$NetBSD: patch-src_swap.c,v 1.2 2015/08/11 14:15:00 he Exp $

Extend support for NetBSD, and add per-swap-device
reporting for HAVE_SWAPCTL_THREE_ARGS.

--- src/swap.c.orig	2015-05-20 12:04:47.000000000 +0000
+++ src/swap.c
@@ -76,9 +76,12 @@ static _Bool report_bytes = 0;
 static _Bool report_by_device = 0;
 /* #endif KERNEL_LINUX */
 
-#elif HAVE_SWAPCTL && HAVE_SWAPCTL_TWO_ARGS
+#elif HAVE_SWAPCTL && (HAVE_SWAPCTL_TWO_ARGS || HAVE_SWAPCTL_THREE_ARGS)
 # define SWAP_HAVE_REPORT_BY_DEVICE 1
 static derive_t pagesize;
+#if KERNEL_NETBSD
+static _Bool report_bytes = 0;
+#endif
 static _Bool report_by_device = 0;
 /* #endif HAVE_SWAPCTL && HAVE_SWAPCTL_TWO_ARGS */
 
@@ -114,7 +117,7 @@ static int swap_config (oconfig_item_t *
 	{
 		oconfig_item_t *child = ci->children + i;
 		if (strcasecmp ("ReportBytes", child->key) == 0)
-#if KERNEL_LINUX
+#if KERNEL_LINUX || KERNEL_NETBSD
 			cf_util_get_boolean (child, &report_bytes);
 #else
 			WARNING ("swap plugin: The \"ReportBytes\" option "
@@ -147,7 +150,7 @@ static int swap_init (void) /* {{{ */
 	pagesize = (derive_t) sysconf (_SC_PAGESIZE);
 /* #endif KERNEL_LINUX */
 
-#elif HAVE_SWAPCTL && HAVE_SWAPCTL_TWO_ARGS
+#elif HAVE_SWAPCTL && (HAVE_SWAPCTL_TWO_ARGS || HAVE_SWAPCTL_THREE_ARGS)
 	/* getpagesize(3C) tells me this does not fail.. */
 	pagesize = (derive_t) getpagesize ();
 /* #endif HAVE_SWAPCTL */
@@ -213,7 +216,7 @@ static void swap_submit_usage (char cons
 				other_name, other_value, NULL);
 } /* }}} void swap_submit_usage */
 
-#if KERNEL_LINUX || HAVE_PERFSTAT
+#if KERNEL_LINUX || HAVE_PERFSTAT || KERNEL_NETBSD
 __attribute__((nonnull(1)))
 static void swap_submit_derive (char const *type_instance, /* {{{ */
 		derive_t value)
@@ -614,6 +617,43 @@ static int swap_read (void) /* {{{ */
 /* #endif HAVE_SWAPCTL && HAVE_SWAPCTL_TWO_ARGS */
 
 #elif HAVE_SWAPCTL && HAVE_SWAPCTL_THREE_ARGS
+#if KERNEL_NETBSD
+#include <uvm/uvm_extern.h>
+
+static int
+swap_read_io (void) /* {{{ */
+{
+	static int uvmexp_mib[] = { CTL_VM, VM_UVMEXP2 };
+	struct uvmexp_sysctl uvmexp;
+	size_t ssize;
+	derive_t swap_in, swap_out;
+
+	ssize = sizeof(uvmexp);
+	memset(&uvmexp, 0, ssize);
+	if (sysctl(uvmexp_mib, __arraycount(uvmexp_mib), &uvmexp,
+		&ssize, NULL, 0) == -1) {
+			char errbuf[1024];
+			WARNING ("swap: sysctl for uvmexp failed: %s",
+				sstrerror (errno, errbuf, sizeof (errbuf)));
+			return (-1);
+	}
+
+	swap_in  = uvmexp.pgswapin;
+	swap_out = uvmexp.pgswapout;
+
+	if (report_bytes)
+	{
+		swap_in = swap_in * pagesize;
+		swap_out = swap_out * pagesize;
+	}
+
+	swap_submit_derive ("in",  swap_in);
+	swap_submit_derive ("out", swap_out);
+
+	return (0);
+} /* }}} */
+#endif
+
 static int swap_read (void) /* {{{ */
 {
 	struct swapent *swap_entries;
@@ -660,23 +700,53 @@ static int swap_read (void) /* {{{ */
 	 * swap_entries[i].se_path */
 	for (i = 0; i < swap_num; i++)
 	{
+		char path[PATH_MAX];
+		gauge_t this_used;
+		gauge_t this_total;
+		
 		if ((swap_entries[i].se_flags & SWF_ENABLE) == 0)
 			continue;
 
-		used  += ((gauge_t) swap_entries[i].se_inuse) * C_SWAP_BLOCK_SIZE;
-		total += ((gauge_t) swap_entries[i].se_nblks) * C_SWAP_BLOCK_SIZE;
-	}
+		this_used = ((gauge_t) swap_entries[i].se_inuse)
+			* C_SWAP_BLOCK_SIZE;
+		this_total = ((gauge_t) swap_entries[i].se_nblks)
+			* C_SWAP_BLOCK_SIZE;
+		
+		
+		/* Shortcut for the "combined" setting (default) */
+		if (!report_by_device)
+		{
+			used  += this_used;
+			total += this_total;
+			continue;
+		}
+
+		sstrncpy (path, swap_entries[i].se_path, sizeof (path));
+		escape_slashes (path, sizeof (path));
+
+		swap_submit_usage (path, this_used, this_total - this_used,
+				   NULL, NAN);
+	} /* for (swap_num) */
+
 
 	if (total < used)
 	{
 		ERROR ("swap plugin: Total swap space (%g) is less than used swap space (%g).",
 				total, used);
+		sfree (swap_entries);
 		return (-1);
 	}
 
-	swap_submit_usage (NULL, used, total - used, NULL, NAN);
+	/* If the "separate" option was specified (report_by_device == 1), all
+	 * values have already been dispatched from within the loop. */
+	if (!report_by_device)
+		swap_submit_usage (NULL, used, total - used, NULL, NAN);
 
 	sfree (swap_entries);
+
+#if KERNEL_NETBSD
+	swap_read_io ();
+#endif
 	return (0);
 } /* }}} int swap_read */
 /* #endif HAVE_SWAPCTL && HAVE_SWAPCTL_THREE_ARGS */