/*
* Assumes the cgroup is already mounted at /cgroup/memory/a
*
* Assumes some processes are already in the cgroup
*
* Assumes it is the memory controller is mounted in at that
* point
*/
int main()
{
int size;
pid_t *pids;
int ret;
int i;
ret = cgroup_init();
if (ret) {
printf("FAIL: cgroup_init failed with %s\n", cgroup_strerror(ret));
exit(3);
}
ret = cgroup_get_procs("a", "memory", &pids, &size);
if (ret) {
printf("FAIL: cgroup_get_procs failed with %s\n", cgroup_strerror(ret));
exit(3);
}
for (i = 0; i < size; i++)
printf("%u\n", pids[i]);
return 0;
}
/*
* Read the proc statistics information of given group name.
*
* IN:
* @group_name : The given group name.
* @stats_lists: The lists of proc statistics information.
*
* RETURN
* 0 Success.
* -1 Failed.
*/
int read_cg_proc_stats(const char* group_name, cg_proc_stats_lists* stats_lists) {
FILE *fp = NULL;
int i = 0, j = 0, num = 0;
char* pre = NULL;
pid_t* procs;
char proc_name[FN_LEN] = { 0 };
char line[MAX_LINE_LEN] = { 0 };
cg_proc_stats* cg_stats = NULL;
if (!group_name || !stats_lists) {
#ifdef DEBUG
fprintf(stderr,
"rd_stats: the group name or io stats lists is null.\n");
#endif
return -1;
}
/** Clear the history information.*/
clear_proc_stats(stats_lists);
/** Get all of the process id in the group. But the variables procs should
* be free at the end of this procedure.*/
if (cgroup_get_procs(group_name, CG_CPUSET, &procs, &j)) {
#ifdef DEBUG
fprintf(stderr,
"rd_stats: read the value of procs in cpuset %s failed\n",
group_name);
#endif
return -1;
}
/** Read the io statistics information of each process id(/proc/<PID>/io).
* Initialized the io statistics information and store the value of the
* parameter. Finally add the io statistics information into the lists.*/
for (i = 0; i < j; i++) {
/** Initialized the io statistics information.*/
if (init_proc_stats(&cg_stats, procs[i])) {
fprintf(stderr, "rd_stats: initialize the io stats failed\n");
goto err;
}
if (read_proc_io(cg_stats->io_stats, procs[i])
|| read_proc_stat(cg_stats->proc_stat, procs[i])
|| read_proc_statm(cg_stats->proc_statm, procs[i])) {
#ifdef DEBUG
fprintf(stderr, "rd_stats: read the proc io stats, proc"
" stat and proc statm into io stats list failed\n");
#endif
goto err;
}
/** Add the io statistics information into the lists.*/
if (add_proc_stats(stats_lists, cg_stats)) {
#ifdef DEBUG
fprintf(stderr,
"rd_stats: add the io stats into io stats list failed\n");
#endif
goto err;
}
}
if (procs)
free(procs);
return 0;
err: if (cg_stats)
uninit_proc_stats(cg_stats);
clear_proc_stats(stats_lists);
if (procs)
free(procs);
if (fp)
fclose(fp);
return -1;
}
