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rd_stats.c
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rd_stats.c
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/*
* rd_stats.c: Read system statistics
* (C) 1999-2022 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., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA *
***************************************************************************
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <dirent.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/statvfs.h>
#include <unistd.h>
#include "common.h"
#include "rd_stats.h"
#ifdef USE_NLS
#include <locale.h>
#include <libintl.h>
#define _(string) gettext(string)
#else
#define _(string) (string)
#endif
/* Generic PSI structure */
struct stats_psi {
unsigned long long total;
unsigned long avg10;
unsigned long avg60;
unsigned long avg300;
};
/*
***************************************************************************
* Read CPU statistics.
* Remember that this function is used by several sysstat commands!
*
* IN:
* @st_cpu Buffer where structures containing stats will be saved.
* @nr_alloc Total number of structures allocated. Value is >= 1.
*
* OUT:
* @st_cpu Buffer with statistics.
*
* RETURNS:
* Highest CPU number(*) for which statistics have been read.
* 1 means CPU "all", 2 means CPU 0, 3 means CPU 1, etc.
* Or -1 if the buffer was too small and needs to be reallocated.
*
* (*)This doesn't account for all processors in the machine in the case
* where some CPU are offline and located at the end of the list.
*
* USED BY:
* sadc, iostat, mpstat, pidstat
***************************************************************************
*/
__nr_t read_stat_cpu(struct stats_cpu *st_cpu, __nr_t nr_alloc)
{
FILE *fp;
struct stats_cpu *st_cpu_i;
struct stats_cpu sc;
char line[8192];
int proc_nr;
__nr_t cpu_read = 0;
if ((fp = fopen(STAT, "r")) == NULL) {
fprintf(stderr, _("Cannot open %s: %s\n"), STAT, strerror(errno));
exit(2);
}
while (fgets(line, sizeof(line), fp) != NULL) {
if (!strncmp(line, "cpu ", 4)) {
/*
* All the fields don't necessarily exist,
* depending on the kernel version used.
*/
memset(st_cpu, 0, STATS_CPU_SIZE);
/*
* Read the number of jiffies spent in the different modes
* (user, nice, etc.) among all proc. CPU usage is not reduced
* to one processor to avoid rounding problems.
*/
sscanf(line + 5, "%llu %llu %llu %llu %llu %llu %llu %llu %llu %llu",
&st_cpu->cpu_user,
&st_cpu->cpu_nice,
&st_cpu->cpu_sys,
&st_cpu->cpu_idle,
&st_cpu->cpu_iowait,
&st_cpu->cpu_hardirq,
&st_cpu->cpu_softirq,
&st_cpu->cpu_steal,
&st_cpu->cpu_guest,
&st_cpu->cpu_guest_nice);
if (!cpu_read) {
cpu_read = 1;
}
if (nr_alloc == 1)
/* We just want to read stats for CPU "all" */
break;
}
else if (!strncmp(line, "cpu", 3)) {
/* All the fields don't necessarily exist */
memset(&sc, 0, STATS_CPU_SIZE);
/*
* Read the number of jiffies spent in the different modes
* (user, nice, etc) for current proc.
* This is done only on SMP machines.
*/
sscanf(line + 3, "%d %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu",
&proc_nr,
&sc.cpu_user,
&sc.cpu_nice,
&sc.cpu_sys,
&sc.cpu_idle,
&sc.cpu_iowait,
&sc.cpu_hardirq,
&sc.cpu_softirq,
&sc.cpu_steal,
&sc.cpu_guest,
&sc.cpu_guest_nice);
if (proc_nr + 2 > nr_alloc) {
cpu_read = -1;
break;
}
st_cpu_i = st_cpu + proc_nr + 1;
*st_cpu_i = sc;
if (proc_nr + 2 > cpu_read) {
cpu_read = proc_nr + 2;
}
}
}
fclose(fp);
return cpu_read;
}
/*
***************************************************************************
* Read interrupts statistics from /proc/interrupts.
*
* IN:
* @st_irq Structure where stats will be saved.
* @nr_alloc Number of CPU structures allocated. Value is >= 1.
* @nr_int Number of interrupts, including sum. value is >= 1.
*
* OUT:
* @st_irq Structure with statistics.
*
* RETURNS:
* Highest CPU number for which stats have been successfully read (2 for CPU0,
* 3 for CPU 1, etc.) Same logic than for softnet statistics. This number will
* be saved in a->_nr0. See wrap_read_stat_irq().
