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/*
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* syst.c - example of a simple system wide monitoring program
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*
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* Copyright (c) 2010 Google, Inc
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* Contributed by Stephane Eranian <eranian@google.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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577717 |
* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
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* PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
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* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
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* OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <sys/types.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <errno.h>
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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include <err.h>
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#include <locale.h>
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#include <sys/ioctl.h>
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#include <time.h>
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#include "perf_util.h"
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#define MAX_GROUPS 256
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#define MAX_PATH 1024
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#ifndef STR
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# define _STR(x) #x
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# define STR(x) _STR(x)
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#endif
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typedef struct {
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const char *events[MAX_GROUPS];
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int nevents[MAX_GROUPS]; /* #events per group */
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int num_groups;
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int delay;
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int excl;
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int pin;
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int interval;
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int cpu;
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char *cgroup_name;
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} options_t;
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static options_t options;
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static perf_event_desc_t **all_fds;
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static int
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cgroupfs_find_mountpoint(char *buf, size_t maxlen)
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{
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FILE *fp;
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char mountpoint[MAX_PATH+1], tokens[MAX_PATH+1], type[MAX_PATH+1];
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char *token, *saved_ptr = NULL;
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int found = 0;
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fp = fopen("/proc/mounts", "r");
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if (!fp)
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return -1;
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/*
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* in order to handle split hierarchy, we need to scan /proc/mounts
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* and inspect every cgroupfs mount point to find one that has
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* perf_event subsystem
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*/
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while (fscanf(fp, "%*s %"STR(MAX_PATH)"s %"STR(MAX_PATH)"s %"
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STR(MAX_PATH)"s %*d %*d\n",
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mountpoint, type, tokens) == 3) {
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if (!strcmp(type, "cgroup")) {
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token = strtok_r(tokens, ",", &saved_ptr);
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while (token != NULL) {
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if (!strcmp(token, "perf_event")) {
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found = 1;
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break;
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}
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token = strtok_r(NULL, ",", &saved_ptr);
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}
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}
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if (found)
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break;
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}
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fclose(fp);
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if (!found)
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return -1;
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if (strlen(mountpoint) < maxlen) {
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strcpy(buf, mountpoint);
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return 0;
