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pidstat.c
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/*
* pidstat: Report statistics for Linux tasks
* (C) 2007-2014 by Sebastien GODARD (sysstat <at> orange.fr)
*
***************************************************************************
* 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 2 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 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, write to the Free Software Foundation, Inc., *
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA *
***************************************************************************
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <dirent.h>
#include <ctype.h>
#include <sys/types.h>
#include <pwd.h>
#include <sys/utsname.h>
#include <regex.h>
#include <linux/sched.h>
#include "version.h"
#include "pidstat.h"
#include "common.h"
#include "rd_stats.h"
#include "count.h"
#ifdef USE_NLS
#include <locale.h>
#include <libintl.h>
#define _(string) gettext(string)
#else
#define _(string) (string)
#endif
#define SCCSID "@(#)sysstat-" VERSION ": " __FILE__ " compiled " __DATE__ " " __TIME__
char *sccsid(void) { return (SCCSID); }
unsigned long long uptime[3] = {0, 0, 0};
unsigned long long uptime0[3] = {0, 0, 0};
struct pid_stats *st_pid_list[3] = {NULL, NULL, NULL};
unsigned int *pid_array = NULL;
struct pid_stats st_pid_null;
struct tm ps_tstamp[3];
char commstr[MAX_COMM_LEN];
char userstr[MAX_USER_LEN];
char procstr[MAX_COMM_LEN];
int show_threads = FALSE;
unsigned int pid_nr = 0; /* Nb of PID to display */
unsigned int pid_array_nr = 0;
int cpu_nr = 0; /* Nb of processors on the machine */
unsigned long tlmkb; /* Total memory in kB */
long interval = -1;
long count = 0;
unsigned int pidflag = 0; /* General flags */
unsigned int tskflag = 0; /* TASK/CHILD stats */
unsigned int actflag = 0; /* Activity flag */
struct sigaction alrm_act, int_act;
int sigint_caught = 0;
/*
***************************************************************************
* Print usage and exit.
*
* IN:
* @progname Name of sysstat command
***************************************************************************
*/
void usage(char *progname)
{
fprintf(stderr, _("Usage: %s [ options ] [ <interval> [ <count> ] ]\n"),
progname);
fprintf(stderr, _("Options are:\n"
"[ -d ] [ -h ] [ -I ] [ -l ] [ -R ] [ -r ] [ -s ] [ -t ] [ -U [ <username> ] ]\n"
"[ -u ] [ -V ] [ -v ] [ -w ] [ -C <command> ] [ -G <process_name> ]\n"
"[ -p { <pid> [,...] | SELF | ALL } ] [ -T { TASK | CHILD | ALL } ]\n"));
exit(1);
}
/*
***************************************************************************
* SIGALRM signal handler. No need to resert the handler here.
*
* IN:
* @sig Signal number.
***************************************************************************
*/
void alarm_handler(int sig)
{
alarm(interval);
}
/*
***************************************************************************
* SIGINT signal handler.
*
* IN:
* @sig Signal number.
***************************************************************************
*/
void int_handler(int sig)
{
sigint_caught = 1;
}
/*
***************************************************************************
* Initialize uptime variables.
***************************************************************************
*/
void init_stats(void)
{
memset(&st_pid_null, 0, PID_STATS_SIZE);
}
/*
***************************************************************************
* Allocate structures for PIDs entered on command line.
*
* IN:
* @len Number of PIDs entered on the command line.
***************************************************************************
*/
void salloc_pid_array(unsigned int len)
{
if ((pid_array = (unsigned int *) malloc(sizeof(unsigned int) * len)) == NULL) {
perror("malloc");
exit(4);
}
memset(pid_array, 0, sizeof(int) * len);
}
/*
***************************************************************************
* Allocate structures for PIDs to read.
*
* IN:
* @len Number of PIDs (and TIDs) on the system.
***************************************************************************
*/
void salloc_pid(unsigned int len)
{
int i;
for (i = 0; i < 3; i++) {
if ((st_pid_list[i] = (struct pid_stats *) malloc(PID_STATS_SIZE * len)) == NULL) {
perror("malloc");
exit(4);
}
memset(st_pid_list[i], 0, PID_STATS_SIZE * len);
}
}
/*
***************************************************************************
* Free PID list structures.
