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https://github.com/sheumann/hush.git
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mpstat: fix total par-cpu IRQ counts
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
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64c67891a2
commit
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@ -163,6 +163,7 @@ static double percent_value(data_t prev, data_t curr, data_t itv)
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static double hz_value(data_t prev, data_t curr, data_t itv)
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{
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//bb_error_msg("curr:%lld prev:%lld G.hz:%u", curr, prev, G.hz);
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return ((double)overflow_safe_sub(prev, curr)) / itv * G.hz;
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}
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@ -413,6 +414,8 @@ static void write_stats_core(int prev, int current,
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continue;
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}
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}
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//bb_error_msg("G.st_irq[%u][%u].irq_nr:%lld - G.st_irq[%u][%u].irq_nr:%lld",
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// current, cpu, G.st_irq[prev][cpu].irq_nr, prev, cpu, G.st_irq[current][cpu].irq_nr);
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printf(" %9.2f\n", hz_value(G.st_irq[prev][cpu].irq_nr, G.st_irq[current][cpu].irq_nr, per_cpu_itv));
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}
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}
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@ -523,16 +526,23 @@ static void get_cpu_statistics(struct stats_cpu *cpu, data_t *up, data_t *up0)
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static void get_irqs_from_stat(struct stats_irq *irq)
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{
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FILE *fp;
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unsigned cpu;
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char buf[1024];
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for (cpu = 1; cpu <= G.cpu_nr; cpu++) {
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irq->irq_nr = 0;
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}
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fp = fopen_for_read(PROCFS_STAT);
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if (!fp)
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return;
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while (fgets(buf, sizeof(buf), fp)) {
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if (strncmp(buf, "intr ", 5) == 0)
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//bb_error_msg("/proc/stat:'%s'", buf);
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if (strncmp(buf, "intr ", 5) == 0) {
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/* Read total number of IRQs since system boot */
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sscanf(buf + 5, "%"FMT_DATA"u", &irq->irq_nr);
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}
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}
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fclose(fp);
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@ -554,12 +564,20 @@ static void get_irqs_from_interrupts(const char *fname,
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unsigned irq;
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int cpu_index[G.cpu_nr];
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int iindex;
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int len, digit;
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for (cpu = 1; cpu <= G.cpu_nr; cpu++) {
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irq_i = &G.st_irq[current][cpu];
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irq_i->irq_nr = 0;
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}
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// Moved to get_irqs_from_stat(), which is called once, not twice,
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// unlike get_irqs_from_interrupts().
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// Otherwise reading of /proc/softirqs
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// was resetting counts to 0 after we painstakingly collected them from
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// /proc/interrupts. Which resulted in:
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// 01:32:47 PM CPU intr/s
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// 01:32:47 PM all 591.47
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// 01:32:47 PM 0 0.00 <= ???
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// 01:32:47 PM 1 0.00 <= ???
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// for (cpu = 1; cpu <= G.cpu_nr; cpu++) {
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// G.st_irq[current][cpu].irq_nr = 0;
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// //bb_error_msg("G.st_irq[%u][%u].irq_nr=0", current, cpu);
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// }
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fp = fopen_for_read(fname);
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if (!fp)
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@ -587,11 +605,15 @@ static void get_irqs_from_interrupts(const char *fname,
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while (fgets(buf, buflen, fp)
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&& irq < irqs_per_cpu
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) {
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int len;
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char last_char;
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char *cp;
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/* Skip over "<irq>:" */
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/* Skip over "IRQNAME:" */
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cp = strchr(buf, ':');
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if (!cp)
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continue;
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last_char = cp[-1];
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ic = &per_cpu_stats[current][irq];
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len = cp - buf;
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@ -600,7 +622,6 @@ static void get_irqs_from_interrupts(const char *fname,
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}
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safe_strncpy(ic->irq_name, buf, len + 1);
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//bb_error_msg("%s: irq%d:'%s' buf:'%s'", fname, irq, ic->irq_name, buf);
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digit = isdigit(buf[len - 1]);
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cp++;
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for (cpu = 0; cpu < iindex; cpu++) {
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@ -608,9 +629,11 @@ static void get_irqs_from_interrupts(const char *fname,
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ic = &per_cpu_stats[current][cpu_index[cpu] * irqs_per_cpu + irq];
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irq_i = &G.st_irq[current][cpu_index[cpu] + 1];
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ic->interrupt = strtoul(cp, &next, 10);
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if (digit) {
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/* Do not count non-numerical IRQs */
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/* Count only numerical IRQs */
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if (isdigit(last_char)) {
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irq_i->irq_nr += ic->interrupt;
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//bb_error_msg("G.st_irq[%u][%u].irq_nr + %u = %lld",
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// current, cpu_index[cpu] + 1, ic->interrupt, irq_i->irq_nr);
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}
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cp = next;
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}
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