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}
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return -1;
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}
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int
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open_cgroup(char *name)
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{
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char path[MAX_PATH+1];
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char mnt[MAX_PATH+1];
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int cfd;
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if (cgroupfs_find_mountpoint(mnt, MAX_PATH+1))
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errx(1, "cannot find cgroup fs mount point");
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snprintf(path, MAX_PATH, "%s/%s", mnt, name);
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cfd = open(path, O_RDONLY);
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if (cfd == -1)
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warn("no access to cgroup %s\n", name);
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return cfd;
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}
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void
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setup_cpu(int cpu, int cfd)
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{
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perf_event_desc_t *fds = NULL;
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int old_total, total = 0, num;
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int i, j, n, ret, is_lead, group_fd;
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unsigned long flags;
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pid_t pid;
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for(i=0, j=0; i < options.num_groups; i++) {
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old_total = total;
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ret = perf_setup_list_events(options.events[i], &fds, &total);
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if (ret)
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errx(1, "cannot setup events\n");
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all_fds[cpu] = fds;
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num = total - old_total;
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options.nevents[i] = num;
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for(n=0; n < num; n++, j++) {
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is_lead = perf_is_group_leader(fds, j);
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if (is_lead) {
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fds[j].hw.disabled = 1;
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group_fd = -1;
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} else {
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fds[j].hw.disabled = 0;
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group_fd = fds[fds[j].group_leader].fd;
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}
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fds[j].hw.size = sizeof(struct perf_event_attr);
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if (options.cgroup_name) {
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flags = PERF_FLAG_PID_CGROUP;
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pid = cfd;
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//fds[j].hw.cgroup = 1;
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//fds[j].hw.cgroup_fd = cfd;
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} else {
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flags = 0;
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pid = -1;
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}
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if (options.pin && is_lead)
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fds[j].hw.pinned = 1;
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577717 |
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if (options.excl && is_lead)
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|
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577717 |
fds[j].hw.exclusive = 1;
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|
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577717 |
|
|
Packit |
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/* request timing information necessary for scaling counts */
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|
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577717 |
fds[j].hw.read_format = PERF_FORMAT_SCALE;
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|
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577717 |
fds[j].fd = perf_event_open(&fds[j].hw, pid, cpu, group_fd, flags);
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|
Packit |
577717 |
if (fds[j].fd == -1) {
|
|
Packit |
577717 |
if (errno == EACCES)
|
|
Packit |
577717 |
err(1, "you need to be root to run system-wide on this machine");
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|
Packit |
577717 |
|
|
Packit |
577717 |
warn("cannot attach event %s to CPU%ds, aborting", fds[j].name, cpu);
|
|
Packit |
577717 |
exit(1);
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
}
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|
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577717 |
|
|
Packit |
577717 |
void start_cpu(int c)