* Returns 0 if no statistics have been read.
* Returns -1 if the buffer was too small and needs to be reallocated (we
* mean here, too small for all the CPU, not for the interrupts whose number
* is considered to be a constant. Remember that only the number of items is
* saved in file preceding each sample, not the number of sub-items).
***************************************************************************
*/
__nr_t read_stat_irq(struct stats_irq *st_irq, __nr_t nr_alloc, __nr_t nr_int)
{
FILE *fp;
struct stats_irq *st_cpuall_sum, *st_cpu_irq, *st_cpu_sum, *st_cpuall_irq;
char *line = NULL, *li;
int rc = 0, irq_read = 0;
int cpu, len;
int cpu_nr = nr_alloc - 1;
int *cpu_index = NULL, index = 0;
char *cp, *next;
if (!cpu_nr) {
/* We have only one proc and a non SMP kernel */
cpu_nr = 1;
}
SREALLOC(cpu_index, int, sizeof(int) * cpu_nr);
if ((fp = fopen(INTERRUPTS, "r")) != NULL) {
SREALLOC(line, char, INTERRUPTS_LINE + 11 * cpu_nr);
/*
* Parse header line to see which CPUs are online
*/
while (fgets(line, INTERRUPTS_LINE + 11 * cpu_nr, fp) != NULL) {
next = line;
while (((cp = strstr(next, "CPU")) != NULL) && (index < cpu_nr)) {
cpu = strtol(cp + 3, &next, 10);
if (cpu + 2 > nr_alloc) {
rc = -1;
goto out;
}
cpu_index[index++] = cpu;
}
if (index)
/* Header line found */
break;
}
st_cpuall_sum = st_irq;
/* Save name "sum" for total number of interrupts */
strcpy(st_cpuall_sum->irq_name, K_LOWERSUM);
/* Parse each line of interrupts statistics data */
while ((fgets(line, INTERRUPTS_LINE + 11 * cpu_nr, fp) != NULL) &&
(irq_read < nr_int - 1)) {
/* Skip over "<irq>:" */
if ((cp = strchr(line, ':')) == NULL)
/* Chr ':' not found */
continue;
cp++;
irq_read++;
st_cpuall_irq = st_irq + irq_read;
/* Remove possible heading spaces in interrupt's name... */
li = line;
while (*li == ' ')
li++;
len = strcspn(li, ":");
if (len >= MAX_SA_IRQ_LEN) {
len = MAX_SA_IRQ_LEN - 1;
}
/* ...then save its name */
strncpy(st_cpuall_irq->irq_name, li, len);
st_cpuall_irq->irq_name[len] = '\0';
/* For each interrupt: Get number received by each CPU */
for (cpu = 0; cpu < index; cpu++) {
st_cpu_sum = st_irq + (cpu_index[cpu] + 1) * nr_int;
st_cpu_irq = st_irq + (cpu_index[cpu] + 1) * nr_int + irq_read;
/*
* Interrupt name is saved only for CPU "all".
* Now save current interrupt value for current CPU
* and total number of interrupts received by current CPU
* and number of current interrupt received by all CPU.
*/
st_cpu_irq->irq_nr = strtoul(cp, &next, 10);
st_cpuall_irq->irq_nr += st_cpu_irq->irq_nr;
st_cpu_sum->irq_nr += st_cpu_irq->irq_nr;
cp = next;
}
st_cpuall_sum->irq_nr += st_cpuall_irq->irq_nr;
}
out:
free(line);
fclose(fp);
}
if (index && !rc) {
rc = cpu_index[index - 1] + 2;
}
free(cpu_index);
return rc;
}
/*
***************************************************************************
* Read memory statistics from /proc/meminfo.
*
* IN:
* @st_memory Structure where stats will be saved.
*
* OUT:
* @st_memory Structure with statistics.
*
* RETURNS:
* 1 on success, 0 otherwise.