***************************************************************************
*/
void sfree_pid(void)
{
int i;
for (i = 0; i < 3; i++) {
free(st_pid_list[i]);
}
}
/*
***************************************************************************
* Check flags and set default values.
***************************************************************************
*/
void check_flags(void)
{
unsigned int act = 0;
/* Display CPU usage for active tasks by default */
if (!actflag) {
actflag |= P_A_CPU;
}
if (!DISPLAY_PID(pidflag)) {
pidflag |= P_D_ACTIVE_PID + P_D_PID + P_D_ALL_PID;
}
if (!tskflag) {
tskflag |= P_TASK;
}
/* Check that requested activities are available */
if (DISPLAY_TASK_STATS(tskflag)) {
act |= P_A_CPU + P_A_MEM + P_A_IO + P_A_CTXSW
+ P_A_STACK + P_A_KTAB + P_A_RT;
}
if (DISPLAY_CHILD_STATS(tskflag)) {
act |= P_A_CPU + P_A_MEM;
}
actflag &= act;
if (!actflag) {
fprintf(stderr, _("Requested activities not available\n"));
exit(1);
}
}
/*
***************************************************************************
* Look for the PID in the list of PIDs entered on the command line, and
* store it if necessary.
*
* IN:
* @pid_array_nr Length of the PID list.
* @pid PID to search.
*
* OUT:
* @pid_array_nr New length of the PID list.
*
* RETURNS:
* Returns the position of the PID in the list.
***************************************************************************
*/
int update_pid_array(unsigned int *pid_array_nr, unsigned int pid)
{
unsigned int i;
for (i = 0; i < *pid_array_nr; i++) {
if (pid_array[i] == pid)
break;
}
if (i == *pid_array_nr) {
/* PID not found: Store it */
(*pid_array_nr)++;
pid_array[i] = pid;
}
return i;
}
/*
***************************************************************************
* Display process command name or command line.
*
* IN:
* @pst Pointer on structure with process stats and command line.
***************************************************************************
*/
void print_comm(struct pid_stats *pst)
{
char *p;
if (DISPLAY_CMDLINE(pidflag) && strlen(pst->cmdline)) {
p = pst->cmdline;
}
else {
p = pst->comm;
}
printf(" %s%s\n", pst->tgid ? "|__" : "", p);
}
/*
***************************************************************************
* Read /proc/meminfo.
***************************************************************************
*/
void read_proc_meminfo(void)
{
struct stats_memory st_mem;
memset(&st_mem, 0, STATS_MEMORY_SIZE);
read_meminfo(&st_mem);
tlmkb = st_mem.tlmkb;
}
/*
***************************************************************************
* Read stats from /proc/#[/task/##]/stat.
*
* IN:
* @pid Process whose stats are to be read.
* @pst Pointer on structure where stats will be saved.
* @tgid If !=0, thread whose stats are to be read.
*
* OUT:
* @pst Pointer on structure where stats have been saved.
* @thread_nr Number of threads of the process.
*
* RETURNS:
* 0 if stats have been successfully read, and 1 otherwise.
***************************************************************************
*/
int read_proc_pid_stat(unsigned int pid, struct pid_stats *pst,
unsigned int *thread_nr, unsigned int tgid)
{
int fd, sz, rc, commsz;
char filename[128];
static char buffer[1024 + 1];
char *start, *end;
if (tgid) {
sprintf(filename, TASK_STAT, tgid, pid);
}
else {
sprintf(filename, PID_STAT, pid);
}
if ((fd = open(filename, O_RDONLY)) < 0)
/* No such process */
return 1;
sz = read(fd, buffer, 1024);
close(fd);
if (sz <= 0)
return 1;
buffer[sz] = '\0';
if ((start = strchr(buffer, '(')) == NULL)
return 1;
start += 1;
if ((end = strrchr(start, ')')) == NULL)
return 1;
commsz = end - start;
if (commsz >= MAX_COMM_LEN)
return 1;
memcpy(pst->comm, start, commsz);
pst->comm[commsz] = '\0';
start = end + 2;
rc = sscanf(start,
"%*s %*d %*d %*d %*d %*d %*u %llu %llu"
" %llu %llu %llu %llu %lld %lld %*d %*d %u %*u %*d %llu %llu"
" %*u %*u %*u %*u %*u %*u %*u %*u %*u %*u %*u %*u %*u"
" %*u %u %u %u %llu %llu %lld\n",
&pst->minflt, &pst->cminflt, &pst->majflt, &pst->cmajflt,
&pst->utime, &pst->stime, &pst->cutime, &pst->cstime,
thread_nr, &pst->vsz, &pst->rss, &pst->processor,
&pst->priority, &pst->policy,
&pst->blkio_swapin_delays, &pst->gtime, &pst->cgtime);
if (rc < 15)
return 1;
if (rc < 17) {
/* gtime and cgtime fields are unavailable in file */
pst->gtime = pst->cgtime = 0;
}
/* Convert to kB */
pst->vsz >>= 10;
pst->rss = PG_TO_KB(pst->rss);
pst->pid = pid;
pst->tgid = tgid;
return 0;
}
/*
*****************************************************************************
* Read stats from /proc/#[/task/##]/status.