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|
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577717 |
{
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|
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577717 |
perf_event_desc_t *fds = NULL;
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Packit |
577717 |
int j, ret, n = 0;
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Packit |
577717 |
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577717 |
fds = all_fds[c];
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577717 |
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Packit |
577717 |
if (fds[0].fd == -1)
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Packit |
577717 |
return;
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|
Packit |
577717 |
|
|
Packit |
577717 |
for(j=0; j < options.num_groups; j++) {
|
|
Packit |
577717 |
/* group leader always first in each group */
|
|
Packit |
577717 |
ret = ioctl(fds[n].fd, PERF_EVENT_IOC_ENABLE, 0);
|
|
Packit |
577717 |
if (ret)
|
|
Packit |
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err(1, "cannot enable event %s\n", fds[j].name);
|
|
Packit |
577717 |
n += options.nevents[j];
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
void stop_cpu(int c)
|
|
Packit |
577717 |
{
|
|
Packit |
577717 |
perf_event_desc_t *fds = NULL;
|
|
Packit |
577717 |
int j, ret, n = 0;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
fds = all_fds[c];
|
|
Packit |
577717 |
|
|
Packit |
577717 |
if (fds[0].fd == -1)
|
|
Packit |
577717 |
return;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
for(j=0; j < options.num_groups; j++) {
|
|
Packit |
577717 |
/* group leader always first in each group */
|
|
Packit |
577717 |
ret = ioctl(fds[n].fd, PERF_EVENT_IOC_DISABLE, 0);
|
|
Packit |
577717 |
if (ret)
|
|
Packit |
577717 |
err(1, "cannot disable event %s\n", fds[j].name);
|
|
Packit |
577717 |
n += options.nevents[j];
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
void read_cpu(int c)
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|
Packit |
577717 |
{
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|
Packit |
577717 |
perf_event_desc_t *fds;
|
|
Packit |
577717 |
uint64_t val, delta;
|
|
Packit |
577717 |
double ratio;
|
|
Packit |
577717 |
int i, j, n, ret;
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|
Packit |
577717 |
|
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Packit |
577717 |
fds = all_fds[c];
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|
Packit |
577717 |
|
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Packit |
577717 |
if (fds[0].fd == -1) {
|
|
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577717 |
printf("CPU%d not monitored\n", c);
|
|
Packit |
577717 |
return;
|
|
Packit |
577717 |
}
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|
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|
|
Packit |
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for(i=0, j = 0; i < options.num_groups; i++) {
|
|
Packit |
577717 |
for(n = 0; n < options.nevents[i]; n++, j++) {
|
|
Packit |
577717 |
|
|
Packit |
577717 |
ret = read(fds[j].fd, fds[j].values, sizeof(fds[j].values));
|
|
Packit |
577717 |
if (ret != sizeof(fds[j].values)) {
|
|
Packit |
577717 |
if (ret == -1)
|
|
Packit |
577717 |
err(1, "cannot read event %s : %d", fds[j].name, ret);
|
|
Packit |
577717 |
else {
|
|
Packit |
577717 |
warnx("CPU%d G%-2d could not read event %s, read=%d", c, i, fds[j].name, ret);
|
|
Packit |
577717 |
continue;
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* scaling because we may be sharing the PMU and
|
|
Packit |
577717 |
* thus may be multiplexed
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
delta = perf_scale_delta(fds[j].values, fds[j].prev_values);
|
|
Packit |
577717 |
val = perf_scale(fds[j].values);
|
|
Packit |
577717 |
ratio = perf_scale_ratio(fds[j].values);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
printf("CPU%-3d G%-2d %'20"PRIu64" %'20"PRIu64" %s (scaling %.2f%%, ena=%'"PRIu64", run=%'"PRIu64") %s\n",
|
|
Packit |
577717 |
c,
|
|
Packit |
577717 |
i,
|
|
Packit |
577717 |
val,
|
|
Packit |
577717 |
delta,
|
|
Packit |
577717 |
fds[j].name,
|
|
Packit |
577717 |
(1.0-ratio)*100,
|
|
Packit |
577717 |
fds[j].values[1],
|
|
Packit |
577717 |
fds[j].values[2],
|
|
Packit |
577717 |
options.cgroup_name ? options.cgroup_name : "");
|
|
Packit |
577717 |
|
|
Packit |
577717 |
fds[j].prev_values[0] = fds[j].values[0];
|
|
Packit |
577717 |
fds[j].prev_values[1] = fds[j].values[1];
|
|
Packit |
577717 |
fds[j].prev_values[2] = fds[j].values[2];
|
|
Packit |
577717 |
|
|
Packit |
577717 |
if (fds[j].values[2] > fds[j].values[1])
|
|
Packit |
577717 |
errx(1, "WARNING: time_running > time_enabled %"PRIu64"\n", fds[j].values[2] - fds[j].values[1]);
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
void close_cpu(int c)
|
|
Packit |
577717 |
{
|
|
Packit |
577717 |
perf_event_desc_t *fds = NULL;
|
|
Packit |
577717 |
int i, j;
|
|
Packit |
577717 |
int total = 0;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
fds = all_fds[c];
|
|
Packit |
577717 |
|
|
Packit |
577717 |
if (fds[0].fd == -1)
|
|
Packit |
577717 |
return;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
for(i=0; i < options.num_groups; i++) {
|
|
Packit |
577717 |
for(j=0; j < options.nevents[i]; j++)
|
|
Packit |
577717 |
close(fds[j].fd);
|
|
Packit |
577717 |
total += options.nevents[i];
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
perf_free_fds(fds, total);
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
void
|
|
Packit |
