr, "\nStatistics:");
fprintf(stderr, "\n==================\n");
fprintf(stderr, "User time: %.03lf ms\nSystem time: %.03lf ms\n",
usage.ru_utime.tv_sec * (double) 1000.0
+ usage.ru_utime.tv_usec / (double)1000.0,
usage.ru_stime.tv_sec * (double) 1000.0
+ usage.ru_stime.tv_usec / (double)1000.0);
fprintf(stderr, "Voluntary context switches: %lu\nInvoluntary context switches: %lu\n",
usage.ru_nvcsw,
usage.ru_nivcsw);
fprintf(stderr, "==================\n");
fprintf(stderr, "\n");
/* Callers statistics. */
for (int i = 0; i < PF_CALL_SIZE; ++i) {
pstat_t* stat = &table[i].stat;
fprintf(stderr, "%s: M=%lf min=%lu,max=%lu (total=%lu, %lu times) (usec)\n",
table[i].call, stat->M, stat->min, stat->max, stat->total,
stat->count);
}
}
ssize_t pf_recvfrom(int socket, void *buf, size_t len, int flags,
struct sockaddr *from, socklen_t *fromlen,
const char* caller, const char* file, int line)
{
unsigned long elapsed = 0;
int ret = 0;
perf_begin();
ret = recvfrom(socket, buf, len, flags, from, fromlen);
perf_end(elapsed);
/* Discard wakeup delays, count statistics otherwise. */
if (elapsed < 200000) {
add_stat(&table[PF_RECVFROM].stat, elapsed);
}
return ret;
}
ssize_t pf_sendto(int socket, const void *buf, size_t len, int flags,
const struct sockaddr *to, socklen_t tolen,
const char* caller, const char* file, int line)
{
unsigned long elapsed = 0;
int ret = 0;
perf_begin();
ret = sendto(socket, buf, len, flags, to, tolen);
perf_end(elapsed);
/* Discard wakeup delays, count statistics otherwise. */
if (elapsed < 200000) {
add_stat(&table[PF_SENDTO].stat, elapsed);
}
return ret;
}
/* Pthreads */
int pf_pthread_mutex_lock(pthread_mutex_t *mutex,
const char* caller, const char* file, int line)
{
unsigned long elapsed = 0;
int ret = 0;
perf_begin();
ret = pthread_mutex_lock(mutex);
perf_end(elapsed);
/* Discard wakeup delays, count statistics otherwise. */
if (elapsed < 200000) {
add_stat(&table[PF_PTHREAD_MUTEX_LOCK].stat, elapsed);
}
return ret;
}
int pf_pthread_mutex_unlock(pthread_mutex_t *mutex,
const char* caller, const char* file, int line)
{
unsigned long elapsed = 0;
int ret = 0;
perf_begin();
ret = pthread_mutex_unlock(mutex);
perf_end(elapsed);
/* Discard wakeup delays, count statistics otherwise. */
if (elapsed < 200000) {
add_stat(&table[PF_PTHREAD_MUTEX_UNLOCK].stat, elapsed);
}
return ret;
}
#endif // PROF_LATENCY
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