*
* IN:
* @pid Process whose stats are to be read.
* @pst Pointer on structure where stats will be saved.
* @tgid If !=0, thread whose stats are to be read.
*
* OUT:
* @pst Pointer on structure where stats have been saved.
*
* RETURNS:
* 0 if stats have been successfully read, and 1 otherwise.
*****************************************************************************
*/
int read_proc_pid_status(unsigned int pid, struct pid_stats *pst,
unsigned int tgid)
{
FILE *fp;
char filename[128], line[256];
if (tgid) {
sprintf(filename, TASK_STATUS, tgid, pid);
}
else {
sprintf(filename, PID_STATUS, pid);
}
if ((fp = fopen(filename, "r")) == NULL)
/* No such process */
return 1;
while (fgets(line, sizeof(line), fp) != NULL) {
if (!strncmp(line, "Uid:", 4)) {
sscanf(line + 5, "%u", &pst->uid);
}
else if (!strncmp(line, "Threads:", 8)) {
sscanf(line + 9, "%u", &pst->threads);
}
else if (!strncmp(line, "voluntary_ctxt_switches:", 24)) {
sscanf(line + 25, "%lu", &pst->nvcsw);
}
else if (!strncmp(line, "nonvoluntary_ctxt_switches:", 27)) {
sscanf(line + 28, "%lu", &pst->nivcsw);
}
}
fclose(fp);
pst->pid = pid;
pst->tgid = tgid;
return 0;
}
/*
*****************************************************************************
* Read information from /proc/#[/task/##}/smaps.
*
* @pid Process whose stats are to be read.
* @pst Pointer on structure where stats will be saved.
* @tgid If !=0, thread whose stats are to be read.
*
* OUT:
* @pst Pointer on structure where stats have been saved.
*
* RETURNS:
* 0 if stats have been successfully read, and 1 otherwise.
*****************************************************************************
*/
int read_proc_pid_smap(unsigned int pid, struct pid_stats *pst, unsigned int tgid)
{
FILE *fp;
char filename[128], line[256];
int state = 0;
if (tgid) {
sprintf(filename, TASK_SMAP, tgid, pid);
}
else {
sprintf(filename, PID_SMAP, pid);
}
if ((fp = fopen(filename, "rt")) == NULL)
/* No such process */
return 1;
while ((state < 3) && (fgets(line, sizeof(line), fp) != NULL)) {
switch (state) {
case 0:
if (strstr(line, "[stack]")) {
state = 1;
}
break;
case 1:
if (strstr(line, "Size:")) {
sscanf(line + sizeof("Size:"), "%lu", &pst->stack_size);
state = 2;
}
break;
case 2:
if (strstr(line, "Referenced:")) {
sscanf(line + sizeof("Referenced:"), "%lu", &pst->stack_ref);
state = 3;
}
break;
}
}
fclose(fp);
pst->pid = pid;
pst->tgid = tgid;
return 0;
}
/*
*****************************************************************************
* Read process command line from /proc/#[/task/##]/cmdline.
*
* IN:
* @pid Process whose command line is to be read.
* @pst Pointer on structure where command line will be saved.
* @tgid If !=0, thread whose command line is to be read.
