X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=src%2Fswap.c;h=a8276c7dd4267a0887a07a7547451a0a6eb76bf6;hb=b57d6e25aa792f0461aee4e5bd6d1838c478af50;hp=508f9d54cccbc04bb6fe05ce696bda18ad1a9350;hpb=72ec1d0ed6cde4aa78f17d031e7a48e37cbf7a57;p=collectd.git

diff --git a/src/swap.c b/src/swap.c
index 508f9d54..a8276c7d 100644
--- a/src/swap.c
+++ b/src/swap.c
@@ -157,6 +157,8 @@ static int swap_init (void) /* {{{ */
 /* #endif defined(VM_SWAPUSAGE) */
 
 #elif HAVE_LIBKVM_GETSWAPINFO
+	char errbuf[_POSIX2_LINE_MAX];
+
 	if (kvm_obj != NULL)
 	{
 		kvm_close (kvm_obj);
@@ -165,14 +167,11 @@ static int swap_init (void) /* {{{ */
 
 	kvm_pagesize = getpagesize ();
 
-	if ((kvm_obj = kvm_open (NULL, /* execfile */
-					NULL, /* corefile */
-					NULL, /* swapfile */
-					O_RDONLY, /* flags */
-					NULL)) /* errstr */
-			== NULL)
+	kvm_obj = kvm_openfiles (NULL, "/dev/null", NULL, O_RDONLY, errbuf);
+
+	if (kvm_obj == NULL)
 	{
-		ERROR ("swap plugin: kvm_open failed.");
+		ERROR ("swap plugin: kvm_openfiles failed, %s", errbuf);
 		return (-1);
 	}
 /* #endif HAVE_LIBKVM_GETSWAPINFO */
@@ -205,11 +204,11 @@ static void swap_submit_usage (char const *plugin_instance, /* {{{ */
 	sstrncpy (vl.type, "swap", sizeof (vl.type));
 
 	if (values_absolute)
-		plugin_dispatch_multivalue (&vl, 0,
+		plugin_dispatch_multivalue (&vl, 0, DS_TYPE_GAUGE,
 				"used", used, "free", free,
 				other_name, other_value, NULL);
 	if (values_percentage)
-		plugin_dispatch_multivalue (&vl, 1,
+		plugin_dispatch_multivalue (&vl, 1, DS_TYPE_GAUGE,
 				"used", used, "free", free,
 				other_name, other_value, NULL);
 } /* }}} void swap_submit_usage */
@@ -295,11 +294,10 @@ static int swap_read_combined (void) /* {{{ */
 	FILE *fh;
 	char buffer[1024];
 
-	uint8_t have_data = 0;
-	gauge_t swap_used   = 0.0;
-	gauge_t swap_cached = 0.0;
-	gauge_t swap_free   = 0.0;
-	gauge_t swap_total  = 0.0;
+	gauge_t swap_used   = NAN;
+	gauge_t swap_cached = NAN;
+	gauge_t swap_free   = NAN;
+	gauge_t swap_total  = NAN;
 
 	fh = fopen ("/proc/meminfo", "r");
 	if (fh == NULL)
@@ -320,35 +318,30 @@ static int swap_read_combined (void) /* {{{ */
 			continue;
 
 		if (strcasecmp (fields[0], "SwapTotal:") == 0)
-		{
-			swap_total = strtod (fields[1], /* endptr = */ NULL);
-			have_data |= 0x01;
-		}
+			strtogauge (fields[1], &swap_total);
 		else if (strcasecmp (fields[0], "SwapFree:") == 0)
-		{
-			swap_free = strtod (fields[1], /* endptr = */ NULL);
-			have_data |= 0x02;
-		}
+			strtogauge (fields[1], &swap_free);
 		else if (strcasecmp (fields[0], "SwapCached:") == 0)
-		{
-			swap_cached = strtod (fields[1], /* endptr = */ NULL);
-			have_data |= 0x04;
-		}
+			strtogauge (fields[1], &swap_cached);
 	}
 
 	fclose (fh);
 
-	if (have_data != 0x07)
+	if (isnan (swap_total) || isnan (swap_free))
 		return (ENOENT);
 
-	if (isnan (swap_total)
-			|| (swap_total <= 0.0)
-			|| ((swap_free + swap_cached) > swap_total))
-		return (EINVAL);
+	/* Some systems, OpenVZ for example, don't provide SwapCached. */
+	if (isnan (swap_cached))
+		swap_used = swap_total - swap_free;
+	else
+		swap_used = swap_total - (swap_free + swap_cached);
+	assert (!isnan (swap_used));
 
-	swap_used = swap_total - (swap_free + swap_cached);
+	if (swap_used < 0.0)
+		return (EINVAL);
 
-	swap_submit_usage (NULL, swap_used, swap_free, "cached", swap_cached);
+	swap_submit_usage (NULL, swap_used, swap_free,
+			isnan (swap_cached) ? NULL : "cached", swap_cached);
 	return (0);
 } /* }}} int swap_read_combined */