Swap usage on darwin from sysctl vm.swapusage (#1608)

Signed-off-by: jonas <jonas.lindmark@denacode.se>

1 files changed, 12 insertions, 0 deletions

diff --git a/collector/meminfo_darwin.go b/collector/meminfo_darwin.go
index 5ca9004..87f3e5a 100644
--- a/collector/meminfo_darwin.go
+++ b/collector/meminfo_darwin.go
@@ -16,6 +16,8 @@
 package collector
 
 // #include <mach/mach_host.h>
+// #include <sys/sysctl.h>
+// typedef struct xsw_usage xsw_usage_t;
 import "C"
 
 import (
@@ -43,6 +45,13 @@ func (c *meminfoCollector) getMemInfo() (map[string]float64, error) {
         if err != nil {
                 return nil, err
         }
+
+        swapraw, err := unix.SysctlRaw("vm.swapusage")
+        if err != nil {
+                return nil, err
+        }
+        swap := (*C.xsw_usage_t)(unsafe.Pointer(&swapraw[0]))
+
         // Syscall removes terminating NUL which we need to cast to uint64
         total := binary.LittleEndian.Uint64([]byte(totalb + "\x00"))
 
@@ -59,5 +68,8 @@ func (c *meminfoCollector) getMemInfo() (map[string]float64, error) {
                 "swapped_in_bytes_total":  ps * float64(vmstat.pageins),
                 "swapped_out_bytes_total": ps * float64(vmstat.pageouts),
                 "total_bytes":             float64(total),
+                "swap_used_bytes":         float64(swap.xsu_used),
+                "swap_free_bytes":         float64(swap.xsu_avail),
+                "swap_total_bytes":        float64(swap.xsu_total),
         }, nil
 }