*
* OUT:
* @pst Pointer on structure where command line has been saved.
*
* RETURNS:
* 0 if command line has been successfully read, and 1 otherwise (the process
* has terminated or its /proc/.../cmdline file is just empty).
*****************************************************************************
*/
int read_proc_pid_cmdline(unsigned int pid, struct pid_stats *pst,
unsigned int tgid)
{
FILE *fp;
char filename[128], line[MAX_CMDLINE_LEN];
size_t len;
int i;
if (tgid) {
sprintf(filename, TASK_CMDLINE, tgid, pid);
}
else {
sprintf(filename, PID_CMDLINE, pid);
}
if ((fp = fopen(filename, "r")) == NULL)
/* No such process */
return 1;
memset(line, 0, MAX_CMDLINE_LEN);
if ((len = fread(line, 1, MAX_CMDLINE_LEN - 1, fp)) == 0) {
/* Nothing to read doesn't mean that process no longer exists */
fclose(fp);
return 1;
}
for (i = 0; i < len; i++) {
if (line[i] == '\0') {
line[i] = ' ';
}
}
fclose(fp);
strncpy(pst->cmdline, line, MAX_CMDLINE_LEN - 1);
pst->cmdline[MAX_CMDLINE_LEN - 1] = '\0';
return 0;
}
/*
***************************************************************************
* Read stats from /proc/#[/task/##]/io.
*
* IN:
* @pid Process whose stats are to be read.
* @pst Pointer on structure where stats will be saved.
* @tgid If !=0, thread whose stats are to be read.
*
* OUT:
* @pst Pointer on structure where stats have been saved.
*
* RETURNS:
* 0 if stats have been successfully read.
* Also returns 0 if current process has terminated or if its io file
* doesn't exist, but in this case, set process' F_NO_PID_IO flag to
* indicate that I/O stats should no longer be read for it.
***************************************************************************
*/
int read_proc_pid_io(unsigned int pid, struct pid_stats *pst,
unsigned int tgid)
{
FILE *fp;
char filename[128], line[256];
if (tgid) {
sprintf(filename, TASK_IO, tgid, pid);
}
else {
sprintf(filename, PID_IO, pid);
}
if ((fp = fopen(filename, "r")) == NULL) {
/* No such process... or file non existent! */
pst->flags |= F_NO_PID_IO;
/*
* Also returns 0 since io stats file doesn't necessarily exist,
* depending on the kernel version used.
*/
return 0;
}
while (fgets(line, sizeof(line), fp) != NULL) {
if (!strncmp(line, "read_bytes:", 11)) {
sscanf(line + 12, "%llu", &pst->read_bytes);
}
else if (!strncmp(line, "write_bytes:", 12)) {
sscanf(line + 13, "%llu", &pst->write_bytes);
}
else if (!strncmp(line, "cancelled_write_bytes:", 22)) {
sscanf(line + 23, "%llu", &pst->cancelled_write_bytes);
}
}
fclose(fp);
pst->pid = pid;
pst->tgid = tgid;
pst->flags &= ~F_NO_PID_IO;
return 0;
}
/*
***************************************************************************
* Count number of file descriptors in /proc/#[/task/##]/fd directory.
*
* IN:
* @pid Process whose stats are to be read.
* @pst Pointer on structure where stats will be saved.
* @tgid If !=0, thread whose stats are to be read.
*
* OUT:
* @pst Pointer on structure where stats have been saved.
*
* RETURNS:
* 0 if stats have been successfully read.
* Also returns 0 if current process has terminated or if we cannot read its
* fd directory, but in this case, set process' F_NO_PID_FD flag to
* indicate that fd directory couldn't be read.
***************************************************************************
*/
int read_proc_pid_fd(unsigned int pid, struct pid_stats *pst,
unsigned int tgid)
{
DIR *dir;
struct dirent *drp;
char filename[128];
if (tgid) {
sprintf(filename, TASK_FD, tgid, pid);
}
else {
sprintf(filename, PID_FD, pid);
}
if ((dir = opendir(filename)) == NULL) {
/* Cannot read fd directory */
pst->flags |= F_NO_PID_FD;
return 0;
}
pst->fd_nr = 0;
/* Count number of entries if fd directory */
while ((drp = readdir(dir)) != NULL) {
if (isdigit(drp->d_name[0])) {
(pst->fd_nr)++;
}
}
closedir(dir);
pst->pid = pid;
pst->tgid = tgid;
pst->flags &= ~F_NO_PID_FD;
return 0;
}
/*
***************************************************************************
* Read various stats for given PID.