577717 |
measure(void)
|
|
Packit |
577717 |
{
|
|
Packit |
577717 |
int c, cmin, cmax, ncpus;
|
|
Packit |
577717 |
int cfd = -1;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
cmin = 0;
|
|
Packit |
577717 |
cmax = (int)sysconf(_SC_NPROCESSORS_ONLN);
|
|
Packit |
577717 |
ncpus = cmax;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
if (options.cpu != -1) {
|
|
Packit |
577717 |
cmin = options.cpu;
|
|
Packit |
577717 |
cmax = cmin + 1;
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
all_fds = malloc(ncpus * sizeof(perf_event_desc_t *));
|
|
Packit |
577717 |
if (!all_fds)
|
|
Packit |
577717 |
err(1, "cannot allocate memory for all_fds");
|
|
Packit |
577717 |
|
|
Packit |
577717 |
if (options.cgroup_name) {
|
|
Packit |
577717 |
cfd = open_cgroup(options.cgroup_name);
|
|
Packit |
577717 |
if (cfd == -1)
|
|
Packit |
577717 |
exit(1);
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
for(c=cmin ; c < cmax; c++)
|
|
Packit |
577717 |
setup_cpu(c, cfd);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
if (options.cgroup_name)
|
|
Packit |
577717 |
close(cfd);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
printf("<press CTRL-C to quit before %ds time limit>\n", options.delay);
|
|
Packit |
577717 |
/*
|
|
Packit |
577717 |
* FIX this for hotplug CPU
|
|
Packit |
577717 |
*/
|
|
Packit |
577717 |
|
|
Packit |
577717 |
if (options.interval) {
|
|
Packit |
577717 |
struct timespec tv;
|
|
Packit |
577717 |
int delay;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
for (delay = 1 ; delay <= options.delay; delay++) {
|
|
Packit |
577717 |
|
|
Packit |
577717 |
for(c=cmin ; c < cmax; c++)
|
|
Packit |
577717 |
start_cpu(c);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
if (0) {
|
|
Packit |
577717 |
tv.tv_sec = 0;
|
|
Packit |
577717 |
tv.tv_nsec = 100000000;
|
|
Packit |
577717 |
nanosleep(&tv, NULL);
|
|
Packit |
577717 |
} else
|
|
Packit |
577717 |
sleep(1);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
for(c=cmin ; c < cmax; c++)
|
|
Packit |
577717 |
stop_cpu(c);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
for(c = cmin; c < cmax; c++) {
|
|
Packit |
577717 |
printf("# %'ds -----\n", delay);
|
|
Packit |
577717 |
read_cpu(c);
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
} else {
|
|
Packit |
577717 |
for(c=cmin ; c < cmax; c++)
|
|
Packit |
577717 |
start_cpu(c);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
sleep(options.delay);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
if (0)
|
|
Packit |
577717 |
for(c=cmin ; c < cmax; c++)
|
|
Packit |
577717 |
stop_cpu(c);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
for(c = cmin; c < cmax; c++) {
|
|
Packit |
577717 |
printf("# -----\n");
|
|
Packit |
577717 |
read_cpu(c);
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
for(c = cmin; c < cmax; c++)
|
|
Packit |
577717 |
close_cpu(c);
|
|
Packit |
577717 |
|
|
Packit |
577717 |
free(all_fds);
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
static void
|
|
Packit |
577717 |
usage(void)
|
|
Packit |
577717 |
{
|
|
Packit |
577717 |
printf("usage: syst [-c cpu] [-x] [-h] [-p] [-d delay] [-P] [-G cgroup name] [-e event1,event2,...]\n");
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
int
|
|
Packit |
577717 |
main(int argc, char **argv)
|
|
Packit |
577717 |
{
|
|
Packit |
577717 |
int c, ret;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
setlocale(LC_ALL, "");
|
|
Packit |
577717 |
|
|
Packit |
577717 |
options.cpu = -1;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
while ((c=getopt(argc, argv,"hc:e:d:xPpG:")) != -1) {
|
|
Packit |
577717 |
switch(c) {
|
|
Packit |
577717 |
case 'x':
|
|
Packit |
577717 |
options.excl = 1;
|
|
Packit |
577717 |
break;
|
|
Packit |
577717 |
case 'p':
|
|
Packit |
577717 |
options.interval = 1;
|
|
Packit |
577717 |
break;
|
|
Packit |
577717 |
case 'e':
|
|
Packit |
577717 |
if (options.num_groups < MAX_GROUPS) {
|
|
Packit |
577717 |
options.events[options.num_groups++] = optarg;
|
|
Packit |
577717 |
} else {
|
|
Packit |
577717 |
errx(1, "you cannot specify more than %d groups.\n",
|
|
Packit |
577717 |
MAX_GROUPS);
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
break;
|
|
Packit |
577717 |
case 'c':
|
|
Packit |
577717 |
options.cpu = atoi(optarg);
|
|
Packit |
577717 |
break;
|
|
Packit |
577717 |
case 'd':
|
|
Packit |
577717 |
options.delay = atoi(optarg);
|
|
Packit |
577717 |
break;
|
|
Packit |
577717 |
case 'P':
|
|
Packit |
577717 |
options.pin = 1;
|
|
Packit |
577717 |
break;
|
|
Packit |
577717 |
case 'h':
|
|
Packit |
577717 |
usage();
|
|
Packit |
577717 |
exit(0);
|
|
Packit |
577717 |
case 'G':
|
|
Packit |
577717 |
options.cgroup_name = optarg;
|
|
Packit |
577717 |
break;
|
|
Packit |
577717 |
default:
|
|
Packit |
577717 |
errx(1, "unknown error");
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
if (!options.delay)
|
|
Packit |
577717 |
options.delay = 20;
|
|
Packit |
577717 |
|
|
Packit |
577717 |
if (!options.events[0]) {
|
|
Packit |
577717 |
options.events[0] = "cycles,instructions";
|
|
Packit |
577717 |
options.num_groups = 1;
|
|
Packit |
577717 |
}
|
|
Packit |
577717 |
|
|
Packit |
577717 |
ret = pfm_initialize();
|
|
Packit |
577717 |
if (ret != PFM_SUCCESS)
|
|
Packit |
577717 |
errx(1, "libpfm initialization failed: %s\n", pfm_strerror(ret));
|
|
Packit |
577717 |
|
|
Packit |
577717 |
measure();
|
|
Packit |
577717 |
|
|
Packit |
577717 |
/* free libpfm resources cleanly */
|
|
Packit |
577717 |
pfm_terminate();
|
|
Packit |
577717 |
|
|
Packit |
577717 |
return 0;
|
|
Packit |
577717 |
}
|