From: Sebastien GODARD <sysstat@users.noreply.github.com>
Date: Sun, 6 Feb 2022 16:47:58 +0000 (+0100)
Subject: A_IRQ: sar: Display 0.00 when number of interrupts decreases
X-Git-Tag: v12.5.6~28
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=5c1505821918565c9d13958fce387df1d135e74b;p=sysstat

A_IRQ: sar: Display 0.00 when number of interrupts decreases

When a CPU goes offline, the number of interrupts among all CPU can
decrease. In this case, display a value of 0.00 instead of the huge
number that would appear otherwise.

Signed-off-by: Sebastien GODARD <sysstat@users.noreply.github.com>
---

diff --git a/pr_stats.c b/pr_stats.c
index 6d62fd7..fb4426c 100644
--- a/pr_stats.c
+++ b/pr_stats.c
@@ -397,8 +397,18 @@ __print_funct_t print_irq_stats(struct activity *a, int prev, int curr,
 				/* No */
 				continue;
 
-			/* Yes: Display it */
-			cprintf_f(NO_UNIT, 1, 9, 2, S_VALUE(stp_cpu_irq->irq_nr, stc_cpu_irq->irq_nr, itv));
+			if (!c && (stc_cpu_irq->irq_nr < stp_cpu_irq->irq_nr)) {
+				/*
+				 * Total number among all CPU for a given interrupt may decrease if
+				 * a CPU has gone offline. In this case we display "0.00" instead of
+				 * the huge number that would appear otherwise.
+				 */
+				cprintf_f(NO_UNIT, 1, 9, 2, 0.0);
+			}
+			else {
+				cprintf_f(NO_UNIT, 1, 9, 2,
+					  S_VALUE(stp_cpu_irq->irq_nr, stc_cpu_irq->irq_nr, itv));
+			}
 
 			if (DISPLAY_PRETTY(flags)) {
 				cprintf_in(IS_STR, " %9s", stc_cpuall_irq->irq_name, 0);