*
* IN:
* @pid Process whose stats are to be read.
* @pst Pointer on structure where stats will be saved.
* @tgid If !=0, thread whose stats are to be read.
*
* OUT:
* @pst Pointer on structure where stats have been saved.
* @thread_nr Number of threads of the process.
*
* RETURNS:
* 0 if stats have been successfully read, and 1 otherwise.
***************************************************************************
*/
int read_pid_stats(unsigned int pid, struct pid_stats *pst,
unsigned int *thread_nr, unsigned int tgid)
{
if (read_proc_pid_stat(pid, pst, thread_nr, tgid))
return 1;
if (DISPLAY_CMDLINE(pidflag)) {
if (read_proc_pid_cmdline(pid, pst, tgid))
return 1;
}
if (read_proc_pid_status(pid, pst, tgid))
return 1;
if (DISPLAY_STACK(actflag)) {
if (read_proc_pid_smap(pid, pst, tgid))
return 1;
}
if (DISPLAY_KTAB(actflag)) {
if (read_proc_pid_fd(pid, pst, tgid))
return 1;
}
if (DISPLAY_IO(actflag))
/* Assume that /proc/#/task/#/io exists! */
return (read_proc_pid_io(pid, pst, tgid));
return 0;
}
/*
***************************************************************************
* Count number of threads in /proc/#/task directory, including the leader
* one.
*
* IN:
* @pid Process number for which the number of threads are to be counted.
*
* RETURNS:
* Number of threads for the given process (min value is 1).
* A value of 0 indicates that the process has terminated.
***************************************************************************
*/
unsigned int count_tid(unsigned int pid)
{
struct pid_stats pst;
unsigned int thread_nr;
if (read_proc_pid_stat(pid, &pst, &thread_nr, 0) != 0)
/* Task no longer exists */
return 0;
return thread_nr;
}
/*
***************************************************************************
* Count number of processes (and threads).
*
* RETURNS:
* Number of processes (and threads if requested).
***************************************************************************
*/
unsigned int count_pid(void)
{
DIR *dir;
struct dirent *drp;
unsigned int pid = 0;
/* Open /proc directory */
if ((dir = opendir(PROC)) == NULL) {
perror("opendir");
exit(4);
}
/* Get directory entries */
while ((drp = readdir(dir)) != NULL) {
if (isdigit(drp->d_name[0])) {
/* There is at least the TGID */
pid++;
if (DISPLAY_TID(pidflag)) {
pid += count_tid(atoi(drp->d_name));
}
}
}
/* Close /proc directory */
closedir(dir);
return pid;
}
/*
***************************************************************************
* Count number of threads associated with the tasks entered on the command
* line.
*
* RETURNS:
* Number of threads (including the leading one) associated with every task
* entered on the command line.
***************************************************************************
*/
unsigned int count_tid_in_list(void)
{
unsigned int p, tid, pid = 0;
for (p = 0; p < pid_array_nr; p++) {
tid = count_tid(pid_array[p]);
if (!tid) {
/* PID no longer exists */
pid_array[p] = 0;
}
else {
/* <tid_value> TIDs + 1 TGID */
pid += tid + 1;
}
}
return pid;
}
/*
***************************************************************************
* Allocate and init structures according to system state.
***************************************************************************
*/
void pid_sys_init(void)
{
/* Init stat common counters */
init_stats();
/* Count nb of proc */
cpu_nr = get_cpu_nr(~0, FALSE);
if (DISPLAY_ALL_PID(pidflag)) {
/* Count PIDs and allocate structures */
pid_nr = count_pid() + NR_PID_PREALLOC;
salloc_pid(pid_nr);
}
else if (DISPLAY_TID(pidflag)) {
/* Count total number of threads associated with tasks in list */
pid_nr = count_tid_in_list() + NR_PID_PREALLOC;
salloc_pid(pid_nr);
}
else {
pid_nr = pid_array_nr;
salloc_pid(pid_nr);
}
}
/*
***************************************************************************
* Read stats for threads in /proc/#/task directory.