*
* USED BY:
* sadc, pidstat
***************************************************************************
*/
__nr_t read_meminfo(struct stats_memory *st_memory)
{
FILE *fp;
char line[128];
if ((fp = fopen(MEMINFO, "r")) == NULL)
return 0;
while (fgets(line, sizeof(line), fp) != NULL) {
if (!strncmp(line, "MemTotal:", 9)) {
/* Read the total amount of memory in kB */
sscanf(line + 9, "%llu", &st_memory->tlmkb);
}
else if (!strncmp(line, "MemFree:", 8)) {
/* Read the amount of free memory in kB */
sscanf(line + 8, "%llu", &st_memory->frmkb);
}
else if (!strncmp(line, "MemAvailable:", 13)) {
/* Read the amount of available memory in kB */
sscanf(line + 13, "%llu", &st_memory->availablekb);
}
else if (!strncmp(line, "Buffers:", 8)) {
/* Read the amount of buffered memory in kB */
sscanf(line + 8, "%llu", &st_memory->bufkb);
}
else if (!strncmp(line, "Cached:", 7)) {
/* Read the amount of cached memory in kB */
sscanf(line + 7, "%llu", &st_memory->camkb);
}
else if (!strncmp(line, "SwapCached:", 11)) {
/* Read the amount of cached swap in kB */
sscanf(line + 11, "%llu", &st_memory->caskb);
}
else if (!strncmp(line, "Active:", 7)) {
/* Read the amount of active memory in kB */
sscanf(line + 7, "%llu", &st_memory->activekb);
}
else if (!strncmp(line, "Inactive:", 9)) {
/* Read the amount of inactive memory in kB */
sscanf(line + 9, "%llu", &st_memory->inactkb);
}
else if (!strncmp(line, "SwapTotal:", 10)) {
/* Read the total amount of swap memory in kB */
sscanf(line + 10, "%llu", &st_memory->tlskb);
}
else if (!strncmp(line, "SwapFree:", 9)) {
/* Read the amount of free swap memory in kB */
sscanf(line + 9, "%llu", &st_memory->frskb);
}
else if (!strncmp(line, "Dirty:", 6)) {
/* Read the amount of dirty memory in kB */
sscanf(line + 6, "%llu", &st_memory->dirtykb);
}
else if (!strncmp(line, "Committed_AS:", 13)) {
/* Read the amount of commited memory in kB */
sscanf(line + 13, "%llu", &st_memory->comkb);
}
else if (!strncmp(line, "AnonPages:", 10)) {
/* Read the amount of pages mapped into userspace page tables in kB */
sscanf(line + 10, "%llu", &st_memory->anonpgkb);
}
else if (!strncmp(line, "Slab:", 5)) {
/* Read the amount of in-kernel data structures cache in kB */
sscanf(line + 5, "%llu", &st_memory->slabkb);
}
else if (!strncmp(line, "KernelStack:", 12)) {
/* Read the kernel stack utilization in kB */
sscanf(line + 12, "%llu", &st_memory->kstackkb);
}
else if (!strncmp(line, "PageTables:", 11)) {
/* Read the amount of memory dedicated to the lowest level of page tables in kB */
sscanf(line + 11, "%llu", &st_memory->pgtblkb);
}
else if (!strncmp(line, "VmallocUsed:", 12)) {
/* Read the amount of vmalloc area which is used in kB */
sscanf(line + 12, "%llu", &st_memory->vmusedkb);
}
}
fclose(fp);
return 1;
}
/*
***************************************************************************
* Read machine uptime, independently of the number of processors.
*
* OUT:
* @uptime Uptime value in hundredths of a second.
*
* USED BY:
* sadc, cifsiostat, iostat, mpstat, pidstat
***************************************************************************
*/
void read_uptime(unsigned long long *uptime)
{
FILE *fp = NULL;
char line[128];
unsigned long up_sec, up_cent;
int err = FALSE;
if ((fp = fopen(UPTIME, "r")) == NULL) {
err = TRUE;
}
else if (fgets(line, sizeof(line), fp) == NULL) {
err = TRUE;
}
else if (sscanf(line, "%lu.%lu", &up_sec, &up_cent) == 2) {
*uptime = (unsigned long long) up_sec * 100 +
(unsigned long long) up_cent;
}
else {
err = TRUE;
}
if (fp != NULL) {
fclose(fp);
}
if (err) {
fprintf(stderr, _("Cannot read %s\n"), UPTIME);
exit(2);
}
}
/*
***************************************************************************
* Compute "extended" device statistics (service time, etc.).
*
* IN:
* @sdc Structure with current device statistics.
* @sdp Structure with previous device statistics.
* @itv Interval of time in 1/100th of a second.
*
* OUT:
* @xds Structure with extended statistics.
