[dev] [PATCH 1/3] slstatus: drop sleep from cpu_perc

From: Kurt Van Dijck <dev.kurt_AT_vandijck-laurijssen.be>
Date: Mon, 11 Sep 2017 20:05:52 +0200

Waiting to retrieve info is not very scalable

Signed-off-by: Kurt Van Dijck <dev.kurt_AT_vandijck-laurijssen.be>

---
 slstatus.c | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)
diff --git a/slstatus.c b/slstatus.c
index 30a9d09..e1f0e00 100644
--- a/slstatus.c
+++ b/slstatus.c
_AT_@ -178,21 +178,18 @@ cpu_freq(void)
 static const char *
 cpu_perc(void)
 {
-	struct timespec delay;
 	int perc;
-	long double a[4], b[4];
+	static long double a[4];
+	static int valid;
+	long double b[4];
 
+	memcpy(b, a, sizeof(b));
 	if (pscanf("/proc/stat", "%*s %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2],
 	           &a[3]) != 4) {
 		return unknown_str;
 	}
-
-	delay.tv_sec = (interval / 2) / 1000;
-	delay.tv_nsec = ((interval / 2) % 1000) * 1000000;
-	nanosleep(&delay, NULL);
-
-	if (pscanf("/proc/stat", "%*s %Lf %Lf %Lf %Lf", &b[0], &b[1], &b[2],
-	           &b[3]) != 4) {
+	if (!valid) {
+		valid = 1;
 		return unknown_str;
 	}
 
-- 
1.8.5.rc3

Received on Mon Sep 11 2017 - 20:05:52 CEST