*
* IN:
* @curr Index in array for current sample statistics.
* @pid Process number whose threads stats are to be read.
* @index Index in process list where stats will be saved.
*
* OUT:
* @index Index in process list where next stats will be saved.
***************************************************************************
*/
void read_task_stats(int curr, unsigned int pid, unsigned int *index)
{
DIR *dir;
struct dirent *drp;
char filename[128];
struct pid_stats *pst;
unsigned int thr_nr;
/* Open /proc/#/task directory */
sprintf(filename, PROC_TASK, pid);
if ((dir = opendir(filename)) == NULL)
return;
while (*index < pid_nr) {
while ((drp = readdir(dir)) != NULL) {
if (isdigit(drp->d_name[0]))
break;
}
if (drp) {
pst = st_pid_list[curr] + (*index)++;
if (read_pid_stats(atoi(drp->d_name), pst, &thr_nr, pid)) {
/* Thread no longer exists */
pst->pid = 0;
}
}
else
break;
}
closedir(dir);
}
/*
***************************************************************************
* Read various stats.
*
* IN:
* @curr Index in array for current sample statistics.
***************************************************************************
*/
void read_stats(int curr)
{
DIR *dir;
struct dirent *drp;
unsigned int p = 0, q, pid, thr_nr;
struct pid_stats *pst;
struct stats_cpu *st_cpu;
/*
* Allocate two structures for CPU statistics.
* No need to init them (done by read_stat_cpu() function).
*/
if ((st_cpu = (struct stats_cpu *) malloc(STATS_CPU_SIZE * 2)) == NULL) {
perror("malloc");
exit(4);
}
/* Read statistics for CPUs "all" and 0 */
read_stat_cpu(st_cpu, 2, &uptime[curr], &uptime0[curr]);
free(st_cpu);
if (DISPLAY_ALL_PID(pidflag)) {
/* Open /proc directory */
if ((dir = opendir(PROC)) == NULL) {
perror("opendir");
exit(4);
}
while (p < pid_nr) {
/* Get directory entries */
while ((drp = readdir(dir)) != NULL) {
if (isdigit(drp->d_name[0]))
break;
}
if (drp) {
pst = st_pid_list[curr] + p++;
pid = atoi(drp->d_name);
if (read_pid_stats(pid, pst, &thr_nr, 0)) {
/* Process has terminated */
pst->pid = 0;
}
else if (DISPLAY_TID(pidflag)) {
/* Read stats for threads in task subdirectory */
read_task_stats(curr, pid, &p);
}
}
else {
for (q = p; q < pid_nr; q++) {
pst = st_pid_list[curr] + q;
pst->pid = 0;
}
break;
}
}
/* Close /proc directory */
closedir(dir);
}
else if (DISPLAY_PID(pidflag)) {
unsigned int op;
/* Read stats for each PID in the list */
for (op = 0; op < pid_array_nr; op++) {
if (p >= pid_nr)
break;
pst = st_pid_list[curr] + p++;
if (pid_array[op]) {
/* PID should still exist. So read its stats */
if (read_pid_stats(pid_array[op], pst, &thr_nr, 0)) {
/* PID has terminated */
pst->pid = 0;
pid_array[op] = 0;
}
else if (DISPLAY_TID(pidflag)) {
read_task_stats(curr, pid_array[op], &p);
}
}
}
/* Reset remaining structures */
for (q = p; q < pid_nr; q++) {
pst = st_pid_list[curr] + q;
pst->pid = 0;
}
}
/* else unknown command */
}
/*
***************************************************************************
* Get current PID to display.
* First, check that PID exists. *Then* check that it's an active process
* and/or that the string (entered on the command line with option -C)
* is found in command name, or that the process string (entered on the
* command line with option -G) is found either in its command name (in case
* PID is a process) or in command name of its thread leader (in case
* PID is a thread).
*
* IN:
* @prev Index in array where stats used as reference are.
* @curr Index in array for current sample statistics.
* @p Index in process list.
* @activity Current activity to display (CPU, memory...).