*
* USED BY:
* sar, sadf, iostat
***************************************************************************
*/
void compute_ext_disk_stats(struct stats_disk *sdc, struct stats_disk *sdp,
unsigned long long itv, struct ext_disk_stats *xds)
{
xds->util = S_VALUE(sdp->tot_ticks, sdc->tot_ticks, itv);
/*
* Kernel gives ticks already in milliseconds for all platforms
* => no need for further scaling.
* Origin (unmerged) flush operations are counted as writes.
*/
xds->await = (sdc->nr_ios - sdp->nr_ios) ?
((sdc->rd_ticks - sdp->rd_ticks) + (sdc->wr_ticks - sdp->wr_ticks) + (sdc->dc_ticks - sdp->dc_ticks)) /
((double) (sdc->nr_ios - sdp->nr_ios)) : 0.0;
xds->arqsz = (sdc->nr_ios - sdp->nr_ios) ?
((sdc->rd_sect - sdp->rd_sect) + (sdc->wr_sect - sdp->wr_sect) + (sdc->dc_sect - sdp->dc_sect)) /
((double) (sdc->nr_ios - sdp->nr_ios)) : 0.0;
}
/*
***************************************************************************
* Since ticks may vary slightly from CPU to CPU, we'll want
* to recalculate itv based on this CPU's tick count, rather
* than that reported by the "cpu" line. Otherwise we
* occasionally end up with slightly skewed figures, with
* the skew being greater as the time interval grows shorter.
*
* IN:
* @scc Current sample statistics for current CPU.
* @scp Previous sample statistics for current CPU.
*
* RETURNS:
* Interval of time based on current CPU, expressed in jiffies.
*
* USED BY:
* sar, sadf, mpstat
***************************************************************************
*/
unsigned long long get_per_cpu_interval(struct stats_cpu *scc,
struct stats_cpu *scp)
{
unsigned long long ishift = 0LL;
if ((scc->cpu_user - scc->cpu_guest) < (scp->cpu_user - scp->cpu_guest)) {
/*
* Sometimes the nr of jiffies spent in guest mode given by the guest
* counter in /proc/stat is slightly higher than that included in
* the user counter. Update the interval value accordingly.
*/
ishift += (scp->cpu_user - scp->cpu_guest) -
(scc->cpu_user - scc->cpu_guest);
}
if ((scc->cpu_nice - scc->cpu_guest_nice) < (scp->cpu_nice - scp->cpu_guest_nice)) {
/*
* Idem for nr of jiffies spent in guest_nice mode.
*/
ishift += (scp->cpu_nice - scp->cpu_guest_nice) -
(scc->cpu_nice - scc->cpu_guest_nice);
}
/*
* Workaround for CPU coming back online: With recent kernels
* some fields (user, nice, system) restart from their previous value,
* whereas others (idle, iowait) restart from zero.
* For the latter we need to set their previous value to zero to
* avoid getting an interval value < 0.
* (I don't know how the other fields like hardirq, steal... behave).
* Don't assume the CPU has come back from offline state if previous
* value was greater than ULLONG_MAX - 0x7ffff (the counter probably
* overflew).
*/
if ((scc->cpu_iowait < scp->cpu_iowait) && (scp->cpu_iowait < (ULLONG_MAX - 0x7ffff))) {
/*
* The iowait value reported by the kernel can also decrement as
* a result of inaccurate iowait tracking. Waiting on IO can be
* first accounted as iowait but then instead as idle.
* Therefore if the idle value during the same period did not
* decrease then consider this is a problem with the iowait
* reporting and correct the previous value according to the new
* reading. Otherwise, treat this as CPU coming back online.
*/
if ((scc->cpu_idle > scp->cpu_idle) || (scp->cpu_idle >= (ULLONG_MAX - 0x7ffff))) {
scp->cpu_iowait = scc->cpu_iowait;
}
else {
scp->cpu_iowait = 0;
}
}
if ((scc->cpu_idle < scp->cpu_idle) && (scp->cpu_idle < (ULLONG_MAX - 0x7ffff))) {
scp->cpu_idle = 0;
}
/*
* Don't take cpu_guest and cpu_guest_nice into account
* because cpu_user and cpu_nice already include them.
*/
return ((scc->cpu_user + scc->cpu_nice +
scc->cpu_sys + scc->cpu_iowait +
scc->cpu_idle + scc->cpu_steal +
scc->cpu_hardirq + scc->cpu_softirq) -
(scp->cpu_user + scp->cpu_nice +
scp->cpu_sys + scp->cpu_iowait +
scp->cpu_idle + scp->cpu_steal +
scp->cpu_hardirq + scp->cpu_softirq) +
ishift);
}
#ifdef SOURCE_SADC
/*---------------- BEGIN: FUNCTIONS USED BY SADC ONLY ---------------------*/
/*
***************************************************************************
* Replace octal codes in string with their corresponding characters.
*
* IN:
* @str String to parse.
*
* OUT:
* @str String with octal codes replaced with characters.
***************************************************************************
*/
void oct2chr(char *str)
{
int i = 0;
int j, len;
len = strlen(str);
while (i < len - 3) {
if ((str[i] == '\\') &&
(str[i + 1] >= '0') && (str[i + 1] <= '3') &&
(str[i + 2] >= '0') && (str[i + 2] <= '7') &&
(str[i + 3] >= '0') && (str[i + 3] <= '7')) {
/* Octal code found */
str[i] = (str[i + 1] - 48) * 64 +
(str[i + 2] - 48) * 8 +
(str[i + 3] - 48);
for (j = i + 4; j <= len; j++) {
str[j - 3] = str[j];
}
len -= 3;
}
i++;
}
}
/*
***************************************************************************
* Read processes (tasks) creation and context switches statistics
* from /proc/stat.
*
* IN:
* @st_pcsw Structure where stats will be saved.
*
* OUT:
* @st_pcsw Structure with statistics.
*
* RETURNS:
* 1 on success, 0 otherwise.
***************************************************************************
*/
__nr_t read_stat_pcsw(struct stats_pcsw *st_pcsw)
{
FILE *fp;
char line[8192];
if ((fp = fopen(STAT, "r")) == NULL)
return 0;
while (fgets(line, sizeof(line), fp) != NULL) {
if (!strncmp(line, "ctxt ", 5)) {
/* Read number of context switches */
sscanf(line + 5, "%llu", &st_pcsw->context_switch);
}
else if (!strncmp(line, "processes ", 10)) {
/* Read number of processes created since system boot */
sscanf(line + 10, "%lu", &st_pcsw->processes);
}
}
fclose(fp);
return 1;
}
/*
***************************************************************************
* Read queue and load statistics from /proc/loadavg and /proc/stat.
*
* IN:
* @st_queue Structure where stats will be saved.
*
* OUT:
* @st_queue Structure with statistics.
*
* RETURNS:
* 1 on success, 0 otherwise.
***************************************************************************
*/
__nr_t read_loadavg(struct stats_queue *st_queue)
{
FILE *fp;
char line[8192];
unsigned int load_tmp[3];
int rc;
if ((fp = fopen(LOADAVG, "r")) == NULL)
return 0;
/* Read load averages and queue length */
rc = fscanf(fp, "%u.%u %u.%u %u.%u %llu/%llu %*d\n",
&load_tmp[0], &st_queue->load_avg_1,
&load_tmp[1], &st_queue->load_avg_5,
&load_tmp[2], &st_queue->load_avg_15,
&st_queue->nr_running,
&st_queue->nr_threads);
fclose(fp);
if (rc < 8)
return 0;
st_queue->load_avg_1 += load_tmp[0] * 100;
st_queue->load_avg_5 += load_tmp[1] * 100;
st_queue->load_avg_15 += load_tmp[2] * 100;
if (st_queue->nr_running) {
/* Do not take current process into account */
st_queue->nr_running--;
}
/* Read nr of tasks blocked from /proc/stat */
if ((fp = fopen(STAT, "r")) == NULL)
return 0;
while (fgets(line, sizeof(line), fp) != NULL) {
if (!strncmp(line, "procs_blocked ", 14)) {
/* Read number of processes blocked */
sscanf(line + 14, "%llu", &st_queue->procs_blocked);
break;
}
}
fclose(fp);
return 1;
}
/*
***************************************************************************
* Read swapping statistics from /proc/vmstat.
*
* IN:
* @st_swap Structure where stats will be saved.
*
* OUT:
* @st_swap Structure with statistics.
*
* RETURNS:
* 1 on success, 0 otherwise.
***************************************************************************
*/
__nr_t read_vmstat_swap(struct stats_swap *st_swap)
{
FILE *fp;
char line[128];
if ((fp = fopen(VMSTAT, "r")) == NULL)
return 0;
while (fgets(line, sizeof(line), fp) != NULL) {
if (!strncmp(line, "pswpin ", 7)) {
/* Read number of swap pages brought in */
sscanf(line + 7, "%lu", &st_swap->pswpin);
}
else if (!strncmp(line, "pswpout ", 8)) {
/* Read number of swap pages brought out */
sscanf(line + 8, "%lu", &st_swap->pswpout);
}
}
fclose(fp);
return 1;
}
/*
***************************************************************************
* Read paging statistics from /proc/vmstat.
*
* IN:
* @st_paging Structure where stats will be saved.
*
* OUT:
* @st_paging Structure with statistics.
*
* RETURNS:
* 1 on success, 0 otherwise.
***************************************************************************
*/
__nr_t read_vmstat_paging(struct stats_paging *st_paging)
{
FILE *fp;
char line[128];
unsigned long pgtmp;
if ((fp = fopen(VMSTAT, "r")) == NULL)
return 0;
st_paging->pgsteal = 0;
st_paging->pgscan_kswapd = st_paging->pgscan_direct = 0;
while (fgets(line, sizeof(line), fp) != NULL) {
if (!strncmp(line, "pgpgin ", 7)) {
/* Read number of pages the system paged in */
sscanf(line + 7, "%lu", &st_paging->pgpgin);
}
else if (!strncmp(line, "pgpgout ", 8)) {
/* Read number of pages the system paged out */
sscanf(line + 8, "%lu", &st_paging->pgpgout);
}
else if (!strncmp(line, "pgfault ", 8)) {
/* Read number of faults (major+minor) made by the system */
sscanf(line + 8, "%lu", &st_paging->pgfault);
}
else if (!strncmp(line, "pgmajfault ", 11)) {
/* Read number of faults (major only) made by the system */
sscanf(line + 11, "%lu", &st_paging->pgmajfault);
}
else if (!strncmp(line, "pgfree ", 7)) {
/* Read number of pages freed by the system */
sscanf(line + 7, "%lu", &st_paging->pgfree);
}
else if (!strncmp(line, "pgsteal_", 8)) {
/* Read number of pages stolen by the system */
sscanf(strchr(line, ' '), "%lu", &pgtmp);
st_paging->pgsteal += pgtmp;
}
else if (!strncmp(line, "pgscan_kswapd", 13)) {
/* Read number of pages scanned by the kswapd daemon */
sscanf(strchr(line, ' '), "%lu", &pgtmp);
st_paging->pgscan_kswapd += pgtmp;
}
else if (!strncmp(line, "pgscan_direct", 13)) {
/* Read number of pages scanned directly */
sscanf(strchr(line, ' '), "%lu", &pgtmp);
st_paging->pgscan_direct += pgtmp;
}
}
fclose(fp);
return 1;
}
/*
***************************************************************************
* Read I/O and transfer rates statistics from /proc/diskstats.
*
* IN:
* @st_io Structure where stats will be saved.
*
* OUT:
* @st_io Structure with statistics.
*
* RETURNS:
* 1 on success, 0 otherwise.
***************************************************************************
*/
__nr_t read_diskstats_io(struct stats_io *st_io)
{
FILE *fp;
char line[1024];
char dev_name[MAX_NAME_LEN];
unsigned int major, minor;
unsigned long rd_ios, wr_ios, dc_ios;
unsigned long rd_sec, wr_sec, dc_sec;
if ((fp = fopen(DISKSTATS, "r")) == NULL)
return 0;
while (fgets(line, sizeof(line), fp) != NULL) {
/* Discard I/O stats may be not available */
dc_ios = dc_sec = 0;
if (sscanf(line,
"%u %u %s "
"%lu %*u %lu %*u "
"%lu %*u %lu %*u "
"%*u %*u %*u "
"%lu %*u %lu",
&major, &minor, dev_name,
&rd_ios, &rd_sec,
&wr_ios, &wr_sec,
&dc_ios, &dc_sec) >= 7) {
if (is_device(SLASH_SYS, dev_name, IGNORE_VIRTUAL_DEVICES)) {
/*
* OK: It's a (real) device and not a partition.
* Note: Structure should have been initialized first!
*/
st_io->dk_drive += (unsigned long long) rd_ios +
(unsigned long long) wr_ios +
(unsigned long long) dc_ios;
st_io->dk_drive_rio += rd_ios;
st_io->dk_drive_rblk += rd_sec;
st_io->dk_drive_wio += wr_ios;
st_io->dk_drive_wblk += wr_sec;
st_io->dk_drive_dio += dc_ios;
st_io->dk_drive_dblk += dc_sec;
}
}
}
fclose(fp);
return 1;
}
/*
***************************************************************************
* Read block devices statistics from /proc/diskstats.
*
* IN:
* @st_disk Structure where stats will be saved.
* @nr_alloc Total number of structures allocated. Value is >= 1.
* @read_part True if disks *and* partitions should be read; False if only
* disks are read.
*
* OUT:
* @st_disk Structure with statistics.
*
* RETURNS:
* Number of block devices read, or -1 if the buffer was too small and
* needs to be reallocated.
***************************************************************************
*/
__nr_t read_diskstats_disk(struct stats_disk *st_disk, __nr_t nr_alloc,
int read_part)
{
FILE *fp;
char line[1024];
char dev_name[MAX_NAME_LEN];
struct stats_disk *st_disk_i;
unsigned int major, minor, rd_ticks, wr_ticks, dc_ticks, tot_ticks, rq_ticks, part_nr;
unsigned long rd_ios, wr_ios, dc_ios, rd_sec, wr_sec, dc_sec;
unsigned long long wwn[2];
__nr_t dsk_read = 0;
if ((fp = fopen(DISKSTATS, "r")) == NULL)
return 0;
while (fgets(line, sizeof(line), fp) != NULL) {
/* Discard I/O stats may be not available */
dc_ios = dc_sec = dc_ticks = 0;
if (sscanf(line,
"%u %u %s "
"%lu %*u %lu %u "
"%lu %*u %lu %u "
"%*u %u %u "
"%lu %*u %lu %u",
&major, &minor, dev_name,
&rd_ios, &rd_sec, &rd_ticks,
&wr_ios, &wr_sec, &wr_ticks,
&tot_ticks, &rq_ticks,
&dc_ios, &dc_sec, &dc_ticks) >= 11) {
if (!rd_ios && !wr_ios && !dc_ios)
/* Unused device: Ignore it */
continue;
if (read_part || is_device(SLASH_SYS, dev_name, ACCEPT_VIRTUAL_DEVICES)) {
if (dsk_read + 1 > nr_alloc) {
dsk_read = -1;
break;
}
st_disk_i = st_disk + dsk_read++;
st_disk_i->major = major;
st_disk_i->minor = minor;
st_disk_i->nr_ios = (unsigned long long) rd_ios +
(unsigned long long) wr_ios +
(unsigned long long) dc_ios;
st_disk_i->rd_sect = rd_sec;
st_disk_i->wr_sect = wr_sec;
st_disk_i->dc_sect = dc_sec;
st_disk_i->rd_ticks = rd_ticks;
st_disk_i->wr_ticks = wr_ticks;
st_disk_i->dc_ticks = dc_ticks;
st_disk_i->tot_ticks = tot_ticks;
st_disk_i->rq_ticks = rq_ticks;
if (get_wwnid_from_pretty(dev_name, wwn, &part_nr) < 0) {
st_disk_i->wwn[0] = 0ULL;
}
else {
st_disk_i->wwn[0] = wwn[0];
st_disk_i->wwn[1] = wwn[1];
st_disk_i->part_nr = part_nr;
}
}
}
}
fclose(fp);
return dsk_read;
}
/*
***************************************************************************
* Read serial lines statistics from /proc/tty/driver/serial.
*
* IN:
* @st_serial Structure where stats will be saved.
* @nr_alloc Total number of structures allocated. Value is >= 1.
*
* OUT:
* @st_serial Structure with statistics.
*
* RETURNS:
* Number of serial lines read, or -1 if the buffer was too small and
* needs to be reallocated.
***************************************************************************
*/
__nr_t read_tty_driver_serial(struct stats_serial *st_serial, __nr_t nr_alloc)
{
FILE *fp;
struct stats_serial *st_serial_i;
char line[256];
char *p;
__nr_t sl_read = 0;
if ((fp = fopen(SERIAL, "r")) == NULL)
return 0;
while (fgets(line, sizeof(line), fp) != NULL ) {
if ((p = strstr(line, "tx:")) != NULL) {
if (sl_read + 1 > nr_alloc) {
sl_read = -1;
break;
}
st_serial_i = st_serial + sl_read++;
/* Read serial line number */
sscanf(line, "%u", &st_serial_i->line);
/*
* Read the number of chars transmitted and received by
* current serial line.
*/